Celestial Treasury

Science.gov (United States)

Lachièze-Rey, Marc; Luminet, Jean-Pierre

2001-07-01

Throughout history, the mysterious dark skies have inspired our imaginations in countless ways, influencing our endeavors in science and philosophy, religion, literature, and art. Filled with 380 full-color illustrations, Celestial Treasury shows the influence of astronomical theories and the richness of illustrations in Western civilization through the ages. The authors explore the evolution of our understanding of astronomy and weave together ancient and modern theories in a fascinating narrative. They incorporate a wealth of detail from Greek verse, medieval manuscripts and Victorian poetry with contemporary spacecraft photographs and computer-generated star charts. Celestial Treasury is more than a beautiful book: it answers a variety of questions that have intrigued scientists and laymen for centuries. -- How did philosophers and scientists try to explain the order that governs celestial motion? -- How did geometers and artists measure and map the skies? -- How many different answers have been proposed for the most fundamental of all questions: When and how did Earth come about? -- Who inhabits the heavens--gods, angels or extraterrestrials? No other book recounts humankind's fascination with the heavens as compellingly as Celestial Treasury. Marc Lachièze-Rey is a director of research at the Centre National pour la Récherche Scientifique and astrophysicist at the Centre d'Etudes de Saclay. He is the author of The Cosmic Background Radiation (Cambridge, 1999), and and The Quest for Unity, (Oxford, 1999 ), as well as many books in French. Jean-Pierre Luminet is a research director of the Centre National pour la Rechérche Scientifique, based at the Paris-Meudon observatory. He is the author of Black Holes, (Cambridge 1992), as well as science documentaries for television.

Influence of celestial parameters on Mercury's perihelion shift

Czech Academy of Sciences Publication Activity Database

Křížek, Michal

2017-01-01

Roč. 27, June (2017), s. 41-56 ISSN 1313-2709 Institutional support: RVO:67985840 Keywords : solar system * ephemeris * line of apsides Subject RIV: BN - Astronomy, Celestial Mechanics , Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) http://www.astro.bas.bg/AIJ/issues/n27/MKrizek.pdf

Influence of celestial parameters on Mercury's perihelion shift

Czech Academy of Sciences Publication Activity Database

Křížek, Michal

2017-01-01

Roč. 27, June (2017), s. 41-56 ISSN 1313-2709 Institutional support: RVO:67985840 Keywords : solar system * ephemeris * line of apsides Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) http://www.astro.bas.bg/AIJ/issues/n27/MKrizek.pdf

Observation of Celestial Phenomena in Ancient China

Science.gov (United States)

Sun, Xiaochun

Because of the need for calendar-making and portent astrology, the Chinese were diligent and meticulous observers of celestial phenomena. China has maintained the longest continuous historical records of celestial phenomena in the world. Extraordinary or abnormal celestial events were particularly noted because of their astrological significance. The historical records cover various types of celestial phenomena, which include solar and lunar eclipses, sunspots, "guest stars" (novae or supernovae as we understand today), comets and meteors, and all kinds of planetary phenomena. These records provide valuable historical data for astronomical studies today.

Generation of dynamo waves by spatially separated sources in the Earth and other celestial bodies

Science.gov (United States)

Popova, E.

2017-12-01

The amplitude and the spatial configuration of the planetary and stellar magnetic field can changing over the years. Celestial bodies can have cyclic, chaotic or unchanging in time magnetic activity which is connected with a dynamo mechanism. This mechanism is based on the consideration of the joint influence of the alpha-effect and differential rotation. Dynamo sources can be located at different depths (active layers) of the celestial body and can have different intensities. Application of this concept allows us to get different forms of solutions and some of which can include wave propagating inside the celestial body. We analytically showed that in the case of spatially separated sources of magnetic field each source generates a wave whose frequency depends on the physical parameters of its source. We estimated parameters of sources required for the generation nondecaying waves. We discus structure of such sources and matter motion (including meridional circulation) in the liquid outer core of the Earth and active layers of other celestial bodies.

Burnham's celestial handbook

CERN Document Server

Burnham, Robert

1978-01-01

Volume II of a comprehensive three-part guide to celestial objects outside our solar system ranges from Chamaeleon to Orion. Features coordinates, classifications, physical descriptions, hundreds of visual aids. 1977 edition.

Design of all-weather celestial navigation system

Science.gov (United States)

Sun, Hongchi; Mu, Rongjun; Du, Huajun; Wu, Peng

2018-03-01

In order to realize autonomous navigation in the atmosphere, an all-weather celestial navigation system is designed. The research of celestial navigation system include discrimination method of comentropy and the adaptive navigation algorithm based on the P value. The discrimination method of comentropy is studied to realize the independent switching of two celestial navigation modes, starlight and radio. Finally, an adaptive filtering algorithm based on P value is proposed, which can greatly improve the disturbance rejection capability of the system. The experimental results show that the accuracy of the three axis attitude is better than 10″, and it can work all weather. In perturbation environment, the position accuracy of the integrated navigation system can be increased 20% comparing with the traditional method. It basically meets the requirements of the all-weather celestial navigation system, and it has the ability of stability, reliability, high accuracy and strong anti-interference.

Burnham's celestial handbook

CERN Document Server

Burnham, Robert

1978-01-01

Volume I of this comprehensive three-part guide to the thousands of celestial objects outside our solar system ranges from Andromeda through Cetus. Objects are grouped according to constellation, and their definitions feature names, coordinates, classifications, and physical descriptions. Additional notes offer fascinating historical information. Hundreds of visual aids. 1977 edition.

AstrodyToolsWeb an e-Science project in Astrodynamics and Celestial Mechanics fields

Science.gov (United States)

López, R.; San-Juan, J. F.

2013-05-01

Astrodynamics Web Tools, AstrodyToolsWeb (http://tastrody.unirioja.es), is an ongoing collaborative Web Tools computing infrastructure project which has been specially designed to support scientific computation. AstrodyToolsWeb provides project collaborators with all the technical and human facilities in order to wrap, manage, and use specialized noncommercial software tools in Astrodynamics and Celestial Mechanics fields, with the aim of optimizing the use of resources, both human and material. However, this project is open to collaboration from the whole scientific community in order to create a library of useful tools and their corresponding theoretical backgrounds. AstrodyToolsWeb offers a user-friendly web interface in order to choose applications, introduce data, and select appropriate constraints in an intuitive and easy way for the user. After that, the application is executed in real time, whenever possible; then the critical information about program behavior (errors and logs) and output, including the postprocessing and interpretation of its results (graphical representation of data, statistical analysis or whatever manipulation therein), are shown via the same web interface or can be downloaded to the user's computer.

Burnham's celestial handbook

CERN Document Server

Burnham, Robert

1978-01-01

Volume III of this three-part comprehensive guide to the thousands of celestial objects outside our solar system concludes with listings from Pavo through Vulpecula. Objects are grouped according to constellation, and their definitions feature names, coordinates, classifications, and physical descriptions. Additional notes offer fascinating historical information. Hundreds of visual aids. 1977 edition.

The celestial mechanics approach: application to data of the GRACE mission

Science.gov (United States)

Beutler, Gerhard; Jäggi, Adrian; Mervart, Leoš; Meyer, Ulrich

2010-11-01

The celestial mechanics approach (CMA) has its roots in the Bernese GPS software and was extensively used for determining the orbits of high-orbiting satellites. The CMA was extended to determine the orbits of Low Earth Orbiting satellites (LEOs) equipped with GPS receivers and of constellations of LEOs equipped in addition with inter-satellite links. In recent years the CMA was further developed and used for gravity field determination. The CMA was developed by the Astronomical Institute of the University of Bern (AIUB). The CMA is presented from the theoretical perspective in (Beutler et al. 2010). The key elements of the CMA are illustrated here using data from 50 days of GPS, K-Band, and accelerometer observations gathered by the Gravity Recovery And Climate Experiment (GRACE) mission in 2007. We study in particular the impact of (1) analyzing different observables [Global Positioning System (GPS) observations only, inter-satellite measurements only], (2) analyzing a combination of observations of different types on the level of the normal equation systems (NEQs), (3) using accelerometer data, (4) different orbit parametrizations (short-arc, reduced-dynamic) by imposing different constraints on the stochastic orbit parameters, and (5) using either the inter-satellite ranges or their time derivatives. The so-called GRACE baseline, i.e., the achievable accuracy of the GRACE gravity field for a particular solution strategy, is established for the CMA.

Celestial Navigation on the Surface of Mars

Science.gov (United States)

Malay, Benjamin P.

2001-05-01

A simple, accurate, and autonomous method of finding position on the surface of Mars currently does not exist. The goal of this project is to develop a celestial navigation process that will fix a position on Mars with 100-meter accuracy. This method requires knowing the position of the stars and planets referenced to the Martian surface with one arcsecond accuracy. This information is contained in an ephemeris known as the Aeronautical Almanac (from Ares, the god of war) . Naval Observatory Vector Astrometry Subroutines (NOVAS) form the basis of the code used to generate the almanac. Planetary position data come the JPL DE405 Planetary Ephemeris. The theoretical accuracy of the almanac is determined mathematically and compared with the Ephemeris for Physical Observations of Mars contained in the Astronautical Almanac. A preliminary design of an autonomous celestial navigation system is presented. Recommendations of how to integrate celestial navigation into NASA=s current Mars exploration program are also discussed. This project is a useful and much-needed first step towards establishing celestial navigation as a practical way to find position on the surface of Mars.

Connecting VLBI and Gaia celestial reference frames

Directory of Open Access Journals (Sweden)

Zinovy Malkin

2016-09-01

Full Text Available The current state of the link problem between radio and optical celestial reference frames is considered.The main objectives of the investigations in this direction during the next few years are the preparation of a comparisonand the mutual orientation and rotation between the optical it Gaia Celestial Reference Frame (GCRFand the 3rd generation radio International Celestial Reference Frame (ICRF3, obtained from VLBI observations.Both systems, ideally, should be a realization of the ICRS (International Celestial Reference System at micro-arcsecond level accuracy.Therefore, the link accuracy between the ICRF and GCRF should be obtained with similar error level, which is not a trivial taskdue to relatively large systematic and random errors in source positions at different frequency bands.In this paper, a brief overview of recent work on the GCRF--ICRF link is presented.Additional possibilities to improve the GCRF--ICRF link accuracy are discussed.The suggestion is made to use astrometric radio sources with optical magnitude to 20$^m$ rather than to 18$^m$ as currently plannedfor the GCRF--ICRF link.In addition, the use of radio stars is also a prospective method to obtain independent and accurate orientation between the Gaia frame and the ICRF.

Connecting VLBI and Gaia Celestial Reference Frames

Energy Technology Data Exchange (ETDEWEB)

Malkin, Zinovy, E-mail: malkin@gao.spb.ru [Department of Radio Astronomy Research, The Pulkovo Astronomical Observatory, St. Petersburg (Russian Federation); Institute of Earth Sciences, St. Petersburg State University, St. Petersburg (Russian Federation); Astronomy and Cosmic Geodesy Department, Kazan Federal University, Kazan (Russian Federation)

2016-09-12

The current state of the link problem between radio and optical celestial reference frames is considered. The main objectives of the investigations in this direction during the next few years are the preparation of a comparison and the mutual orientation and rotation between the optical Gaia Celestial Reference Frame (GCRF) and the 3rd generation radio International Celestial Reference Frame (ICRF3), obtained from VLBI observations. Both systems, ideally, should be a realization of the ICRS (International Celestial Reference System) at micro-arcsecond level accuracy. Therefore, the link accuracy between the ICRF and GCRF should be obtained with similar error level, which is not a trivial task due to relatively large systematic and random errors in source positions at different frequency bands. In this paper, a brief overview of recent work on the GCRF–ICRF link is presented. Additional possibilities to improve the GCRF–ICRF link accuracy are discussed. The suggestion is made to use astrometric radio sources with optical magnitude to 20{sup m} rather than to 18{sup m} as currently planned for the GCRF–ICRF link. In addition, the use of radio stars is also a prospective method to obtain independent and accurate orientation between the Gaia frame and the ICRF.

The limit passage of space curvature in problems of celestial mechanics with the generalized Kepler and Hooke potentials

Science.gov (United States)

Vozmishcheva, Tatiana

2016-09-01

The connection between the problems of celestial mechanics: the Kepler problem, the two-center problem and the two body problem in spaces of constant curvature with the generalized Kepler and Hooke potentials is investigated. The limit passage in the two-center and two body problems in the Lobachevsky space and on a sphere is carried out as λto0 (λ is the curvature of the corresponding space) for the two potentials. The potentials and metrics in spaces under study are written in the gnomonic coordinates. It is shown that as the curvature radius tends to infinity, the generalized gravitational and elastic potentials transform to the Kepler and Hooke forms in the Euclidean space.

The Celestial Vault: The Magic of Astrology

Science.gov (United States)

McGaha, J.

2004-11-01

Astrology is a "Geocentric System" that supports the "Astrological Principle". This principle, that human beings and their actions are influenced by the positions of celestial objects, is not objectively supported. The "planetary gods" found in the heavens provided order to help explain the chaotic events in life on earth. Is this why many people think their horoscopes are correct, with the "stars" taking credit? Do "celestial movements" foretell the future? What is the evidence for Astrology? The historical, psychological and physical foundations of astrology will be discussed.

Archaic artifacts resembling celestial spheres

Science.gov (United States)

Dimitrakoudis, S.; Papaspyrou, P.; Petoussis, V.; Moussas, X.

We present several bronze artifacts from the Archaic Age in Greece (750-480 BC) that resemble celestial spheres or forms of other astronomical significance. They are studied in the context of the Dark Age transition from Mycenaean Age astronomical themes to the philosophical and practical revival of astronomy in the Classical Age with its plethora of astronomical devices. These artifacts, mostly votive in nature are spherical in shape and appear in a variety of forms their most striking characteristic being the depiction of meridians and/or an equator. Most of those artifacts come from Thessaly, and more specifically from the temple of Itonia Athena at Philia, a religious center of pan-Hellenic significance. Celestial spheres, similar in form to the small artifacts presented in this study, could be used to measure latitudes, or estimate the time at a known place, and were thus very useful in navigation.

Celestial Seasonings: Astronomy and Rock Art in the American Southwest

Science.gov (United States)

Krupp, E. C.

1994-12-01

Astronomical interpretations of prehistoric rock art have played a significant part in the development of modern archaeoastronomy since 1975, when interest was renewed in the possibility that the Crab supernova explosion of 1054 A.D. was represented in rock art of the American Southwest. (This hypothesis was actually first formulated in 1955.) In the last two decades, a variety of astronomical functions for rock art have been proposed and investigated. These include representation of specific historical celestial events, symbolic representation of elements of celestial myths, star maps, markers for astronomical observing stations markers for celestially tempered shrines, images intended to invoke and exploit cosmo-magical power, seasonally significant light-and-shadow displays. Examples of astronomical connotations in prehistoric rock art from the Southwest and California illustrate the necessity of understanding the culture in any attempt to understand its astronomy.

The Inner Meaning of Outer Space: Human Nature and the Celestial Realm

Directory of Open Access Journals (Sweden)

Timothy L. Hubbard

2008-06-01

Full Text Available Kant argued that humans possess a priori knowledge of space; although his argument focused on a physics of bodies, it also has implications for a psychology of beings. Many human cultures organize stars in the night sky into constellations (i.e., impose structure; attribute properties, behaviors, and abilities to objects in the celestial realm (i.e., impose meaning; and use perceived regularity in the celestial realms in development of calendars, long-range navigation, agriculture, and astrology (i.e., seek predictability and control. The physical inaccessibility of the celestial realm allows a potent source of metaphor, and also allows projection of myths regarding origin and ascension, places of power, and dwelling places of gods, immortals, and other souls. Developments in astronomy and cosmology infl uenced views of human nature and the place of humanity in the universe, and these changes parallel declines in egocentrism with human development. Views regarding alleged beings (e.g., angels, extraterrestrials from the celestial realm (and to how communicate with such beings are anthropocentric and ignore evolutionary factors in physical and cognitive development. It is suggested that in considering views and uses of the celestial realm, we learn not just about the universe, but also about ourselves. *

Line selection in celestial masers

International Nuclear Information System (INIS)

Middleton, M.S.

1978-09-01

The primary themes of this work concern the applicability of the Cook (1975) filter mechanism to line selection in hydroxyl masers, and the question of whether interstellar hydroxyl, water, and silicon monoxide masers are saturated. Whether the Cook filter is operative in celestial masers has not thus far been decided, even though it has been shown that such an effect might be occurring. The theory in its present form does not account for line broadening, nor have its consequences with regard to microwave maser emission from excited states of hydroxyl been explored. Both these topics are discussed and the findings are compared with the observations of NGC 6334A, a source which is interesting because of the strong evidence for Zeeman splitting which can be seen in some of its observed spectra. The question of whether interstellar masers are saturated has been much discussed, but a simple method for determining the state of saturation of observed masers does not exist. In particular, the importance of background radiation and of different cloud geometries on the state of saturation of interstellar masers up to now has not been fully appreciated. Both these topics are discussed. (author)

A celestial assisted INS initialization method for lunar explorers.

Science.gov (United States)

Ning, Xiaolin; Wang, Longhua; Wu, Weiren; Fang, Jiancheng

2011-01-01

The second and third phases of the Chinese Lunar Exploration Program (CLEP) are planning to achieve Moon landing, surface exploration and automated sample return. In these missions, the inertial navigation system (INS) and celestial navigation system (CNS) are two indispensable autonomous navigation systems which can compensate for limitations in the ground based navigation system. The accurate initialization of the INS and the precise calibration of the CNS are needed in order to achieve high navigation accuracy. Neither the INS nor the CNS can solve the above problems using the ground controllers or by themselves on the lunar surface. However, since they are complementary to each other, these problems can be solved by combining them together. A new celestial assisted INS initialization method is presented, in which the initial position and attitude of the explorer as well as the inertial sensors' biases are estimated by aiding the INS with celestial measurements. Furthermore, the systematic error of the CNS is also corrected by the help of INS measurements. Simulations show that the maximum error in position is 300 m and in attitude 40″, which demonstrates this method is a promising and attractive scheme for explorers on the lunar surface.

A Celestial Assisted INS Initialization Method for Lunar Explorers

Directory of Open Access Journals (Sweden)

Jiancheng Fang

2011-07-01

Full Text Available The second and third phases of the Chinese Lunar Exploration Program (CLEP are planning to achieve Moon landing, surface exploration and automated sample return. In these missions, the inertial navigation system (INS and celestial navigation system (CNS are two indispensable autonomous navigation systems which can compensate for limitations in the ground based navigation system. The accurate initialization of the INS and the precise calibration of the CNS are needed in order to achieve high navigation accuracy. Neither the INS nor the CNS can solve the above problems using the ground controllers or by themselves on the lunar surface. However, since they are complementary to each other, these problems can be solved by combining them together. A new celestial assisted INS initialization method is presented, in which the initial position and attitude of the explorer as well as the inertial sensors’ biases are estimated by aiding the INS with celestial measurements. Furthermore, the systematic error of the CNS is also corrected by the help of INS measurements. Simulations show that the maximum error in position is 300 m and in attitude 40″, which demonstrates this method is a promising and attractive scheme for explorers on the lunar surface.

Urgensi Penerapan Celestial Management Bagi Sumber Daya Manusia Di Bank Syariah

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Trimulato Trimulato

2016-05-01

Full Text Available Abstract: Islamic banking currently has a strong legal law with the presence of the law number 21 of 2008 on banking syari'ah.Hal This adversely affects the existence of the banking Shari'ah are increasingly in demand by many. Islamic bank continues to grow and continue to open office services in various areas. Thus iru development of Islamic banks must be matched with adequate resources and qualified. Noted labor in Islamic banks continued to grow, from November 2014 to November 2015 grew to 23.51%. Not only the quantity but the quality should also be considered, it takes a celestial concept should be applied for the Management of human resources in Islamic banks. This paper uses a descriptive qualitative limitations in this paper is focused on the human resources that exist in the Islamic bank. The need for the application of celestial management for human resources in the bank syariahi. The results of this paper that the human resources in Islamic banks is growing, then the need for the application of celestial management for human resources in Islamic banks to create good quality. Because the Islamic bank is an institution whose business is inseparable from the rule of religion or spiritual aspect. Abstrak: Perbankan syari’ah saat ini telah memiliki payung hukum yang kuat dengan hadirnya undang-undang nomor 21 tahun 2008 tentang perbankan syari’ah.Hal ini sangat berpengaruh terhadap eksistensi dari perbankan syari’ah yang semakin diminati oleh banyak kalangan. Bank syari’ah terus berkembang dan terus membuka layanan kantor di berbagai daerah. Maka dari iru perkembangan bank syariah harus diimbangi dengan sumber daya yang mencukupi dan berkualitas. Tercatat tenaga kerja di bank syariah terus bertambah, dari November 2014 sampai November 2015 mengalami pertumbuhan hingga 23,51%. Tidak hanya dari kuantitas tapi kualitas juga harus diperhatikan, dibutuhkan sebuah konsep celestial manajement yang harus diterapkan bagi sumber daya manusia

Monthly gravity field solutions based on GRACE observations generated with the Celestial Mechanics Approach

Science.gov (United States)

Meyer, Ulrich; Jäggi, Adrian; Beutler, Gerhard

2012-09-01

The main objective of the Gravity Recovery And Climate Experiment (GRACE) satellite mission consists of determining the temporal variations of the Earth's gravity field. These variations are captured by time series of gravity field models of limited resolution at, e.g., monthly intervals. We present a new time series of monthly models, which was computed with the so-called Celestial Mechanics Approach (CMA), developed at the Astronomical Institute of the University of Bern (AIUB). The secular and seasonal variations in the monthly models are tested for statistical significance. Calibrated errors are derived from inter-annual variations. The time-variable signal can be extracted at least up to degree 60, but the gravity field coefficients of orders above 45 are heavily contaminated by noise. This is why a series of monthly models is computed up to a maximum degree of 60, but only a maximum order of 45. Spectral analysis of the residual time-variable signal shows a distinctive peak at a period of 160 days, which shows up in particular in the C20 spherical harmonic coefficient. Basic filter- and scaling-techniques are introduced to evaluate the monthly models. For this purpose, the variability over the oceans is investigated, which serves as a measure for the noisiness of the models. The models in selected regions show the expected seasonal and secular variations, which are in good agreement with the monthly models of the Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ). The results also reveal a few small outliers, illustrating the necessity for improved data screening. Our monthly models are available at the web page of the International Centre for Global Earth Models (ICGEM).

The Future of Past Skies: Historical Celestial Cartography at the Adler Planetarium

Science.gov (United States)

Raposo, Pedro M. P.

2018-01-01

The Adler Planetarium is home to a world-class collection of scientific instruments, rare books and works on paper. Since 2014, Adler staff has been digitizing a wide selection of items relating to celestial cartography, including: more than 236 rare books and atlases; 97 works on paper; globes and other artifacts, amounting to 58 objects; and approximately 3,750 Carte du Ciel prints. This work has been carried out under the auspices of the Celestial Cartography Digitization Project (CCDP), which is sponsored by the National Endowment for the Humanities. This poster presentation will include: 1) an update on the project; 2) a description of related resources and tools available to the research community; 3) examples of how the Adler Planetarium is integrating the history of celestial cartography with its public programs; 4) an overview of a prospective citizen science project involving the identification of constellations in historical atlases and charts.

Celestial Pole Offsets: Conversion From (dX, dY) to (d(psi), d(epsilon). Version 3

National Research Council Canada - National Science Library

Kaplan, George H

2005-01-01

...; defined more precisely what is meant by the celestial pole; and provided a new definition of UT1 in terms of an angle that directly measures the rotation of Earth in the celestial reference system...

Center of Mass of Two or More Celestial Bodies as a Basis of Comets and «Black Holes» Mechanism

Directory of Open Access Journals (Sweden)

Eugeny F. Orlov

2012-04-01

Full Text Available The article considers the questions, arising during rendezvous of two celestial bodies with equal mass, one of which is the Earth and the consequences of such rendezvous to modern civilization, suggests the idea of centers of galaxies mass with anomalously large values of the gravitational fields, which allows to divide them into two types – material filled and hollow.

Polarization Patterns of Transmitted Celestial Light under Wavy Water Surfaces

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Guanhua Zhou

2017-03-01

Full Text Available This paper presents a model to describe the polarization patterns of celestial light, which includes sunlight and skylight, when refracted by wavy water surfaces. The polarization patterns and intensity distribution of refracted light through the wave water surface were calculated. The model was validated by underwater experimental measurements. The experimental and theoretical values agree well qualitatively. This work provides a quantitative description of the repolarization and transmittance of celestial light transmitted through wave water surfaces. The effects of wind speed and incident sources on the underwater refraction polarization patterns are discussed. Scattering skylight dominates the polarization patterns while direct solar light is the dominant source of the intensity of the underwater light field. Wind speed has an influence on disturbing the patterns under water.

A Comparison of the Dynamical Evolution of Planetary Systems Proceedings of the Sixth Alexander von Humboldt Colloquium on Celestial Mechanics Bad Hofgastein (Austria), 21–27 March 2004

CERN Document Server

Dvorak, Rudolf

2005-01-01

The papers in this volume cover a wide range of subjects covering the most recent developments in Celestial Mechanics from the theoretical point of nonlinear dynamical systems to the application to real problems. We emphasize the papers on the formation of planetary systems, their stability and also the problem of habitable zones in extrasolar planetary systems. A special topic is the stability of Trojans in our planetary system, where more and more realistic dynamical models are used to explain their complex motions: besides the important contribution from the theoretical point of view, the results of several numerical experiments unraveled the structure of the stable zone around the librations points. This volume will be of interest to astronomers and mathematicians interested in Hamiltonian mechanics and in the dynamics of planetary systems.

UBVRI PHOTOMETRIC STANDARD STARS AROUND THE CELESTIAL EQUATOR: UPDATES AND ADDITIONS

International Nuclear Information System (INIS)

Landolt, Arlo U.

2009-01-01

New broadband UBVRI photoelectric observations on the Johnson-Kron-Cousins photometric system have been made of 202 stars around the sky, and centered at the celestial equator. These stars constitute both an update of and additions to a previously published list of equatorial photometric standard stars. The list is capable of providing, for both celestial hemispheres, an internally consistent homogeneous broadband standard photometric system around the sky. When these new measurements are included with those previously published by Landolt (1992), the entire list of standard stars in this paper encompasses the magnitude range 8.90 < V < 16.30, and the color index range -0.35 < (B - V) < +2.30.

Hubble peers inside a celestial geode

Science.gov (United States)

2004-08-01

celestial geode hi-res Size hi-res: 148 Kb Credits: ESA/NASA, Yäel Nazé (University of Liège, Belgium) and You-Hua Chu (University of Illinois, Urbana, USA) Hubble peers inside a celestial geode In this unusual image, the NASA/ESA Hubble Space Telescope captures a rare view of the celestial equivalent of a geode - a gas cavity carved by the stellar wind and intense ultraviolet radiation from a young hot star. Real geodes are handball-sized, hollow rocks that start out as bubbles in volcanic or sedimentary rock. Only when these inconspicuous round rocks are split in half by a geologist, do we get a chance to appreciate the inside of the rock cavity that is lined with crystals. In the case of Hubble's 35 light-year diameter ‘celestial geode’ the transparency of its bubble-like cavity of interstellar gas and dust reveals the treasures of its interior. Low resolution version (JPG format) 148 Kb High resolution version (TIFF format) 1929 Kb Acknowledgment: This image was created with the help of the ESA/ESO/NASA Photoshop FITS Liberator. Real geodes are handball-sized, hollow rocks that start out as bubbles in volcanic or sedimentary rock. Only when these inconspicuous round rocks are split in half by a geologist, do we get a chance to appreciate the inside of the rock cavity that is lined with crystals. In the case of Hubble's 35 light-year diameter ‘celestial geode’ the transparency of its bubble-like cavity of interstellar gas and dust reveals the treasures of its interior. The object, called N44F, is being inflated by a torrent of fast-moving particles (what astronomers call a 'stellar wind') from an exceptionally hot star (the bright star just below the centre of the bubble) once buried inside a cold dense cloud. Compared with our Sun (which is losing mass through the so-called 'solar wind'), the central star in N44F is ejecting more than a 100 million times more mass per second and the hurricane of particles moves much faster at 7 million km per hour

Mechanisms of Earth activity forsed by external celestial bodies:energy budjet and nature of cyclicity

Science.gov (United States)

Barkin, Yu. V.; Ferrandiz, J. M.

2003-04-01

In given report we discuss tidal and non-tidal mechanisms of forced tectonic (endogenous) activity of the Earth caused by gravitational attraction of the Moon, Sun and the planets. On the base of the classical solution of the problem of elasticity for model of the Earth with concentric mass distribution the evaluations of the tidal energy and power of Earth lunar-solar deformations, including their joint effect, were obtained. Important role of the joint energetic effect of rotational deformation of the Earth with lunar and solar tides was illustrated. Gravitational interaction of the Moon and Sun with non-spherical, non-homogeneous shells of the Earth generates big additional mechanical forces and moments of the interaction of the neighboring shells (rigid core, liquid core, mantle, lithosphere and separate plates). Acting of these forces and moments in the different time scales on the corresponding sells generates cyclic perturbations of the tensional state of the shells, their deformations, small relative translational displacements and small relative rotational oscillations of the shells. In geological period of time it leads to a fundamental tectonic reconstruction of the Earth. These additional forces and moments of the cyclic celestial-mechanical nature produce cyclic deformations of the all layers of the body and organize and control practically all natural processes. The additional force between mantle and core is cyclic and characterized by the wide basis of frequencies typical for orbital motions (of the Sun, Moon and planets), for rotational motion of the Earth, Moon and Sun and for many from observed natural processes. The problem about small relative translatory-rotary motion of the two shells separated by the thin viscous-elastic layer is studied. The differential equations of motion were obtained and have been studied in particular cases (plane motion of system; case of two axisymmetrical interacting shells and oth.) by approximate methods of small

The IAA Cosmic Study 'Protecting the Environment of Celestial Bodies'

Science.gov (United States)

Rettberg, Petra; Hofmann, Mahulena; Williamson, Mark

The study group tasked with producing this International Academy of Astronautics (IAA) `Cosmic Study' on Protecting the Environment of Celestial Bodies was formed under the aus-pices of IAA Commission V (Space Policy, Law Economy). The members of the international, multidisciplinary team assembled to undertake the Study accept, as a premise, the Planetary Protection Policy guidelines developed by COSPAR, which differentiate the degree of protec-tion according to the type of space activity and the celestial body under investigation (such that fly-by missions have less stringent requirements than lander missions, while Mars is `better protected' than the Moon). However, this Study goes deliberately beyond the interpretation of `Planetary Protection' as a set of methods for protecting the planets from biological con-tamination and extends consideration to the geophysical, industrial and cultural realms. The Study concludes that, from the perspective of current and future activities in outer space, present measures aimed at protecting the space environment are insufficient. Deficiencies in-clude a lack of suitable in-situ methods of chemical and biological detection and the absence of a systematic record of radioactive contaminants. Other issues identified by the Study include an insufficient legal framework, a shortage of effective economic tools and a lack of political will to address these concerns. It is expected that new detection methods under development, and the resultant increase in microbiological knowledge of the planetary surfaces, will lead to changes in the COSPAR planetary protection guidelines and bioburden limits. It is important, however, that any new approaches should not hamper future exploration and exploitation of celestial bodies more than absolutely necessary. The Study addresses the need to find a balance between protection and freedom of action. From a legal perspective, the Study concludes that a general consensus on protection of the

[The celestial phenomena in A. Dürer's engraving Melancholia I].

Science.gov (United States)

Weitzel, Hans

2009-01-01

The celestial body of Dürer's engraving Melencolia I is connected with his painting of a meteor, the Raveningham-painting; it is shown that the origin of this painting owns to the impact of the meteor of Ensisheim in 1492. Until now the celestial body, the balance, and the magic square are nearly consistently interpreted as the planet Saturn, the zodiac sign Libra, and the planet Jupiter, and the melancholy woman is subject to these heavenly bodies. Consequently, neoplatonic astrology has been the main focus of the engraving; including the rainbow, the engraving has also been interpreted biblically. The present paper, however, places emphasis on problems of the geometry as the reason of melancholy. Any astronomical meaning of the configuration of the numbers of the magic square is discarded.

Risk of Adverse Health and Performance Effects of Celestial Dust Exposure

Science.gov (United States)

Scully, Robert R.; Meyers, Valerie E.

2015-01-01

Crew members can be directly exposed to celestial dust in several ways. After crew members perform extravehicular activities (EVAs), they may introduce into the habitat dust that will have collected on spacesuits and boots. Cleaning of the suits between EVAs and changing of the Environmental Control Life Support System filters are other operations that could result in direct exposure to celestial dusts. In addition, if the spacesuits used in exploration missions abrade the skin, as current EVA suits have, then contact with these wounds would provide a source of exposure. Further, if celestial dusts gain access to a suit's interior, as was the case during the Apollo missions, the dust could serve as an additional source of abrasions or enhance suit-induced injuries. When a crew leaves the surface of a celestial body and returns to microgravity, the dust that is introduced into the return vehicle will "float," thus increasing the opportunity for ocular and respiratory injury. Because the features of the respirable fraction of lunar dusts indicate they could be toxic to humans, NASA conducted several studies utilizing lunar dust simulants and authentic lunar dust to determine the unique properties of lunar dust that affect physiology, assess the dermal and ocular irritancy of the dust, and establish a permissible exposure limit for episodic exposure to airborne lunar dust during missions that would involve no more than 6 months stay on the lunar surface. Studies, with authentic lunar soils from both highland (Apollo 16) and mare (Apollo17) regions demonstrated that the lunar soil is highly abrasive to a high fidelity model of human skin. Studies of lunar dust returned during the Apollo 14 mission from an area of the moon in which the soils were comprised of mineral constituents from both major geological regions (highlands and mares regions) demonstrated only minimal ocular irritancy, and pulmonary toxicity that was less than the highly toxic terrestrial crystalline

Intrinsic nonlinearity and method of disturbed observations in inverse problems of celestial mechanics

Science.gov (United States)

Avdyushev, Victor A.

2017-12-01

Orbit determination from a small sample of observations over a very short observed orbital arc is a strongly nonlinear inverse problem. In such problems an evaluation of orbital uncertainty due to random observation errors is greatly complicated, since linear estimations conventionally used are no longer acceptable for describing the uncertainty even as a rough approximation. Nevertheless, if an inverse problem is weakly intrinsically nonlinear, then one can resort to the so-called method of disturbed observations (aka observational Monte Carlo). Previously, we showed that the weaker the intrinsic nonlinearity, the more efficient the method, i.e. the more accurate it enables one to simulate stochastically the orbital uncertainty, while it is strictly exact only when the problem is intrinsically linear. However, as we ascertained experimentally, its efficiency was found to be higher than that of other stochastic methods widely applied in practice. In the present paper we investigate the intrinsic nonlinearity in complicated inverse problems of Celestial Mechanics when orbits are determined from little informative samples of observations, which typically occurs for recently discovered asteroids. To inquire into the question, we introduce an index of intrinsic nonlinearity. In asteroid problems it evinces that the intrinsic nonlinearity can be strong enough to affect appreciably probabilistic estimates, especially at the very short observed orbital arcs that the asteroids travel on for about a hundredth of their orbital periods and less. As it is known from regression analysis, the source of intrinsic nonlinearity is the nonflatness of the estimation subspace specified by a dynamical model in the observation space. Our numerical results indicate that when determining asteroid orbits it is actually very slight. However, in the parametric space the effect of intrinsic nonlinearity is exaggerated mainly by the ill-conditioning of the inverse problem. Even so, as for the

OPTICAL SPECTRA OF CANDIDATE INTERNATIONAL CELESTIAL REFERENCE FRAME (ICRF) FLAT-SPECTRUM RADIO SOURCES

Energy Technology Data Exchange (ETDEWEB)

Titov, O.; Stanford, Laura M. [Geoscience Australia, P.O. Box 378, Canberra, ACT 2601 (Australia); Johnston, Helen M.; Hunstead, Richard W. [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia); Pursimo, T. [Nordic Optical Telescope, Nordic Optical Telescope Apartado 474E-38700 Santa Cruz de La Palma, Santa Cruz de Tenerife (Spain); Jauncey, David L. [CSIRO Astronomy and Space Science, ATNF and Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia); Maslennikov, K. [Central Astronomical Observatory at Pulkovo, Pulkovskoye Shosse, 65/1, 196140, St. Petersburg (Russian Federation); Boldycheva, A., E-mail: oleg.titov@ga.gov.au [Ioffe Physical Technical Institute, 26 Polytekhnicheskaya, St. Petersburg, 194021 (Russian Federation)

2013-07-01

Continuing our program of spectroscopic observations of International Celestial Reference Frame (ICRF) sources, we present redshifts for 120 quasars and radio galaxies. Data were obtained with five telescopes: the 3.58 m European Southern Observatory New Technology Telescope, the two 8.2 m Gemini telescopes, the 2.5 m Nordic Optical Telescope (NOT), and the 6.0 m Big Azimuthal Telescope of the Special Astrophysical Observatory in Russia. The targets were selected from the International VLBI Service for Geodesy and Astrometry candidate International Celestial Reference Catalog which forms part of an observational very long baseline interferometry (VLBI) program to strengthen the celestial reference frame. We obtained spectra of the potential optical counterparts of more than 150 compact flat-spectrum radio sources, and measured redshifts of 120 emission-line objects, together with 19 BL Lac objects. These identifications add significantly to the precise radio-optical frame tie to be undertaken by Gaia, due to be launched in 2013, and to the existing data available for analyzing source proper motions over the celestial sphere. We show that the distribution of redshifts for ICRF sources is consistent with the much larger sample drawn from Faint Images of the Radio Sky at Twenty cm (FIRST) and Sloan Digital Sky Survey, implying that the ultra-compact VLBI sources are not distinguished from the overall radio-loud quasar population. In addition, we obtained NOT spectra for five radio sources from the FIRST and NRAO VLA Sky Survey catalogs, selected on the basis of their red colors, which yielded three quasars with z > 4.

Tree-level gluon amplitudes on the celestial sphere

Science.gov (United States)

Schreiber, Anders Ø.; Volovich, Anastasia; Zlotnikov, Michael

2018-06-01

Pasterski, Shao and Strominger have recently proposed that massless scattering amplitudes can be mapped to correlators on the celestial sphere at infinity via a Mellin transform. We apply this prescription to arbitrary n-point tree-level gluon amplitudes. The Mellin transforms of MHV amplitudes are given by generalized hypergeometric functions on the Grassmannian Gr (4 , n), while generic non-MHV amplitudes are given by more complicated Gelfand A-hypergeometric functions.

Micro-arcsecond Celestial Reference Frames: definition and realization — Impact of the recent IAU Resolutions

International Nuclear Information System (INIS)

Capitaine, Nicole

2012-01-01

improvements in the fields of astrometry, celestial mechanics, geodynamics, geodesy, etc. Of special interest are the improvements in the model for variations in Earth's rotation, which, in turn, can provide better knowledge of the dynamics of the Earth's interior. These have also contributed to a significant improvement in the accuracy of the ephemerides of the solar system bodies as determined from modern measurements, with a large number of scientific applications. This paper recalls the main aspects of the recent IAU resolutions on reference systems as well as their consequences on the concepts, definitions, nomenclature and models that are suitable for the definition, realization and transformation of reference frames at a microarcsecond level.

The Power of Stars How Celestial Observations Have Shaped Civilization

CERN Document Server

Penprase, Bryan E

2011-01-01

What are some of the connections that bind us to the stars? How have these connections been established? And how have people all around the world and throughout time reacted to the night sky, the sun and moon, in their poetry, mythology, rituals, and temples? This book explores the influence of the sky on both ancient and modern civilization, by providing a clear overview of the many ways in which humans have used the stars as an ordering principle in their cultures, and which today still inspire us intellectually, emotionally, and spiritually. The book explores constellation lore from around the world, celestial alignments of monuments and temples, both from ancient and modern civilizations, and the role the sky has played in the cultures of the Greek, Egyptian, Babylonian, Native American, Chinese, Mayan, Aztec, and Inca. Models of the universe from each of these cultures are described clearly, and each culture’s explanation of the stars, planets, and other celestial objects are described. The roots of as...

Archaeoastronomy as a Tool for Understanding Celestial Phenomena

Science.gov (United States)

Koufos, S.; Chatzichristou, E.

2017-09-01

To key feature of the wise and Modern Man was, is and will be the observation of the sky. The acquisition of knowledge by observing the majesty of the sky and studying these phenomena (stars, planets, sun, moon, comets, asteroids, meteors, orbits, seasons, etc.). decisively influenced all human cultures. Therefore the research on the astronomical knowledge and their usefulness for each culture may reveal important anthropological data. With this scientific article the ARCHAEOASTRONOMY engaged in a global dimension. With common ground among even distant peoples. The purpose of the speech is both the externalization of ARCHAEOASTRONOMY secondly the education and students interested in astronomy in a simple manner and methodology as used by our ancestors in order to better understand the basic rules of the celestial dome. Applied methods with the participation of students from local schools and experiments in ancient monuments in Rhodes existed before with great success since the beginning of 2000 and continues today enriching the resources and people of all ages, the island where noted and considered the "father" astronomy of Hipparchus, the island where construction probably the "Antikythera mechanism"

The International Celestial Reference Frame (ICRF) and the Relationship Between Frames

Science.gov (United States)

Ma, Chopo

2000-01-01

The International Celestial Reference Frame (ICRF), a catalog of VLBI source positions, is now the basis for astrometry and geodesy. Its construction and extension/maintenance will be discussed as well as the relationship of the ICRF, ITRF, and EOP/nutation.

Infrared radiation scene generation of stars and planets in celestial background

Science.gov (United States)

Guo, Feng; Hong, Yaohui; Xu, Xiaojian

2014-10-01

An infrared (IR) radiation generation model of stars and planets in celestial background is proposed in this paper. Cohen's spectral template1 is modified for high spectral resolution and accuracy. Based on the improved spectral template for stars and the blackbody assumption for planets, an IR radiation model is developed which is able to generate the celestial IR background for stars and planets appearing in sensor's field of view (FOV) for specified observing date and time, location, viewpoint and spectral band over 1.2μm ~ 35μm. In the current model, the initial locations of stars are calculated based on midcourse space experiment (MSX) IR astronomical catalogue (MSX-IRAC) 2 , while the initial locations of planets are calculated using secular variations of the planetary orbits (VSOP) theory. Simulation results show that the new IR radiation model has higher resolution and accuracy than common model.

The significance of the Sun, Moon and celestial bodies to societies in the Carpathian basin during the Bronze Age

Science.gov (United States)

Pásztor, Emília

2011-06-01

Celestial events often exerted a great or even decisive influence on the life of ancient communities. They may provide some of the foundations on which an understanding of the deeper meaning of mythologies, religious systems and even folk tales can be based. These influences are reflected and may be detected in the archaeological material as well. There is good evidence that celestial (especially solar and perhaps lunar) phenomena played a particularly important rôle in the worldview of prehistoric Europe. To reveal the social and ideational significance of concepts relating to the celestial bodies in the prehistory of the Carpathian Basin, complex investigations on orientations of houses and graves, prestige archaeological finds and iconography have been accomplished. The results indicate ideological and/or social changes, which developed into a likely organized ideological system in large part of Central Europe including the Carpathian Basin by the Late Bronze Age. It might also be the first period in prehistory when people became really interested in celestial phenomena.

George William Hill, the Great but Unknown 19th Century Celestial Mechanician

Science.gov (United States)

Corbin, Brenda G.

2012-01-01

George William Hill (1838-1914) has long been considered one of the most famous and talented celestial mechanicians of the past century and a half. However, many people have never heard of him and his work. Simon Newcomb said he "will easily rank as the greatest master of mathematical astronomy during the last quarter of the nineteenth century.” After receiving a B.A. at Rutgers in 1859, Hill began work in 1861 at the office of the American Ephemeris and Nautical Almanac in Cambridge, MA. He moved to Washington with the group in 1882 which then became part of the U. S. Naval Observatory. Newcomb, beginning his work on planetary motion, assigned the theory of Jupiter and Saturn to him, calling it about the most difficult topic. Hill's work was published by the USNO in 1890 as A New Theory of Jupiter and Saturn. From 1898 to 1901, Hill lectured on the subject of celestial mechanics at Columbia University in a position created just for him. After 1892 and until his death, he lived at the family homestead in West Nyack, NY. He never married, was something of a recluse, and spent most of his time with his books and research. Hill was an amateur botanist and enjoyed exploring on long walks in the countryside. Many honors and awards came to him during his lifetime, both from the U.S. and abroad, including serving as president of the American Mathematical Society. All of Hill's mathematical and astronomical research was incorporated in The Collected Mathematical Works of George William Hill. This work, containing a preface in French by Poincare, was published in 4 large volumes by the Carnegie Institution of Washington in 1905.

The research of the coupled orbital-attitude controlled motion of celestial body in the neighborhood of the collinear libration point L1

Science.gov (United States)

Shmyrov, A.; Shmyrov, V.; Shymanchuk, D.

2017-10-01

This article considers the motion of a celestial body within the restricted three-body problem of the Sun-Earth system. The equations of controlled coupled attitude-orbit motion in the neighborhood of collinear libration point L1 are investigated. The translational orbital motion of a celestial body is described using Hill's equations of circular restricted three-body problem of the Sun-Earth system. Rotational orbital motion is described using Euler's dynamic equations and quaternion kinematic equation. We investigate the problem of stability of celestial body rotational orbital motion in relative equilibrium positions and stabilization of celestial body rotational orbital motion with proposed control laws in the neighborhood of collinear libration point L1. To study stabilization problem, Lyapunov function is constructed in the form of the sum of the kinetic energy and special "kinematic function" of the Rodriguez-Hamiltonian parameters. Numerical modeling of the controlled rotational motion of a celestial body at libration point L1 is carried out. The numerical characteristics of the control parameters and rotational motion are given.

Celestial Navigation in the USA, Fiji, and Tunisia

Science.gov (United States)

Holbrook, Jarita C.

2015-05-01

Today there are many coastal communities that are home to navigators who use stars for position finding at night; I was, however, unaware of this fact when I began researching celestial navigation practices in 1997. My project focused on three communities: the Moce Islanders of Fiji, the Kerkennah Islanders in Tunisia, and the U.S. Navy officers and students at the United States Naval Academy, Annapolis, Maryland. My goal was to answer the question of why people continue to navigate by the stars, but also to understand the role of technology in their navigation practices. Using anthropology techniques of ethnography including participant observation, formal and informal interviews, audio and videotaping, I gathered data over five years at the three communities. I began by learning the details of how they use the stars for navigation. Next, I learned about who did the navigation and where they learned to navigate. I gathered opinions on various navigation aids and instruments, and opinions about the future of using the stars for navigation. I listened to the stories that they told about navigating. In the United States I worked in English, in Fiji, in Fijian and English, and in Tunisia, French and English. For the formal interviews I worked with translators. The navigators use stars for navigating today but the future of their techniques is not certain. Though practiced today, these celestial navigation traditions have undergone and continue to undergo changes. New navigational technologies are part of the stimulation for change, thus 'a meeting of different worlds' is symbolized by peoples encounters with these technologies.

QUIKVIS- CELESTIAL TARGET AVAILABILITY INFORMATION

Science.gov (United States)

Petruzzo, C.

1994-01-01

QUIKVIS computes the times during an Earth orbit when geometric requirements are satisfied for observing celestial objects. The observed objects may be fixed (stars, etc.) or moving (sun, moon, planets). QUIKVIS is useful for preflight analysis by those needing information on the availability of celestial objects to be observed. Two types of analyses are performed by QUIKVIS. One is used when specific objects are known, the other when targets are unknown and potentially useful regions of the sky must be identified. The results are useful in selecting candidate targets, examining the effects of observation requirements, and doing gross assessments of the effects of the orbit's right ascension of the ascending node (RAAN). The results are not appropriate when high accuracy is needed (e.g. for scheduling actual mission operations). The observation duration is calculated as a function of date, orbit node, and geometric requirements. The orbit right ascension of the ascending node can be varied to account for the effects of an uncertain launch time of day. The orbit semimajor axis and inclination are constant throughout the run. A circular orbit is assumed, but a simple program modification will allow eccentric orbits. The geometric requirements that can be processed are: 1) minimum separation angle between the line of sight to the object and the earth's horizon; 2) minimum separation angle between the line of sight to the object and the spacecraft velocity vector; 3) maximum separation angle between the line of sight to the object and the zenith direction; and 4) presence of the spacecraft in the earth's shadow. The user must supply a date or date range, the spacecraft orbit and inclination, up to 700 observation targets, and any geometric requirements to be met. The primary output is the time per orbit that conditions are satisfied, with options for sky survey maps, time since a user-specified orbit event, and bar graphs illustrating overlapping requirements. The

Further adventures of the celestial sleuth using astronomy to solve more mysteries in art, history, and literature

CERN Document Server

Olson, Donald W

2018-01-01

From the author of "Celestial Sleuth" (2014), yet more mysteries in art, history, and literature are solved by calculating phases of the Moon, determining the positions of the planets and stars, and identifying celestial objects in paintings. In addition to helping to crack difficult cases, these studies spark our imagination and provide a better understanding of the skies. Weather archives, vintage maps, tides, historical letters and diaries, military records and the assistance of experts in related fields help with this work. For each historical event influenced by astronomy, there is a different kind of mystery to be solved. How did the changing tides affect an army's battle plans? How did the phases of the moon affect how an artist painted a landscape? Follow these exciting investigations with a master “celestial sleuth” as he tracks down the truth and helps unravel mysteries as far back as the Middle Ages and as recent as the iconic 1945 photograph of a kiss in Times Square on VJ Day. Topics or "case...

Recombination of radiation defects in solid methane: neutron sources and cryo-volcanism on celestial bodies

Science.gov (United States)

Kirichek, O.; Savchenko, E. V.; Lawson, C. R.; Khyzhniy, I. V.; Jenkins, D. M.; Uyutnov, S. A.; Bludov, M. A.; Haynes, D. J.

2018-03-01

Physicochemical properties of solid methane exposed to ionizing radiation have attracted significant interest in recent years. Here we present new trends in the study of radiation effects in solid methane. We particularly focus on relaxation phenomena in solid methane pre-irradiated by energetic neutrons and electron beam. We compare experimental results obtained in the temperature range from 10K to 100K with a model based on the assumption that radiolysis defect recombinations happen in two stages, at two different temperatures. In the case of slow heating up of the solid methane sample, irradiated at 10K, the first wave of recombination occurs around 20K with a further second wave taking place between 50 and 60K. We also discuss the role of the recombination mechanisms in “burp” phenomenon discovered by J. Carpenter in the late 1980s. An understanding of these mechanisms is vital for the designing and operation of solid methane moderators used in advanced neutron sources and could also be a possible explanation for the driving forces behind cryo-volcanism on celestial bodies.

Post-Newtonian celestial dynamics in cosmology: Field equations

Science.gov (United States)

Kopeikin, Sergei M.; Petrov, Alexander N.

2013-02-01

Post-Newtonian celestial dynamics is a relativistic theory of motion of massive bodies and test particles under the influence of relatively weak gravitational forces. The standard approach for development of this theory relies upon the key concept of the isolated astronomical system supplemented by the assumption that the background spacetime is flat. The standard post-Newtonian theory of motion was instrumental in the explanation of the existing experimental data on binary pulsars, satellite, and lunar laser ranging, and in building precise ephemerides of planets in the Solar System. Recent studies of the formation of large-scale structures in our Universe indicate that the standard post-Newtonian mechanics fails to describe more subtle dynamical effects in motion of the bodies comprising the astronomical systems of larger size—galaxies and clusters of galaxies—where the Riemann curvature of the expanding Friedmann-Lemaître-Robertson-Walker universe interacts with the local gravitational field of the astronomical system and, as such, cannot be ignored. The present paper outlines theoretical principles of the post-Newtonian mechanics in the expanding Universe. It is based upon the gauge-invariant theory of the Lagrangian perturbations of cosmological manifold caused by an isolated astronomical N-body system (the Solar System, a binary star, a galaxy, and a cluster of galaxies). We postulate that the geometric properties of the background manifold are described by a homogeneous and isotropic Friedmann-Lemaître-Robertson-Walker metric governed by two primary components—the dark matter and the dark energy. The dark matter is treated as an ideal fluid with the Lagrangian taken in the form of pressure along with the scalar Clebsch potential as a dynamic variable. The dark energy is associated with a single scalar field with a potential which is hold unspecified as long as the theory permits. Both the Lagrangians of the dark matter and the scalar field are

Heavenly Networks. Celestial Maps and Globes in Circulation between Artisans, Mathematicians, and Noblemen in Renaissance Europe.

Science.gov (United States)

Gessner, Samuel

2015-01-01

The aim of this paper is to examine the iconography on a set of star charts by Albrecht Dürer (1515), and celestial globes by Caspar Vopel (1536) and Christoph Schissler (1575). The iconography on these instruments is conditioned by strong traditions which include not only the imagery on globes and planispheres (star charts), but also ancient literature about the constellations. Where this iconography departs from those traditions, the change had to do with humanism in the sixteenth century. This "humanistic" dimension is interwoven with other concerns that involve both "social" and "technical" motivations. The interplay of these three dimensions illustrates how the iconography on celestial charts and globes expresses some features of the shared knowledge and shared culture between artisans, mathematicians, and nobles in Renaissance Europe.

Celestial shadows eclipses, transits, and occultations

CERN Document Server

Westfall, John

2015-01-01

Much of what is known about the universe comes from the study of celestial shadows—eclipses, transits, and occultations.  The most dramatic are total eclipses of the Sun, which constitute one of the most dramatic and awe-inspiring events of nature.  Though once a source of consternation or dread, solar eclipses now lead thousands of amateur astronomers and eclipse-chasers to travel to remote points on the globe to savor their beauty and the adrenaline-rush of experiencing totality, and were long the only source of information about the hauntingly beautiful chromosphere and corona of the Sun.   Long before Columbus, the curved shadow of the Earth on the Moon during a lunar eclipse revealed that we inhabit a round world. The rare and wonderful transits of Venus, which occur as it passes between the Earth and the Sun, inspired eighteenth century expeditions to measure the distance from the Earth to the Sun, while the recent transits of 2004 and 2012 were the most widely observed ever--and still produced re...

International Celestial Reference Frame (ICRF): mantenimiento y extensión

Science.gov (United States)

Ma, C.; Arias, E. F.; Eubanks, T.; Fey, A. L.; Gontier, A.-M.; Jacobs, C. S.; Sovers, O. J.; Archinal, B. A.; Charlot, P.

A partir de enero de 1998 el sistema de referencia celeste convencional está representado por el International Celestial Reference System (ICRS) y materializado a través de las coordenadas VLBI del conjunto de radiofuentes extragalácticas que conforman el International Celestial Reference Frame (ICRF). La primera realización del ICRF, fue elaborada en 1995 por un grupo de expertos designado por la IAU, la que encomendó al International Earth Rotation Service el mantenimiento del ICRS, del ICRF y del vínculo con marcos de referencia en otras frecuencias. Una primera extensión del ICRF se realizó entre abril y junio de 1999, con el objetivo primario de proveer posiciones de radiofuentes extragalácticas observadas a partir de julio de 1995 y de mejorar las posiciones de las fuentes ``candidatas" con la inclusión de observaciones adicionales. Objetivos secundarios fueron monitorear a las radiofuentes para verificar que siguen siendo adecuadas para realizar al ICRF y mejorar las técnicas de análisis de datos. Como resultado del nuevo análisis se obtuvo una solución a partir de la cual se construyó la primera extensión del ICRF, denominada ICRF - Ext.1. Ella representa al ICRS, sus fuentes de definición se mantienen con las mismas posiciones y errores que en la primera realización del ICRF; las demás radiofuentes tienen coordenadas mejor determinadas que en ICRF; el marco de referencia se densificó con el agregado de 59 nuevas radiofuentes.

A Ka-Band Celestial Reference Frame with Applications to Deep Space Navigation

Science.gov (United States)

Jacobs, Christopher S.; Clark, J. Eric; Garcia-Miro, Cristina; Horiuchi, Shinji; Sotuela, Ioana

2011-01-01

The Ka-band radio spectrum is now being used for a wide variety of applications. This paper highlights the use of Ka-band as a frequency for precise deep space navigation based on a set of reference beacons provided by extragalactic quasars which emit broadband noise at Ka-band. This quasar-based celestial reference frame is constructed using X/Ka-band (8.4/32 GHz) from fifty-five 24-hour sessions with the Deep Space Network antennas in California, Australia, and Spain. We report on observations which have detected 464 sources covering the full 24 hours of Right Ascension and declinations down to -45 deg. Comparison of this X/Ka-band frame to the international standard S/X-band (2.3/8.4 GHz) ICRF2 shows wRMS agreement of approximately 200 micro-arcsec in alpha cos(delta) and approximately 300 micro-arcsec in delta. There is evidence for systematic errors at the 100 micro-arcsec level. Known errors include limited SNR, lack of instrumental phase calibration, tropospheric refraction mis-modeling, and limited southern geometry. The motivation for extending the celestial reference frame to frequencies above 8 GHz is to access more compact source morphology for improved frame stability and to support spacecraft navigation for Ka-band based NASA missions.

Celestial Navigation Fix Based on Particle Swarm Optimization

Directory of Open Access Journals (Sweden)

Tsou Ming-Cheng

2015-09-01

Full Text Available A technique for solving celestial fix problems is proposed in this study. This method is based on Particle Swarm Optimization from the field of swarm intelligence, utilizing its superior optimization and searching abilities to obtain the most probable astronomical vessel position. In addition to being applicable to two-body fix, multi-body fix, and high-altitude observation problems, it is also less reliant on the initial dead reckoning position. Moreover, by introducing spatial data processing and display functions in a Geographical Information System, calculation results and chart work used in Circle of Position graphical positioning can both be integrated. As a result, in addition to avoiding tedious and complicated computational and graphical procedures, this work has more flexibility and is more robust when compared to other analytical approaches.

Spatio-Temporal Modeling of the Earth Events and Moving of Celestial Bodies

Science.gov (United States)

Bulatova, Natalia P.

2011-09-01

It is well known that periodical and cyclical movements of cosmic sources of gravitation considerably affect Earth's geospheres (atmosphere, hydrosphere, crust, etc.) by producing tides and related phenomena, as well as the state of tectonic blocks, lithosphere plates and deep crust fractures. The result of such influence may be earthquakes and other catastrophes. Nowadays, the question modeling of geophysical processes is considerably actual. Thus studies in area of Earth' sciences have been moved from practice of observation of separate phenomena to the systematic quantitative investigation in interdisciplinary areas. A system of two modules is proposed by the author each using its own system of coordinates: (1) the model of three-dimensional spherical body of the Earth with the system of coordinates (III) including the time of events that happened on the Earth and (2) a compact model of the relative motion of celestial bodies in space and time as vectors that are changing their directions. Note the data bases of the Earth sciences have been used to construct the module (1), while the module (2) has been built using astronomic parameters of celestial bodies. The module (2) is known as "Method of moving source" (MDS) [1, 2]. As a result, on the basis of systematization, joint analysis and complexity of cosmic data and databases of Earth sciences the cause-and-effect relations between events on Earth and space bodies are established.

Review on the Celestial Sphere Positioning of FITS Format Image Based on WCS and Research on General Visualization

Science.gov (United States)

Song, W. M.; Fan, D. W.; Su, L. Y.; Cui, C. Z.

2017-11-01

Calculating the coordinate parameters recorded in the form of key/value pairs in FITS (Flexible Image Transport System) header is the key to determine FITS images' position in the celestial system. As a result, it has great significance in researching the general process of calculating the coordinate parameters. By combining CCD related parameters of astronomical telescope (such as field, focal length, and celestial coordinates in optical axis, etc.), astronomical images recognition algorithm, and WCS (World Coordinate System) theory, the parameters can be calculated effectively. CCD parameters determine the scope of star catalogue, so that they can be used to build a reference star catalogue by the corresponding celestial region of astronomical images; Star pattern recognition completes the matching between the astronomical image and reference star catalogue, and obtains a table with a certain number of stars between CCD plane coordinates and their celestial coordinates for comparison; According to different projection of the sphere to the plane, WCS can build different transfer functions between these two coordinates, and the astronomical position of image pixels can be determined by the table's data we have worked before. FITS images are used to carry out scientific data transmission and analyze as a kind of mainstream data format, but only to be viewed, edited, and analyzed in the professional astronomy software. It decides the limitation of popular science education in astronomy. The realization of a general image visualization method is significant. FITS is converted to PNG or JPEG images firstly. The coordinate parameters in the FITS header are converted to metadata in the form of AVM (Astronomy Visualization Metadata), and then the metadata is added to the PNG or JPEG header. This method can meet amateur astronomers' general needs of viewing and analyzing astronomical images in the non-astronomical software platform. The overall design flow is realized

Mechanics, analysis and geometry 200 years after Lagrange

CERN Document Server

1991-01-01

Providing a logically balanced and authoritative account of the different branches and problems of mathematical physics that Lagrange studied and developed, this volume presents up-to-date developments in differential goemetry, dynamical systems, the calculus of variations, and celestial and analytical mechanics.

Celestial orientation with the sun not in view: lizards use a time-compensated sky polarization compass.

Science.gov (United States)

Maoret, Francesco; Beltrami, Giulia; Bertolucci, Cristiano; Foà, Augusto

2014-04-01

The present investigation was aimed at testing whether the lizard sky polarization compass is time compensated. For this purpose, ruin lizards, Podarcis sicula, were both trained and tested for orientation inside a Morris water maze under clear skies with the sun not in view. During training, lizards showed a striking bimodal orientation along the training axis, demonstrating their capability of determining the symmetry plane of the sky polarization pattern and thus the use of polarization information in orientation. After reaching criteria, lizards were kept 7 days in a 6-h fast clock-shift treatment and then released with the sun not in view. Six-hour clock-shifted lizards showed a bimodal distribution of directional choices, which was oriented perpendicularly to the training axis, as it was expected on the basis of the clock-shift. The results show that the only celestial diurnal compass mechanism that does not need a direct vision of the sun disk (i.e., the sky polarization compass) is a time-compensated compass.

Discovering Mira Ceti: Celestial Change and Cosmic Continuity

Science.gov (United States)

Hatch, Robert Alan

In the short narrative that follows I introduce two new heroes. Although we begin with Fabricius's first sighting in 1596, the new pivot point in the drama is the collaboration between Hevelius and Boulliau that began around 1660. As it happens, Learned Europe paid little attention to Mira in the generation after the first scattered sightings of 1596, indeed, nearly 70 years passed before the New Star was given a working identity. Like Columbus discovering America, Fabricius and Holwarda saw different things - for convenience, I call them Fabricius's Star and Holwarda's Star. Hevelius's Historiola (Danzig, 1662) and Boulliau's Ad astronomos (Paris, 1667) presented a different vision. It made Mira famous. As I shall argue, if Hevelius gave Mira a history, Boulliau gave Mira a future.5 In the end, the New Star not only challenged the ancient cosmos, it became an enduring icon for the New Science, a returning reminder of celestial continuity and cosmic order.

Celestial delights the best astronomical events through 2020

CERN Document Server

Reddy, Francis

2012-01-01

Celestial Delights is the essential 'TV Guide' for the sky. Through extensive graphics integrated with an eight-year-long calendar of sky events, it provides a look at "don't miss" sky events, mostly for naked-eye and binocular observing. It is organized by ease of observation – lunar phases and the brighter planets come first, with solar eclipses, the aurora, and comets coming later. This third edition also includes a hefty dose of sky lore, astronomical history, and clear overviews of current science. It provides a handy reference to upcoming naked-eye events, with information broken out in clear and simple diagrams and tables that are cross-referenced against a detailed almanac for each year covered. This book puts a variety of information all in one place, presents it in a friendly way that does not require prior in-depth astronomical knowledge, and provides the context and historical background for understanding events that astronomy software or web sites lack.

The Atacama Cosmology Telescope : Physical Properties of Sunyaev-Zel'dovich Effect Clusters on the Celestial Equator

NARCIS (Netherlands)

Menanteau, F.; Sifon, Andalaft C.J.; Barrientos, L.; Battaglia, N.; Bond, J.; Crichton, D.; Das, S.; Devlin, M.; Dicker, S.; Dünner, R.; Gralla, M.; Hajian, A.; Hasselfield, M.; Hilton, M.; Hincks, A.; Hughes, J.; Infante, L.; Kosowsky, A.; Marriage, T.; Marsden, D.; Moodley, K.; Niemack, M.; Nolta, M.; Page, L.; Partridge, B.; Reese, E.; Schmitt, B.; Sievers, J.; Spergel, D.; Staggs, S.; Switzer, E.; Wollack, E.

2013-01-01

We present the optical and X-ray properties of 68 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect at 148 GHz by the Atacama Cosmology Telescope (ACT). Our sample, from an area of 504 deg$^{2}$ centered on the celestial equator, is divided into two regions. The main region uses 270

An Overview of Major Terrestrial, Celestial, and Temporal Coordinate Systems for Target Tracking

Science.gov (United States)

2016-08-10

gram (MSP) Geographic Translator (GEOTRANS) that is offered with source code in C++ and Java from the NGA at http://earth-info.nga.mil/GandG/geotrans...as their angular displacements in the sky are minimal over time. For example, Fig. 5 illustrates the predicted motion of the stars near Barnard’s star...LOD Length of day. The derivative of the DT with respect to TAI; proportional to the Earth’s angular velocity. dX,dY Celestial pole offsets. Offsets of

Analytical mechanics

CERN Document Server

Lemos, Nivaldo A

2018-01-01

Analytical mechanics is the foundation of many areas of theoretical physics including quantum theory and statistical mechanics, and has wide-ranging applications in engineering and celestial mechanics. This introduction to the basic principles and methods of analytical mechanics covers Lagrangian and Hamiltonian dynamics, rigid bodies, small oscillations, canonical transformations and Hamilton–Jacobi theory. This fully up-to-date textbook includes detailed mathematical appendices and addresses a number of advanced topics, some of them of a geometric or topological character. These include Bertrand's theorem, proof that action is least, spontaneous symmetry breakdown, constrained Hamiltonian systems, non-integrability criteria, KAM theory, classical field theory, Lyapunov functions, geometric phases and Poisson manifolds. Providing worked examples, end-of-chapter problems, and discussion of ongoing research in the field, it is suitable for advanced undergraduate students and graduate students studying analyt...

X/Ka Celestial Frame Improvements: Vision to Reality

Science.gov (United States)

Jacobs, C. S.; Bagri, D. S.; Britcliffe, M. J.; Clark, J. E.; Franco, M. M.; Garcia-Miro, C.; Goodhart, C. E.; Horiuchi, S.; Lowe, S. T.; Moll, V. E.;

The Celestial Mechanics of Newton

Indian Academy of Sciences (India)

hannes Kepler had announced his first two laws of plan- etary motion (AD 1609), ... "Mathematical Principles of Natural Philosophy" .... He provided two different sets of proofs .... the Sun. Newton then formulated a theory of tides based on the.

Basal electric and magnetic fields of celestial bodies come from positive-negative charge separation caused by gravitation of quasi-Casimir pressure in weak interaction

Science.gov (United States)

Chen, Shao-Guang

falling and till reach the equilibrium of stable spatial charge distribution, which is just the cause of the geomagnetic field and the geo-electric field (the observational value on the earth surface is about 120 V/m downward equivalent to 500000 Coulomb negative charges in the earth surface). All celestial bodies are gravitation sources and attract the molecules and ions in space to its circumference by the gravitation of own and other celestial bodies, e.g., all planets in the solar system have their own atmospheres. Therefore, the origin mechanism of geo-electric and geomagnetic fields caused by gravitation is very universal, at least it is appli-cable to all the planets in the solar system. For planets, the joint result of the gravitations of the planets and the sun makes the negative charges and dipolar charges distributed in the surfaces of the celestial bodies. The quicker the rotation is, the larger the angular momentum U is, then larger the accompanying current and magnetic moment P, it accord a experiential law found by subsistent observational data of all celestial bodies in solar system: P = -G 1/2 U cos θ / c (1), θ is the angle between the net ν 0 flux direction (mark by CMB) and the rotational axis of celestial body (Chen Shao-Guang, Chinese Science Bulletin, 26,233,1981). Uranian and Neptunian P predicted with Eq.(1) in 1981 are about -3.4•1028 Gs•cm3 and 1.9•1028 Gs•cm3 respectively (use new rotate speed measured by Voyager 2). The P measured by Voyager 2 in 1986 and 1989 are about -1.9 •1028 Gs•cm3 and 1.5•1028 Gs•cm3 respectively (the contribution of quadrupole P is converted into the contribution of dipole P alone). The neutron star pos-sesses much high density and rotational speed because of the conservation of the mass and the angular momentum during the course of the formation, then has strong gravity and largerU. From Eq.(1) there is a larger P and extremely strong surface magnetic field in neutron star. The origin mechanism of

Celestial harvest 300-plus showpieces of the heavens for telescope viewing and contemplation

CERN Document Server

Mullaney, James

2012-01-01

This book describes over 300 celestial wonders that can be viewed with common binoculars and low-power ""backyard"" telescopes incorporating refractors and reflectors.In addition to such showpieces as the Andromeda Galaxy, the largest and brightest of all galaxies after the Milky Way, and the Blue Snowball, one of the autumn sky's outstanding planetary nebulas, over 20 other special objects are listed and characterized, many of which are visible to the unaided eye on a dark, clear night.The sun, moon, Venus, Mars, Jupiter, Saturn, and other members of the earth's solar system are also describ

ASTEP South: An Antarctic Search for Transiting ExoPlanets around the celestial South pole

OpenAIRE

Crouzet , Nicolas; Guillot , Tristan; Agabi , Karim; Rivet , Jean-Pierre; Bondoux , Erick; Challita , Zalpha; Fanteï-Caujolle , Yan; Fressin , François; Mékarnia , Djamel; Schmider , François-Xavier; Valbousquet , Franck; Blazit , Alain; Bonhomme , Serge; Abe , Lyu; Daban , Jean-Baptiste

2009-01-01

ASTEP South is the first phase of the ASTEP project (Antarctic Search for Transiting ExoPlanets). The instrument is a fixed 10 cm refractor with a 4kx4k CCD camera in a thermalized box, pointing continuously a 3.88 degree x 3.88 degree field of view centered on the celestial South pole. ASTEP South became fully functional in June 2008 and obtained 1592 hours of data during the 2008 Antarctic winter. The data are of good quality but the analysis has to account for changes in the point spread f...

Polarization transition between sunlit and moonlit skies with possible implications for animal orientation and Viking navigation: anomalous celestial twilight polarization at partial moon.

Science.gov (United States)

Barta, András; Farkas, Alexandra; Száz, Dénes; Egri, Ádám; Barta, Pál; Kovács, József; Csák, Balázs; Jankovics, István; Szabó, Gyula; Horváth, Gábor

2014-08-10

Using full-sky imaging polarimetry, we measured the celestial distribution of polarization during sunset and sunrise at partial (78% and 72%) and full (100%) moon in the red (650 nm), green (550 nm), and blue (450 nm) parts of the spectrum. We investigated the temporal change of the patterns of degree p and angle α of linear polarization of sunlit and moonlit skies at dusk and dawn. We describe here the position change of the neutral points of sky polarization, and present video clips about the celestial polarization transition at moonlit twilight. We found that at partial moon and at a medium latitude (47° 15.481' N) during this transition there is a relatively short (10-20 min) period when (i) the maximum of p of skylight decreases, and (ii) from the celestial α pattern neither the solar-antisolar nor the lunar-antilunar meridian can be unambiguously determined. These meridians can serve as reference directions of animal orientation and Viking navigation based on sky polarization. The possible influence of these atmospheric optical phenomena during the polarization transition between sunlit and moonlit skies on the orientation of polarization-sensitive crepuscular/nocturnal animals and the hypothesized navigation of sunstone-aided Viking seafarers is discussed.

Time-Dependent Selection of an Optimal Set of Sources to Define a Stable Celestial Reference Frame

Science.gov (United States)

Le Bail, Karine; Gordon, David

2010-01-01

Temporal statistical position stability is required for VLBI sources to define a stable Celestial Reference Frame (CRF) and has been studied in many recent papers. This study analyzes the sources from the latest realization of the International Celestial Reference Frame (ICRF2) with the Allan variance, in addition to taking into account the apparent linear motions of the sources. Focusing on the 295 defining sources shows how they are a good compromise of different criteria, such as statistical stability and sky distribution, as well as having a sufficient number of sources, despite the fact that the most stable sources of the entire ICRF2 are mostly in the Northern Hemisphere. Nevertheless, the selection of a stable set is not unique: studying different solutions (GSF005a and AUG24 from GSFC and OPA from the Paris Observatory) over different time periods (1989.5 to 2009.5 and 1999.5 to 2009.5) leads to selections that can differ in up to 20% of the sources. Observing, recording, and network improvement are some of the causes, showing better stability for the CRF over the last decade than the last twenty years. But this may also be explained by the assumption of stationarity that is not necessarily right for some sources.

Burnham's celestial handbook. An observer's guide to the universe beyond the solar system. Volume 3. Pavo through Vulpecula

International Nuclear Information System (INIS)

Burnham, R. Jr.

1978-01-01

This volume of the Celestial Handbook treats the constellations alphabetically from Pavo through Vulpecula. For each it lists double and multiple stars, variable stars, and star clusters, nebulae, and galaxies with positions, magnitudes, etc. It also presents descriptive notes concerning some of the objects; these include history, mythology, and poetical allusions, as well as scientific information

International negotiations of natural resources on the moon and other celestial bodies : future cooperation or conflict?

OpenAIRE

Eymork, Tania Patricia

2012-01-01

This thesis aims to assess the degree to which one can expect conflict or cooperation over the natural resources on the Moon and other celestial bodies in the future. By describing and exploring how the emerging global space industry may benefit humankind, it covers existing international space treaties and how fairer administration may help to eradicate poverty by, amongst other things, providing a clean source of environmentally friendly energy. This sixtyyear young industry is redeployi...

Estimating the Celestial Reference Frame via Intra-Technique Combination

Science.gov (United States)

Iddink, Andreas; Artz, Thomas; Halsig, Sebastian; Nothnagel, Axel

2016-12-01

One of the primary goals of Very Long Baseline Interferometry (VLBI) is the determination of the International Celestial Reference Frame (ICRF). Currently the third realization of the internationally adopted CRF, the ICRF3, is under preparation. In this process, various optimizations are planned to realize a CRF that does not benefit only from the increased number of observations since the ICRF2 was published. The new ICRF can also benefit from an intra-technique combination as is done for the Terrestrial Reference Frame (TRF). Here, we aim at estimating an optimized CRF by means of an intra-technique combination. The solutions are based on the input to the official combined product of the International VLBI Service for Geodesy and Astrometry (IVS), also providing the radio source parameters. We discuss the differences in the setup using a different number of contributions and investigate the impact on TRF and CRF as well as on the Earth Orientation Parameters (EOPs). Here, we investigate the differences between the combined CRF and the individual CRFs from the different analysis centers.

A Test of the Formation Mechanism of the Broad Line Region in Active Galactic Nuclei

Czech Academy of Sciences Publication Activity Database

Czerny, B.; Du, P.; Wang, J.-M.; Karas, Vladimír

2016-01-01

Roč. 832, č. 1 (2016), 15/1-15/11 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : galaxies * emission lines * active galaxies Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

On the age and formation mechanism of the core of the Quadrantid meteoroid stream

Czech Academy of Sciences Publication Activity Database

Abedin, A.; Spurný, Pavel; Wiegert, P.; Pokorný, P.; Borovička, Jiří; Brown, P.

2015-01-01

Roč. 261, November (2015), s. 100-117 ISSN 0019-1035 R&D Projects: GA ČR(CZ) GAP209/11/1382 Institutional support: RVO:67985815 Keywords : asteroids * comets * dynamics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.383, year: 2015

A Kalman filter approach for the determination of celestial reference frames

Science.gov (United States)

Soja, Benedikt; Gross, Richard; Jacobs, Christopher; Chin, Toshio; Karbon, Maria; Nilsson, Tobias; Heinkelmann, Robert; Schuh, Harald

2017-04-01

The coordinate model of radio sources in International Celestial Reference Frames (ICRF), such as the ICRF2, has traditionally been a constant offset. While sufficient for a large part of radio sources considering current accuracy requirements, several sources exhibit significant temporal coordinate variations. In particular, the group of the so-called special handling sources is characterized by large fluctuations in the source positions. For these sources and for several from the "others" category of radio sources, a coordinate model that goes beyond a constant offset would be beneficial. However, due to the sheer amount of radio sources in catalogs like the ICRF2, and even more so with the upcoming ICRF3, it is difficult to find the most appropriate coordinate model for every single radio source. For this reason, we have developed a time series approach to the determination of celestial reference frames (CRF). We feed the radio source coordinates derived from single very long baseline interferometry (VLBI) sessions sequentially into a Kalman filter and smoother, retaining their full covariances. The estimation of the source coordinates is carried out with a temporal resolution identical to the input data, i.e. usually 1-4 days. The coordinates are assumed to behave like random walk processes, an assumption which has already successfully been made for the determination of terrestrial reference frames such as the JTRF2014. To be able to apply the most suitable process noise value for every single radio source, their statistical properties are analyzed by computing their Allan standard deviations (ADEV). Additional to the determination of process noise values, the ADEV allows drawing conclusions whether the variations in certain radio source positions significantly deviate from random walk processes. Our investigations also deal with other means of source characterization, such as the structure index, in order to derive a suitable process noise model. The Kalman

Gravitational mechanism of active life of the Earth, planets and satellites

Science.gov (United States)

Barkin, Yury

2010-05-01

From positions of geodynamic model of the forced gravitational swing, wobble and displacements of shells of a planet are studied and fundamental problems of geodynamics, geology, geophysics, planetary sciences are solved etc.: 1) The mechanism of cyclic variations of activity of natural processes in various time scales. 2) The power of endogenous activity of planetary natural processes on planets and satellites. 3) The phenomenon of polar inversion of natural processes on planets and satellites. 4) Spasmodic and catastrophic changes of activity of natural processes. 5) The phenomenon of twisting of hemispheres (latitude zones or belts) of celestial bodies. 6) Formation of the pear-shaped form of celestial bodies and the mechanism of its change. 7) The ordered planetary structures of geological formations. 8) The phenomena of bipolarity of celestial bodies and antipodality of geology formations. Mechanism. The fundamental feature of a structure of celestial bodies is their shell structure. The most investigated is the internal structure of the Earth. For the Moon and wide set of other bodies of solar system models of an internal structure have been constructed on the basis of the data of observations obtained at studying of their gravitational fields as a result of realization of the appropriate space missions. The basic components for the majority of celestial bodies are the core, the mantle and the crust. To other shells we concern atmospheres (for example, at Venus, Mars, the Titan etc.) and oceanic shells (the Titan, the Earth, Enceladus etc.). Shells are the complex (composite) formations. Planets and satellites are not spherical celestial bodies. The centers of mass of shells of the given planet (or the satellite) and their appropriate principal axes of inertia do not coincide. Accordingly, all their shells are characterized by the certain dynamic oblatenesses. Differences of dynamical oblatenesses results in various forced influences of external celestial

Global oscillations of a fluid torus as a modulation mechanism for black-hole high-frequency QPOs

Czech Academy of Sciences Publication Activity Database

Bursa, Michal

2005-01-01

Roč. 9, č. 326 (2005), s. 849-855 ISSN 0004-6337 Institutional research plan: CEZ:AV0Z1003909 Keywords : black hole physics * gravitation * X-rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.871, year: 2005

Optical Spectra of Candidate International Celestial Reference Frame (ICRF) Flat-spectrum Radio Sources. III

Energy Technology Data Exchange (ETDEWEB)

Titov, O.; Stanford, Laura M. [Geoscience Australia, P.O. Box 378, Canberra, ACT 2601 (Australia); Pursimo, T. [Nordic Optical Telescope, Nordic Optical Telescope Apartado 474E-38700 Santa Cruz de La Palma, Santa Cruz de Tenerife (Spain); Johnston, Helen M.; Hunstead, Richard W. [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia); Jauncey, David L. [CSIRO Astronomy and Space Science, ATNF and Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611 (Australia); Zenere, Katrina A., E-mail: oleg.titov@ga.gov.au [School of Physics, University of Sydney, NSW 2006 (Australia)

2017-04-01

In extending our spectroscopic program, which targets sources drawn from the International Celestial Reference Frame (ICRF) Catalog, we have obtained spectra for ∼160 compact, flat-spectrum radio sources and determined redshifts for 112 quasars and radio galaxies. A further 14 sources with featureless spectra have been classified as BL Lac objects. Spectra were obtained at three telescopes: the 3.58 m European Southern Observatory New Technology Telescope, and the two 8.2 m Gemini telescopes in Hawaii and Chile. While most of the sources are powerful quasars, a significant fraction of radio galaxies is also included from the list of non-defining ICRF radio sources.

Signature of the celestial spheres discovering order in the solar system

CERN Document Server

Warm, Harmut

2010-01-01

"A milestone in modern research on the the harmony of the spheres." - Novalis magazine "This book reignites the debate on the harmony of the spheres." - Das Goetheanum Is the solar system ordered, or is it simply the result of random and chaotic accidents? This book takes us on a powerful and compelling journey of discovery, revealing the celestial spheres' astonishingly complex patterns. The movements of the planets are found to correspond accurately with simple geometric figures and musical intervals, pointing to an exciting new perspective on the ancient idea of a "harmony of the spheres". Hartmut Warm's detailed presentation incorporates the distances, velocities and periods of conjunction of the planets, as well as the rotations of the Sun, Moon and Venus. Numerous graphics - including colour plates - illustrate the extraordinary beauty of the geometrical forms that result when the movements of several planets are viewed in relation to one another. In addition, the author describes and analyses the conce...

Few-body problem in celestial mechanics

Energy Technology Data Exchange (ETDEWEB)

Dermott, S F [Cornell Univ., Ithaca, NY (USA). Center for Radiophysics and Space Research

1984-03-26

The approaches taken by solar system dynamicists to various outstanding problems has changed considerably in recent years. Some problems for which few-body approaches have been tried in the past are now thought to involve collective phenomena. Observed features in Saturn's rings associated with resonances are examples. On the other hand, the problem of the origin of the Kirkwood gaps in the asteroid belt, for which a number of a many-body approaches (involving collisions or gas friction) have been tried, probably has a few-body solution and may involve chaos.

Numeric calculation of celestial bodies with spreadsheet analysis

Science.gov (United States)

Koch, Alexander

2016-04-01

The motion of the planets and moons in our solar system can easily be calculated for any time by the Kepler laws of planetary motion. The Kepler laws are a special case of the gravitational law of Newton, especially if you consider more than two celestial bodies. Therefore it is more basic to calculate the motion by using the gravitational law. But the problem is, that by gravitational law it is not possible to calculate the state of motion with only one step of calculation. The motion has to be numerical calculated for many time intervalls. For this reason, spreadsheet analysis is helpful for students. Skills in programmes like Excel, Calc or Gnumeric are important in professional life and can easily be learnt by students. These programmes can help to calculate the complex motions with many intervalls. The more intervalls are used, the more exact are the calculated orbits. The sutdents will first get a quick course in Excel. After that they calculate with instructions the 2-D-coordinates of the orbits of Moon and Mars. Step by step the students are coding the formulae for calculating physical parameters like coordinates, force, acceleration and velocity. The project is limited to 4 weeks or 8 lessons. So the calcualtion will only include the calculation of one body around the central mass like Earth or Sun. The three-body problem can only be shortly discussed at the end of the project.

Edward Burne-Jones’ The Days of Creation: A Celestial Utopia

Directory of Open Access Journals (Sweden)

Liana De Girolami Cheney

2014-09-01

Full Text Available Edward Burne-Jones’ cycle of The Days of Creation of 1870-66(Fogg Art Museum, Harvard University Museums, Cambridge, MA was highly praised and elegantly described by Oscar Wilde: “The picture is divided into six compartments, each representing a day in the Creation of the World, under the symbol of an angel holding a crystal globe, within which is shown the work of a day.” This essay examines how Burne-Jones visualized an unusual celestial creation where angels holding magical spheres unveil the divine manifestation for the creation of a terrestrial realm. His The Days of Creation is an aesthetic culmination of the artistic power of invention, imitation and creation of beauty. Burne-Jones borrows the divine concept of world creation to formulate his own artist creation. Selecting God’s week of creation, he empowers a daily angel to manifest the beauty and power of divine creation. Ultimately, Burne-Jones creates a cosmic utopia, a mythical heavenly and natural realm, where angels design a world of beauty to be emulated not only by the artist, but also by most of all by the viewer.

Dual-EKF-Based Real-Time Celestial Navigation for Lunar Rover

Directory of Open Access Journals (Sweden)

Li Xie

2012-01-01

Full Text Available A key requirement of lunar rover autonomous navigation is to acquire state information accurately in real-time during its motion and set up a gradual parameter-based nonlinear kinematics model for the rover. In this paper, we propose a dual-extended-Kalman-filter- (dual-EKF- based real-time celestial navigation (RCN method. The proposed method considers the rover position and velocity on the lunar surface as the system parameters and establishes a constant velocity (CV model. In addition, the attitude quaternion is considered as the system state, and the quaternion differential equation is established as the state equation, which incorporates the output of angular rate gyroscope. Therefore, the measurement equation can be established with sun direction vector from the sun sensor and speed observation from the speedometer. The gyro continuous output ensures the algorithm real-time operation. Finally, we use the dual-EKF method to solve the system equations. Simulation results show that the proposed method can acquire the rover position and heading information in real time and greatly improve the navigation accuracy. Our method overcomes the disadvantage of the cumulative error in inertial navigation.

The Role of Celestial Compass Information in Cataglyphis Ants during Learning Walks and for Neuroplasticity in the Central Complex and Mushroom Bodies.

Science.gov (United States)

Grob, Robin; Fleischmann, Pauline N; Grübel, Kornelia; Wehner, Rüdiger; Rössler, Wolfgang

2017-01-01

Central place foragers are faced with the challenge to learn the position of their nest entrance in its surroundings, in order to find their way back home every time they go out to search for food. To acquire navigational information at the beginning of their foraging career, Cataglyphis noda performs learning walks during the transition from interior worker to forager. These small loops around the nest entrance are repeatedly interrupted by strikingly accurate back turns during which the ants stop and precisely gaze back to the nest entrance-presumably to learn the landmark panorama of the nest surroundings. However, as at this point the complete navigational toolkit is not yet available, the ants are in need of a reference system for the compass component of the path integrator to align their nest entrance-directed gazes. In order to find this directional reference system, we systematically manipulated the skylight information received by ants during learning walks in their natural habitat, as it has been previously suggested that the celestial compass, as part of the path integrator, might provide such a reference system. High-speed video analyses of distinct learning walk elements revealed that even exclusion from the skylight polarization pattern, UV-light spectrum and the position of the sun did not alter the accuracy of the look back to the nest behavior. We therefore conclude that C. noda uses a different reference system to initially align their gaze directions. However, a comparison of neuroanatomical changes in the central complex and the mushroom bodies before and after learning walks revealed that exposure to UV light together with a naturally changing polarization pattern was essential to induce neuroplasticity in these high-order sensory integration centers of the ant brain. This suggests a crucial role of celestial information, in particular a changing polarization pattern, in initially calibrating the celestial compass system.

The Role of Celestial Compass Information in Cataglyphis Ants during Learning Walks and for Neuroplasticity in the Central Complex and Mushroom Bodies

Directory of Open Access Journals (Sweden)

Robin Grob

2017-11-01

Full Text Available Central place foragers are faced with the challenge to learn the position of their nest entrance in its surroundings, in order to find their way back home every time they go out to search for food. To acquire navigational information at the beginning of their foraging career, Cataglyphis noda performs learning walks during the transition from interior worker to forager. These small loops around the nest entrance are repeatedly interrupted by strikingly accurate back turns during which the ants stop and precisely gaze back to the nest entrance—presumably to learn the landmark panorama of the nest surroundings. However, as at this point the complete navigational toolkit is not yet available, the ants are in need of a reference system for the compass component of the path integrator to align their nest entrance-directed gazes. In order to find this directional reference system, we systematically manipulated the skylight information received by ants during learning walks in their natural habitat, as it has been previously suggested that the celestial compass, as part of the path integrator, might provide such a reference system. High-speed video analyses of distinct learning walk elements revealed that even exclusion from the skylight polarization pattern, UV-light spectrum and the position of the sun did not alter the accuracy of the look back to the nest behavior. We therefore conclude that C. noda uses a different reference system to initially align their gaze directions. However, a comparison of neuroanatomical changes in the central complex and the mushroom bodies before and after learning walks revealed that exposure to UV light together with a naturally changing polarization pattern was essential to induce neuroplasticity in these high-order sensory integration centers of the ant brain. This suggests a crucial role of celestial information, in particular a changing polarization pattern, in initially calibrating the celestial compass system.

The Green Bank North Celestial Cap Pulsar Survey: New Pulsars and Future Prospects

Science.gov (United States)

Lynch, Ryan S.; Swiggum, Joe; Stovall, Kevin; Chawla, Pragya; DeCesar, Megan E.; Fonseca, Emmanuel; Levin, Lina; Cui, Bingyi; Kondratiev, Vlad; Archibald, Anne; Boyles, Jason; Hessels, Jason W. T.; Jenet, Fredrick; Kaplan, David; Karako-Argaman, Chen; Kaspi, Victoria; Martinez, Jose; McLaughlin, Maura; Ransom, Scott M.; Roberts, Mallory; Siemens, Xavier; Spiewak, Renee; Stairs, Ingrid; van Leeuwn, Joeri; Green Bank North Celestial Cap Survey Collaboration

2018-01-01

The Green Bank North Celestial Cap pulsar survey is the most successful low frequency pulsar survey ever. GBNCC uses the Green Bank telescope to cover the full visible sky at 350 MHz. With the survey over 70% complete, we have discovered over 150 pulsars, including 20 MSPs and 11 RRATs. I will report on the current status of the survey and plans for its completion in the coming years. I will also report on several discoveries including: timing solutions for dozens of new pulsars; new high precision MSPs and their suitability for inclusion in pulsar timing arrays; a new relativistic double neutron star system; new pulsar mass measurements; proper motion measurements for several MSPs; a new mode changing pulsar; interesting new MSP binaries; nulling fraction analyses; and possible implications of the lack of any fast radio bursts in the survey so far.

SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP ) OBSERVATIONS: PLANETS AND CELESTIAL CALIBRATION SOURCES

International Nuclear Information System (INIS)

Weiland, J. L.; Odegard, N.; Hill, R. S.; Greason, M. R.; Wollack, E.; Hinshaw, G.; Kogut, A.; Jarosik, N.; Page, L.; Bennett, C. L.; Gold, B.; Larson, D.; Dunkley, J.; Halpern, M.; Komatsu, E.; Limon, M.; Meyer, S. S.; Nolta, M. R.; Smith, K. M.; Spergel, D. N.

2011-01-01

We present WMAP seven-year observations of bright sources which are often used as calibrators at microwave frequencies. Ten objects are studied in five frequency bands (23-94 GHz): the outer planets (Mars, Jupiter, Saturn, Uranus, and Neptune) and five fixed celestial sources (Cas A, Tau A, Cyg A, 3C274, and 3C58). The seven-year analysis of Jupiter provides temperatures which are within 1σ of the previously published WMAP five-year values, with slightly tighter constraints on variability with orbital phase (0.2% ± 0.4%), and limits (but no detections) on linear polarization. Observed temperatures for both Mars and Saturn vary significantly with viewing geometry. Scaling factors are provided which, when multiplied by the Wright Mars thermal model predictions at 350 μm, reproduce WMAP seasonally averaged observations of Mars within ∼2%. An empirical model is described which fits brightness variations of Saturn due to geometrical effects and can be used to predict the WMAP observations to within 3%. Seven-year mean temperatures for Uranus and Neptune are also tabulated. Uncertainties in Uranus temperatures are 3%-4% in the 41, 61, and 94 GHz bands; the smallest uncertainty for Neptune is 8% for the 94 GHz band. Intriguingly, the spectrum of Uranus appears to show a dip at ∼30 GHz of unidentified origin, although the feature is not of high statistical significance. Flux densities for the five selected fixed celestial sources are derived from the seven-year WMAP sky maps and are tabulated for Stokes I, Q, and U, along with polarization fraction and position angle. Fractional uncertainties for the Stokes I fluxes are typically 1% to 3%. Source variability over the seven-year baseline is also estimated. Significant secular decrease is seen for Cas A and Tau A: our results are consistent with a frequency-independent decrease of about 0.53% per year for Cas A and 0.22% per year for Tau A. We present WMAP polarization data with uncertainties of a few percent for Tau

Method of separation of celestial gamma-ray bursts from solar flares

International Nuclear Information System (INIS)

Chuang, K.W.; White, R.S.; Klebesadel, R.W.; Laros, J.G.

1991-01-01

We recently discovered 217 ''new'' celestial gamma-ray burst candidates from the ''new'' burst search of the PVO real time data base. 1 The burst search covered the time period from September 1978 to July 1988. Sixty were confirmed by at lest on other spacecraft, e.g., ISEE-3, V-11, V-12, etc. None triggered the PVO high time resolution memory. In this paper we describe a new algorithm based ont eh relationship between time width T w and hardness ratio HR, to distinguish cosmic gamma-ray bursts from solar flares without knowing the directions of the events. The criteria for identification as a gamma-ray burst candidate are: If T ww ≤a then HR≥bT w , or T w >a then HR>c. Otherwise, the event is a solar flare candidate. Here, a, b, and c are parameter which differ for different gamma-ray burst detectors. For PVO, a=18.8 s, b=(1.38/18.8) s -1 , and c=1.38. This algorithm was tested with 83 triggered and 60 nontriggered confirmed gamma-ray burst and 30 confirmed solar flares from PVO

About mechanisms of tetonic activity of the satellites

Science.gov (United States)

Barkin, Yu. V.

2003-04-01

ABOUT MECHANISMS OF TECTONIC ACTIVITY OF THE SATELLITES Yu.V. Barkin Sternberg Astronomical Institute, Moscow, Russia, barkin@sai.msu.ru Due to attraction of the central planet and others external bodies satellite is subjected by tidal and non-tidal deformations. Elastic energy is changed in dependence from mutual position and motion of celestial bodies and as result the tensional state of satellite and its tectonic (endogenous) activity also is changed. Satellites of the planets have the definite shell’s structure and due to own rotation these shells are characterized by different oblatenesses. Gravitational interaction of the satellite and its mother planet generates big additional mechanical forces (and moments) between the neighboring non-spherical shells of the satellite (mantle, core and crust). These forces and moments are cyclic functions of time, which are changed in the different time-scales. They generate corresponding cyclic perturbations of the tensional state of the shells, their deformations, small relative transnational displacements and slow rotation of the shells and others. In geological period of time it leads to a fundamental tectonic reconstruction of the body. Definite contribution to discussed phenomena are caused by classical tidal mechanism. of planet-satellite interaction. But in this report we discuss in first the new mechanisms of endogenous activity of celestial bodies. They are connected with differential gravitational attraction of non-spherical satellite shells by the external celestial bodies which leads: 1) to small relative rotation (nutations) of the shells; 2) to small relative translational motions of the shells (displacements of their center of mass); 3) to relative displacements and rotations of the shells due to eccentricity of their center of mass positions; 4) to viscous elastic deformations of the shells and oth. (Barkin, 2001). For higher evaluations of the power of satellite endogenous activities were obtained

Transit of Venus Culture: A Celestial Phenomenon Intrigues the Public

Science.gov (United States)

Bueter, Chuck

2012-01-01

When Jeremiah Horrocks first observed it in 1639, the transit of Venus was a desirable telescopic target because of its scientific value. By the next transit of Venus in 1761, though, the enlightened public also embraced it as a popular celestial phenomenon. Its stature elevated over the centuries, the transit of Venus has been featured in music, poetry, stamps, plays, books, and art. The June 2004 transit emerged as a surprising global sensation, as suggested by the search queries it generated. Google's Zeitgeist deemed Venus Transit to be the #1 Most Popular Event in the world for that month. New priorities, technologies, and media have brought new audiences to the rare alignment. As the 2012 transit of Venus approaches, the trend continues with publicly accessible capabilities that did not exist only eight years prior. For example, sites from which historic observations have been made are plotted and readily available on Google Earth. A transit of Venus phone app in development will, if fully funded, facilitate a global effort to recreate historic expeditions by allowing smartphone users to submit their observed transit timings to a database for quantifying the Astronomical Unit. While maintaining relevance in modern scientific applications, the transit of Venus has emerged as a cultural attraction that briefly intrigues the mainstream public and inspires their active participation in the spectacle.

Consistent realization of Celestial and Terrestrial Reference Frames

Science.gov (United States)

Kwak, Younghee; Bloßfeld, Mathis; Schmid, Ralf; Angermann, Detlef; Gerstl, Michael; Seitz, Manuela

2018-03-01

The Celestial Reference System (CRS) is currently realized only by Very Long Baseline Interferometry (VLBI) because it is the space geodetic technique that enables observations in that frame. In contrast, the Terrestrial Reference System (TRS) is realized by means of the combination of four space geodetic techniques: Global Navigation Satellite System (GNSS), VLBI, Satellite Laser Ranging (SLR), and Doppler Orbitography and Radiopositioning Integrated by Satellite. The Earth orientation parameters (EOP) are the link between the two types of systems, CRS and TRS. The EOP series of the International Earth Rotation and Reference Systems Service were combined of specifically selected series from various analysis centers. Other EOP series were generated by a simultaneous estimation together with the TRF while the CRF was fixed. Those computation approaches entail inherent inconsistencies between TRF, EOP, and CRF, also because the input data sets are different. A combined normal equation (NEQ) system, which consists of all the parameters, i.e., TRF, EOP, and CRF, would overcome such an inconsistency. In this paper, we simultaneously estimate TRF, EOP, and CRF from an inter-technique combined NEQ using the latest GNSS, VLBI, and SLR data (2005-2015). The results show that the selection of local ties is most critical to the TRF. The combination of pole coordinates is beneficial for the CRF, whereas the combination of Δ UT1 results in clear rotations of the estimated CRF. However, the standard deviations of the EOP and the CRF improve by the inter-technique combination which indicates the benefits of a common estimation of all parameters. It became evident that the common determination of TRF, EOP, and CRF systematically influences future ICRF computations at the level of several μas. Moreover, the CRF is influenced by up to 50 μas if the station coordinates and EOP are dominated by the satellite techniques.

Seven-year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Planets and Celestial Calibration Sources

Science.gov (United States)

Weiland, J. L.; Odegard, N.; Hill, R. S.; Wollack, E.; Hinshaw, G.; Greason, M. R.; Jarosik, N.; Page, L.; Bennett, C. L.; Dunkley, J.; Gold, B.; Halpern, M.; Kogut, A.; Komatsu, E.; Larson, D.; Limon, M.; Meyer, S. S.; Nolta, M. R.; Smith, K. M.; Spergel, D. N.; Tucker, G. S.; Wright, E. L.

2011-02-01

We present WMAP seven-year observations of bright sources which are often used as calibrators at microwave frequencies. Ten objects are studied in five frequency bands (23-94 GHz): the outer planets (Mars, Jupiter, Saturn, Uranus, and Neptune) and five fixed celestial sources (Cas A, Tau A, Cyg A, 3C274, and 3C58). The seven-year analysis of Jupiter provides temperatures which are within 1σ of the previously published WMAP five-year values, with slightly tighter constraints on variability with orbital phase (0.2% ± 0.4%), and limits (but no detections) on linear polarization. Observed temperatures for both Mars and Saturn vary significantly with viewing geometry. Scaling factors are provided which, when multiplied by the Wright Mars thermal model predictions at 350 μm, reproduce WMAP seasonally averaged observations of Mars within ~2%. An empirical model is described which fits brightness variations of Saturn due to geometrical effects and can be used to predict the WMAP observations to within 3%. Seven-year mean temperatures for Uranus and Neptune are also tabulated. Uncertainties in Uranus temperatures are 3%-4% in the 41, 61, and 94 GHz bands; the smallest uncertainty for Neptune is 8% for the 94 GHz band. Intriguingly, the spectrum of Uranus appears to show a dip at ~30 GHz of unidentified origin, although the feature is not of high statistical significance. Flux densities for the five selected fixed celestial sources are derived from the seven-year WMAP sky maps and are tabulated for Stokes I, Q, and U, along with polarization fraction and position angle. Fractional uncertainties for the Stokes I fluxes are typically 1% to 3%. Source variability over the seven-year baseline is also estimated. Significant secular decrease is seen for Cas A and Tau A: our results are consistent with a frequency-independent decrease of about 0.53% per year for Cas A and 0.22% per year for Tau A. We present WMAP polarization data with uncertainties of a few percent for Tau A

Pythagoras' celestial spheres in the context of a simple model for quantization of planetary orbits

Energy Technology Data Exchange (ETDEWEB)

Oliveira Neto, Marcal de [Instituto de Quimica, Universidade de Brasilia, Campus Universitario, Asa Norte, 70904-970 Brasilia, DF (Brazil)]. E-mail: marcal@unb.br

2006-10-15

In the present article we attempt to search for a correlation between Pythagoras and Kepler's ideas on harmony of the celestial spheres through simple quantization procedure to describe planetary orbits in our solar system. It is reasoned that starting from a Bohr-like atomic model, planetary mean radii and periods of revolution can be obtained from a set of small integers and just one input parameter given by the mean planetary radius of Mercury. It is also shown that the mean planetary distances can be calculated with the help of a Schroedinger-type equation considering the flatness of the solar system. An attempt to obtain planetary radii using both gravitational and electrostatic approaches linked by Newton's dimensionless constant of gravity is presented.

The high-energy celestial X-ray instrument on board OSO-8

International Nuclear Information System (INIS)

Dennis, B.R.; Frost, K.J.; Lencho, R.J.; Orwig, L.E.

1977-01-01

The 20 keV-3 MeV celestial X-ray detector on the eighth Orbiting Solar Observatory (OSO-8) is described. The primary objectives of this instrument are (i) to measure the energy spectrum of cosmic X-ray sources above 20 keV and (ii) to search for time variations, both periodic and irregular, in the intensity of the sources detected. The detector consists of two optically isolated CsI(Na) central crystals shielded by a large, active collimator also made of CsI(Na). The sensitive area is 27.5 cm 2 and the field-of-view is 5 0 FWHM. One of the two central crystals is completely shielded and serves as a monitor of the total internal detector background spectrum. The instrument is mounted in the wheel section of OSO-8 with the axis of its field of view offset by 5 0 from the negative spin axis of the wheel. The minimum detectable intensity of a point source which is brought to within 5 0 of the negative spin axis for greater than one day is approximately 10 -5 photons cm -2 s -1 keV -1 at 100 keV. This is determined from the background spectrum measured in orbit. (Auth.)

Painlevé test for integrability and exact solutions for the field ...

Indian Academy of Sciences (India)

- tion between two pairs of solutions. ... have been rediscovered. Keywords. Painlevé analysis; integrability; auto-Backlund transformations; exact solu- ..... [8] H Yoshida, Celestial Mechanics 81, 363 (1983). [9] H Yoshida, Celestial Mechanics ...

Autonomous celestial navigation based on Earth ultraviolet radiance and fast gradient statistic feature extraction

Science.gov (United States)

Lu, Shan; Zhang, Hanmo

2016-01-01

To meet the requirement of autonomous orbit determination, this paper proposes a fast curve fitting method based on earth ultraviolet features to obtain accurate earth vector direction, in order to achieve the high precision autonomous navigation. Firstly, combining the stable characters of earth ultraviolet radiance and the use of transmission model software of atmospheric radiation, the paper simulates earth ultraviolet radiation model on different time and chooses the proper observation band. Then the fast improved edge extracting method combined Sobel operator and local binary pattern (LBP) is utilized, which can both eliminate noises efficiently and extract earth ultraviolet limb features accurately. And earth's centroid locations on simulated images are estimated via the least square fitting method using part of the limb edges. Taken advantage of the estimated earth vector direction and earth distance, Extended Kalman Filter (EKF) is applied to realize the autonomous navigation finally. Experiment results indicate the proposed method can achieve a sub-pixel earth centroid location estimation and extremely enhance autonomous celestial navigation precision.

Searching for Axions from Celestial Objects with the X-Ray Telescope at CAST

CERN Document Server

Guthörl, T

2009-01-01

The CAST (CERN Solar Axion Telescope) experiment is designed to detect axions from the sun by making use of the inverse Primakoff effekt i.e. reconversion of axions into X-ray photons under the influence of a strong magnetic field. In order to track the sun the magnet used is mounted to a moveable device. This movability can also be used to track celestial objects of interest such as the galactic centre or Scorpio X-1, which is the brightest X-ray source besides the sun. The data gained with the CCD detector during trackings of these objects are analysed in this work. Since no signal above background can be observed an upper limit on the free parameter flux times axion-photon coupling constant^2 is determined. This upper limit in turn can be used to calculate a maximum energy loss due to axion emission for both the galactic centre and Sco X-1. The results presented in this work imply that e.g. the galactic centre can emit axions with up to 10^42 W without being detected by CAST.

Cyberspatial mechanics.

Science.gov (United States)

Bayne, Jay S

2008-06-01

In support of a generalization of systems theory, this paper introduces a new approach in modeling complex distributed systems. It offers an analytic framework for describing the behavior of interactive cyberphysical systems (CPSs), which are networked stationary or mobile information systems responsible for the real-time governance of physical processes whose behaviors unfold in cyberspace. The framework is predicated on a cyberspace-time reference model comprising three spatial dimensions plus time. The spatial domains include geospatial, infospatial, and sociospatial references, the latter describing relationships among sovereign enterprises (rational agents) that choose voluntarily to organize and interoperate for individual and mutual benefit through geospatial (physical) and infospatial (logical) transactions. Of particular relevance to CPSs are notions of timeliness and value, particularly as they relate to the real-time governance of physical processes and engagements with other cooperating CPS. Our overarching interest, as with celestial mechanics, is in the formation and evolution of clusters of cyberspatial objects and the federated systems they form.

A STUDY ON LOWER SECONDARY SCHOOL PUPILS’ PERCEPTIONS OF CERTAIN ASTRONOMICAL PHENOMENA AND CELESTIAL BODIES

Directory of Open Access Journals (Sweden)

VIRGINIA SASU

2014-01-01

Full Text Available The main purpose of this paper is to reveal certain misconceptions of astronomical phenomena and of celestial bodies that lower secondary school pupils have and which might represent an obstacle in the process of acquiring knowledge of astronomy, geography, and physics. We applied a questionnaire to a group of 26 pupils in the 6th grade at Colegiul Naţional Pedagogic „Gh. Lazăr” (“Gh. Lazăr National Pedagogical College in Cluj-Napoca, in the school year 2010 – 2011. The questionnaire consisted of six independent topics: the alternation of day and night, the seasons, the Moon, the solar system, the constellations and the speed of light. Pupils’ answers to these questions emphasize the importance of the study of astronomy as a school subject in order to facilitate building up appropriate mind constructs of the highest degree of objectivity about the world, about the environment we live in.

Ion cyclotron instability at Io: Hybrid simulation results compared to in situ observations

Czech Academy of Sciences Publication Activity Database

Šebek, Ondřej; Trávníček, Pavel M.; Walker, R.; Hellinger, Petr

2016-01-01

Roč. 121, č. 8 (2016), s. 7514-7534 ISSN 2169-9380 Institutional support: RVO:67985815 Keywords : Io * ionization processes * ion cyclotron waves Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (UFA-U) Impact factor: 2.733, year: 2016

The ICRF-3: Status, Plans, and Multi-wavelength Progress on the next generation Celestial Reference Frame.

Science.gov (United States)

Jacobs, Christopher

2015-08-01

ICRF-3 seeks to improve upon the highly successful ICRF-2. Our goals are to improve the precision, spatial and frequency coverage relative to the ICRF-2 by 2018. This date is driven by the desire to create radio frames that are ready for comparison with the Gaia optical frame.Several specific actions are underway. A collaboration to improve at S/X-band precision of the Very Long Baseline Array (VLBA) Calibrator Survey's ~2200 sources, which are typically 5 times less precise than the rest of the ICRF-2, is bearing fruit and is projected to yield a factor of 3 improvement in precision. S/X-band southern hemisphere precision improvements are underway with observations using southern antennas such as the AuScope, Warkworth, and HartRAO, South Africa.We also seek to improve radio frequency coverage with X/Ka-band and K-band work. An X/Ka frame of 660 sources now has full sky coverage from the addition of a 2nd southern station in Argentina which is strengthening the southern hemisphere in general. The X/Ka-band frame's precision is now comparable to the ICRF-2 for the 530 sources in common. A K-band collaboration has formed with similar coverage and southern precision goals. By the time of this meeting, we expect K-band to complete full sky coverage with south polar cap observations and to improve spatial density north of -30 deg declination with VLBA observations.On the analysis front, special attention is being given to combination techniques both of Very Long Baseline Interferometry (VLBI) frames and of multiple data types. Consistency of the Celestial Reference Frame (CRF) with the Terrestrial Reference Frame (TRF) and Earth Oreintation Parameters (EOP) is another area of concern. Comparison of celestial frame solutions from various groups is underway in order to identify and correct systematic errors. We will discuss evidence emerging for 100 µas zonal errors in the ICRF2 in the declination range from 0 to -30 deg.Finally, work is underway to identify and

Spins, shapes, and orbits for potentially hazardous near-earth objects by NEON

DEFF Research Database (Denmark)

Muinonen, K.; Jørgensen, U.G.

2006-01-01

radiative transfer, scattering, celestial mechanics, methods: analytical, methods: data analysis, methods: numerical, methods: statistical, techniques: photometric, astrometry, comets: general, minor planets, asteroids......radiative transfer, scattering, celestial mechanics, methods: analytical, methods: data analysis, methods: numerical, methods: statistical, techniques: photometric, astrometry, comets: general, minor planets, asteroids...

The Antikythera mechanism and the mechanical universe

Science.gov (United States)

Edmunds, M. G.

2014-10-01

How did our view of the Universe develop? By the mid-eighteenth century, a world view had developed of a system constrained by physical laws. These laws, if not entirely understood, showed regularity and could be handled mathematically to provide both explanation and prediction of celestial phenomena. Most of us have at least some hazy idea of the fundamental shift that came through the work of Copernicus, Kepler, Galileo and Newton. The idea of a 'Mechanical Universe' running rather like a clock tends to be associated with these sixteenth- and seventeenth-century pioneers. It remains a useful - and perhaps comforting - analogy. Yet, recent investigations based around the Antikythera Mechanism, an artefact from ancient Greece, reinforce a view that the 'Mechanical' conception has been around for a much longer time - indeed certainly as far back as the third century BC. The extent of mechanical design expertise existing around 100 BC as witnessed by the Antikythera Mechanism comes as a great surprise to most people. It is certainly a very ingenious device, often referred to as 'The World's First Computer' although it is really a sophisticated mechanical astronomical calculator with its functions pre-determined rather than programmable. In this review, the structure and functions of the Antikythera Mechanism are described. The astronomy, cosmology and technology inherent in the machine fit surprisingly well into the context of its contemporary Classical world. A strong claim will be made for the influence of such mechanisms on the development of astronomical and philosophical views, based on literary reference. There is evidence that the technology persisted until its spectacular and rather sudden re-appearance in Western Europe around 1300 AD. From then on it is not hard to chart a path through the astronomical clocks of the sixteenth century to Kepler's aim (expressed in a 1605 letter) to 'show that the heavenly machine is not a kind of divine, live being, but a

Supplement: "Localization and Broadband Follow-up of the Gravitational-wave Transient GW150914" (2016, ApJL, 826, L13)

Czech Academy of Sciences Publication Activity Database

Abbott, P.B.; Abbott, R.; Abbott, T.D.; Abernathy, M. R.; Acernese, F.; Ackley, K.; Adams, C.; Adams, T.; Addesso, P.; Adhikari, R. X.; Jelínek, Martin; Kubánek, Petr; Hudec, René; Caballero-García, María Dolores

2016-01-01

Roč. 225, č. 1 (2016), 8/1-8/15 ISSN 0067-0049 Institutional support: RVO:67985815 ; RVO:68378271 Keywords : gravitational waves * observational methods * electromagnetic counterparts Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (FZU-D) Impact factor: 8.955, year: 2016

Optical identifications of celestial high energy sources with the Telescopio Nazionale Galileo

International Nuclear Information System (INIS)

Turriziani, Sara

2012-01-01

To ascertain the nature of celestial high energy sources, it is crucial to identify their optical counterparts. However, the currently available astronomical public optical databases do not provide an adequate support for a systematic high energy sources identification work. In particular, the optical limiting magnitude represents a severe limitation since the deepest flux limits reached by X-ray surveys require of course similarly deeper optical catalogs to homogeneously sample the available parameter space. Nonetheless, dedicated spectroscopic campaigns are being carried out successfully with the Telescopio Nazionale Galileo (TNG), a 4-m class telescope. To set up a winning observational campaign, the first and most important step is to define a strong science case, as it will allow for selections of good targets for observations: the key is to increase the identification efficiency while keeping down the required telescope time. In this context, as the Principal Investigator, I will give an overview of the first spectroscopic campaign carried out at the TNG to identify Swift X-ray serendipitous sources, and I will show the valuable results achieved with only one night of observations. As a second example, I will review the strategy for the northern-sky classification of candidate blazars associated to unidentified Fermi γ-ray sources, and I will show the results coming from the related observational campaign at TNG I have been involved during the last two years.

The Antikythera Mechanism: The oldest mechanical universe in its scientific milieu

Science.gov (United States)

Moussas, Xenophon

2011-06-01

In this review the oldest known advanced astronomical instrument and dedicated analogue computer is presented, in context. The Antikythera Mechanism a mysterious device, assumed to be ahead of its time, probably made around 150 to 100 BCE, has been found in a 1st century BCE shipwreck near the island of Antikythera in a huge ship full of Greek treasures that were on their way to Rome. The Antikythera Mechanism is a clock-like device made of bronze gears, which looks much more advanced than its contemporary technological achievements. It is based on mathematics attributed to the Hipparchus and possibly carries knowledge and tradition that goes back to Archimedes, who according to ancient texts constructed several automata, including astronomical devices, a mechanical planetarium and a celestial sphere. The Antikythera Mechanism probably had a beautiful and expensive box; looking possibly like a very elaborate miniature Greek Temple, perhaps decorated with golden ornaments, of an elegant Hellenistic style, even perhaps with automatic statuettes, `daemons', functioning as pointers that performed some of its operations. Made out of appropriately tailored trains of gears that enable to perform specialised calculations, the mechanism carries concentric scales and pointers, in one side showing the position of the Sun in the ecliptic and the sky, possibly giving the time, hour of the day or night, like a clock. The position of the Moon and its phase is also shown during the month. On the other side of the Mechanism, having probably the size of a box (main part 32×20×6 cm), are two large spiral scales with two pointers showing the time in two different very long calendars, the first one concerning the eclipses, and lasting 18 years 11 days and 8 hours, the Saros period, repeating the solar and lunar eclipses, and enabling their prediction, and the 19 year cycle of Meton, that is the period the Moon reappears in the same place of the sky, with the same phase. An additional

Localization and Broadband Follow-up of the Gravitational-wave Transient GW150914" (2016, ApJL, 826, L13)

Czech Academy of Sciences Publication Activity Database

Abbott, P.B.; Abbott, R.; Abbott, T.D.; Abernathy, M. R.; Acernese, F.; Ackley, K.; Adams, C.; Adams, T.; Addesso, P.; Adhikari, R. X.; Jelínek, Martin; Kubánek, Petr; Hudec, René; Caballero-García, María Dolores

2016-01-01

Roč. 826, č. 1 (2016), L13/1-L13/8 ISSN 2041-8205 Institutional support: RVO:67985815 ; RVO:68378271 Keywords : gravitational waves * observational methods * electromagnetic counterparts Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (FZU-D) Impact factor: 5.522, year: 2016

The Discovery of the Regular Movements of Celestial Bodies and the Development of Monotheism in the Ancient Near East

Science.gov (United States)

Lanfranchi, G. B.

2011-06-01

For Ancient Mesopotamians, astronomical phenomena were signs signifying the gods' judgment on human behaviour. Mesopotamian scholars studied celestial phenomena for understanding the gods' will, and strongly developed astrology. From the 8th to the 6th century BC Assyrian and Babylonian astronomers achieved the ability to predict solar and lunar eclipses, and the planets' movements through mathematical calculations. Predictability of astral phenomena solicited the awareness that they are all regular, and that the universe is governed by an eternal, immutable order fixed at its very beginning. This finally favoured the idea that the cosmic order depended on the will of one god only, displacing polytheism in favour of monotheism; and astrology lost its religious importance as a mean to know the divine will.

X-ray polarimetry as a new tool to discriminate reflection from absorption scenarios - predictions for MCG-6-30-15

Czech Academy of Sciences Publication Activity Database

Marin, F.; Goosmann, R. W.; Dovčiak, Michal; Muleri, F.; Porquet, D.; Grosso, N.; Karas, Vladimír; Matt, G.

2012-01-01

Roč. 426, č. 1 (2012), L101-L105 ISSN 0035-8711 R&D Projects: GA MŠk LD12010 Institutional support: RVO:67985815 Keywords : black holes * accretion disks Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (ASU-R) Impact factor: 5.521, year: 2012

Noncanonical Hamiltonian mechanics

International Nuclear Information System (INIS)

Litteljohn, R.G.

1986-01-01

Noncanonical variables in Hamiltonian mechanics were first used by Lagrange in 1808. In spite of this, most work in Hamiltonian mechanics has been carried out in canonical variables, up to this day. One reason for this is that noncanonical coordinates are seldom needed for mechanical problems based on Lagrangians of the form L = T - V, where T is the kinetic energy and V is the potential energy. Of course, such Lagrangians arise naturally in celestial mechanics, and as a result they form the paradigms of nineteenth-century mechanics and have become enshrined in all the mechanics textbooks. Certain features of modern problems, however, lead to the use of noncanonical coordinates. Among these are issues of gauge invariance and singular Lagrange a Poisson structures. In addition, certain problems, like the flow of magnetic-field lines in physical space, are naturally formulated in terms of noncanonical coordinates. None of these features is present in the nineteenth-century paradigms of mechanics, but they do arise in problems involving particle motion in the presence of magnetic fields. For example, the motion of a particle in an electromagnetic wave is an important one in plasma physics, but the usual Hamiltonian formulation is gauge dependent. For this problem, noncanonical approaches based on Lagrangians in phase space lead to powerful computational techniques which are gauge invariant. In the limit of strong magnetic fields, particle motion becomes 'guiding-center motion'. Guiding-center motion is also best understood in terms of noncanonical coordinates. Finally the flow of magnetic-field lines through physical space is a Hamiltonian system which is best understood with noncanonical coordinates. No doubt many more systems will arise in the future for which these noncanonical techniques can be applied. (author)

The Schulhof family: solving the age puzzle

Czech Academy of Sciences Publication Activity Database

Vokrouhlický, D.; Ďurech, J.; Pravec, Petr; Kušnirák, Peter; Hornoch, Kamil; Vrastil, J.; Krugly, Yu. N.; Inasaridze, R.Ya.; Zhuzhunadze, V.; Molotov, I.E.; Pray, D. P.; Husárik, M.; Pollock, J.; Nesvorný, D.

2016-01-01

Roč. 151, č. 3 (2016), 56/1-56/12 ISSN 0004-6256 R&D Projects: GA ČR GAP209/12/0229 Grant - others:GA ČR(CZ) GA13-01308S Institutional support: RVO:67985815 Keywords : celestial mechanics * minor planets * Schulhof family Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.609, year: 2016

Spectral analysis of 1H 0707-495 with XMM-Newton

Czech Academy of Sciences Publication Activity Database

Dauser, T.; Svoboda, Jiří; Schartel, N.; Wilms, J.; Dovčiak, Michal; Ehle, M.; Karas, Vladimír; Santo-Lleó, M.; Marshall, H. L.

2012-01-01

Roč. 422, č. 3 (2012), s. 1914-1921 ISSN 0035-8711 R&D Projects: GA ČR GA202/09/0772 Institutional research plan: CEZ:AV0Z10030501 Keywords : black holes * active galaxies * accretion disks Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (ASU-R) Impact factor: 5.521, year: 2012

The Inner Meaning of Outer Space:Human Nature and the Celestial Realm

Directory of Open Access Journals (Sweden)

Timothy L. Hubbard

2009-11-01

Full Text Available Kant afirmaba que los seres humanos poseen un conocimiento a priori del espacio. Aunque este argumento se centra en la física de los cuerpos, también tiene implicaciones para la psicología del ser. Muchas culturas humanas organizan las estrellas en constelaciones (imponen estructura; atribuyen propiedades, conductas y habilidades a objetos en el reino celeste (esto es, determinan significado; y usan la regularidad percibida en los reinos celestes para el desarrollo de calendarios, navegaciones de grandes distancias, agricultura y astrología (buscan predicción y control. La inaccesibilidad física del reino celeste permite una potente fuente de metáforas, así como la protección de los mitos sobre el origen y la ascensión, los lugares del poder y aquellos donde habitan dioses, seres inmortales y otras almas. Los desarrollos en astronomía y cosmología influyeron las opiniones sobre la naturaleza humana y el lugar de la humanidad en el universo; estos cambios ponen en paralelo los descensos en el egocentrismo y el desarrollo humano. Las visiones acerca de los presuntos seres (como los ángeles y los extraterrestres del reino celestial (y cómo comunicarse con esos seres son antropocéntricas e ignoran factores evolutivos del desarrollo físico y cognitivo. Se sugiere que al considerar opiniones y usos del reino celeste, aprendemos no sólo acerca del universo, sino también sobre nosotros mismos.

Space Interferometry Mission Instrument Mechanical Layout

Science.gov (United States)

Aaron, K.; Stubbs, D.; Kroening, K.

2000-01-01

The Space Interferometry Mission, planned for launch in 2006, will measure the positions of celestial objects to an unprecedented accuracy of 4x10 to the power of negative six arc (about 1 billionth of a degree).

Microwave type III pair bursts in solar flares

Czech Academy of Sciences Publication Activity Database

Tan, B.; Mészárosová, Hana; Karlický, Marian; Huang, G.; Tan, C.M.

2016-01-01

Roč. 819, č. 1 (2016), 42/1-42/9 ISSN 0004-637X R&D Projects: GA ČR GAP209/12/0103 Grant - others:EC(XE) 295272 Program:FP7 Institutional support: RVO:67985815 Keywords : Sun * corona * flares Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; BN - Astronomy, Celestial Mechanics, Astrophysics (ASU-R) Impact factor: 5.533, year: 2016

General-relativistic celestial mechanics. II. Translational equations of motion

International Nuclear Information System (INIS)

Damour, T.; Soffel, M.; Xu, C.

1992-01-01

The translational laws of motion for gravitationally interacting systems of N arbitrarily composed and shaped, weakly self-gravitating, rotating, deformable bodies are obtained at the first post-Newtonian approximation of general relativity. The derivation uses our recently introduced multi-reference-system method and obtains the translational laws of motion by writing that, in the local center-of-mass frame of each body, relativistic inertial effects combine with post-Newtonian self- and externally generated gravitational forces to produce a global equilibrium (relativistic generalization of d'Alembert's principle). Within the first post-Newtonian approximation [i.e., neglecting terms of order (v/c) 4 in the equations of motion], our work is the first to obtain complete and explicit results, in the form of infinite series, for the laws of motion of arbitrarily composed and shaped bodies. We first obtain the laws of motion of each body as an infinite series exhibiting the coupling of all the (Blanchet-Damour) post-Newtonian multipole moments of this body to the post-Newtonian tidal moments (recently defined by us) felt by this body. We then give the explicit expression of these tidal moments in terms of post-Newtonian multipole moments of the other bodies

Contemplation and Calculation: The Universe Discovered.

Science.gov (United States)

Solovyov, Yury

1992-01-01

Discusses how early notions about celestial mechanics were restructured, one by one, involving the following concepts: the celestial sphere and its rotation; the spherical earth; planetary motion; and models for the solar system initiated by Eudoxus, Hipparchus, Ptolemy, and Copernicus. (JJK)

The young Datura asteroid family Spins, shapes, and population estimate

Czech Academy of Sciences Publication Activity Database

Vokrouhlický, D.; Pravec, Petr; Ďurech, J.; Bolin, B.; Jedicke, R.; Kušnirák, Peter; Galád, Adrián; Hornoch, Kamil; Kryszczynska, A.; Colas, F.; Moskovitz, N.; Thirouin, A.; Nesvorný, D.

2017-01-01

Roč. 598, February (2017), A91/1-A91/19 E-ISSN 1432-0746 R&D Projects: GA ČR GAP209/12/0229 Grant - others:GA ČR(CZ) GA13-01308S Institutional support: RVO:67985815 Keywords : celestial mechanics * minor planets * asteroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year Data

Directory of Open Access Journals (Sweden)

Anna Bonaldi

2012-01-01

Full Text Available We estimate the frequency spectrum of the diffuse anomalous microwave emission (AME on the North Celestial Pole (NCP region of the sky with the Correlated Component Analysis (CCA component separation method applied to WMAP 7-yr data. The NCP is a suitable region for this analysis because the AME is weakly contaminated by synchrotron and free-free emission. By modeling the AME component as a peaked spectrum we estimate the peak frequency to be 21.7±0.8 GHz, in agreement with previous analyses which favored νp < 23 GHz. The ability of our method to correctly recover the position of the peak is verified through simulations. We compare the estimated AME spectrum with theoretical spinning dust models to constrain the hydrogen density nH. The best results are obtained with densities around 0.2–0.3 cm−3, typical of warm ionised medium (WIM to warm neutral medium (WNM conditions. The degeneracy with the gas temperature prevents an accurate determination of nH, especially for low hydrogen ionization fractions, where densities of a few cm−3 are also allowed.

Unikátní astronomický přístroj posledních Přemyslovců

Czech Academy of Sciences Publication Activity Database

Hadrava, Petr; Hadravová, Alena

2014-01-01

Roč. 59, č. 1 (2014), s. 27-32 ISSN 0032-2423 R&D Projects: GA ČR(CZ) GAP405/11/0034 Institutional support: RVO:67985815 ; RVO:68378114 Keywords : history of astronomy * celestial globe Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics; AB - History (USD-C)

Non-parametric PSF estimation from celestial transit solar images using blind deconvolution

Directory of Open Access Journals (Sweden)

González Adriana

2016-01-01

Full Text Available Context: Characterization of instrumental effects in astronomical imaging is important in order to extract accurate physical information from the observations. The measured image in a real optical instrument is usually represented by the convolution of an ideal image with a Point Spread Function (PSF. Additionally, the image acquisition process is also contaminated by other sources of noise (read-out, photon-counting. The problem of estimating both the PSF and a denoised image is called blind deconvolution and is ill-posed. Aims: We propose a blind deconvolution scheme that relies on image regularization. Contrarily to most methods presented in the literature, our method does not assume a parametric model of the PSF and can thus be applied to any telescope. Methods: Our scheme uses a wavelet analysis prior model on the image and weak assumptions on the PSF. We use observations from a celestial transit, where the occulting body can be assumed to be a black disk. These constraints allow us to retain meaningful solutions for the filter and the image, eliminating trivial, translated, and interchanged solutions. Under an additive Gaussian noise assumption, they also enforce noise canceling and avoid reconstruction artifacts by promoting the whiteness of the residual between the blurred observations and the cleaned data. Results: Our method is applied to synthetic and experimental data. The PSF is estimated for the SECCHI/EUVI instrument using the 2007 Lunar transit, and for SDO/AIA using the 2012 Venus transit. Results show that the proposed non-parametric blind deconvolution method is able to estimate the core of the PSF with a similar quality to parametric methods proposed in the literature. We also show that, if these parametric estimations are incorporated in the acquisition model, the resulting PSF outperforms both the parametric and non-parametric methods.

Rotation state of 495 Eulalia and its implication

Czech Academy of Sciences Publication Activity Database

Vokrouhlický, D.; Ďurech, J.; Pravec, Petr; Oey, J.; Vrastil, J.; Hornoch, Kamil; Kušnirák, Peter; Groom, R.; Warner, B. D.; Bottke, W. F.

2016-01-01

Roč. 585, January (2016), A56/1-A56/10 ISSN 0004-6361 R&D Projects: GA ČR GAP209/12/0229 Grant - others:GA ČR(CZ) GA13-01308S; GA ČR(CZ) GA15-04816S; NASA (US) NNM10AA11C Institutional support: RVO:67985815 Keywords : celestial mechanics * minor planets * asteroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The prominent 1.6-year periodicity in solar motion due to the inner planets

Czech Academy of Sciences Publication Activity Database

Charvátová, Ivanka

2007-01-01

Roč. 25, č. 5 (2007), s. 1227-1232 ISSN 0992-7689 R&D Projects: GA AV ČR(CZ) IAA300120608 Institutional research plan: CEZ:AV0Z30120515 Keywords : solar- planet ary relationships * solar physics * celestial mechanis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.427, year: 2007

Some problems in classical mechanics and relativistic astrophysics

International Nuclear Information System (INIS)

Hut, P.

1981-01-01

The first part of this thesis is indirectly related to high energy astrophysics. It concerns the study of binary systems consisting of a normal star and a neutronstar or a black hole. To interpret the observations from such a system; in X-ray, UV, optical, infrared and radio wavelengths; it is helpful to have a general idea of the evolution of the orbital and rotational parameters. Here we enter the old field of classical mechanics, in the form of celestial mechanics. In particular the effects of tidal interaction, precession, and sudden mass loss are treated. The second part starts with an article on thought experiments with a charged black hole enclosed in a huge box and in equilibrium with its own radiation. In this way the thermodynamic aspects of the Hawking radiation are fully explored. The connection between physical and kinematical cosmological parameters, as predicted by general relativity are explored. It is shown how the standard big bang model of cosmology restricts the possible properties of some elementary particle types. The theory of white dwarf structure is compared with observations in order to put low-energy constraints on (super) gravity theories. (Auth.)

Histograms Constructed from the Data of 239-Pu Alpha-Activity Manifest a Tendency for Change in the Similar Way as at the Moments when the Sun, the Moon, Venus, Mars and Mercury Intersect the Celestial Equator

Directory of Open Access Journals (Sweden)

Kharakoz D. P.

2011-04-01

Full Text Available Earlier, the shape of histograms of the results of measurements obtained in processes of different physical nature had been shown to be determined by cosmophysical factors. Appearance of histograms of a similar shape is repeated periodically: these are the near-a-day, near-27-days and annual periods of increased probability of the similar shapes. There are two distinctly distinguished near-a-day periods: the sidereal-day (1,436 minutes and solar-day (1,440 minutes ones. The annual periods are represented by three sub-periods: the "calendar" (365 average solar days, "tropical" (365 days 5 hours and 48 minutes and "sidereal" (365 days 6 hours and 9 minutes ones. The tropical year period indicates that fact that histogram shape depends on the time elapsed since the spring equinox.The latter dependence is studied in more details in this work. We demonstrate that the appearance of similar histograms is highly probable at the same time count off from the moments of equinoxes, independent from the geographic location where the measurements had been performed: in Pushchino, Moscow Region (54 deg NL, 37 deg EL, and in Novolazarevskaya, Antarctic (70 deg SL, 11 deg EL. The sequence of the changed histogram shapes observed at the spring equinoxes was found to be opposite to that observed at the autumnal equinoxes. As the moments of equinoxes are defined by the cross of the celestial equator by Sun, we also studied that weather is not the same as observed at the moments when the celestial equator was crossed by other celestial bodies - the Moon, Venus, Mars and Mercury. Let us, for simplicity, refer to these moments as a similar term "planetary equinoxes". The regularities observed at these "planetary equinoxes" had been found to be the same as in the case of true solar equinoxes. In this article, we confine ourselves to considering the phenomenological observations only; their theoretical interpretation is supposed to be subject of further studies.

Geophysical excitation of nutation - comparison of different models

Czech Academy of Sciences Publication Activity Database

Vondrák, Jan; Ron, Cyril

2014-01-01

Roč. 11, č. 3 (2014), s. 193-200 ISSN 1214-9705 R&D Projects: GA ČR GA13-15943S Institutional research plan: CEZ:AV0Z1003909 Institutional support: RVO:67985815 Keywords : rotation of the Earth * geophysical excitations * geomagnetic jerks * celestial pole offsets * free core nutation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.389, year: 2014

September epsilon Perseid cluster as a result of orbital fragmentation

Czech Academy of Sciences Publication Activity Database

Koten, Pavel; Čapek, David; Spurný, Pavel; Vaubaillon, J.; Popek, Martin; Shrbený, Lukáš

2017-01-01

Roč. 600, April (2017), A74/1-A74/5 E-ISSN 1432-0746 R&D Projects: GA ČR GA14-25251S; GA ČR(CZ) GA16-00761S; GA MŠk(CZ) 7AMB16FR025; GA ČR(CZ) GA14-31899S Institutional support: RVO:67985815 ; RVO:68378289 Keywords : meteorites * meteors * meteoroids Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics; BN - Astronomy , Celestial Mechanics, Astrophysics (UFA-U) OBOR OECD: Astronomy (including astrophysics,space science); Astronomy (including astrophysics,space science) (UFA-U) Impact factor: 5.014, year: 2016

Evolution of the solar system - relations to physics and cosmology

International Nuclear Information System (INIS)

Treder, H.J.

1987-01-01

The Kantian cosmogony 'based on Newtonian principles' is founded on celestial mechanics, statistical mechanics, and atomistical thermodynamics. However, these fundamental physical laws are working in the given cosmos. (author)

The Sky in Early Modern English Literature A Study of Allusions to Celestial Events in Elizabethan and Jacobean Writing, 1572-1620

CERN Document Server

Levy, David H

2011-01-01

When a dissertation gets completed, the normal rule is that it is never read. By anyone.  David H. Levy’s dissertation - The Sky in Early Modern English Literature:  A Study of Allusions to Celestial Events in Elizabethan and Jacobean Writing, 1572-1620 - is different.  It opens a whole new interdisciplinary field, which involves the beautiful relationship between the night sky and the works of the early modern period of English Literature.  Although the sky enters into much of literature through the ages, the period involving William Shakespeare and his colleagues is particularly rich.               When Shakespeare was about 8 years old, his father probably took him outside his Stratford home into their northward-facing back yard.  There, father and son gazed upon the first great new star visible in the past 500 years, shining forth as brightly as Venus, and even visible in daylight.  This new star, which we now know as a supernova, completely unhinged old ideas about the cosmos.  Com...

The nonlinear dynamics of the classical few body problem

International Nuclear Information System (INIS)

Tabor, M.

1981-01-01

The complicated behavior that small dynamical systems can display is reviewed and its relevance to such diverse fields as celestial mechanics, semi-classical mechanics and fluid dynamics is discussed. (orig.)

An Improved Empirical Harmonic Model of the Celestial Intermediate Pole Offsets from a Global VLBI Solution

Science.gov (United States)

Belda, Santiago; Heinkelmann, Robert; Ferrándiz, José M.; Karbon, Maria; Nilsson, Tobias; Schuh, Harald

2017-10-01

Very Long Baseline Interferometry (VLBI) is the only space geodetic technique capable of measuring all the Earth orientation parameters (EOP) accurately and simultaneously. Modeling the Earth's rotational motion in space within the stringent consistency goals of the Global Geodetic Observing System (GGOS) makes VLBI observations essential for constraining the rotation theories. However, the inaccuracy of early VLBI data and the outdated products could cause non-compliance with these goals. In this paper, we perform a global VLBI analysis of sessions with different processing settings to determine a new set of empirical corrections to the precession offsets and rates, and to the amplitudes of a wide set of terms included in the IAU 2006/2000A precession-nutation theory. We discuss the results in terms of consistency, systematic errors, and physics of the Earth. We find that the largest improvements w.r.t. the values from IAU 2006/2000A precession-nutation theory are associated with the longest periods (e.g., 18.6-yr nutation). A statistical analysis of the residuals shows that the provided corrections attain an error reduction at the level of 15 μas. Additionally, including a Free Core Nutation (FCN) model into a priori Celestial Pole Offsets (CPOs) provides the lowest Weighted Root Mean Square (WRMS) of residuals. We show that the CPO estimates are quite insensitive to TRF choice, but slightly sensitive to the a priori EOP and the inclusion of different VLBI sessions. Finally, the remaining residuals reveal two apparent retrograde signals with periods of nearly 2069 and 1034 days.

The Green Bank Northern Celestial Cap Pulsar Survey. II. The Discovery and Timing of 10 Pulsars

Science.gov (United States)

Kawash, A. M.; McLaughlin, M. A.; Kaplan, D. L.; DeCesar, M. E.; Levin, L.; Lorimer, D. R.; Lynch, R. S.; Stovall, K.; Swiggum, J. K.; Fonseca, E.; Archibald, A. M.; Banaszak, S.; Biwer, C. M.; Boyles, J.; Cui, B.; Dartez, L. P.; Day, D.; Ernst, S.; Ford, A. J.; Flanigan, J.; Heatherly, S. A.; Hessels, J. W. T.; Hinojosa, J.; Jenet, F. A.; Karako-Argaman, C.; Kaspi, V. M.; Kondratiev, V. I.; Leake, S.; Lunsford, G.; Martinez, J. G.; Mata, A.; Matheny, T. D.; Mcewen, A. E.; Mingyar, M. G.; Orsini, A. L.; Ransom, S. M.; Roberts, M. S. E.; Rohr, M. D.; Siemens, X.; Spiewak, R.; Stairs, I. H.; van Leeuwen, J.; Walker, A. N.; Wells, B. L.

2018-04-01

We present timing solutions for 10 pulsars discovered in 350 MHz searches with the Green Bank Telescope. Nine of these were discovered in the Green Bank Northern Celestial Cap survey and one was discovered by students in the Pulsar Search Collaboratory program during an analysis of drift-scan data. Following the discovery and confirmation with the Green Bank Telescope, timing has yielded phase-connected solutions with high-precision measurements of rotational and astrometric parameters. Eight of the pulsars are slow and isolated, including PSR J0930‑2301, a pulsar with a nulling fraction lower limit of ∼30% and a nulling timescale of seconds to minutes. This pulsar also shows evidence of mode changing. The remaining two pulsars have undergone recycling, accreting material from binary companions, resulting in higher spin frequencies. PSR J0557‑2948 is an isolated, 44 ms pulsar that has been partially recycled and is likely a former member of a binary system that was disrupted by a second supernova. The paucity of such so-called “disrupted binary pulsars” (DRPs) compared to double neutron star (DNS) binaries can be used to test current evolutionary scenarios, especially the kicks imparted on the neutron stars in the second supernova. There is some evidence that DRPs have larger space velocities, which could explain their small numbers. PSR J1806+2819 is a 15 ms pulsar in a 44-day orbit with a low-mass white dwarf companion. We did not detect the companion in archival optical data, indicating that it must be older than 1200 Myr.

Planetary cores, their energy flux relationship, and its implications

Science.gov (United States)

Johnson, Fred M.

2018-02-01

Integrated surface heat flux data from each planet in our solar system plus over 50 stars, including our Sun, was plotted against each object's known mass to generate a continuous exponential curve at an R-squared value of 0.99. The unexpected yet undeniable implication of this study is that all planets and celestial objects have a similar mode of energy production. It is widely accepted that proton-proton reactions require hydrogen gas at temperatures of about 15 million degrees, neither of which can plausibly exist inside a terrestrial planet. Hence, this paper proposes a nuclear fission mechanism for all luminous celestial objects, and uses this mechanism to further suggest a developmental narrative for all celestial bodies, including our Sun. This narrative was deduced from an exponential curve drawn adjacent to the first and passing through the Earth's solid core (as a known prototype). This trend line was used to predict the core masses for each planet as a function of its luminosity.

Go Dark Charleston 2017: Preparing the Lowcountry of Charleston, SC for a Unique Celestial Event

Science.gov (United States)

Hall, C.; Runyon, C. R.; Royle, M. L.

2017-12-01

The August 2017 total solar eclipse will cross the United States, from Oregon to South Carolina, for the first time in almost 100 years. This awe-inspiring event occurs when the moon crosses between the Sun and the Earth, casting a shadow on Earth. Charleston, SC is the final point in this path before the eclipse heads offshore. As such, it provides an opportunity for Charlestonians to witness the grand finale of such an extraordinary celestial event. In collaboration, the Lowcountry Hall of Science and Math (LHSM) and the SC NASA Space Grant Consortium (SCSG) are working with entities across the state to help raise awareness among the general public to the uniqueness of this total solar eclipse. The team is delivering content-rich, hands-on professional development statewide to formal and informal educators, park rangers and city/county government personnel to ensure an understanding behind why we have eclipses as well as safety when viewing eclipses. Our team is working with community organizations, such as sports teams (i.e., Charleston Riverdogs Baseball, Charleston Battery Soccer), museums, aquariums, state and national parks, etc. to bring NASA scientists, engineers and educators together to deliver exciting community demonstrations before, during and after the day of the eclipse. The LHSM, working directly with the Aquarium and Charlestowne Landing State Park, are capturing animal behavior, specifically marine birds and wolves, during the eclipse. In addition, the team is working directly with College of Charleston undergraduates and two local high schools to launch high-altitude balloons to capture video and pictures, as well as, perform science experiments focusing on the eclipse. And finally, the LHSM through SCSG funding, is determining and documenting the extent of knowledge and cultural misconceptions surrounding solar eclipses within the greater Charleston community. In our session, the team will share the outcomes of these varied endeavors.

A Long Journey of Mathematics and Astronomy in Romania

Science.gov (United States)

Stavinschi, Magda

2010-10-01

Bucharest Astronomical Observatory celebrated recently its centenary. Its founders were all mathematicians or, better said, astronomers specialized in celestial mechanics. Their first doctoral theses were defended at Sorbonne, in the second half of the 19th century, under the guidance of the greatest specialists of the time. After they returned home, they continued what they had begun in Paris, namely celestial mechanics. The instruments they ordered and the first programmes of astronomical observations had an increasingly closer relation to mathematics, as they referred to astrometry and especially to stellar catalogues. Naturally, there were also astrophysical concerns, timid ones in the beginning, and then ever larger, especially beginning with the International Geophysical Year. The evolution of world astronomy, as well as that of Romania, seems to be following but one direction: astrophysics. The truth is that astrometry and celestial mechanics continue to lie at the basis of all astrophysical researches, actually in an entirely new and modern form. The astrometry schools recently organized, the new astrometry textbooks, as well as the IAU working groups dedicated to modern astrometry prove that the long journey of mathematics and astronomy is not over yet.

Properties of the long-term optical activity of the prototype polar AM Herculis

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2016-01-01

Roč. 463, č. 2 (2016), s. 1342-1351 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : radiation mechanisms * observational methods * circumstellar matter Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Spaceflight mechanics 1992; Proceedings of the 2nd AAS/AIAA Meeting, Colorado Springs, CO, Feb. 24-26, 1992. Pts. 1 & 2

Science.gov (United States)

Diehl, Roger E. (Editor); Schinnerer, Ralph G. (Editor); Williamson, Walton E. (Editor); Boden, Daryl G. (Editor)

1992-01-01

The present conference discusses topics in orbit determination, tethered satellite systems, celestial mechanics, guidance optimization, flexible body dynamics and control, attitude dynamics and control, Mars mission analyses, earth-orbiting mission analysis/debris, space probe mission analyses, and orbital computation numerical analyses. Attention is given to electrodynamic forces for control of tethered satellite systems, orbiting debris threats to asteroid flyby missions, launch velocity requirements for interceptors of short range ballistic missiles, transfers between libration-point orbits in the elliptic restricted problem, minimum fuel spacecraft reorientation, orbital guidance for hitting a fixed point at maximum speed, efficient computation of satellite visibility periods, orbit decay and reentry prediction for space debris, and the determination of satellite close approaches.

Long-term Evolution of the Main-On States in Hercules X-1

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2015-01-01

Roč. 150, č. 1 (2015), 3/1-3/6 ISSN 0004-6256 Institutional support: RVO:67985815 Keywords : accretion disks * circumstellar matter * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.617, year: 2015

The intermediate polar GK Persei: An unstable relation of the X-ray and the optical intensities in a series of outbursts

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2015-01-01

Roč. 575, March (2015), A65/1-A65/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : accretion disks * radiation mechanisms * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The eikonal function: the commom concept in ray optics and particle mechanics

Science.gov (United States)

Krautter, Martin

1993-04-01

The habit of teaching the movements of masses first, and propagation of light later, as an electromagnetic phenomenon was widespread. Looking further back into the history of physics, however, we see earlier the concepts for understanding light rays, and later their successful application to particle trajectories, leading to the highly developed celestial mechanics towards the end of the 19th century. And then, 1905, Karl Schwarzschild transferred the technique of `canonical coordinates,' named so by C.G.J. Jacobi in 1837, back to light rays in imaging systems. I would like to point to the chief steps in the evolution. The learning process for handling both particle and wave propagation aspects continues up to our time: Richard Feynman 1918 - 1988. We may judge each contribution: whether it opens our mind to a unifying theory, or whether it hardens partial understanding. And we can notice where the understanding of light propagation led the evolution, and how the theory for movement of masses caught up.

Computational methods in the exploration of the classical and statistical mechanics of celestial scale strings: Rotating Space Elevators

Science.gov (United States)

Knudsen, Steven; Golubovic, Leonardo

2015-04-01

With the advent of ultra-strong materials, the Space Elevator has changed from science fiction to real science. We discuss computational and theoretical methods we developed to explore classical and statistical mechanics of rotating Space Elevators (RSE). An RSE is a loopy string reaching deep into outer space. The floppy RSE loop executes a motion which is nearly a superposition of two rotations: geosynchronous rotation around the Earth, and yet another faster rotational motion of the string which goes on around a line perpendicular to the Earth at its equator. Strikingly, objects sliding along the RSE loop spontaneously oscillate between two turning points, one of which is close to the Earth (starting point) whereas the other one is deeply in the outer space. The RSE concept thus solves a major problem in space elevator science which is how to supply energy to the climbers moving along space elevator strings. The exploration of the dynamics of a floppy string interacting with objects sliding along it has required development of novel finite element algorithms described in this presentation. We thank Prof. Duncan Lorimer of WVU for kindly providing us access to his computational facility.

Celestial dynamics chaoticity and dynamics of celestial systems

CERN Document Server

Dvorak, Rudolf

2013-01-01

Written by an internationally renowned expert author and researcher, this monograph fills the need for a book conveying the sophisticated tools needed to calculate exo-planet motion and interplanetary space flight. It is unique in considering the critical problems of dynamics and stability, making use of the software Mathematica, including supplements for practical use of the formulae.A must-have for astronomers and applied mathematicians alike.

Snapping shrimp sound production patterns on Caribbean coral reefs: relationships with celestial cycles and environmental variables

Science.gov (United States)

Lillis, Ashlee; Mooney, T. Aran

2018-06-01

The rich acoustic environment of coral reefs, including the sounds of a variety of fish and invertebrates, is a reflection of the structural complexity and biological diversity of these habitats. Emerging interest in applying passive acoustic monitoring and soundscape analysis to measure coral reef habitat characteristics and track ecological patterns is hindered by a poor understanding of the most common and abundant sound producers on reefs—the snapping shrimp. Here, we sought to address several basic biophysical drivers of reef sound by investigating acoustic activity patterns of snapping shrimp populations on two adjacent coral reefs using a detailed snap detection analysis routine to a high-resolution 2.5-month acoustic dataset from the US Virgin Islands. The reefs exhibited strong diel and lunar periodicity in snap rates and clear spatial differences in snapping levels. Snap rates peaked at dawn and dusk and were higher overall during daytime versus nighttime, a seldom-reported pattern in earlier descriptions of diel snapping shrimp acoustic activity. Small differences between the sites in snap rate rhythms were detected and illustrate how analyses of specific soundscape elements might reveal subtle between-reef variation. Snap rates were highly correlated with environmental variables, including water temperature and light, and were found to be sensitive to changes in oceanographic forcing. This study further establishes snapping shrimp as key players in the coral reef chorus and provides evidence that their acoustic output reflects a combination of environmental conditions, celestial influences, and spatial habitat variation. Effective application of passive acoustic monitoring in coral reef habitats using snap rates or snapping-influenced acoustic metrics will require a mechanistic understanding of the underlying spatial and temporal variation in snapping shrimp sound production across multiple scales.

Cross-linking multiwall carbon nanotubes using PFPA to build robust, flexible and highly aligned large-scale sheets and yarns

Czech Academy of Sciences Publication Activity Database

Inoue, Y.; Nakamura, K.; Miyasaka, Y.; Nakano, T.; Kletetschka, Günther

2016-01-01

Roč. 27, č. 11 (2016) ISSN 0957-4484 Institutional support: RVO:67985831 Keywords : multi-walled carbon nanotube * nano-mechanical properties * cross-linking * PFPA * dry spinning * yarn Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.440, year: 2016

The relation between the long-term X-ray and optical activity of the polar AM Her (RX J1816.2+4952)

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2011-01-01

Roč. 16, č. 6 (2011), s. 405-411 ISSN 1384-1076 Institutional research plan: CEZ:AV0Z10030501 Keywords : radiation mechanisms * cataclysmic variables * X-rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.411, year: 2011

Classical and statistical mechanics of celestial-scale spinning strings: Rotating space elevators

Science.gov (United States)

Golubović, L.; Knudsen, S.

2009-05-01

We introduce novel and unique class of dynamical systems, Rotating Space Elevators (RSE). The RSEs are multiply rotating systems of strings reaching into outer space. Objects sliding along RSE strings do not require internal engines or propulsion to be transported from the Earth's surface into outer space. The RSEs exhibit interesting nonlinear dynamics and statistical physics phenomena.

Solar Hα and white light telescope at Hvar Observatory

Czech Academy of Sciences Publication Activity Database

Čalogovic, J.; Dumbovic, M.; Novak, S.; Vršnak, B.; Brajša, R.; Pötzi, W.; Hirtenfellner-Polanec, W.; Veronig, A.; Hanslmeier, A.; Klvaňa, Miroslav; Ambrož, Pavel

2012-01-01

Roč. 36, č. 2012 (2012), s. 83-88 ISSN 1845-8319 Institutional support: RVO:67985815 Keywords : solar observations * telescope * photosphere Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Shaping ESO2020+ Together: Feedback from the Community Poll

Czech Academy of Sciences Publication Activity Database

Primas, F.; Ivison, R.; Berger, J.-P.; Caselli, P.; De Gregorio-Monsalvo, I.; Alonso Herrero, A.; Knudsen, K.K.; Leibundgut, B.; Moitinho, A.; Saviane, I.; Spyromilio, J.; Testi, L.; Vennes, Stephane

2015-01-01

Roč. 161, September (2015), s. 6-14 ISSN 0722-6691 Institutional support: RVO:67985815 Keywords : ESO * observing programmes * data archiving Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Evolution of the complicated decaying branch of the very long outburst in XTE J1701-462

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2015-01-01

Roč. 37, May (2015), s. 26-34 ISSN 1384-1076 Grant - others:GA ČR(CZ) GA13-33324S Institutional support: RVO:67985815 Keywords : X-rays * radiation mechanisms * accretion disks Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.085, year: 2015

O původu světla ze Slunce

Czech Academy of Sciences Publication Activity Database

Švanda, Michal

2015-01-01

Roč. 65, č. 5 (2015), s. 298-301 ISSN 0009-0700 Institutional support: RVO:67985815 Keywords : sunlight * solar radiation * radiation transfer Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Visualization of Large Amount of Spectra in Virtual Observatory Environment

Czech Academy of Sciences Publication Activity Database

Šaloun, P.; Andrešič, D.; Škoda, Petr; Zelinka, I.

2014-01-01

Roč. 11, č. 6 (2014), s. 613-620 ISSN 1476-8186 Institutional support: RVO:67985815 Keywords : SPLAT-VO * virtual observatory * spectra Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Opredelenije obščego zemnogo ellipsoida pri uslovii V.V.Brovara

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Vatrt, V.; Kouba, J.; Šíma, Zdislav; Jurkina, M. I.

č. 11 (2002), s. 6-9 ISSN 0016-7126 Institutional research plan: CEZ:AV0Z1003909 Keywords : Earth's ellipsoid * determination * semimajor axis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

A New Look into the Spectral and Light Variations of varepsilon Aur

Czech Academy of Sciences Publication Activity Database

Harmanec, P.; Božić, H.; Korčáková, D.; Kotková, Lenka; Škoda, Petr; Šlechta, Miroslav; Švanda, Michal; Votruba, Viktor; Wolf, M.; Zasche, P.; Henden, A.; Ribeiro, J.

2013-01-01

Roč. 37, č. 1 (2013), s. 99-108 ISSN 1845-8319 Institutional support: RVO:67985815 Keywords : eclipsing binaries * spectroscopic binaries * variable stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Antigravitace a její projevy, aneb platí zákon zachování energie? Část 2

Czech Academy of Sciences Publication Activity Database

Křížek, Michal

2013-01-01

Roč. 63, č. 3 (2013), s. 162-167 ISSN 0009-0700 Institutional support: RVO:67985840 Keywords : gravitational aberration * solar system * dark energy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The R band light curves of eclipses of U Gem in outburst

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

č. 5453 (2003), s. 1-4 ISSN 0374-0676 Institutional research plan: CEZ:AV0Z1003909 Keywords : cataclysmic variables * general binaries stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

KAPPA: A Package for Synthesis of Optically Thin Spectra for the Non-Maxwellian kappa-distributions Based on the Chianti Database

Czech Academy of Sciences Publication Activity Database

Dzifčáková, Elena; Dudík, Jaroslav; Kotrč, Pavel; Fárník, František; Zemanová, Alena

2015-01-01

Roč. 217, č. 1 (2015), 14/1-14/14 ISSN 0067-0049 R&D Projects: GA ČR GAP209/12/1652 Institutional support: RVO:67985815 Keywords : numerical method * radiation mechanisms * coronae Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 11.257, year: 2015

Imaging and Spectroscopic Observations of a Transient Coronal Loop: Evidence for the Non-Maxwellian K Distributions

Czech Academy of Sciences Publication Activity Database

Dudík, Jaroslav; Mackovjak, Šimon; Dzifčáková, Elena; Del Zanna, G.; Williams, D.R.; Karlický, Marian; Mason, H. E.; Lörinčík, J.; Kotrč, Pavel; Fárník, František; Zemanová, Alena

2015-01-01

Roč. 807, č. 2 (2015), 123/1-123/19 ISSN 0004-637X R&D Projects: GA ČR GAP209/12/1652 Institutional support: RVO:67985815 Keywords : radiation mechanisms * Sun * corona Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.909, year: 2015

Evolution of the optical and hard X-ray activity of AM Her in a season dominated by the high states

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2016-01-01

Roč. 361, č. 7 (2016), 235/1-235/8 ISSN 0004-640X Grant - others:GAO(CZ) GC13-39464J Institutional support: RVO:67985815 Keywords : X-rays binaries * cataclysmic variables * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.622, year: 2016

Gregor@night: The future high-resolution stellar spectrograph for the GREGOR solar telescope

Czech Academy of Sciences Publication Activity Database

Strassmeier, K.G.; Ilyin, I.V.; Woche, M.; Granzer, T.; Weber, M.; Weingrill, J.; Bauer, S.-M.; Popow, E.; Denker, C.; Schmidt, W.; von der Lühe, O.; Berdyugina, S.; Collados Vera, M.; Koubský, Pavel; Hackman, T.; Mantere, M.J.

2012-01-01

Roč. 333, č. 9 (2012), s. 901-910 ISSN 0004-6337 Institutional support: RVO:67985815 Keywords : spesctrographs * telescope Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.399, year: 2012

Multi-wavelength analysis of Ellerman Bomb Light Curves

Czech Academy of Sciences Publication Activity Database

Herlender, M.; Berlicki, Arkadiusz

2011-01-01

Roč. 35, č. 1 (2011), s. 181-186 ISSN 1845-8319 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun * chromosphere * Ellerman bomb Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Low luminosity Type II supernovae - II. Pointing towards moderate mass precursors

Czech Academy of Sciences Publication Activity Database

Spiro, S.; Pastorello, A.; Pumo, M. L.; Zampieri, L.; Turatto, M.; Smartt, S. J.; Benetti, S.; Cappellaro, E.; Kawka, Adela; Vennes, Stephane

2014-01-01

Roč. 439, č. 3 (2014), s. 2873-2892 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : supernovae: general Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 5.107, year: 2014

Stopy v kosmu

Czech Academy of Sciences Publication Activity Database

Rajchl, Jaroslav

č. 23 (2002), s. 119-123 ISSN 0026-1173 Institutional research plan: CEZ:AV0Z1003909 Keywords : meteor-trains * gamma ray-bursts * big - bang Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Jiří Bičák oslavil sedmdesátiny

Czech Academy of Sciences Publication Activity Database

Balek, V.; Dvořák, L.; Hadrava, Petr; Heyrovský, D.; Karas, Vladimír; Krtouš, P.; Ledvinka, T.; Pravda, Vojtěch; Pravdová, Alena; Podolský, J.; Semerák, O.; Stuchlík, Z.; Vokrouhlický, D.; Žofka, M.

2012-01-01

Roč. 62, č. 1 (2012), s. 64-65 ISSN 0009-0700 Institutional research plan: CEZ:AV0Z10030501 Keywords : black holes * general relativity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Konec sluneční odyssey

Czech Academy of Sciences Publication Activity Database

Andréeová, K.; Švanda, Michal

2009-01-01

Roč. 15, č. 2 (2009), s. 30-33 ISSN 1211-0485 Institutional research plan: CEZ:AV0Z10030501 Keywords : solar wind * ulysses * interplanetary matter Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

All-sky Meteor Orbit System AMOS and preliminary analysis of three unusual meteor showers

Czech Academy of Sciences Publication Activity Database

Tóth, J.; Kornoš, L.; Zigo, P.; Gajdoš, Š.; Kalmančok, D.; Világi, J.; Šimon, J.; Vereš, P.; Šilha, J.; Buček, M.; Galád, Adrián; Rusňák, P.; Hrábek, P.; Ďuriš, F.; Rudawska, R.

2015-01-01

Roč. 118, December (2015), s. 102-106 ISSN 0032-0633 Institutional support: RVO:67985815 Keywords : meteor * meteorite * meteoroid streams Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.942, year: 2015

Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT 19868

Czech Academy of Sciences Publication Activity Database

Kawka, Adela; Vennes, Stephane

2016-01-01

Roč. 458, č. 1 (2016), s. 325-331 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : diffusion * stars * abundances Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Hot Emission-line Binaries Observed at Hvar

Czech Academy of Sciences Publication Activity Database

Božić, H.; Harmanec, P.; Koubský, Pavel

2013-01-01

Roč. 37, č. 1 (2013), s. 9-26 ISSN 1845-8319 Institutional research plan: CEZ:AV0Z10030501 Keywords : photoelectric UBV photometry * Be bineries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The Arecibo Galaxy Environment Survey - VII. A dense filament with extremely long H I streams

Czech Academy of Sciences Publication Activity Database

Taylor, Rhys; Minchin, R.F.; Herbst, H.; Davies, J.I.; Vazquez, C.

2014-01-01

Roč. 443, č. 3 (2014), s. 2634-2649 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : galaxies * evolution * interactions Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.107, year: 2014

Looking a gift horse in the mouth: Evaluation of wide-field asteroid photometric surveys

Czech Academy of Sciences Publication Activity Database

Harris, A. W.; Pravec, Petr; Warner, B. D.

2012-01-01

Roč. 221, č. 1 (2012), s. 226-235 ISSN 0019-1035 Institutional support: RVO:67985815 Keywords : asteroids * rotation * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.161, year: 2012

The photometric study of the symbiotic binary YY Her. I. The eclipsing model

Czech Academy of Sciences Publication Activity Database

Hric, L.; Gális, R.; Niarchos, P.; Dobrotka, A.; Šimon, Vojtěch; Šmelcer, L.; Velič, Z.; Hájek, P.; Gazeas, K.; Sobotka, P.; Koss, K.

2006-01-01

Roč. 36, č. 1 (2006), s. 26-46 ISSN 1335-1842 Institutional research plan: CEZ:AV0Z10030501 Keywords : white dwarf s * circumstellar matter Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Global Vertical Reference Frame

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Kenyon, S.; Kouba, J.; Šíma, Zdislav; Vatrt, V.; Vojtíšková, M.

2004-01-01

Roč. 33, - (2004), s. 404-407 ISSN 1436-3445 Institutional research plan: CEZ:AV0Z1003909 Keywords : geopotential WO * vertical systems * global vertical frame Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Unveiling the evolutionary phase of B[e] supergiants

Czech Academy of Sciences Publication Activity Database

Muratore, M.F.; Kraus, Michaela; Liermann, A.; Schnurr, O.; Cidale, L.S.; Arias, M.L.

2010-01-01

Roč. 53, - (2010), s. 123-126 E-ISSN 1669-9521 Institutional research plan: CEZ:AV0Z10030501 Keywords : B[e] supergiants * K-band spectra Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Satellite gravity gradient grids for geophysics

Czech Academy of Sciences Publication Activity Database

Bouman, J.; Ebbing, J.; Fuchs, M.; Sebera, Josef; Lieb, V.; Szwillus, W.; Haagmans, R.; Novák, P.

2016-01-01

Roč. 6, February (2016), 21050/1-21050/11 ISSN 2045-2322 Institutional support: RVO:67985815 Keywords : atlantic region * GOCE * model Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.259, year: 2016

Erratum: New binaries among UV-selected, hot subdwarf stars and population properties (vol 450, pg 3514, 2015)

Czech Academy of Sciences Publication Activity Database

Kawka, Adela; Vennes, Stephane; O' Toole, S.; Nemeth, P.; Burton, D.; Kotze, E.; Buckley, D.A.H.

2015-01-01

Roč. 451, č. 4 (2015), s. 3986-3986 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : addenda * close binaries * spectroscopic Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

An analytical theory of radio-wave scattering from meteoric ionization - I. Basic equation

Czech Academy of Sciences Publication Activity Database

Pecina, Petr

2016-01-01

Roč. 455, č. 2 (2016), s. 2200-2206 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : scattering * radar astronomy * meteorites Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Identification of important VO spectral services benefiting from deployment on the Grid

Czech Academy of Sciences Publication Activity Database

Škoda, Petr

2009-01-01

Roč. 2, č. 80 (2009), s. 484-492 ISSN 0037-8720 Institutional research plan: CEZ:AV0Z10030501 Keywords : virtual observatory * GRID computing * web services Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Andromeda II as a merger remnant

Czech Academy of Sciences Publication Activity Database

Lokas, E.; Ebrová, Ivana; del Pino, A.; Semczuk, M.

2014-01-01

Roč. 445, č. 1 (2014), L6-L10 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : galaxies * evolution * interactions Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.107, year: 2014

Aktivita ve spodních vrstvách sluneční atmosféry

Czech Academy of Sciences Publication Activity Database

Mészárosová, Hana; Sobotka, Michal; Kašparová, Jana; Karlický, Marian

2005-01-01

Roč. 50, č. 4 (2005), s. 286-293 ISSN 0032-2423 Institutional research plan: CEZ:AV0Z10030501 Keywords : solar activity * solar flares * solar photosphere Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The correlation between orientation of Chinese mausoleums and paleomagnetic declinations

Czech Academy of Sciences Publication Activity Database

Klokočník, Jaroslav; Kang, F.

-, č. 2 (2017), s. 65-77 ISSN 1009-4490 Institutional support: RVO:67985815 Keywords : pyramids in China * compass * Fuson hypothesis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science)

Outburst and flares from the unique source SWIFT J1955+2614

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch; Hudec, René; Castro-Tirado, A.J.; de Ugarte Postigo, A.; Corosabel, J.; Jelínek, M.; Fatkhullin, T. A.; Pérez-Ramírez, D.; Kubánek, P.; Guziy, S.; Darias, T.M.; Cunniffe, R.

2012-01-01

Roč. 422, č. 2 (2012), s. 981-989 ISSN 0035-8711 R&D Projects: GA ČR GA205/08/1207 Institutional research plan: CEZ:AV0Z10030501 Keywords : radiation mechanisms * non-thermal * gamma-ray burst Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.521, year: 2012

Long-term Optical Activity of the Hard X-ray Flaring Star DG CVn

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2017-01-01

Roč. 53, č. 1 (2017), s. 59-66 ISSN 0185-1101 Grant - others:GAO(CZ) GC13-39464J Institutional support: RVO:67985815 Keywords : observational methods * radiation mechanisms * stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 0.712, year: 2016

The depth of the honeybee's backup sun-compass systems.

Science.gov (United States)

Dovey, Katelyn M; Kemfort, Jordan R; Towne, William F

2013-06-01

Honeybees have at least three compass mechanisms: a magnetic compass; a celestial or sun compass, based on the daily rotation of the sun and sun-linked skylight patterns; and a backup celestial compass based on a memory of the sun's movements over time in relation to the landscape. The interactions of these compass systems have yet to be fully elucidated, but the celestial compass is primary in most contexts, the magnetic compass is a backup in certain contexts, and the bees' memory of the sun's course in relation to the landscape is a backup system for cloudy days. Here we ask whether bees have any further compass systems, for example a memory of the sun's movements over time in relation to the magnetic field. To test this, we challenged bees to locate the sun when their known celestial compass systems were unavailable, that is, under overcast skies in unfamiliar landscapes. We measured the bees' knowledge of the sun's location by observing their waggle dances, by which foragers indicate the directions toward food sources in relation to the sun's compass bearing. We found that bees have no celestial compass systems beyond those already known: under overcast skies in unfamiliar landscapes, bees attempt to use their landscape-based backup system to locate the sun, matching the landscapes or skylines at the test sites with those at their natal sites as best they can, even if the matches are poor and yield weak or inconsistent orientation.

Influence of X-ray radiation on the hot star wind ionization state and on the radiative force

Czech Academy of Sciences Publication Activity Database

Krtička, J.; Kubát, Jiří

2016-01-01

Roč. 58, č. 5 (2016), s. 710-718 ISSN 0273-1177 Institutional support: RVO:67985815 Keywords : Stars * winds * early-type stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.401, year: 2016

Stellar population gradients in galaxy discs from the CALIFA survey

Czech Academy of Sciences Publication Activity Database

Sanchez-Blazquez, P.; Méndez-Abreu, J.; Pérez, I.; Sanchez, S.F.; Zibetti, S.; Aguerri, J.A.L.; Bland-Hawthorn, J.; Catalán-Torrecilla, C.; Fernandes, R.C.; de Amorim, A.; de Lorenzo-Caceres, A.; Falcon-Barroso, J.; Galazzi, A.; Garcia Benito, R.; Gil de Paz, A.; Gonzalez Delgado, R.; Husemann, B.; Iglesias-Paramo, J.; Jungwiert, Bruno; Marino, R.A.; Márquez, I.; Mast, D.; Mendoza, M.A.; Molla, M.; Papaderos, P.; Ruiz-Lara, T.; van de Ven, G.; Walcher, C.J.; Wisotzki, L.

2014-01-01

Roč. 570, October (2014), A6/1-A6/85 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : galaxies * abundances * evolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Joint analysis of Rayleigh-wave dispersion and HVSR of lunar seismic data from the Apollo 14 and 16 sites

Czech Academy of Sciences Publication Activity Database

Dal Moro, Giancarlo

2015-01-01

Roč. 254, JUL 1 (2015), s. 338-349 ISSN 0019-1035 Institutional support: RVO:67985891 Keywords : moon * Regoliths * geophysics * surface- wave Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.383, year: 2015

A truly Newtonian softening length for disc simulations

Czech Academy of Sciences Publication Activity Database

Huré, J.-M.; Trova, Audrey

2015-01-01

Roč. 447, č. 2 (2015), s. 1866-1872 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : accretion discs * gravitation * numerical methods Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

The January 2015 outburst of a red nova in M31

Czech Academy of Sciences Publication Activity Database

Kurtenkov, A.A.; Pessev, P.; Tomov, T.; Barsukova, E.A.; Fabrika, S.; Vida, K.; Hornoch, Kamil; Ovcharov, E.P.; Goranskij, V.P.; Valeev, A.F.; Molnár, L.; Sárneczky, K.; Kostov, A.; Nedialkov, P.; Valenti, S.; Geier, S.; Wiersema, K.; Henze, M.; Shafter, A.W.; Dimitrova, R.V.M.; Popov, V.N.; Stritzinger, M.

2015-01-01

Roč. 578, June (2015), L10/1-L10/5 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : novae * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Short-term variability of 10 trans-Neptunian objects

Czech Academy of Sciences Publication Activity Database

Thirouin, A.; Ortiz, J.L.; Campo Bagatin, A.; Pravec, Petr; Morales, N.; Hainaut, O.; Duffard, R.

2012-01-01

Roč. 424, č. 4 (2012), s. 3156-3177 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : photometric techniques * kuiper belt general Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.521, year: 2012

Slowly increasing elongations of non-spherical asteroids caused by collisions

Czech Academy of Sciences Publication Activity Database

Henych, Tomáš; Pravec, Petr

2015-01-01

Roč. 454, č. 2 (2015), s. 1704-1710 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : numerical methods * minor planets * asteroids Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

Diagnosing the Source Region of a Solar Burst on 26 September 2011 by Using Microwave Type-III Pairs

Czech Academy of Sciences Publication Activity Database

Tan, B.-L.; Karlický, Marian; Mészárosová, Hana; Kashapova, L. K.; Huang, J.; Yan, Y.; Kontar, E. P.

2016-01-01

Roč. 291, č. 8 (2016), s. 2407-2418 ISSN 0038-0938 Institutional support: RVO:67985815 Keywords : Sun * microwave emission * magnetic reconnection Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.682, year: 2016

Comet P/2004 F3 (NEAT)

Czech Academy of Sciences Publication Activity Database

Tichá, J.; Tichý, M.; Kušnirák, Peter

-, č. 8313 (2004), s. 1 ISSN 0081-0304 R&D Projects: GA AV ČR IAA3003204 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Rotation of cometary meteoroids

Czech Academy of Sciences Publication Activity Database

Čapek, David

2014-01-01

Roč. 568, August (2014), A39/1-A39/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : meteorites * meteors * meteoroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The Relationship Between Solar Radio and Hard X-ray Emission

Czech Academy of Sciences Publication Activity Database

White, S.M.; Benz, A. O.; Christe, S.; Fárník, František; Kundu, M.R.; Mann, G.; Ning, Z.; Raulin, J.-P.; Silva-Valio, A.V.R.; Saint-Hilaire, P.; Vilmer, N.; Warmuth, A.

2011-01-01

Roč. 159, 1-4 (2011), s. 225-261 ISSN 0038-6308 Institutional support: RVO:67985815 Keywords : Sun * radio radiation * X-rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.611, year: 2011

Long-term activity of dwarf novae and variations of the recurrence time of their outbursts

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2004-01-01

Roč. 13, č. 1 (2004), s. 101-108 ISSN 1392-0049 Institutional research plan: CEZ:AV0Z1003909 Keywords : dwarf novae * white dwarf s * close binaries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Annama H5 meteorite fall: orbit, trajectory, recovery, petrology, noble gases and cosmogenic radionuclides

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Gritsevich, M.; Lyytinen, E.; Moilanen, J.

2015-01-01

Roč. 50, Supplement 1 SI (2015) [Annual Meeting of the Meteoritical Society /78./. 27.07.2015-31.07.2015, Berkeley] Institutional support: RVO:67985831 Keywords : meteorite * astrophysics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Fourier Analysis of Radio Bursts Observed with Very High Time Resolution

Czech Academy of Sciences Publication Activity Database

Dabrowski, Bartosz Premyslaw; Karlický, Marian; Rudawy, P.

2015-01-01

Roč. 290, č. 1 (2015), s. 169-180 ISSN 0038-0938 Institutional support: RVO:67985815 Keywords : solar corona * flares * radio bursts Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.862, year: 2015

A possible approach on optical analogues of gravitational attractors

KAUST Repository

San-Romá n-Alerigi, Damiá n P.; Ben Slimane, Ahmed; Ng, Tien Khee; Alsunaidi, Mohammad; Ooi, Boon S.

2013-01-01

, for example, providing an on-demand time delay or optical memories. Furthermore, beyond their practical applications to photonics, these mappings set forth an attractive realm to construct a panoply of celestial mechanics analogies and experiments

Solar flares at submillimeter wavelengths

Czech Academy of Sciences Publication Activity Database

Krucker, S.; Gimenez de Castro, C.G.; Hudson, H. S.; Trottet, G.; Bastian, T.S.; Hales, A.S.; Kašparová, Jana; Klein, K. L.; Kretzschmar, M.; Luethi, T.; Mackinnon, A.; Pohjolainen, S.; White, S.M.

2013-01-01

Roč. 21, č. 1 (2013), 58/1-58/45 ISSN 0935-4956 Institutional support: RVO:67985815 Keywords : Sun * flares * radio observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 13.312, year: 2013

Characterization of Mason Gully (H5): The second recovered fall from the Desert Fireball Network

Czech Academy of Sciences Publication Activity Database

Dyl, K.A.; Benedix, G.K.; Bland, P.A.; Friedrich, J.M.; Spurný, Pavel; Towner, M.C.; O'Keefe, M.C.; Howard, K.; Greenwood, R.C.; Macke, R.; Britt, D.; Halfpenny, A.; Thostenson, J.O.; Rudolph, R.A.; Rivers, M.; Bevan, A.W.R.

2016-01-01

Roč. 15, č. 3 (2016), s. 596-613 ISSN 1086-9379 Institutional support: RVO:67985815 Keywords : Mason Gully * analysis * geochemical data Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.391, year: 2016

Tidally Induced Bars of Galaxies in Clusters

Czech Academy of Sciences Publication Activity Database

Lokas, E.; Ebrová, Ivana; del Pino, A.; Sybilska, A.; Athanassoula, E.; Semczuk, M.; Gajda, G.; Fouquet, S.

2016-01-01

Roč. 286, č. 6 (2016), 227/1-227/13 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : galaxies * clusters * evolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

Impact of quasar proper motions on the alignment between the International Celestial Reference Frame and the Gaia reference frame

Science.gov (United States)

Liu, J.-C.; Malkin, Z.; Zhu, Z.

2018-03-01

The International Celestial Reference Frame (ICRF) is currently realized by the very long baseline interferometry (VLBI) observations of extragalactic sources with the zero proper motion assumption, while Gaia will observe proper motions of these distant and faint objects to an accuracy of tens of microarcseconds per year. This paper investigates the difference between VLBI and Gaia quasar proper motions and it aims to understand the impact of quasar proper motions on the alignment of the ICRF and Gaia reference frame. We use the latest time series data of source coordinates from the International VLBI Service analysis centres operated at Goddard Space Flight Center (GSF2017) and Paris observatory (OPA2017), as well as the Gaia auxiliary quasar solution containing 2191 high-probability optical counterparts of the ICRF2 sources. The linear proper motions in right ascension and declination of VLBI sources are derived by least-squares fits while the proper motions for Gaia sources are simulated taking into account the acceleration of the Solar system barycentre and realistic uncertainties depending on the source brightness. The individual and global features of source proper motions in GSF2017 and OPA2017 VLBI data are found to be inconsistent, which may result from differences in VLBI observations, data reduction and analysis. A comparison of the VLBI and Gaia proper motions shows that the accuracies of the components of rotation and glide between the two systems are 2-4 μas yr- 1 based on about 600 common sources. For the future alignment of the ICRF and Gaia reference frames at different wavelengths, the proper motions of quasars must necessarily be considered.

Thermal infrared observations of asteroid (99942) Apophis with Herschel

Czech Academy of Sciences Publication Activity Database

Müller, T. G.; Kiss, C.; Scheirich, Peter; Pravec, Petr; O'Rourke, L.; Vilenius, E.; Altieri, B.

2014-01-01

Roč. 566, June (2014), A22/1-A22/10 ISSN 0004-6361 R&D Projects: GA ČR GAP209/12/0229; GA MŠk LG12001 Institutional support: RVO:67985815 Keywords : minor planets * asteroids: individual * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Moving inhomogeneous envelopes of stars

Czech Academy of Sciences Publication Activity Database

Oskinova, L.M.; Kubátová, Brankica; Hamann, W.-R.

2016-01-01

Roč. 183, Special Issue (2016), s. 100-112 ISSN 0022-4073. [International Conference on Radiation Mechanisms of Astrophysical Objects - Classics Today. St. Petersburg, 21.09.2016-25.09.2016] Institutional support: RVO:67985815 Keywords : stars * mass-loss * winds Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.419, year: 2016

Proton Heating by Pick-up Ion Driven Cyclotron Waves in the Outer Heliosphere: Hybrid Expanding Box Simulations

Czech Academy of Sciences Publication Activity Database

Hellinger, Petr; Trávníček, Pavel M.

2016-01-01

Roč. 832, č. 1 (2016), 32/1-32/7 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : solar wind * instabilities * plasmas Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

A search for X-ray reprocessing echoes in the power spectral density functions of AGN

Czech Academy of Sciences Publication Activity Database

Emmanoulopoulos, D.; Papadakis, I.E.; Epitropakis, A.; Pecháček, Tomáš; Dovčiak, Michal; McHardy, I.M.

2016-01-01

Roč. 461, č. 2 (2016), s. 1642-1655 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : black hole physics * galaxies * X-rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

MESSENGER and Mariner 10 flyby observations of magnetotail structure and dynamics at Mercury

Czech Academy of Sciences Publication Activity Database

Slavin, J.A.; Anderson, B.J.; Baker, D. N.; Benna, M.; Boardsen, S.A.; Gold, R.E.; Ho, G.C.; Imber, S.; Korth, H.; Krimigis, S.M.; McNutt, Jr., R.L.; Raines, J.M.; Sarantos, M.; Schriver, D.; Solomon, S.C.; Trávníček, Pavel M.; Zurbuchen, T.H.

2012-01-01

Roč. 117, A1 (2012), A01215/1-A01215/12 ISSN 2169-9380 Institutional support: RVO:67985815 Keywords : Mercury * TCR * magnetosphere Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.174, year: 2012

The Berlin Exoplanet Search Telescope Ii Catalog Of Variable Stars. Ii. Characterization Of The Corot Src02 Field

Czech Academy of Sciences Publication Activity Database

Klagyivik, P.; Csizmadia, S.; Pasternacki, T.; Cabrera, J.; Chini, R.; Eigmueller, P.; Erikson, A.; Fruth, T.; Kabáth, Petr; Lemke, R.; Murphy, M.; Rauer, H.; Titz-Weider, R.

2016-01-01

Roč. 151, May (2016), 110/1-110/9 ISSN 0004-6256 Institutional support: RVO:67985815 Keywords : eclipsing binaries * variables stars * photometric techniques Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.609, year: 2016

Substellar companions in low-mass eclipsing binaries NSVS 01286630, NSVS 02502726, and NSVS 07453183

Czech Academy of Sciences Publication Activity Database

Wolf, M.; Zasche, P.; Kučáková, Hana; Vraštil, J.; Hornoch, Kamil; Šmelcer, L.; Bílek, F.; Pilarčík, L.; Chrastina, M.

2016-01-01

Roč. 587, March (2016), A82/1-A82/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : stars * fundamental parameters * eclipsing Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Asteroid rotation excitation by subcatastrophic impacts

Czech Academy of Sciences Publication Activity Database

Henych, T.; Pravec, Petr

2013-01-01

Roč. 432, č. 2 (2013), s. 1623-1631 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : numerical methods * minor planets * general asteroids Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 5.226, year: 2013

An analytical theory of a scattering of radio waves on meteoric ionization - II. Solution of the integro-differential equation in case of backscatter

Czech Academy of Sciences Publication Activity Database

Pecina, Petr

2016-01-01

Roč. 463, č. 2 (2016), s. 1185-1198 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : scattering * radar astronomy * meteorites * meteors * meteoroids Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Matlab script for 3D visualizing geodata on a rotating globe

Czech Academy of Sciences Publication Activity Database

Bezděk, Aleš; Sebera, Josef

2013-01-01

Roč. 56, July (2013), s. 127-130 ISSN 0098-3004 Institutional support: RVO:67985815 Keywords : 3D visualization * geoid height * elevation mode Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.562, year: 2013

Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago

Czech Academy of Sciences Publication Activity Database

Bunch, T. E.; Hermes, R. E.; Moore, A. M. T.; Kennett, D. J.; Weaver, J. C.; Wittke, J. H.; DeCarli, P. S.; Bischoff, J. L.; Hillman, G. C.; Howard, G. A.; Kimbel, D. R.; Kletetschka, Günther; Lipo, C. P.; Sakai, S.; Revay, Z.; West, A.; Firestone, R. B.; Kennett, J. P.

2012-01-01

Roč. 109, č. 28 (2012), E1903-E1912 ISSN 0027-8424 Institutional support: RVO:67985831 Keywords : tektite * miocrocraters * oxygen fugacity * trinitite Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 9.737, year: 2012

Times of impacts that deliver samples of Vesta to Earth derived from ultrasensitive Kr-81-Kr cosmic ray exposure age analysis of Eucrites

Czech Academy of Sciences Publication Activity Database

Strashnov, I.; Bland, P.A.; Spurný, Pavel; Towner, M.C.; Gilmour, D.J.

2013-01-01

Roč. 106, April (2013), s. 73-81 ISSN 0016-7037 Institutional support: RVO:67985815 Keywords : ionization mass-spectrometer * noble-gases * production-rates Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.250, year: 2013

The ionizing photon production efficiency of compact z similar to 0.3 Lyman continuum leakers and comparison with high-redshift galaxies

Czech Academy of Sciences Publication Activity Database

Schaerer, D.; Izotov, Y.I.; Verhamme, A.; Orlitová, Ivana; Thuan, T.X.; Worseck, G.; Guseva, N.G.

2016-01-01

Roč. 591, July (2016), L8/1-L8/4 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : galaxies * starburst * high-redshift Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Comet C/2004 P1 (NEAT)

Czech Academy of Sciences Publication Activity Database

Tichá, J.; Tichý, M.; Kušnirák, Peter

-, č. 8383 (2004), s. 1 ISSN 0081-0304 R&D Projects: GA AV ČR IAA3003204 Institutional research plan: CEZ:AV0Z1003909 Keywords : new comet * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet P/2004 T1 (LINEAR-NEAT)

Czech Academy of Sciences Publication Activity Database

Tichý, M.; Kušnirák, Peter

-, č. 8416 (2004), s. 1 ISSN 0081-0304 R&D Projects: GA AV ČR IAA3003204 Institutional research plan: CEZ:AV0Z1003909 Keywords : new comet * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Reply to Boslough et al.: Decades of comet research counter their claims

Czech Academy of Sciences Publication Activity Database

Napier, W. M.; Bunch, T. E.; Kennett, J. P.; Wittke, J. H.; Tankersley, K. B.; Kletetschka, Günther; Howard, G. A.; West, A.

2013-01-01

Roč. 110, č. 45 (2013), E4171-E4171 ISSN 0027-8424 Institutional support: RVO:67985831 Keywords : comet * Oort cloud * impact hazard Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 9.809, year: 2013

GNSS-R concept extended by a fine orbit tuning

Czech Academy of Sciences Publication Activity Database

Klokočník, Jaroslav; Bezděk, Aleš; Kostelecký, J.

2012-01-01

Roč. 49, č. 5 (2012), s. 957-965 ISSN 0273-1177 Institutional support: RVO:67985815 Keywords : bistatic altimetry * PARIS concept * orbit resonances Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.183, year: 2012

New findings on asteroid spin-vector distributions

Czech Academy of Sciences Publication Activity Database

Kryszczynska, A.; La Spina, A.; Paolicchi, P.; Harris, A. W.; Breiter, S.; Pravec, Petr

2007-01-01

Roč. 192, č. 1 (2007), s. 223-237 ISSN 0019-1035 Institutional research plan: CEZ:AV0Z10030501 Keywords : asteroids * rotation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.869, year: 2007

Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago

Czech Academy of Sciences Publication Activity Database

Wittke, J. H.; Weaver, J. C.; Bunch, T. E.; Kennett, J. P.; Kennett, D. J.; Moore, A. M. T.; Hillman, G. C.; Tankersley, K. B.; Goodyear, A. C.; Moore, Ch. R.; Daniel Jr., I. R.; Ray, J. H.; Lopinot, N. H.; Ferraro, D.; Israde-Alcántara, I.; Bischoff, J. L.; DeCarli, P. S.; Hermes, R. E.; Kloosterman, J. B.; Revay, Z.; Howard, G. A.; Kimbel, D. R.; Kletetschka, G.; Nábělek, Ladislav; Lipo, C. P.; Sakai, S.; West, A.; Firestone, R. B.

2013-01-01

Roč. 110, č. 23 (2013), E2088-E2097 ISSN 0027-8424 Institutional support: RVO:67985831 Keywords : Clovis-Folsom * lechatelierite * tektite * wildfires Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 9.809, year: 2013

The 1.5 meter solar telescope GREGOR

Czech Academy of Sciences Publication Activity Database

Schmidt, W.; von der Lühe, O.; Volkmer, R.; Denker, C.; Solanki, S.K.; Balthasar, H.; Bello González, N.; Berkefeld, T.; Collados Vera, M.; Fischer, A.; Halbgewachs, C.; Heidecke, F.; Hofmann, A.; Kneer, F.; Lagg, A.; Nicklas, H.; Popow, E.; Puschmann, K.G.; Schmidt, D.; Sigwarth, M.; Sobotka, Michal; Soltau, D.; Staude, J.; Strassmeier, K.G.; Waldmann, T.A.

2012-01-01

Roč. 333, č. 9 (2012), s. 796-809 ISSN 0004-6337 Institutional support: RVO:67985815 Keywords : high angular resolution * magnetic fields * telescopes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.399, year: 2012

The nature of the torus in the heavily obscured AGN Markarian 3: an X-ray study

Czech Academy of Sciences Publication Activity Database

Guainazzi, M.; Risaliti, G.; Awaki, H.; Arévalo, J. R.; Bauer, F. E.; Bianchi, S.; Boggs, J.; Brandt, W.N.; Brightman, M.; Christensen, F. E.; Craig, W. W.; Forster, K.; Hailey, C. J.; Harrison, F.; Koss, K.; Longinotti, A. L.; Markwardt, C.; Marinucci, M.; Matt, G.; Reynolds, C. S.; Ricci, C.; Stern, D.; Svoboda, Jiří; Walton, D. J.; Zhang, W.

2016-01-01

Roč. 460, č. 2 (2016), s. 1954-1969 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : active galaxies * X-rays * Markarian 3 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

SphinX: The Solar Photometer in X-Rays

Czech Academy of Sciences Publication Activity Database

Gburek, S.; Sylwester, J.; Kowalinski, M.; Bakala, J.; Kordylewski, Z.; Podgorski, P.; Plocieniak, S.; Siarkowski, M.; Sylwester, B.; Trzebinski, W.; Kuzin, S.; Pertsov, A.A.; Kotov, Yu. D.; Fárník, František; Reale, F.; Phillips, K. J. H.

2013-01-01

Roč. 283, č. 2 (2013), s. 631-649 ISSN 0038-0938 Institutional support: RVO:67985815 Keywords : solar corona * solar instrumentation * X-rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.805, year: 2013

Inference of magnetic fields in the very quiet Sun

Czech Academy of Sciences Publication Activity Database

Martinez Gonzalez, M. J.; Pastor Yabar, A.; Lagg, A.; Asensio Ramos, A.; Collados Vera, M.; Solanki, S.K.; Balthasar, H.; Berkefeld, T.; Denker, C.; Dörr, H.P.; Feller, A.; Franz, M.; Gonzalez Manrique, S. J.; Hofmann, A.; Kneer, F.; Kuckein, C.; Louis, R.E.; von der Lühe, O.; Nicklas, H.; Orozco Suárez, D.; Rezaei, R.; Schlichenmaier, R.; Schmidt, D.; Schmidt, W.; Sigwarth, M.; Sobotka, Michal; Soltau, D.; Staude, J.; Strassmeier, K.G.; Verma, M.; Waldmann, T.A.; Volkmer, R.

2016-01-01

Roč. 596, December (2016), A5/1-A5/11 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : Sun * atmosphere * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The Villalbeto de la Peña meteorite fall: II. Determination of atmospheric trajectory and orbit

Czech Academy of Sciences Publication Activity Database

Trigo-Rodríguez, J.M.; Borovička, Jiří; Spurný, Pavel; Ortiz, J.L.; Docobo, J. A.; Castro-Tirado, A.J.; Llorca, J.

2006-01-01

Roč. 41, č. 4 (2006), s. 505-517 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : meteor * meteorite Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.524, year: 2006

Puerto Lápice eucrite fall: Strewn field, physical description, probable fireball trajectory, and orbit

Czech Academy of Sciences Publication Activity Database

Trigo-Rodríguez, J.M.; Borovička, Jiří; Llorca, J.; Madiedo, J.M.; Zamorano, J.; Izquierdo, J.

2009-01-01

Roč. 44, č. 2 (2009), s. 175-186 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : meteor * meteorite Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.253, year: 2009

Signatures of X-ray reverberation in the power spectra of AGN

Czech Academy of Sciences Publication Activity Database

Papadakis, I.E.; Pecháček, Tomáš; Dovčiak, Michal; Epitropakis, A.; Emmanoulopoulos, D.; Karas, Vladimír

2016-01-01

Roč. 588, April (2016), A13/1-A13/6 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : black Holes * accretion discs Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The quest for companions to post-common envelope binaries II. NSVS14256825 and HS0705+6700

Czech Academy of Sciences Publication Activity Database

Beuermann, K.; Breitenstein, P.; Debski, B.; Diese, J.; Dubovsky, P.A.; Dreizler, S.; Hessman, F.V.; Hornoch, Kamil; Husser, T.-O.; Pojmanski, G.; Wolf, M.; Wozniak, P.R.; Zasche, P.; Denk, B.; Langer, M.; Wagner, C.; Wahrenberg, D.; Bollmann, T.; Habermann, F.N.; Haustovich, N.; Lauser, M.; Liebing, F.; Niederstadt, F.

2012-01-01

Roč. 540, March (2012), A88/1-A8/5 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : close binaries * eclipsing * subdwarfs Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

Introduction to Hamiltonian dynamical systems and the N-body problem

CERN Document Server

Meyer, Kenneth R

2017-01-01

This third edition text provides expanded material on the restricted three body problem and celestial mechanics. With each chapter containing new content, readers are provided with new material on reduction, orbifolds, and the regularization of the Kepler problem, all of which are provided with applications. The previous editions grew out of graduate level courses in mathematics, engineering, and physics given at several different universities. The courses took students who had some background in differential equations and lead them through a systematic grounding in the theory of Hamiltonian mechanics from a dynamical systems point of view. This text provides a mathematical structure of celestial mechanics ideal for beginners, and will be useful to graduate students and researchers alike. Reviews of the second edition: "The primary subject here is the basic theory of Hamiltonian differential equations studied from the perspective of differential dynamical systems. The N-body problem is used as the primary exa...

Star Maps, Planispheres, and Celestial Calendars : Engaging Students, Educators, and Communities with Multicultural STEM/STEAM Visual Resources

Science.gov (United States)

Lee, Annette S.; Wilson, William; Tibbetts, Jeffrey; Gawboy, Carl

2017-06-01

Aim:Designed by A. Lee, the Native Skywatchers initiative seeks to remember and revitalize indigenous star and earth knowledge, promoting the native voice as the lead voice. The overarching goal of Native Skywatchers is to communicate the knowledge that indigenous people practiced a sustainable way of living and sustainable engineering through a living and participatory relationship with the above and below, sky and earth. We aim to improve current inequities in education for native young people, to inspire increased cultural pride, and promote community wellness. We hope to inspire all participants towards a rekindling of the excitement and curiosity that causes us to look up at the sky in wonder generation after generation.Results:Presented here are several Native Skywatchers initiatives under the broad categories of: 1.) star maps, 2.) planispheres, and 3.) celestial calendars. In 2012 two indigenous star maps were created: the Ojibwe Giizhig Anung Masinaaigan-Ojibwe Sky Star Map (A. Lee, W. Wilson, C. Gawboy), and the D(L)akota star map, Makoce Wicanhpi Wowapi (A. Lee, J. Rock). More recently, a collaboration with W. Buck, science educator, at the Manitoba First Nations Resource Centre (MFNRC), in Winnipeg, Manitoba produced a third indigenous star map: Ininew Achakos Masinikan-Cree Star Map Book. Having star maps that are rooted in astronomical knowledge and cultural wisdoms has allowed communities multiple and ongoing opportunities for inclusive culture-based STEM learning. Next, planispheres were created based on the indigenous star maps. A learning and teaching hands-on tool, the planispheres, help partakers understand the patterns of motion in the night sky in addition to simply identifying the constellations. Most recently, calendar-paintings of the yearly motion of the Sun, the phases of the Moon, and the Venus-year have all been added to the growing list of Native Skywatchers resources. Working collaboratively with regional schools, educators, museums

INTRINSIC ELECTROMAGNETIC VARIABILITY IN CELESTIAL OBJECTS CONTAINING RAPIDLY SPINNING BLACK HOLES

Energy Technology Data Exchange (ETDEWEB)

Zhang, Fan, E-mail: fnzhang@bnu.edu.cn [Gravitational Wave and Cosmology Laboratory, Department of Astronomy, Beijing Normal University, Beijing 100875 (China); Department of Physics and Astronomy, West Virginia University, P.O. Box 6315, Morgantown, WV 26506 (United States)

2016-02-10

Analytical studies have raised the concern that a mysterious expulsion of magnetic field lines by a rapidly spinning black hole (dubbed the black hole Meissner effect) would shut down the Blandford–Znajek process and quench the jets of active galactic nuclei and microquasars. This effect is, however, not seen observationally or in numerical simulations. Previous attempts at reconciling the predictions with observations have proposed several mechanisms to evade the Meissner effect. In this paper, we identify a new evasion mechanism and discuss its observational significance. Specifically, we show that the breakdown of stationarity is sufficient to remove the expulsion of the magnetic field at all multipole orders, and that the associated temporal variation is likely turbulent because of the existence of efficient mechanisms for sharing energy across different modes. Such an intrinsic (as opposed to being driven externally by, e.g., changes in the accretion rate) variability of the electromagnetic field can produce the recorded linear correlation between microvariability amplitudes and mean fluxes, help create magnetic randomness and seed sheared magnetic loops in jets, and lead to a better theoretical fit to the X-ray microvariability power spectral density.

The correlations and anticorrelations in QPO data

Czech Academy of Sciences Publication Activity Database

Abramowicz, M. A.; Barret, D.; Bursa, Michal; Horák, Jiří; Kluzniak, W.; Rebusco, P.; Török, G.

2005-01-01

Roč. 326, č. 9 (2005), s. 864-866 ISSN 0004-6337 Institutional research plan: CEZ:AV0Z10030501 Keywords : QPOs * neutron stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.871, year: 2005

Testing MOND gravity in the shell galaxy NGC 3923

Czech Academy of Sciences Publication Activity Database

Bílek, Michal; Jungwiert, Bruno; Jílková, L.; Ebrová, Ivana; Bartošková, Kateřina; Křížek, Miroslav

2013-01-01

Roč. 559, November (2013), A110/1-A110/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : gravitation * elliptical and lenticular galaxies Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

Asteroid Impact & Deflection Assessment mission: Kinetic impactor

Czech Academy of Sciences Publication Activity Database

Cheng, A.F.; Michel, R.; Jutzi, M.; Rivkin, A. S.; Stickle, A.; Barnouin, O.; Ernst, C.; Atchison, J.; Pravec, Petr; Richardson, D.C.

2016-01-01

Roč. 121, February (2016), s. 25-37 ISSN 0032-0633 Institutional support: RVO:67985815 Keywords : planetary defense * near- Earth asteroids * asteroid impact hazards Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.892, year: 2016

Furiously fast and red: sub-second optical flaring in V404 Cyg during the 2015 outburst peak

Czech Academy of Sciences Publication Activity Database

Gandhi, P.; Littlefair, S. P.; Hardy, L. K.; Dhillon, V. S.; Marsh, T. R.; Shaw, A. W.; Altamirano, D.; Caballero-García, María Dolores; Casares, J.; Casella, P.; Castro-Tirado, A.J.; Charles, P. A.; Dallilar, Y.; Eikenberry, S.; Fender, R. P.; Hynes, R. I.; Knigge, C.; Kuulkers, E.; Mooley, K.; Munoz-Darias, T.; Pahari, M.; Rahoui, F.; Russell, D. M.; Hernández Santisteban, J.V.; Shahbaz, T.; Terndrup, D. M.; Tomsick, J.; Walton, D. J.

2016-01-01

Roč. 459, č. 1 (2016), s. 554-572 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : accretion discs * black holes * V404 Cyg Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Minimum X-ray source size of the on-axis corona in AGN

Czech Academy of Sciences Publication Activity Database

Dovčiak, Michal; Done, C.

2016-01-01

Roč. 337, 4-5 (2016), s. 441-447 ISSN 0004-6337 Institutional support: RVO:67985815 Keywords : accretion disks * black hole physics * active galaxies Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.916, year: 2016

Period changes of the long-period cataclysmic binary EX Draconis

Czech Academy of Sciences Publication Activity Database

Pilarčík, L.; Wolf, M.; Dubovsky, P.A.; Hornoch, Kamil; Kotková, Lenka

2012-01-01

Roč. 539, March (2012), A153/1-A153/5 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : close binaries * eclipsing * star s Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

The Lyman Alpha Reference Sample. II. Hubble Space Telescope Imaging Results, Integrated Properties, and Trends

Czech Academy of Sciences Publication Activity Database

Hayes, M.; Ostlin, G.; Duval, F.; Sandberg, A.; Guaita, L.; Melinder, J.; Adamo, A.; Schaerer, D.; Verhamme, A.; Orlitová, Ivana; Mas-Hesse, J. M.; Cannon, J.M.; Atek, H.; Kunth, D.; Laursen, P.; Oti-Floranes, H.; Pardy, S.; Rivera-Thorsen, T.; Herenz, E.Ch.

2014-01-01

Roč. 782, č. 1 (2014), 6/1-6/22 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : cosmology: observations * galaxies: star burst Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.993, year: 2014

The Lyman Alpha Reference Sample: Extended Lyman Alpha Halos Produced at Low Dust Content

Czech Academy of Sciences Publication Activity Database

Hayes, M.; Oestlin, G.; Schaerer, D.; Verhamme, A.; Mas-Hesse, J. M.; Adamo, A.; Atek, H.; Cannon, J.M.; Duval, F.; Guaita, L.; Herenz, E.Ch.; Kunth, D.; Laursen, P.; Melinder, J.; Orlitová, Ivana; Oti-Floranes, H.; Sandberg, A.

2013-01-01

Roč. 765, č. 2 (2013), L27/1-L27/6 ISSN 2041-8205 Institutional support: RVO:67985815 Keywords : cosmology observations * galaxies * evolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.602, year: 2013

The value of ocean reflections of GPS signals to enhance satellite altimetry: data distribution and error analysis

Czech Academy of Sciences Publication Activity Database

Wagner, C.; Klokočník, Jaroslav

2003-01-01

Roč. 77, 3-4 (2003), s. 128-138 ISSN 0949-7714 Institutional research plan: CEZ:AV0Z1003909 Keywords : bistatic * satellite * altimetry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.983, year: 2003

Photometric observations of Earth-impacting asteroid 2008 TC(3)

Czech Academy of Sciences Publication Activity Database

Kozubal, M.; Gasdia, F.W.; Dantowitz, R.; Scheirich, Peter; Harris, A. W.

2011-01-01

Roč. 46, č. 4 (2011), s. 534-542 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : asteroid * photometric observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.719, year: 2011

Insights on the Stellar Mass-Metallicity Relation from the CALIFA Survey

Czech Academy of Sciences Publication Activity Database

Gonzalez Delgado, R.; Fernandes, R.C.; Garcia-Benito, R.; Pérez, E.; de Amorim, A.; Cortijo-Ferrero, C.; Lacerda, E.A.D.; Lopez Fernandez, R.; Sanchez, S.F.; Vale Asari, N.; Alves, J.; Bland-Hawthorn, J.; Galbany, L.; Gallazzi, A.; Husemann, B.; Bekeraite, S.; Jungwiert, Bruno; Lopez-Sanchez, A.R.; de Lorenzo-Caceres, A.; Marino, R.A.; Mast, D.; Molla, M.; del Olmo, A.; Sanchez-Blazquez, P.; van de Ven, G.; Vílchez, J.M.; Walcher, C.J.; Wisotzki, L.; Ziegler, B.

2014-01-01

Roč. 791, č. 1 (2014), L16/1-L16/5 ISSN 2041-8205 Institutional support: RVO:67985815 Keywords : galaxies * evolution * fundamental parameters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.339, year: 2014

The O-type eclipsing contact binary LY Aurigae - member of a quadruple system

Czech Academy of Sciences Publication Activity Database

Mayer, P.; Drechsel, H.; Harmanec, P.; Yang, S.; Šlechta, Miroslav

2013-01-01

Roč. 559, November (2013), A22/1-A22/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : early-type stars * binaries * eclipsing Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

MOND implications for spectral line profiles of shell galaxies: shell formation history and mass-velocity scaling relations

Czech Academy of Sciences Publication Activity Database

Bílek, Michal; Jungwiert, Bruno; Ebrová, Ivana; Bartošková, Kateřina

2015-01-01

Roč. 575, March (2015), A29/1-A29/8 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : galaxies * gravitation * kinematics and dynamic Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Eclipsing the innermost accretion disc regions in AGN

Czech Academy of Sciences Publication Activity Database

Sanfrutos, M.; Miniutti, G.; Dovčiak, Michal; Agis-Gonzalez, B.

2016-01-01

Roč. 337, 4-5 (2016), s. 546-551 ISSN 0004-6337 Institutional support: RVO:67985815 Keywords : accretion disks * black hole physics * relativistic effects Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.916, year: 2016

Comet C/2001 J1

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Helin, E.; Lawrence, K.; Kotková, Lenka; Tichá, J.; Tichý, M.

č. 7623 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet C/2001 A1 (Linear)

Czech Academy of Sciences Publication Activity Database

Blythe, M.; Dawson, M.; Kornos, L.; Koleny, P.; Kotková, Lenka; Tichá, J.; Tichý, M.

č. 7561 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet P/2001 Q5 (Linear-Neat)

Czech Academy of Sciences Publication Activity Database

Lawrence, K. J.; Helin, E. F.; Pravdo, S. H.; Spahr, T. B.; Tichý, M.; Kotková, Lenka; Galad, A.; Kalmančok, D.; Balam, D.; Shelus, P. J.

č. 7697 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet 2001 Q2

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Kušnirák, Peter; Bouma, R. J.; Raymundo, P. M.

č. 7687 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet C/2001 Q1 (Neat)

Czech Academy of Sciences Publication Activity Database

Lawrence, K. J.; Helin, E. F.; Pravdo, S. H.; Pravec, Petr; Kušnirák, Peter; Kočer, M.; Spahr, T. B.

č. 7685 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet P/2001 T3 (Neat)

Czech Academy of Sciences Publication Activity Database

Lawrence, K. J.; Pravdo, S. H.; Helin, E. F.; Pravec, Petr; Kušnirák, Peter; Tichá, J.; Tichý, M.; Jelínek, P.

č. 7733 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet P/2001 TU 80 (Linear-Neat)

Czech Academy of Sciences Publication Activity Database

Kušnirák, Peter

č. 7753 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet P/2001 MD 7 (Linear)

Czech Academy of Sciences Publication Activity Database

Blythe, M.; Kotková, Lenka; Marsden, B. G.

č. 7660 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet C/2001 A2 (Linear)

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Kotková, Lenka; Tichý, M.; Kočer, M.

č. 7564 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comet C/2001 Q6 (Neat)

Czech Academy of Sciences Publication Activity Database

Pravdo, S. H.; Helin, E. F.; Lawrence, K. J.; Tichý, M.; Kotková, Lenka; Wolf, M.; Balam, D.; Shelus, P. J.

č. 7698 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : comet s * astrometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

2001 OE 84

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Kušnirák, Peter

č. 7735 (2001), s. 1 ISSN 0081-0304 R&D Projects: GA ČR GA205/99/0255 Institutional research plan: CEZ:AV0Z1003909 Keywords : asteroids * monoliths * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The Extended Narrow-line Region of Two Type-I Quasi-stellar Objects

Czech Academy of Sciences Publication Activity Database

Oh, S.; Woo, J.-H.; Bennert, V.N.; Jungwiert, Bruno; Haas, M.; Leipski, C.; Albrecht, M.

2013-01-01

Roč. 767, č. 2 (2013), 117/1-117/7 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : active galaxies * quasars * emission lines Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.280, year: 2013

XXVIII. valné shromáždění Mezinárodní astronomické unie

Czech Academy of Sciences Publication Activity Database

Křížek, Michal

2013-01-01

Roč. 58, č. 1 (2013), s. 39-49 ISSN 0032-2423 Institutional support: RVO:67985840 Keywords : supernova * Friedmann equation * dark energy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics http://www.dml.cz/handle/10338.dmlcz/143257

Long-term stability of geoidal geopotential from Topex/Poseidon satellite altimetry 1993-1999

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Kenyon, S.; Kouba, J.; Müller, A.; Raděj, K.; Vatrt, V.; Vojtíšková, M.; Vítek, V.

2001-01-01

Roč. 84, - (2001), s. 163-176 ISSN 0167-9295 Institutional research plan: CEZ:AV0Z1003909 Keywords : geoidal geopotential * Topex/Poseidon altimetry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.457, year: 2001

Chemical abundances determined from meteor spetra. I. Rations of the main chemical clements

Czech Academy of Sciences Publication Activity Database

Trigo-Rodríguez, J.M.; Llorca, J.; Borovička, Jiří; Fabregat, J.

2003-01-01

Roč. 38, č. 8 (2003), s. 1283-1294 ISSN 0026-1114 Institutional research plan: CEZ:AV0Z1003909 Keywords : meteors * spectra * composition Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.992, year: 2003

Search for OH(A–X) and detection of N2+(B–X) in ultraviolet meteor spectrum

Czech Academy of Sciences Publication Activity Database

Abe, S.; Ebizuka, N.; Yano, H.; Watanabe, J.; Borovička, Jiří

2007-01-01

Roč. 39, č. 4 (2007), s. 538-543 ISSN 0273-1177 Institutional research plan: CEZ:AV0Z10030501 Keywords : astrobiology * comets * meteors Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.774, year: 2007

The Nova Rate in NGC 2403

Czech Academy of Sciences Publication Activity Database

Franck, J.R.; Shafter, A.W.; Hornoch, Kamil; Misselt, K.A.

2012-01-01

Roč. 760, č. 1 (2012), 13-1-13-8 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : galaxy NGC 2403 * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.733, year: 2012

Perspectives of observing the color indices of optical afterglows of gamma-ray bursts with ESA Gaia

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch; Hudec, R.; Pizzichini, G.

2017-01-01

Roč. 44, č. 1 (2017), s. 129-146 ISSN 0922-6435 Grant - others:GA ČR(CZ) GA13-33324S Institutional support: RVO:67985815 Keywords : radiation mechanisms * astronomical instrumentation * methods and techniques Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 2.313, year: 2016

On the Nature of Off-limb Flare Continuum Sources Detected by SDO/HMI

Czech Academy of Sciences Publication Activity Database

Heinzel, Petr; Kleint, L.; Kašparová, Jana; Krucker, S.

2017-01-01

Roč. 847, č. 1 (2017), 48/1-48/6 ISSN 0004-637X R&D Projects: GA ČR(CZ) GA16-18495S Institutional support: RVO:67985815 Keywords : Sun * chromosphere * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.533, year: 2016

An active state of the BL Lacertae object Markarian 421 detected by INTEGRAL in April 2013

Czech Academy of Sciences Publication Activity Database

Pian, E.; Tuerler, M.; Fiocchi, M.; Boissay, R.; Bazzano, A.; Foschini, L.; Tavecchio, F.; Bianchin, V.; Castignani, G.; Ferrigno, C.; Raiteri, C.M.; Villata, M.; Beckmann, V.; D'Ammando, F.; Hudec, René; Malaguti, G.; Maraschi, L.; Pursimo, T.; Romano, P.; Soldi, S.; Stamerra, A.; Treves, A.; Ubertini, P.; Vercellone, S.; Walter, R.

2014-01-01

Roč. 570, October (2014), A77/1-A77/9 ISSN 0004-6361 Grant - others:GA(CZ) GA102/09/0997 Institutional support: RVO:67985815 Keywords : log-parabolic spectra * xmm-newton observations * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 4.378, year: 2014

THE ATACAMA COSMOLOGY TELESCOPE: PHYSICAL PROPERTIES OF SUNYAEV-ZEL'DOVICH EFFECT CLUSTERS ON THE CELESTIAL EQUATOR ,

International Nuclear Information System (INIS)

Menanteau, Felipe; Hughes, John P.; Sifón, Cristóbal; Barrientos, L. Felipe; Dünner, Rolando; Infante, Leopoldo; Battaglia, Nicholas; Bond, J. Richard; Hajian, Amir; Hincks, Adam D.; Crichton, Devin; Gralla, Megan; Marriage, Tobias A.; Das, Sudeep; Devlin, Mark J.; Dicker, Simon; Hasselfield, Matthew; Hilton, Matt; Kosowsky, Arthur; Marsden, Danica

2013-01-01

We present the optical and X-ray properties of 68 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect at 148 GHz by the Atacama Cosmology Telescope (ACT). Our sample, from an area of 504 deg 2 centered on the celestial equator, is divided into two regions. The main region uses 270 deg 2 of the ACT survey that overlaps with the co-added ugriz imaging from the Sloan Digital Sky Survey (SDSS) over Stripe 82 plus additional near-infrared pointed observations with the Apache Point Observatory 3.5 m telescope. We confirm a total of 49 clusters to z ≈ 1.3, of which 22 (all at z > 0.55) are new discoveries. For the second region, the regular-depth SDSS imaging allows us to confirm 19 more clusters up to z ≈ 0.7, of which 10 systems are new. We present the optical richness, photometric redshifts, and separation between the SZ position and the brightest cluster galaxy (BCG). We find no significant offset between the cluster SZ centroid and BCG location and a weak correlation between optical richness and SZ-derived mass. We also present X-ray fluxes and luminosities from the ROSAT All Sky Survey which confirm that this is a massive sample. One of the newly discovered clusters, ACT-CL J0044.4+0113 at z = 1.1 (photometric), has an integrated XMM-Newton X-ray temperature of kT X = 7.9 ± 1.0 keV and combined mass of M 200a = 8.2 +3.3 –2.5 × 10 14 h –1 70 M ☉ , placing it among the most massive and X-ray-hot clusters known at redshifts beyond z = 1. We also highlight the optically rich cluster ACT-CL J2327.4–0204 (RCS2 2327) at z = 0.705 (spectroscopic) as the most significant detection of the whole equatorial sample with a Chandra-derived mass of M 200a = 1.9 +0.6 –0.4 × 10 15 h –1 70 M ☉ , placing it in the ranks of the most massive known clusters like El Gordo and the Bullet Cluster.

Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam

Czech Academy of Sciences Publication Activity Database

Bílek, Michal; Cuillandre, J.-C.; Gwyn, S.; Ebrová, Ivana; Bartošková, Kateřina; Jungwiert, Bruno; Jílková, L.

2016-01-01

Roč. 588, April (2016), A77/1-A77/12 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : elliptical and lenticular galaxies * peculiar * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Fragmentation model of meteoroid motion, mass loss, and radiation in the atmosphere

Czech Academy of Sciences Publication Activity Database

Ceplecha, Zdeněk; ReVelle, D.O.

2005-01-01

Roč. 40, č. 1 (2005), s. 35-54 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : luminous efficiency * innisfree meteorite Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.253, year: 2005

Inner disc obscuration in GRS 1915+105 based on relativistic slim disc model

Czech Academy of Sciences Publication Activity Database

Vierdayanti, K.; Sądowski, A.; Mineshige, L.S.; Bursa, Michal

2013-01-01

Roč. 436, č. 1 (2013), s. 71-81 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : accretion discs * black hole physics * GRS 1915+105 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.226, year: 2013

First detailed analysis of multiple system V2083 Cyg

Czech Academy of Sciences Publication Activity Database

Zasche, P.; Svoboda, P.; Šlechta, Miroslav

2012-01-01

Roč. 421, č. 2 (2012), s. 1196-1200 ISSN 0035-8711 Institutional research plan: CEZ:AV0Z10030501 Keywords : stars * binaries * fundamental parameters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.521, year: 2012

The Origin of Prolate Rotation in Dwarf Spheroidal Galaxies Formed by Mergers of Disky Dwarfs

Czech Academy of Sciences Publication Activity Database

Ebrová, Ivana; Lokas, E.

2015-01-01

Roč. 813, č. 1 (2015), 10/1-10/15 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : galaxies * fundamental parameters * kinematics and dynamics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.909, year: 2015

The historical 1900 and 1913 outbursts of the binary blazar candidate OJ287

Czech Academy of Sciences Publication Activity Database

Hudec, René; Bašta, M.; Pihajoki, P.; Valtonen, M.J.

2013-01-01

Roč. 559, October (2013), A20/1-A20/9 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : observational methods * OJ287 * photometric techniques Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

.xi. Tauri: a unique laboratory to study the dynamic interaction in a compact hierarchical quadruple system

Czech Academy of Sciences Publication Activity Database

Nemravová, J.; Harmanec, P.; Brož, M.; Vokrouhlický, D.; Mourard, D.; Hummel, C.A.; Cameron, C.; Matthews, J.M.; Bolton, C. T.; Božić, H.; Chini, R.; Dembsky, T.; Engle, S.; Farrington, C.D.; Grunhut, J.H.; Guenther, D.B.; Guinan, E. F.; Korčáková, D.; Koubský, Pavel; Křiček, R.; Kuschnig, R.; Mayer, P.; McCook, G.; Moffat, A.F.J.; Nardetto, N.; Prša, A.; Ribeiro, J.; Rowe, J.; Rucinski, S.M.; Škoda, Petr; Šlechta, Miroslav; Tallon-Bosc, I.; Votruba, Viktor; Weiss, W.W.; Wolf, M.; Zasche, P.; Zavala, R.T.

2016-01-01

Roč. 594, October (2016), A55/1-A55/47 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : close binaries * spectroscopic binaries * eclipsing binaries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

GRB 010220, optical observations

Czech Academy of Sciences Publication Activity Database

Castro-Tirado, A.J.; Castro Cerón, J.; Mateo Sanguino, T. J.; Hudec, René; Soldán, Jan; Páta, P.; Bernas, M.; Berná, J. A.; Corosabel, J.; de la Morena, B.; Torres Riera, J.

č. 957 (2001), s. 1 R&D Projects: GA AV ČR IAA3003206; GA MŠk ME 002 Institutional research plan: CEZ:AV0Z1003909 Keywords : gamma-ray bursts Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Evidence of the Evolved Nature of the B[e] Star MWC 137

Czech Academy of Sciences Publication Activity Database

Muratore, M.F.; Kraus, Michaela; Oksala, Mary E.; Arias, M.L.; Cidale, L.S.; Borges Fernandes, M.; Liermann, A.

2015-01-01

Roč. 149, č. 1 (2015), 13/1-13/9 ISSN 0004-6256 Institutional support: RVO:67985815 Keywords : circumstellar matter * early-type stars * emission-line Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.617, year: 2015

New Eyes Looking at Solar Activity: Challenges for Theory and Simulations - Placing It into Context

Czech Academy of Sciences Publication Activity Database

Pohjolainen, S.; Karlický, Marian; van Driel-Gesztelyi, L.; Mandrini, C.H.

2015-01-01

Roč. 290, č. 1 (2015), s. 1-5 ISSN 0038-0938 Institutional support: RVO:67985815 Keywords : solar radio physics * solar processes * new observational capabilities Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.862, year: 2015

Spectroscopic analysis in the virtual observatory environment with SPLAT-VO

Czech Academy of Sciences Publication Activity Database

Škoda, Petr; Draper, P.; Neves, M.C.; Andrešič, D.; Jenness, T.

7–8, November–December (2014), s. 108-120 ISSN 2213-1337 R&D Projects: GA ČR GA13-08195S Institutional support: RVO:67985815 Keywords : spectral analysis * virtual observatory Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Reply to van Hoesel et al.: Impact-related Younger Dryas boundary nanodiamonds from The Netherlands

Czech Academy of Sciences Publication Activity Database

Wittke, J. H.; Bunch, T. E.; Kennett, J. P.; Culleton, B. L.; Tankersley, K. B.; Daniel,, I. R., Jr.; Kloosterman, J. B.; Kletetschka, Günther; West, A.; Firestone, R. B.

2013-01-01

Roč. 110, č. 41 (2013), E3897-E3898 ISSN 0027-8424 Institutional support: RVO:67985831 Keywords : nanodiamonds * Clovis * radiocarbon dates * impact * Arlington Canyon Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 9.809, year: 2013

Solar radio bursts with spectral fine structures in preflares

Czech Academy of Sciences Publication Activity Database

Zhang, J.; Tan, B.-L.; Karlický, Marian; Mészárosová, Hana; Huang, J.; Tan, C.M.; Simoes, P.J.A.

2015-01-01

Roč. 799, č. 1 (2015), 30/1-30/13 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : Sun corona * Sun flares * radio radiation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.909, year: 2015

Nanophase iron production through laser irradiation and magnetic detection of space weathering analogs

Czech Academy of Sciences Publication Activity Database

Markley, M.; Kletetschka, Günther

2016-01-01

Roč. 268, April (2016), s. 204-214 ISSN 0019-1035 Institutional support: RVO:67985831 Keywords : experimental techniques asteroids * surfaces Mercury * surface Moon * surface spectroscopy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.131, year: 2016

Electron Acceleration by Cascading Reconnection in the Solar Corona. II. Resistive Electric Field Effects

Czech Academy of Sciences Publication Activity Database

Zhou, X.; Büchner, J.; Bárta, Miroslav; Gan, W.; Liu, S.

2016-01-01

Roč. 827, č. 2 (2016), 94/1-94/14 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : acceleration of particles * magnetic reconnection * magnetohydrodynamics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

Electron Acceleration by Cascading Reconnection in the Solar Corona. I. Magnetic Gradient and Curvature Drift Effects

Czech Academy of Sciences Publication Activity Database

Zhou, X.; Büchner, J.; Bárta, Miroslav; Gan, W.; Liu, S.

2015-01-01

Roč. 815, č. 1 (2015), 6/1-6/17 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : acceleration of particles * magnetic reconnection * magnetohydrodynamics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.909, year: 2015

HI shells in the outer Milky Way

Czech Academy of Sciences Publication Activity Database

Ehlerová, Soňa; Palouš, Jan

2005-01-01

Roč. 437, č. 1 (2005), s. 101-112 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z1003909 Keywords : ISM * bubbles * galaxy structure Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.223, year: 2005

The DEMETER Science Mission Centre

Czech Academy of Sciences Publication Activity Database

Lagoutte, D.; Brochot, J.; Y.; de Carvalho, D.; Elie, F.; Harivelo, F.; Hobara, Y.; Madrias, L.; Parrot, M.; Pincon, J. L.; Berthelier, J. J.; Peschard, D.; Seran, E.; Gangloff, M.; Sauvaud, J. A.; Lebreton, J. P.; Štverák, Štěpán; Trávníček, Pavel M.; Grygorczuk, J.; Slominski, J.; Wronowski, R.; Barbier, S.; Bernard, P.; Gaboriaud, A.; Wallut, J. M.

2006-01-01

Roč. 54, č. 5 (2006), s. 428-440 ISSN 0032-0633 Institutional research plan: CEZ:AV0Z30420517 Keywords : Mission Centre * Data processing Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.509, year: 2006

Probing Sagittarius A* and its environment at the Galactic centre: VLT and APEX working in synergy

Czech Academy of Sciences Publication Activity Database

Eckart, A.; Schödel, R.; García-Marín, M.; Witzel, G.; Weiss, A.; Baganoff, F. K.; Morris, M.; Bertram, T.; Dovčiak, Michal; Downes, D.; Duschl, W.J.; Karas, Vladimír; Koenig, S.; Krichbaum, T.P.; Krips, M.; Kunneriath, D.; Lu, R.-S.; Markoff, S. B.; Mauerhan, J.; Meyer, L.; Moultaka, J.; Muzic, K.; Najarro, F.; Pott, J.-U.; Schuster, K.; Sjouwerman, L.; Straubmeier, C.; Thum, C.; Vogel, S.; Wiesemeyer, H.; Zamaninasab, M.; Zensus, A.

2008-01-01

Roč. 133, - (2008), s. 26-30 ISSN 0722-6691 R&D Projects: GA MŠk(CZ) LC06014 Institutional research plan: CEZ:AV0Z10030501 Keywords : astrophsysics * galactic centre Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Discovery, photometry, and astrometry of 49 classical nova candidates in M81 galaxy

Czech Academy of Sciences Publication Activity Database

Hornoch, Kamil; Scheirich, Peter; Garnavich, P.M.; Hameed, S.; Thilker, D. A.

2008-01-01

Roč. 492, č. 1 (2008), s. 301-317 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : M81 galaxy * novae Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.153, year: 2008

Observed IRIS Profiles of the h and k Doublet of Mg II and Comparison with Profiles from Quiescent Prominence NLTE Models

Czech Academy of Sciences Publication Activity Database

Vial, J. C.; Pelouze, G.; Heinzel, Petr; Kleint, L.; Anzer, U.

2016-01-01

Roč. 291, č. 1 (2016), s. 67-87 ISSN 0038-0938 Institutional support: RVO:67985815 Keywords : Mg II lines * non-LTE diagnostic * Sun prominences Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.682, year: 2016

o Puppis: another Be plus sdO binary?

Czech Academy of Sciences Publication Activity Database

Koubský, Pavel; Kotková, Lenka; Votruba, Viktor; Šlechta, Miroslav; Dvořáková, Š.

2012-01-01

Roč. 545, September (2012), A121/1-A121/4 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : spectroscopic techniques * emission -line * Be stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

The Morávka meteorite fall. 3. Meteoriod initial size, history, structure, and composition

Czech Academy of Sciences Publication Activity Database

Borovička, Jiří; Weber, H. W.; Jopek, T.; Jakeš, P.; Brown, P. G.; ReVelle, D.O.; Kalenda, P.; Schultz, L.; Kučera, J.; Haloda, J.; Týcová, P.; Frýda, J.; Brandstätter, F.

2003-01-01

Roč. 38, č. 7 (2003), s. 1005-1021 ISSN 0026-1114 Institutional research plan: CEZ:AV0Z1003909 Keywords : meteorites * orbits * noble gases Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.992, year: 2003

The 2014 ALMA Long Baseline Campaign: An Overview

Czech Academy of Sciences Publication Activity Database

Fomalont, E.B.; Vlahakis, C.; Corder, S.; Remijan, A.; Barkats, D.; Lucas, R.; Hunter, T.R.; Brogan, C.L.; Asaki, Y.; Matsushita, S.; Dent, W.R.F.; Hills, R.E.; Phillips, N.; Richards, A.M.S.; Cox, P.; Amestica, R.; Broguiere, D.; Cotton, W.; Hales, A.S.; Hiriart, R.; Hirota, A.; Hodge, J.A.; Impellizzeri, C.M.V.; Kern, J.; Kneissl, R.; Liuzzo, E.; Marcelino, N.; Marson, R.; Mignano, A.; Nakanishi, K.; Nikolic, B.; Perez, J.E.; Perez, L.M.; Toledo, I.; Bárta, Miroslav; Jáchym, Pavel; Karlický, Marian; Kraus, Michaela; Kunneriath, Devaky

2015-01-01

Roč. 808, č. 1 (2015), L1/1-L1/11 ISSN 2041-8205 Institutional support: RVO:67985815 Keywords : interferometers * submillimeter * high angular resolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.487, year: 2015

Multi-wavelength observations of Asteroid 2100 Ra-Shalom

Czech Academy of Sciences Publication Activity Database

Shepard, M.K.; Clark, B. E.; Nolan, M. C.; Benner, L. A. M.; Ostro, S. J.; Giorgini, J. D.; Vilas, F.; Jarvis, K.; Lederer, S.; Lim, L.F.; McConnochie, T.; Bell, J.; Margot, J. L.; Rivkin, A. S.; Magrik, C.; Scheeres, D.J.; Pravec, Petr

2008-01-01

Roč. 193, č. 1 (2008), s. 20-38 ISSN 0019-1035 Institutional research plan: CEZ:AV0Z10030501 Keywords : asteroids composition * radar observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.268, year: 2008

Earth's dimension specified by geoidal geopotential

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Groten, E.; Kenyon, S.; Kouba, J.; Raděj, K.; Vatra, V.; Vojtíšková, M.

2002-01-01

Roč. 46, č. 1 (2002), s. 1-8 ISSN 0039-3169 Institutional research plan: CEZ:AV0Z1003909 Keywords : TOPEX/POSEIDON satellite * analyse Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.571, year: 2002

Quantitative model of the release of sodium from meteoroids in the vicinity of the Sun: Application to Geminids

Czech Academy of Sciences Publication Activity Database

Čapek, David; Borovička, Jiří

2009-01-01

Roč. 202, č. 2 (2009), s. 361-370 ISSN 0019-1035 Institutional research plan: CEZ:AV0Z10030501 Keywords : meteors * interplanetary dust * mineralogy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.340, year: 2009

Second-degree Stokes coefficients from multi-satellite SLR

Czech Academy of Sciences Publication Activity Database

Blossfeld, M.; Mueller, H.; Gerstl, M.; Štefka, Vojtěch; Bouman, J.; Goettl, F.; Horwath, M.

2015-01-01

Roč. 89, č. 9 (2015), s. 857-871 ISSN 0949-7714 Institutional support: RVO:67985815 Keywords : multi-satellite SLR * stokes coefficients * equatorial excitation functions Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.486, year: 2015

Multiwavelength Analysis of the Impact Polarization of 2001 June 15 Solar Flare

Czech Academy of Sciences Publication Activity Database

Xu, Z.; Hénoux, J.C.; Chambe, G.; Karlický, Marian; Fang, C.

2005-01-01

Roč. 631, č. 1 (2005), s. 618-627 ISSN 0004-637X Institutional research plan: CEZ:AV0Z1003909 Keywords : Sun * polarization * flares Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.308, year: 2005

Proč je obvod Slunce menší než 2pi r?

Czech Academy of Sciences Publication Activity Database

Křížek, Michal

2017-01-01

Roč. 46, č. 3 (2017), s. 7-18 ISSN 1335-4981 Institutional support: RVO:67985840 Keywords : interior Schwarzschild metrie * proper radius * coordinate radius Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science)

Vliv sluneční aktivity na poruchy v české rozvodné síti: předběžné hodnocení

Czech Academy of Sciences Publication Activity Database

Výbošťoková, T.; Švanda, Michal

2017-01-01

Roč. 62, č. 3 (2017), s. 202-212 ISSN 0032-2423 Institutional support: RVO:67985815 Keywords : Sun- Earth relations * geomagnetic activity * electrical powergrids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science)

Extended Submillimeter Emission of the Galactic Center and Near-infrared/submillimeter Variability of Its Supermassive Black Hole

Czech Academy of Sciences Publication Activity Database

García-Marín, M.; Eckart, A.; Weiss, A.; Witzel, G.; Bremer, M.; Zamaninasab, M.; Morris, M.; Schoedel, R.; Kunneriath, Devaky; Nishiyama, S.; Baganoff, F. K.; Dovčiak, Michal; Sabha, N.; Duschl, W.J.; Moultaka, J.; Karas, Vladimír; Najarro, F.; Muzic, K.; Straubmeier, C.; Vogel, S. N.; Krips, M.; Wiesemeyer, H.

2011-01-01

Roč. 738, č. 2 (2011), 158/1-158/19 ISSN 0004-637X Institutional research plan: CEZ:AV0Z10030501 Keywords : galactic centre Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.024, year: 2011

A Fossil Bulge Globular Cluster Revealed by very Large Telescope Multi-conjugate Adaptive Optics

Czech Academy of Sciences Publication Activity Database

Ortolani, S.; Barbuy, B.; Momany, Y.; Saviane, I.; Bica, E.; Jílková, L.; Salerno, G.M.; Jungwiert, Bruno

2011-01-01

Roč. 737, č. 1 (2011), 31/1-31/9 ISSN 0004-637X Institutional research plan: CEZ:AV0Z10030501 Keywords : galaxy * globular clusters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.024, year: 2011

CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey

Czech Academy of Sciences Publication Activity Database

Walcher, C.J.; Wisotzki, L.; Bekeraite, S.; Husemann, B.; Iglesias-Paramo, J.; Backsmann, N.; Barrera-Ballesteros, J.; Catalán-Torrecilla, C.; Cortijo-Ferrero, C.; del Olmo, A.; Garcia Lorenzo, B.; Falcon-Barroso, J.; Jílková, J.; Kalinová, V.; Mast, D.; Marino, R.A.; Méndez-Abreu, J.; Pasqual, A.; Sanchez, S.F.; Trager, S.; Zibetti, S.; Aguerri, J.A.L.; Alves, J.; Bland-Hawthorn, J.; Boselli, A.; Castillo-Morales, A.; Fernandes, R.C.; Flores, H.; Galbany, L.; Gallazzi, A.; Garcia-Benito, R.; Gil de Paz, A.; Gonzalez Delgado, R.; Jahnke, K.; Jungwiert, Bruno

2014-01-01

Roč. 569, September (2014), A1/1-A1/18 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : surveys * digital sky survey * active galactic nuclei Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Automatic detection of white-light flare kernels in SDO/HMI intensitygrams

Czech Academy of Sciences Publication Activity Database

Mravcová, L.; Švanda, Michal

2017-01-01

Roč. 57, November (2017), s. 14-21 ISSN 1384-1076 Institutional support: RVO:67985815 Keywords : Sun * activity * flares Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 0.938, year: 2016

Vliv oceánských slapů na nízké oběžné dráhy družic Země

Czech Academy of Sciences Publication Activity Database

Štěpánek, P.; Bezděk, Aleš

2013-01-01

Roč. 59, č. 5 (2013), s. 89-99 ISSN 0016-7096 Grant - others:GA(CZ) GCP209/11/J082 Institutional support: RVO:67985815 Keywords : SPOT-5 * Jason-2 * perturbation forces Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Recurrent Novae in M31

Czech Academy of Sciences Publication Activity Database

Shafter, A.W.; Henze, M.; Rector, T. A.; Schweizer, F.; Hornoch, Kamil; Orio, M.; Pietsch, W.; Darnley, M.J.; Williams, S.C.; Bode, M.F.; Bryan, J.

2015-01-01

Roč. 216, č. 2 (2015), 34/1-34/35 ISSN 0067-0049 Institutional support: RVO:67985815 Keywords : individual (M31) galaxies * stellar content * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 11.257, year: 2015

The Lyman Alpha Reference Sample. III. Properties of the Neutral ISM from GBT and VLA Observations

Czech Academy of Sciences Publication Activity Database

Pardy, S.; Cannon, J.M.; Ostlin, G.; Hayes, M.; Rivera-Thorsen, T.; Sandberg, A.; Adamo, A.; Freeland, E.; Herenz, E.Ch.; Guaita, L.; Kunth, D.; Laursen, P.; Mas-Hesse, J. M.; Melinder, J.; Orlitová, Ivana; Oti-Floranes, H.; Puschnig, J.; Schaerer, D.; Verhamme, A.

2014-01-01

Roč. 794, č. 2 (2014), 101/1-101/19 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : galaxies: ISM * kinematics and dynamics * star burst Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.993, year: 2014

M31N 2008-12a - The Remarkable Recurrent Nova in M31: Panchromatic Observations of the 2015 Eruption

Czech Academy of Sciences Publication Activity Database

Darnley, M.J.; Henze, M.; Bode, M.F.; Haciusu, I.; Hernanz, M.; Hornoch, Kamil; Hounsell, R.; Kato, M.; Ness, J.-U.; Osborne, J.P.

2016-01-01

Roč. 833, č. 2 (2016), 149/1-149/38 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : individual galaxies * novae cataclysmic variables * individual stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

Optical Spectroscopy with the Technology of Virtual Observatory

Czech Academy of Sciences Publication Activity Database

Škoda, Petr

2011-01-01

Roč. 20, č. 4 (2011), s. 531-539 ISSN 1392-0049 Institutional research plan: CEZ:AV0Z10030501 Keywords : virtual observatories * surveys * spectroscopic techniques Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.444, year: 2011

Magnetic anomalies on Mars are deep seated

Czech Academy of Sciences Publication Activity Database

Essa, K. S.; Kletetschka, Günther

2015-01-01

Roč. 50, Supplement 1 SI (2015) ISSN 1086-9379. [Annual Meeting of the Meteoritical Society /78./. 27.07.2015-31.07.2015, Berkeley] Institutional support: RVO:67985831 Keywords : field * crust * Mars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption

Czech Academy of Sciences Publication Activity Database

Darnley, M.J.; Henze, M.; Steele, I.A.; Bode, M.F.; Ribeiro, V.A.R.M.; Rodriguez-Gil, P.; Shafter, A.W.; Williams, S.C.; Baer, D.; Hachisu, I.; Hernanz, M.; Hornoch, Kamil; Hounsell, R.A.; Kato, M.; Kiyota, S.; Kučáková, Hana; Maehara, H.; Ness, J.-U.; Piascik, A.S.; Sala, G.; Skillen, I.; Smith, R. J.; Wolf, M.

2015-01-01

Roč. 580, August (2015), A45/1-A45/23 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : individual (M31) galaxies * novae * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Limits on optical polarization duringt the prompt phase of GRB 140430a

Czech Academy of Sciences Publication Activity Database

Kopač, D.; Mundell, C. G.; Japelj, J.; Arnold, D. M.; Steele, I.A.; Guidorzi, C.; Dichiara, S.; Kobayashi, S.; Gomboc, A.; Harrison, R. M.; Lamb, G. P.; Melandri, A.; Smith, R. J.; Virgili, F. J.; Castro-Tirado, A.J.; Gorosabel, J.; Järvinen, A.; Sánchez-Ramírez, R.; Oates, S.R.; Jelínek, Martin

2015-01-01

Roč. 813, č. 1 (2015), 1/1-1/14 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : gamma-ray burst * GRB 140430A * polarimeters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.909, year: 2015

Influence of seeing effects on cloud model inversions

Czech Academy of Sciences Publication Activity Database

Tziotziou, K.; Heinzel, Petr; Tsiropoula, G.

2007-01-01

Roč. 472, č. 1 (2007), s. 287-292 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : cloud model * inversions * seeing effects Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.259, year: 2007

Dating of Mayan Calendar using Long-periodic Astronomical Phenomena in Dresden Codexical Phenomena in Dresden Codex

Czech Academy of Sciences Publication Activity Database

Böhm, V.; Böhm, B.; Klokočník, Jaroslav; Vondrák, Jan; Kostelecký, J.

-, č. 186 (2013), s. 53-64 ISSN 1450-698X Institutional research plan: CEZ:AV0Z10030501 Institutional support: RVO:67985815 Keywords : ephemerides * eclipses * time Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.100, year: 2013

The Morávka meteorite fall. 2. Interpretation of infrasonic and seismic data

Czech Academy of Sciences Publication Activity Database

Brown, P. G.; Kalenda, P.; ReVelle, D.O.; Borovička, Jiří

2003-01-01

Roč. 38, č. 7 (2003), s. 989-1003 ISSN 0026-1114 Institutional research plan: CEZ:AV0Z1003909 Keywords : meteors * acustic effects * seismic waves Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.992, year: 2003

The first two transient supersoft X-ray sources in M 31 globular clusters and the connection to classical novae

Czech Academy of Sciences Publication Activity Database

Henze, M.; Pietsch, W.; Haberl, F.; Sala, G.; Quimby, R.; Hernanz, M.; Della Valle, M.; Milne, P.; Williams, G.G.; Burwitz, V.; Greiner, J.; Stiele, H.; Hartmann, D. H.; Kong, A. K. H.; Hornoch, Kamil

2009-01-01

Roč. 500, č. 2 (2009), s. 769-779 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : M 31 * novae * globular clusters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.179, year: 2009

K-band polarimetry of an Sgr A* flare with a clear sub-flare structure

Czech Academy of Sciences Publication Activity Database

Meyer, L.; Schödel, R.; Eckart, A.; Karas, Vladimír; Dovčiak, Michal; Duschl, W.J.

2006-01-01

Roč. 458, č. 2 (2006), L25-L28 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : black hole physics * polarimetry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.971, year: 2006

Assessment of Systematic Errors in the Computation of Gravity Gradients from Satellite Altimeter Data

Czech Academy of Sciences Publication Activity Database

Bouman, J.; Bosch, W.; Sebera, Josef

2011-01-01

Roč. 34, č. 2 (2011), s. 85-107 ISSN 0149-0419 Institutional research plan: CEZ:AV0Z10030501 Keywords : satellite altimetry * gravity gradients * GOCE Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.329, year: 2011

Supersoft X-rays reveal a classical nova in the M 31 globular cluster Bol 126

Czech Academy of Sciences Publication Activity Database

Henze, M.; Pietsch, W.; Haberl, F.; Della Valle, M.; Riffeser, A.; Salla, G.; Hatzidimitriou, D.; Hofmann, F.; Hartmann, D.H.; Koppenhoefer, J.; Seitz, S.; Williams, G.; Hornoch, Kamil; Itagaki, K.; Kabashima, F.; Nishiyama, K.; Xing, G.; Lee, C.H.; Magnier, E.; Chambers, K.

2013-01-01

Roč. 549, January (2013), A120/1-A120/15 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : galaxies individual M 31 * novae * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

Extreme warm absorber variability in the Seyfert galaxy Mrk 704

Czech Academy of Sciences Publication Activity Database

Matt, G.; Bianchi, S.; Guainazzi, M.; Longinotti, A. L.; Dadina, M.; Karas, Vladimír; Malaguti, G.; Miniutti, G.; Petrucci, P. O.; Piconcelli, E.; Ponti, G.

Roč. 533, September (2011), A1/1-A1/9 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : active galactic nuclei Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.587, year: 2011

Physical characteristics of the binary PHA 2003 YT1

Czech Academy of Sciences Publication Activity Database

Larson, S. M.; Grauer, A. D.; Beshore, E.; Christensen, E.; Pravec, Petr; Kaasalainen, M.; Nolan, M. C.; Howell, E. S.; Hine, A. A.; Galád, Adrián; Gajdoš, Š.; Kornoš, L.; Világi, J.

2004-01-01

Roč. 36, č. 4 (2004), s. 1139 ISSN 0002-7537 R&D Projects: GA AV ČR IAA3003204 Institutional research plan: CEZ:AV0Z1003909 Keywords : binary * asteroids * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

OMC: an optical monitoring camera for INTEGRAL

Czech Academy of Sciences Publication Activity Database

Mas-Hesse, J. M.; Giménez, A.; Culhane, J. L.; Jamar, C.; McBreen, B.; Torra, J.; Hudec, René; Fabregat, J.; Meurs, E.; Swings, J. P.; Alcacera, M. A.; Balado, A.; Beiztegui, R.; Belenguer, T.; Bradley, L.; Caballero, M. D.; Cabo, P.; Defise, J. M.; Díaz, E.; Domingo, A.; Figueras, F.; Figueroa, I.; Hanlon, L.; Hroch, Filip; Hudcová, Věra; García, T.; Jordan, B.; Jordi, C.; Kretschmar, P.; Laviada, C.; March, M.; Martín, E.; Mazy, E.; Menéndez, M.; Mi, J. M.; de Miguel, E.; Munoz, T.; Nolan, K.; Olmedo, R.; Pesseria, J. Y.; Polcar, Jiří; Reina, M.; Renotte, E.; Rochus, P.; Sánchez, A.; San Martín, J. C.; Smith, A.; Soldán, Jan; Thomas, P.; Timón, V.; Walton, D. J.

2003-01-01

Roč. 411, č. 1 (2003), L261-L268 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z1003909 Keywords : photometers instrumentation * stars * photometric Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.843, year: 2003

Very low strengths of interplanetary meteoroids and small asteroids

Czech Academy of Sciences Publication Activity Database

Popova, O. P.; Borovička, Jiří; Hartman, W.K.; Spurný, Pavel; Gnos, E.; Nemtchinov, I. V.; Trigo-Rodríguez, J.M.

2011-01-01

Roč. 46, č. 10 (2011), s. 1525-1550 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : meteoroids * small asteroids * photographic observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.719, year: 2011

On computing ellipsoidal harmonics using Jekeli's renormalization

Czech Academy of Sciences Publication Activity Database

Sebera, Josef; Bouman, J.; Bosch, W.

2012-01-01

Roč. 86, č. 9 (2012), s. 713-726 ISSN 0949-7714 Institutional support: RVO:67985815 Keywords : Earth's gravitational field * spherical and ellipsoidal harmonics * hypergeometric function Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.808, year: 2012

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Indian Academy of Sciences (India)

such an effect, because the plane of the moon's orbit turns once in about eighteen ... Dividing by zero is bad. Dividing ... instituted for the best solution 3. Poincare's ... Nouvelles de la Mecanique Celeste' (New methods of Celestial. Mechanics) ...

Cosmic-ray exposure age and preatmospheric size of the Bunburra Rockhole achondrite

Czech Academy of Sciences Publication Activity Database

Welten, K.C.; Meier, M.M.M.; Caffee, M. W.; Laubenstein, M.; Nishizumi, K.; Wieler, R.; Bland, P.A.; Towner, M.C.; Spurný, Pavel

2012-01-01

Roč. 47, č. 2 (2012), s. 186-196 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z10030501 Keywords : Bunburra Rockhole * achondrites * parent bodies. Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.800, year: 2012

The spectroscopic evolution of the symbiotic star AG Draconis I. The O VI Raman, Balmer, and helium emission line variations during the outburst of 2006-2008

Czech Academy of Sciences Publication Activity Database

Shore, S. N.; Wahlgren, G.M.; Genovali, K.; Bernabei, S.; Koubský, Pavel; Šlechta, Miroslav; Škoda, Petr; Skopal, A.; Wolf, M.

2010-01-01

Roč. 510, February (2010), A70/1-A70/10 ISSN 0004-6361 Grant - others:ESA(XE) ESA- PECS Project No. 98058; Vega(SK) 2/7010/27 Institutional research plan: CEZ:AV0Z10030501 Keywords : AG Draconis * radiation mechanisms * atomic processes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.410, year: 2010

Testing wind as an explanation for the spin problem in the continuum-fitting method

Czech Academy of Sciences Publication Activity Database

You, B.; Straub, O.; Czerny, B.; Sobolewska, M.; Rózanska, A.; Bursa, Michal; Dovčiak, Michal

2016-01-01

Roč. 821, č. 2 (2016), 104/1-104/15 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : accretion disks * black hole physics * X-rays binaries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.533, year: 2016

Magnetic Neutral Points and Electric Lines of Force in Strong Gravity of a Rotating Black Hole

Czech Academy of Sciences Publication Activity Database

Karas, Vladimír; Kopáček, Ondřej; Kunneriath, Devaky

2013-01-01

Roč. 3, 3A (2013), s. 18-24 ISSN 2161-4717 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : galaxies * nuclei * black hole physics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign. II. Evidence of a binary - possibly triple - system

Czech Academy of Sciences Publication Activity Database

Fauvaud, S.; Sareyan, J.P.; Ribas, I.; Rodriguez, E.; Lampens, P.; Klingenberg, G.; Farrell, J.A.; Fumagalli, F.; Simonetti, J.H.; Wolf, M.; Santacana, G.; Zhou, A.; Michel, R.; Fox-Machado, L.; Alvarez, M.; Nava-Vega, A.; Lopez-Gonzalez, M.J.; Casanova, V.M.; Aceituno, F.J.; Scheggia, I.; Rives, J.-J.; Hintz, E.G.; Van Cauteren, P.; Helvaci, M.; Yesilyaprak, C.; Graham, K.A.; Král, L.; Kocián, R.; Kučáková, Hana; Fauvaud, M.; Granslo, B.H.; Michelet, J.; Nicholson, M.P.; Vugnon, J.-M.; Kotková, Lenka; Truparova, K.; Ulusoy, G.; Yasarsoy, B.; Avdibegovic, A.; Blazek, M.; Kliner, J.; Zasche, P.; Bartosikova, S.; Vilasek, M.; Trondal, O.; Van Den Abbeel, F.; Behrend, R.; Wuecher, H.

2010-01-01

Roč. 515, June (2010), A39/1-A39/7 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : variables stars * BL Camelopardalis * oscillations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.410, year: 2010

Chemical evolution of high-mass stars in close binaries. II. The evolved component of the eclipsing binary V380 Cygni

Czech Academy of Sciences Publication Activity Database

Pavlovski, K.; Tamajo, E.; Koubský, Pavel; Southworth, J.; Yang, S.; Kolbas, V.

2009-01-01

Roč. 400, č. 2 (2009), s. 791-804 ISSN 0035-8711 Institutional research plan: CEZ:AV0Z10030501 Keywords : binaries star s * eclipsing * fundamental parameters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.103, year: 2009

Firehose constraints of the bi-Kappa-distributed electrons: a zero-order approach for the suprathermal electrons in the solar wind

Czech Academy of Sciences Publication Activity Database

Lazar, M.; Shaaban, S. M.; Poedts, S.; Štverák, Štěpán

2017-01-01

Roč. 464, č. 1 (2017), s. 564-571 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : instabilities * plasmas * analytical methods Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 4.961, year: 2016

Unique sextuple system: 65 Ursae Majoris

Czech Academy of Sciences Publication Activity Database

Zasche, P.; Uhlář, R.; Šlechta, Miroslav; Wolf, M.; Harmanec, P.; Nemravová, J.; Korčáková, D.

2012-01-01

Roč. 542, June (2012), A78/1-A78/6 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : stars * eclipsing * fundamental parameters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

Spectral and photometric analysis of the eclipsing binary epsilon Aurigae prior to and during the 2009-2011 eclipse

Czech Academy of Sciences Publication Activity Database

Chadima, P.; Harmanec, P.; Bennett, P.D.; Kloppenborg, B.; Stencel, R.; Yang, S.; Božić, H.; Šlechta, Miroslav; Kotková, Lenka; Wolf, M.; Škoda, Petr; Votruba, Viktor; Hopkins, J.L.; Buil, C.; Sudar, D.

2011-01-01

Roč. 530, June (2011), A146/1-A146/13 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : variables stars * binaries * eclipsing Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.587, year: 2011

Optical replication techniques for image slicers

Czech Academy of Sciences Publication Activity Database

Schmoll, J.; Robertson, D.J.; Dubbeldam, C.M.; Bortoletto, F.; Pína, L.; Hudec, René; Prieto, E.; Norrie, C.; Ramsay- Howat, S.

2006-01-01

Roč. 50, 4-5 (2006), s. 263-266 ISSN 1387-6473 Institutional research plan: CEZ:AV0Z10030501 Keywords : smart focal planes * image slicers * replication Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.914, year: 2006

Report of the International Astronomical Union Division I working group on precession and the ecliptic

Czech Academy of Sciences Publication Activity Database

Hilton, J. L.; Capitaine, N.; Chapront, J.; Ferrandiz, J.M.; Fienga, A.; Fukushima, T.; Getino, J.; Mathews, P. M.; Simon, J.-C.; Soffel, M.; Vondrák, Jan; Wallace, P.; Williams, J.

2006-01-01

Roč. 94, č. 3 (2006), s. 351-367 ISSN 0923-2958 Institutional research plan: CEZ:AV0Z10030501 Keywords : precession and the ecliptic * reference systems Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.175, year: 2006

Fueling QSOs: the relevance of mergers

Czech Academy of Sciences Publication Activity Database

Bennert, N.; Canalizo, G.; Jungwiert, Bruno; Stockton, A.; Schweizer, F.; Peng, Ch.; Lacy, M.

2008-01-01

Roč. 79, č. 4 (2008), s. 1247-1250 ISSN 0037-8720 R&D Projects: GA MŠk(CZ) LC06014 Institutional research plan: CEZ:AV0Z10030501 Keywords : galaxy mergers * quasars * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Mg II Lines Observed During the X-class Flare on 29 March 2014 by the Interface Region Imaging Spectrograph

Czech Academy of Sciences Publication Activity Database

Liu, Wenjuan; Heinzel, Petr; Klient, L.; Kašparová, Jana

2015-01-01

Roč. 290, č. 12 (2015), s. 3525-3543 ISSN 0038-0938 Grant - others:EC(XE) 606862 Program:FP7 Institutional support: RVO:67985815 Keywords : flares * spectrum * dynamics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.862, year: 2015

Nonthermal and thermal diagnostics of a solar flare observed with RESIK and RHESSI

Czech Academy of Sciences Publication Activity Database

Dzifčáková, Elena; Kulinová, Alena; Chifor, C.; Mason, H. E.; Del Zanna, G.; Sylwester, J.; Sylwester, B.

2008-01-01

Roč. 488, č. 1 (2008), s. 311-321 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun flares * X-rays * gamma rays Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.153, year: 2008

Supershells: origin, evolution and fragmentation

Czech Academy of Sciences Publication Activity Database

Palouš, Jan; Ehlerová, Soňa

2000-01-01

Roč. 44, - (2000), s. 369-373 ISSN 1387-6473 R&D Projects: GA ČR GA205/97/0699; GA AV ČR KSK1003601 Institutional research plan: CEZ:AV0Z1003909 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Pluto's Atmosphere from the 2015 June 29 Ground-Based Stellar Occultation at the Time of the New Horizons Flyby

Czech Academy of Sciences Publication Activity Database

Sicardy, B.; Talbot, J.; Meza, E.; Camargo, J.I.B.; Desmars, J.; Gault, D.; Herald, D.; Kerr, S.; Pavlov, H.; Braga-Ribas, F.; Jelínek, Martin

2016-01-01

Roč. 819, č. 2 (2016), L38/1-L38/8 ISSN 2041-8205 Institutional support: RVO:67985815 Keywords : Kuiper belt objects * occultations * planets and satellites Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.522, year: 2016

Multi-wavelength Analysis of a Solar Network Region

Czech Academy of Sciences Publication Activity Database

Tsiropoula, G.; Tziotziou, K.; Schwartz, Pavol; Heinzel, Petr

2008-01-01

Roč. 32, č. 1 (2008), s. 109-116 ISSN 1845-8319 Grant - others:EU(XE) ESA-PECS project No. 98030 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun * network * oscillations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Impact of galactic and intergalactic dust on the stellar EBL

Czech Academy of Sciences Publication Activity Database

Vavryčuk, Václav

2016-01-01

Roč. 361, č. 6 (2016), 198/1-198/8 ISSN 0004-640X Institutional support: RVO:67985530 Keywords : cosmic background radiation * interstellar dust * light extinction * universe opacity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.622, year: 2016

Cloud model with variable source function for solar H alpha structure

Czech Academy of Sciences Publication Activity Database

Heinzel, Petr; Mein, N.; Mein, P.

1999-01-01

Roč. 346, č. 1 (1999), s. 322-328 ISSN 0004-6361 R&D Projects: GA ČR GA205/96/1199 Institutional research plan: CEZ:K1003601 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.252, year: 1999

Gradient pattern analysis of short solar radio bursts

Czech Academy of Sciences Publication Activity Database

Rosa, R. R.; Karlický, Marian; Veronese, T.B.; Vijaykumar, N. L.; Sawant, H. S.; Borgazzi, A. I.; Dantas, M. S.; Barbosa, E. M. B.; Sych, R.A.; Mendes, O.

2008-01-01

Roč. 42, č. 5 (2008), s. 844-851 ISSN 0273-1177 Institutional research plan: CEZ:AV0Z10030501 Keywords : solar radio bursts * stochastic processes * wavelets Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.860, year: 2008

Geochemistry and chronology of the Bunburra Rockhole ungrouped achondrite

Czech Academy of Sciences Publication Activity Database

Spivak-Birndorf, L.J.; Bouvier, A.; Benedix, G.K.; Hammond, S.; Brennecka, G.A.; Howard, K.; Rogers, N.; Wadhwa, M.; Bland, P.A.; Spurný, Pavel; Towner, M.C.

2015-01-01

Roč. 50, č. 5 (2015), s. 958-975 ISSN 1086-9379 Institutional support: RVO:67985815 Keywords : early solar-system * MN-53-CR-53 systematics * basaltic achondrite Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.819, year: 2015

Mercury's magnetosphere after MESSENGER's first flyby

Czech Academy of Sciences Publication Activity Database

Slavin, J.A.; Acuna, M. H.; Anderson, B.J.; Baker, D. N.; Benna, M.; Gloeckler, G.; Gold, R.E.; Ho, G.C.; Killen, R.M.; Korth, H.; Krimigis, S.M.; McNutt, Jr., R.L.; Nittler, L.R.; Raines, J.M.; Schriver, D.; Solomon, S.C.; Starr, R.D.; Trávníček, Pavel M.; Zurbuchen, T.H.

2008-01-01

Roč. 321, č. 5885 (2008), s. 85-89 ISSN 0036-8075 Institutional research plan: CEZ:AV0Z10030501 Keywords : solar wind * geotail observations * ULF waves Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 28.103, year: 2008

The plasma sheet and boundary layers under northward IMF: A multi-point and multi-instrument perspective

Czech Academy of Sciences Publication Activity Database

Taylor, M. G. G. T.; Lavraud, B.; Escoubet, C. P.; Milan, S.E.; Nykyri, K.; Dunlop, M. W.; Davies, J.A.; Friedel, R.H.W.; Frey, H.; Bogdanova, Y.V.; Asnes, A.; Laakso, H.; Trávníček, Pavel M.; Masson, A.; Opgenoorth, H.; Vallat, C.; Fazakerley, A. N.; Lahiff, A.; Owen, C. J.; Pitout, F.; Pu, Y.; Shen, C.; Zong, Q.-G.; Rème, H.; Scudder, J. D.; Zhang, T. L.

2008-01-01

Roč. 41, č. 10 (2008), s. 1619-1629 ISSN 0273-1177 Institutional research plan: CEZ:AV0Z10030501 Keywords : plasma sheet * magnetopshere * cold dense plasma sheet Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.860, year: 2008

An above-barrier narrow resonance in F-15

Czech Academy of Sciences Publication Activity Database

Grancey, F.; Mercenne, A.; de Oliveira Santos, F.; Davinson, T.; Sorlin, O.; Angelique, J. C.; Assie, M.; Berthoumieux, E.; Borcea, R.; Buta, A.; Celikovic, I.; Chudoba, V.; Daugas, J. M.; Dumitru, G.; Fadil, M.; Grévy, S.; Kiener, J.; Lefebvre-Schuhl, A.; Michel, N.; Mrázek, Jaromír; Negoita, F.; Okolowicz, J.; Pantelica, D.; Pellegriti, M. G.; Perrot, L.; Ploszajczak, M.; Randisi, G.; Ray, I.; Roig, O.; Rotaru, F.; Saint Laurent, M. G.; Smimova, N.; Stanoiu, M.; Stefan, I.; Stodel, C.; Subotic, K.; Tatischeff, V.; Thomas, J. C.; Ujic, P.; Wolski, R.

2016-01-01

Roč. 758, JUL (2016), s. 26-31 ISSN 0370-2693 Institutional support: RVO:61389005 Keywords : resonances * elastic proton scattering * lifetimes width * F-15 * unbound states * overbarrier resonance Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.807, year: 2016

Galactic Center Minispiral: Interaction Modes of Neutron Stars

Czech Academy of Sciences Publication Activity Database

Zajaček, Michal; Karas, Vladimír; Kunneriath, Devaky

2015-01-01

Roč. 55, č. 3 (2015), s. 203-214 ISSN 1210-2709 R&D Projects: GA ČR GB14-37086G Institutional support: RVO:67985815 Keywords : galaxy center * individual objects * Sagittarius A Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The INTEGRAL science data centre

Czech Academy of Sciences Publication Activity Database

Courvoisier, T. J.-L.; Walter, R.; Beckmann, V.; Dean, A. J.; Dubath, P.; Hudec, René; Kretschmar, P.; Mereghetti, S.; Montnerle, T.; Mowlavi, N.; Paltani, S.; Preite Martinez, A.; Produit, N.; Staubert, R.; Strong, A. W.; Swings, J.-P.; Westergaard, N. J.; White, N.; Winkler, C.; Zdiarski, A. A.

2003-01-01

Roč. 411, č. 1 (2003), L53-L57 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z1003909 Keywords : data analysis * gamma ray observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.843, year: 2003

GREGOR solar telescope: Design and status

Czech Academy of Sciences Publication Activity Database

Volkmer, R.; von der Lühe, O.; Denker, C.; Solanki, S.K.; Balthasar, H.; Berkefeld, T.; Caligari, P.; Collados Vera, M.; Fischer, A.; Halbgewachs, C.; Heidecke, F.; Hofmann, A.; Klvaňa, Miroslav; Kneer, F.; Lagg, A.; Popow, E.; Schmidt, D.; Schmidt, W.; Sobotka, Michal; Soltau, D.; Strassmeier, K.G.

2010-01-01

Roč. 331, č. 6 (2010), s. 624-627 ISSN 0004-6337 Institutional research plan: CEZ:AV0Z10030501 Keywords : instrumentation * adaptive optics * high angular resolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.842, year: 2010

The properties of outbursts and long-term activity of the soft X-ray transient 4U 1608-52 (Qx Nor)

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2004-01-01

Roč. 418, č. 2 (2004), s. 617-624 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z1003909 Keywords : neutron stars * X-rays * close binaries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.694, year: 2004

Tumbling asteroids

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Harris, A. W.; Scheirich, Peter; Kušnirák, Peter; Kotková, Lenka; Hergenrother, C.; Mottola, S.; Hicks, M. D.; Masi, G.; Krugly, Yu. N.; Shevchenko, V. G.; Nolan, M. C.; Howell, E. S.; Kaasalainen, M.; Galád, Adrián; Brown, P.; DeGraff, D. R.; Lambert, J.V.; Cooney, W.R.; Foglia, S.

2005-01-01

Roč. 1, č. 173 (2005), s. 108-131 ISSN 0019-1035 R&D Projects: GA AV ČR IAA3003204 Keywords : near-Earth objects * fast-rotating asteroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.244, year: 2005

Multicolour photometry and spectroscopy of the slow nova V475 Sct (Nova Scuti 2003)

Czech Academy of Sciences Publication Activity Database

Chochol, D.; Katysheva, N.A.; Pribulla, T.; Schmidtobreick, L.; Shugarov, S.Yu.; Škoda, Petr; Šlechta, Miroslav; Vittone, A.A.; Volkov, I. M.

2006-01-01

Roč. 6, č. 1 (2006), s. 137-142 ISSN 1009-9271 Institutional research plan: CEZ:AV0Z10030501 Keywords : cataclysmic variables * circumstellar matter * stars: novae Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.746, year: 2006

Photometric and spectroscopic variability of the slow nova V475 Sct (Nova Scuti 2003)

Czech Academy of Sciences Publication Activity Database

Chochol, D.; Katysheva, N.A.; Pribulla, T.; Schmidtobreick, L.; Shugarov, S.Yu.; Škoda, Petr; Šlechta, Miroslav; Vittone, A.A.; Volkov, I. M.

2005-01-01

Roč. 35, č. 2 (2005), s. 107-129 ISSN 1335-1842 R&D Projects: GA AV ČR KSK2043105 Institutional research plan: CEZ:AV0Z1003909 Keywords : novae * photometry * spectroscopy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Antigravity - its manifestations and origin

Czech Academy of Sciences Publication Activity Database

Křížek, Michal; Somer, L.

2013-01-01

Roč. 3, č. 3 (2013), s. 227-235 ISSN 2161-4717 Institutional support: RVO:67985840 Keywords : Hubble parameter * dark energy * antigravity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics http://www.scirp.org/journal/PaperInformation.aspx?paperID=36509

Two-Fluid 2.5D MHD-Code for Simulations in the Solar Atmosphere

Czech Academy of Sciences Publication Activity Database

Piantschitsch, I.; Amerstorfer, U.; Thalmann, J.; Utz, D.; Hanslmeier, A.; Bárta, Miroslav; Thonhofer, S.; Lemmerer, B.

2014-01-01

Roč. 38, č. 1 (2014), s. 59-66 ISSN 1845-8319 R&D Projects: GA MŠk(CZ) 7AMB14AT022 Institutional support: RVO:67985815 Keywords : MHD simulation * chromosphere * reconnection Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

On the Probable Existence of an Abrupt Magnetization in the Upper Chromosphere of the Quiet Sun

Czech Academy of Sciences Publication Activity Database

Štěpán, Jiří; Trujillo Bueno, J.

2010-01-01

Roč. 711, č. 2 (2010), L133-L137 ISSN 2041-8205 Institutional research plan: CEZ:AV0Z10030501 Keywords : magnetic fields * polarization * radiative transfer Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.020, year: 2010

Measurements of chromospheric velocity fields by means of the Coimbra University spectroheliograph

Czech Academy of Sciences Publication Activity Database

Garcia, A.; Klvaňa, Miroslav; Sobotka, Michal

2010-01-01

Roč. 34, č. 1 (2010), s. 47-56 ISSN 1845-8319 R&D Projects: GA AV ČR IAA300030808 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun * chromosphere * instrumentation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

SphinX : A fast solar Ph otometer in X -rays

Czech Academy of Sciences Publication Activity Database

Sylwester, J.; Kuzin, S.; Kotov, Yu. D.; Fárník, František; Reale, F.

2008-01-01

Roč. 29, 1-2 (2008), s. 339-343 ISSN 0250-6335 Institutional research plan: CEZ:AV0Z10030501 Keywords : X-rays * spectrophotometer * high time resolution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.667, year: 2008

Classification of Spectra of Emission Line Stars Using Machine Learning Techniques

Czech Academy of Sciences Publication Activity Database

Bromová, P.; Škoda, Petr; Vážný, Jaroslav

2014-01-01

Roč. 11, č. 3 (2014), s. 265-273 ISSN 1476-8186 R&D Projects: GA ČR GA13-08195S Institutional support: RVO:67985815 Keywords : Be star * stellar spectrum * feature extraction Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Shock experiments in range of 10–45 GPa with small multidomain magnetite in porous targets

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Pesonen, L. J.; Deutsch, A.; Wünnemann, K.; Nowka, D.; Hornemann, U.; Heikinheimo, E.

2012-01-01

Roč. 47, č. 10 (2012), s. 1671-1680 ISSN 1086-9379 Institutional research plan: CEZ:AV0Z30130516 Keywords : shock * magnetite * magnetism * magnetic properties * density porosity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.800, year: 2012

FFT-based high-performance spherical harmonic transformation

Czech Academy of Sciences Publication Activity Database

Gruber, Ch.; Novák, P.; Sebera, Josef

2011-01-01

Roč. 55, č. 3 (2011), s. 489-500 ISSN 0039-3169 Institutional research plan: CEZ:AV0Z10030501 Keywords : 2-D Fourier expansion * geopotential * spherical harmonics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.700, year: 2011

Lines of MgI Detected in Solar Prominences

Czech Academy of Sciences Publication Activity Database

Heinzel, Petr; Kupryakov, Yu. A.; Schwartz, P.

2016-01-01

Roč. 40, č. 1 (2016), s. 87-91 ISSN 1845-8319. [Hvar Astrophysical Colloquium /14./. Hvar, 26.09.2016-30.09.2016] Institutional support: RVO:67985815 Keywords : prominences * limb-flare * MgI emession Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Detection of the N2+ first negative system in a bright Leonid fireball

Czech Academy of Sciences Publication Activity Database

Abe, S.; Ebizuka, N.; Yano, H.; Watanabe, J.; Borovička, Jiří

2005-01-01

Roč. 618, č. 2 (2005), L141-L144 ISSN 0004-637X Institutional research plan: CEZ:AV0Z1003909 Keywords : meteors * molecular process * astrobiology Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.308, year: 2005

Occultation/Eclipse Events in Binary Asteroid 1991 VH

Czech Academy of Sciences Publication Activity Database

Pravec, Petr; Wolf, M.; Kotková, Lenka

1998-01-01

Roč. 133, č. 1 (1998), s. 79-88 ISSN 0019-1035 R&D Projects: GA AV ČR IAA3003708; GA ČR GA205/95/1498 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.215, year: 1998

Properties of Hermean plasma belt: Numerical simulations and comparison with MESSENGER data

Czech Academy of Sciences Publication Activity Database

Herčík, David; Trávníček, Pavel M.; Štverák, Štěpán; Hellinger, Petr

2016-01-01

Roč. 121, č. 1 (2016), s. 413-431 ISSN 2169-9380 Grant - others:European Commission(XE) 284515 Institutional support: RVO:67985815 ; RVO:68378289 Keywords : Mercury * plasma belt * numerical simulations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.733, year: 2016

X-ray analysis of fully depleted CCDs with small pixel size

Czech Academy of Sciences Publication Activity Database

Kotov, I.V.; Haupt, J.; Kubánek, Petr; O'Connor, P.; Takacs, P.

2015-01-01

Roč. 787, Jul (2015), s. 12-19 ISSN 0168-9002 Institutional support: RVO:68378271 Keywords : charge diffusion * Charge transfer efficiency * CTE * CCD Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 1.200, year: 2015

14 July 2000, a near-global coronal event and its association with energetic electron events detected in the interplanetary medium

Czech Academy of Sciences Publication Activity Database

Maia, D.; Pick, M.; Hawkins, S. E.; Fomichev, V. V.; Jiřička, Karel

2001-01-01

Roč. 204, 1/2 (2001), s. 199-214 ISSN 0038-0938 Institutional research plan: CEZ:AV0Z1003909 Keywords : coronal mass ejections * solar radio emissions * interplanetary particles Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.103, year: 2001

Reconstruction of a helical prominence in 3D from IRIS spectra and images

Czech Academy of Sciences Publication Activity Database

Schmieder, B.; Zapiór, Maciej; Ariste, A.L.; Levens, P.; Labrosse, N.; Gravet, R.

2017-01-01

Roč. 606, October (2017), A30/1-A30/13 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : Sun * filaments * prominences Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

Dynamical modeling validation of parent bodies associated with newly discovered CMN meteor showers

Czech Academy of Sciences Publication Activity Database

Šegon, D.; Vaubaillon, J.; Gural, P.S.; Vida, D.; Andreić, Z.; Korlević, K.; Skokić, Ivica

2017-01-01

Roč. 598, February (2017), A15/1-A15/13 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : meteorites * meteors * meteoroids Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

Beyond the standard model of the disc-line spectral profiles from black hole accretion discs

Czech Academy of Sciences Publication Activity Database

Sochora, Vjačeslav; Karas, Vladimír; Svoboda, Jiří; Dovčiak, Michal

2014-01-01

Roč. 54, č. 4 (2014), s. 301-304 ISSN 1210-2709 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion discs * black hole physics * galactic nuclei Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Modelling the X-ray polarimetric signatures of complex geometry: the case study of the 'changing look' active galactic nucleus NGC 1365

Czech Academy of Sciences Publication Activity Database

Marin, F.; Porquet, D.; Goosmann, R. W.; Dovčiak, Michal; Muleri, F.; Grosso, B.; Karas, Vladimír

2013-01-01

Roč. 436, č. 2 (2013), s. 1615-1620 ISSN 0035-8711 R&D Projects: GA MŠk LD12010 Institutional support: RVO:67985815 Keywords : line profiles * polarization * radiative transfer Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.226, year: 2013

The broad band spectral properties of SgrA* . The fate of the dusty object approaching the center

Czech Academy of Sciences Publication Activity Database

Eckart, A.; Muzic, K.; Yazici, S.; Sabha, N.; Shahzamanian, B.; Witzel, G.; Moser, L.; García-Marín, M.; Valencia-S, M.; Jalali, B.; Bremer, M.; Straubmeier, C.; Rauch, C.; Buchholz, R. M.; Kunneriath, Devaky; Moultaka, J.

2013-01-01

Roč. 84, č. 3 (2013), s. 618-621 ISSN 0037-8720. [X-ray astronomy: towards the next 50 years!. Milano, 01.10.2012-05.10.2012] Institutional support: RVO:67985815 Keywords : galaxy center * infrared stars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Active region fine structure observed at 0.08 arcsec resolution

Czech Academy of Sciences Publication Activity Database

Schlichenmaier, R.; von der Lühe, O.; Hoch, S.; Soltau, D.; Berkefeld, T.; Schmidt, D.; Schmidt, W.; Denker, C.; Balthasar, H.; Hofmann, A.; Strassmeier, K.G.; Staude, J.; Feller, A.; Lagg, A.; Solanki, S.K.; Collados Vera, M.; Sigwarth, M.; Volkmer, R.; Waldmann, T.A.; Kneer, F.; Nicklas, H.; Sobotka, Michal

2016-01-01

Roč. 596, December (2016), A7/1-A7/8 ISSN 0004-6361 EU Projects: European Commission(XE) 312495 - SOLARNET Institutional support: RVO:67985815 Keywords : Sun * activity * sunspots Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

CONCORD: comparison of cosmic radiation detectors in the radiation field at aviation altitudes

Czech Academy of Sciences Publication Activity Database

Meier, M.; Trompier, F.; Ambrožová, Iva; Kubančák, Ján; Matthia, D.; Ploc, Ondřej; Santen, N.; Wirtz, M.

2016-01-01

Roč. 6, MAY (2016), A24 ISSN 2115-7251 Institutional support: RVO:61389005 Keywords : aviation * radiation exposure of aircrew * comparison of radiation detectors * galactic cosmic radiation * ambient dose equivalent Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.446, year: 2016

Shock-darkening in ordinary chondrites: Determination of the pressure-temperature conditions by shock physics mesoscale modeling

Czech Academy of Sciences Publication Activity Database

Moreau, J.; Kohout, Tomáš; Wünnemann, K.

2017-01-01

Roč. 52, č. 11 (2017), s. 2375-2390 ISSN 1086-9379 Institutional support: RVO:67985831 Keywords : chondrites * pressure-temperature conditions * astrophysics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 2.391, year: 2016

A conventional value for the geoid reference potential

Czech Academy of Sciences Publication Activity Database

Sánchez, L.; Čundrlík, R.; Dayoub, N.; Mikula, K.; Minarechová, Z.; Šíma, Zdislav; Vatrt, V.; Vojtíšková, M.

2016-01-01

Roč. 90, č. 9 (2016), s. 815-835 ISSN 0949-7714 Institutional support: RVO:67985815 Keywords : gobal W-0 value * W-0 best estimate * potential value of the geoid Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.949, year: 2016

The space environment of Mercury at the times of the second and third MESSENGER flybys

Czech Academy of Sciences Publication Activity Database

Baker, D. N.; Odstrčil, D.; Anderson, B.J.; Arge, C. N.; Benna, M.; Gloeckler, G.; Korth, H.; Mayer, L. R.; Raines, J.M.; Schriver, D.; Slavin, J.A.; Solomon, S.C.; Trávníček, Pavel M.; Zurbuchen, T.H.

2011-01-01

Roč. 59, č. 15 (2011), s. 2066-2074 ISSN 0032-0633 Institutional support: RVO:67985815 Keywords : Mercury * solar wind * interplanetary magnetic field Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 2.224, year: 2011

FRELLED: A realtime volumetric data viewer for astronomers

Czech Academy of Sciences Publication Activity Database

Taylor, Rhys

2015-01-01

Roč. 13, November (2015), s. 67-79 ISSN 2213-1337 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : radio lines * galaxies * surveys Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.920, year: 2015

SEREN - a new SPH code for star and planet formation simulations Algorithms and tests

Czech Academy of Sciences Publication Activity Database

Hubber, D.A.; Batty, C.P.; McLeod, Andrew; Whitworth, A.

2011-01-01

Roč. 529, May (2011), A27/1-A27/28 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : hydrodynamics * numerical methods * star s formation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.587, year: 2011

Hydrodynamic and Radiative Modeling of Temporal Hα Emission V/R Variations Caused by Discontinuous Mass Transfer in Binaries

Czech Academy of Sciences Publication Activity Database

Chadima, P.; Fiřt, R.; Harmanec, P.; Wolf, M.; Ruždjak, D.; Božić, H.; Koubský, Pavel

2011-01-01

Roč. 142, č. 1 (2011), 7/1-7/4 ISSN 0004-6256 Institutional research plan: CEZ:AV0Z10030501 Keywords : close binaries stars * circumstellar matter * emission-line Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.035, year: 2011

Mirror Instability in the Turbulent Solar Wind

Czech Academy of Sciences Publication Activity Database

Hellinger, Petr; Landi, S.; Matteini, L.; Verdini, A.; Franci, L.

2017-01-01

Roč. 838, č. 2 (2017), 158/1-158/7 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : instabilities * solar wind * waves Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.533, year: 2016

Once in a blue moon: detection of “bluing” during debris transits in the white dwarf WD 1145+017

Czech Academy of Sciences Publication Activity Database

Hallakoun, N.; Xu, S.; Maoz, D.; Marsh, T. R.; Ivanov, V.D.; Dhillon, V. S.; Boursot, P.; Parsons, S. G.; Kerry, P.; Sharma, S.; Su, K.; Rengaswamy, S.; Pravec, Petr; Kušnirák, Peter; Kučáková, H.; Armstrong, J. D.; Arnold, C.; Gerard, N.; Vanzi, L.

2017-01-01

Roč. 469, č. 3 (2017), s. 3213-3224 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : planetary-atmospheres * scattering * white dwarfs Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 4.961, year: 2016

A Spectroscopic and Photometric Survey of Novae in M31

Czech Academy of Sciences Publication Activity Database

Shafter, A.W.; Darnley, M.J.; Hornoch, Kamil; Filippenko, A.V.; Bode, M.F.; Ciardullo, R.; Misselt, K.A.; Hounsell, R.A.; Chornock, R.; Matheson, T.

2011-01-01

Roč. 734, č. 1 (2011), 12/1-12/28 ISSN 0004-637X Institutional research plan: CEZ:AV0Z10030501 Keywords : individual galaxy (M31) * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.024, year: 2011

Time-resolved UVES observations of a stellar flare on the planet host HD 189733 during primary transit

Czech Academy of Sciences Publication Activity Database

Klocová, Tereza; Czesla, S.; Khalafinejad, S.; Wolter, U.; Schmitt, J.H.M.M.

2017-01-01

Roč. 607, November (2017), A66/1-A66/12 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : stars * chromospheres * flare Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

The O-type eclipsing binary SZ Camelopardalis revisited

Czech Academy of Sciences Publication Activity Database

Mayer, P.; Drechsel, H.; Kubát, Jiří; Šlechta, Miroslav

2010-01-01

Roč. 524, Dec (2010), A1/1-A1/5 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : eclipsing binaries * early-type stars * fundamental parameters Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.410, year: 2010

Large distance of epsilon Aurigae inferred from interstellar absorption and reddening

Czech Academy of Sciences Publication Activity Database

Guinan, E. F.; Mayer, P.; Harmanec, P.; Božić, H.; Brož, M.; Nemravová, J.; Engle, S.; Šlechta, Miroslav; Zasche, P.; Wolf, M.; Korčáková, D.; Johnston, C.

2012-01-01

Roč. 546, October (2012), A123/1-A123/15 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : AGB and post-AGB stars * distances * eclipsing Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

Photoacoustic Sounds from Meteors

Czech Academy of Sciences Publication Activity Database

Spalding, R.; Tencer, J.; Sweatt, W.; Conley, B.; Hogan, R.; Boslough, M.B.; Gonzales, G.; Spurný, Pavel

2017-01-01

Roč. 7, February (2017), 41251/1-41251/6 ISSN 2045-2322 Institutional support: RVO:67985815 Keywords : photoacoustic coupling * experimental results * numerical models Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 4.259, year: 2016

Evolutionary changes in the eclipsing binary .beta. Lyrae

Czech Academy of Sciences Publication Activity Database

Harmanec, Petr

1999-01-01

Roč. 43, 6-7 (1999), s. 491-497 ISSN 1387-6473. [ General Assembly of the International Astronomical Union /23./. Kyoto, 18.08.1997-30.08.1997] Institutional research plan: CEZ:AV0Z1003909 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Kundt spacetimes minimally coupled to scalar field

Czech Academy of Sciences Publication Activity Database

Tahamtan, Tayebeh; Svítek, O.

2017-01-01

Roč. 77, č. 6 (2017), 384/1-384/11 ISSN 1434-6044 Institutional support: RVO:67985815 Keywords : gravitational waves * general relativity * classification Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.331, year: 2016

Photonic analogies of gravitational attractors

KAUST Repository

San-Romá n-Alerigi, Damiá n P.; Alsunaidi, Mohammad A.; Ng, Tien Khee; Ooi, Boon S.; Ben Slimane, Ahmed; Zhang, Yaping

2013-01-01

In our work we demonstrate a Gaussian-like refractive index mapping to realize light trapping. Our study shows that this centro-symmetrical photonic structure is able to mime the light geodesics described by celestial mechanics. Possible applications are discussed. © 2013 IEEE.

Outbursts of binary X-ray sources suitable for monitoring of their optical emission by the amateur observers

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

-, č. 125 (2010), s. 21-23 ISSN 1801-5964. [Conference on Variable Stars Research /41./. Prague, 27.11.2009-29.11.2009] Institutional research plan: CEZ:AV0Z10030501 Keywords : visual observing * CCD observing Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors

Czech Academy of Sciences Publication Activity Database

Brown, P. G.; Assink, J.D.; Astiz, L.; Blaauw, R.; Boslough, M.B.; Borovička, Jiří; Brachet, N.; Brown, D.; Campbell-Brown, M.; Ceranna, L.; Cooke, W.; de Groot-Hedlin, C.; Drob, D.P.; Edwards, W.; Evers, L.G.; Garces, M.; Gill, J.; Hedlin, M.; Kingery, A.; Laske, G.; Le Pichon, A.; Mialle, P.; Moser, D.E.; Saffer, A.; Silber, E.; Smets, P.; Spalding, R. E.; Spurný, Pavel; Tagliaferri, E.; Uren, D.; Weryk, R.J.; Whitaker, R.; Krzeminski, Z.

2013-01-01

Roč. 503, č. 7475 (2013), s. 238-241 ISSN 0028-0836 Grant - others: NASA (US) NNX11AB76A Institutional support: RVO:67985815 Keywords : superbolide * meteorite fall * airburst Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 42.351, year: 2013

The ISL Langmuir probe experiment processing onboard DEMETER: Scientific objectives, description and first results

Czech Academy of Sciences Publication Activity Database

Lebreton, J. P.; Štverák, Štěpán; Trávníček, Pavel M.; Maksimovic, M.; Klinge, A.; Merikallio, S.; Lagoutte, D.; Poirier, B.; Blelly, P. L.; Kozáček, Z.; Salaquarda, M.

2006-01-01

Roč. 54, č. 5 (2006), s. 472-486 ISSN 0032-0633 Institutional research plan: CEZ:AV0Z30420517 Keywords : electrostatic probes * ionospheric plasma * electron density and temperature Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.509, year: 2006

The Arecibo Galaxy Environment Survey - VIII. Discovery of an isolated dwarf galaxy in the Local Volume

Czech Academy of Sciences Publication Activity Database

Taylor, Rhys; Minchin, R.F.; Herbst, H.; Smith, R.

2014-01-01

Roč. 442, č. 1 (2014), L46-L50 ISSN 0035-8711 Institutional support: RVO:67985815 Keywords : surveys * galaxies * distances and redshifts Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.107, year: 2014

Solar arch filaments observed with THEMIS

Czech Academy of Sciences Publication Activity Database

Mein, P.; Briand, C.; Heinzel, Petr; Mein, N.

2000-01-01

Roč. 355, č. 3 (2000), s. 1146-1151 ISSN 0004-6361 R&D Projects: GA AV ČR KSK1003601 Institutional research plan: CEZ:AV0Z1003909 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.790, year: 2000

RAT magnet experiment on the Mars Exploration Rovers: Spirit and Opportunity beyond sol 500

Czech Academy of Sciences Publication Activity Database

Leer, K.; Goetz, W.; Chan, M. A.; Gorevan, S.; Hansen, M. F.; Jensen, Ch. L.; Kletetschka, Günther; Kusack, A.; Madsen, M. B.

2011-01-01

Roč. 116, č. 4 (2011), E00F18-E00F18 ISSN 0148-0227 Institutional research plan: CEZ:AV0Z30130516 Keywords : magnetic mineralogy * hematite * Mars Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.021, year: 2011

Spectroscopic Observations of the 2011 Draconids Meteor Shower

Czech Academy of Sciences Publication Activity Database

Rudawska, R.; Zender, J.; Jenniskens, P.; Vaubaillon, J.; Koten, Pavel; Margonis, A.; Toth, J.; McAuliffe, J.; Koschny, D.

2014-01-01

Roč. 112, 1-4 (2014), s. 45-57 ISSN 0167-9295 R&D Projects: GA ČR GA205/09/1302 Institutional support: RVO:67985815 Keywords : meteorites * meteors * meteoroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.667, year: 2014

Video Observation of the Leonids 2001 Activity

Czech Academy of Sciences Publication Activity Database

Lin, C.L.; Abe, S.; Koten, Pavel; Yang, I.-Ch.

2012-01-01

Roč. 64, č. 1 (2012), 6/1-6/6 ISSN 0004-6264 Institutional research plan: CEZ:AV0Z10030501 Keywords : comet 55P/Tempel-Tuttle * interplanetary medium * meteors Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.439, year: 2012

Electron-stimulated desorption of silicates: A potential source for ions in Mercury's space environment

Czech Academy of Sciences Publication Activity Database

McLain, J.L.; Sprague, A.L.; Grieves, G.A.; Schriver, D.; Trávníček, Pavel M.; Orlando, T.M.

2011-01-01

Roč. 116, - (2011), E03007/1-E03007/9 ISSN 0148-0227 Institutional research plan: CEZ:AV0Z10030501 Keywords : auger decay * Mercury * Mercury's exosphere * magnetospheric interactions Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.021, year: 2011

Spinning up black holes with super-critical accretion flows

Czech Academy of Sciences Publication Activity Database

Sądowski, A.; Bursa, Michal; Abramowicz, M. A.; Kluzniak, W.; Lasota, J.-P.; Moderski, R.; Safarzadeh, M.

2011-01-01

Roč. 532, August (2011), A41/1-A41/11 ISSN 0004-6361 Institutional research plan: CEZ:AV0Z10030501 Keywords : black hole physics * accretion * accretion disks Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.587, year: 2011

Fulltext PDF

Indian Academy of Sciences (India)

celestial radio sources for about 10 hours a day by a mechanical rotation of ... students spend about six weeks at NCRA to work on specific research ... Camp held in Homi Bhabha Centre for Science Education, Mumbai from May 7 to June 4,.

The Cyclic variation of the outburst recurrence time in GRS 1747-312

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch

2009-01-01

Roč. 14, č. 5 (2009), s. 443-450 ISSN 1384-1076 Institutional research plan: CEZ:AV0Z10030501 Keywords : X-ray transients * neutron stars * X-rays binaries Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.675, year: 2009

A global vertical reference frame based on four regional vertical datums

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Kenyon, S.; Kouba, J.; Šíma, Zdislav; Vatrt, V.; Vojtíšková, M.

2004-01-01

Roč. 48, č. 3 (2004), s. 493-502 ISSN 0039-3169 Institutional research plan: CEZ:AV0Z1003909 Keywords : geopotentinal * local vertical datums * global vertical reference frame Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.447, year: 2004

Temporal variations in the second-degree stokes tesseral geopotential coefficients from TOPEX/Poseidon altimetry

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Kenyon, S.; Kouba, J.; Šíma, Zdislav; Vatrt, V.; Vítek, V.; Vojtíšková, M.

2003-01-01

Roč. 93, č. 1 (2003), s. 37-64 ISSN 0167-9295 Institutional research plan: CEZ:AV0Z1003909 Keywords : T/P altimery * stokes 2-nd degree tesseral coeficients Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.418, year: 2003

Global Vertical Reference Frame

Czech Academy of Sciences Publication Activity Database

Burša, Milan; Kenyon, S.; Kouba, J.; Šíma, Zdislav; Vatrt, V.; Vojtíšková, M.

-, č. 5 (2009), s. 53-63 ISSN 1801-8483 R&D Projects: GA ČR GA205/08/0328 Institutional research plan: CEZ:AV0Z10030501 Keywords : sea surface topography * satellite altimetry * vertical frames Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The Twin Peak QPOs in Neutron Star and Black Hole Sources: What is explained, and What is not

Czech Academy of Sciences Publication Activity Database

Abramowicz, M. A.; Kluzniak, W.; Bursa, Michal; Horák, Jiří; Rebusco, P.; Török, G.

2007-01-01

Roč. 27, Marzo 2007 (2007), s. 8-17 ISSN 1405-2059 R&D Projects: GA AV ČR IAA300030510 Institutional research plan: CEZ:AV0Z10030501 Keywords : accretion * accretion disks * black hole physics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The spectroscopic evolution of the symbiotic-like recurrent nova V407 Cygni during its 2010 outburst II. The circumstellar environment and the aftermath

Czech Academy of Sciences Publication Activity Database

Shore, S. N.; Wahlgren, G.M.; Augusteijn, T.; Liimets, T.; Koubský, Pavel; Šlechta, Miroslav; Votruba, Viktor

2012-01-01

Roč. 540, April (2012), A55/1-A55/15 ISSN 0004-6361 Institutional support: RVO:67985815 Keywords : gamma-ray burst * cataclysmic variables stars * star V407 Cygni Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.084, year: 2012

Radio Evidence of Break-out Reconnection?

Czech Academy of Sciences Publication Activity Database

Aurass, H.; Mann, G.; Zlobec, P.; Karlický, Marian

2011-01-01

Roč. 730, č. 1 (2011), 57/1-57/9 ISSN 0004-637X Institutional research plan: CEZ:AV0Z10030501 Keywords : solarcorona * coronal mass ejections * solar flares Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.024, year: 2011

Hard X-rays from neutralized ion beams in solar flares

Czech Academy of Sciences Publication Activity Database

Brown, J. C.; Karlický, Marian; Mandzhavidze, N.; Ramaty, R.

2000-01-01

Roč. 541, č. 2 (2000), s. 1104-1108 ISSN 0004-637X R&D Projects: GA AV ČR IAA3003707 Institutional research plan: CEZ:AV0Z1003909 Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.822, year: 2000

Density, porosity, mineralogy, and internal structure of cosmic dust and alteration of its properties during high-velocity atmospheric entry

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Kallonen, A.; Suuronen, J.-P.; Rochette, P.; Hutzler, A.; Gattacceca, J.; Badjukov, D. D.; Skála, Roman; Böhmová, Vlasta; Čuda, J.

2014-01-01

Roč. 49, č. 7 (2014), s. 1157-1170 ISSN 1086-9379 R&D Projects: GA MŠk LH12079 Institutional support: RVO:67985831 Keywords : micrometeorite * tomography * density * porosity * meteoroid Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.104, year: 2014

Fluctuation analysis of solar radio bursts associated with geoeffective X-class flares

Czech Academy of Sciences Publication Activity Database

Veronese, T.B.; Rosa, R. R.; Bolzan, M.J.A.; Fernandes, F. C. R.; Sawant, H. S.; Karlický, Marian

2011-01-01

Roč. 73, 11-12 (2011), s. 1311-1316 ISSN 1364-6826 Institutional research plan: CEZ:AV0Z10030501 Keywords : decimetric solar radio bursts * solar flares * detrended fluctuation analysis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.596, year: 2011

GRIPS - Gamma-Ray Imaging, Polarimetry and Spectroscopy

Czech Academy of Sciences Publication Activity Database

Greiner, J.; Mannheim, K.; Hudec, René; Mészáros, A.

2012-01-01

Roč. 34, č. 2 (2012), s. 551-582 ISSN 0922-6435 Institutional research plan: CEZ:AV0Z10030501 Keywords : compton and pair creation telescope * gamma-ray bursts * nucleosynthesis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.969, year: 2012

Potassium detection in the clear atmosphere of a hot-Jupiter FORS2 transmission spectroscopy of WASP-17b

Czech Academy of Sciences Publication Activity Database

Sedaghati, E.; Boffin, H.M.J.; Jeřábková, T.; Munoz, A.G.; Grenfell, J.L.; Smette, A.; Ivanov, V.D.; Csizmadia, S.; Cabrera, J.; Kabáth, Petr; Rocchetto, M.; Rauer, H.

2016-01-01

Roč. 596, December (2016), A47/1-A47/14 ISSN 0004-6361 R&D Projects: GA MŠk LG14013 Institutional support: RVO:67985815 Keywords : planets * satellites * atmospheres Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Annama H chondrite-Mineralogy, physical properties, cosmic ray exposure, and parent body history

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Haloda, J.; Halodová, P.; Meiner, M. M. M.; Maden, C.; Busemann, H.; Laubenstein, M.; Caffee, M. W.; Welten, K.C.; Hopp, J.; Trieloff, M.; Mahajan, R. R.; Naik, S.; Trigo-Rodríguez, J.M.; Moyano-Cambero, C. E.; Oshtrakh, M. I.; Maksimova, A. A.; Chukin, A. V.; Semionkin, V. A.; Karabanalov, M. S.; Felner, I.; Petrova, E. V.; Brusnitsyna, E. V.; Grokhovsky, V. I.; Yakovlev, G. A.; Gritsevich, M.; Lyytinen, E.; Moilanen, J.; Kruglikov, N. A.; Ishchenko, A. V.

2017-01-01

Roč. 52, č. 8 (2017), s. 1525-1541 ISSN 1086-9379 Institutional support: RVO:67985831 Keywords : Annama * chondrite * cosmic-ray exposure * radionuclide Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 2.391, year: 2016

Spheroidal models of the exterior gravitational field of Asteroids Bennu and Castalia

Czech Academy of Sciences Publication Activity Database

Sebera, Josef; Bezděk, Aleš; Pešek, I.; Henych, Tomáš

2016-01-01

Roč. 272, July (2016), s. 70-79 ISSN 0019-1035 R&D Projects: GA MŠk LH13071 Institutional support: RVO:67985815 Keywords : asteroids surfaces * near-Earth objects * geophysics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.131, year: 2016

The first spectroscopically confirmed Mira star in M33

Czech Academy of Sciences Publication Activity Database

Barsukova, E.A.; Goranskij, V.P.; Hornoch, Kamil; Fabrika, S.; Pietsch, W.; Sholukhova, O.; Valeev, A.F.

2011-01-01

Roč. 413, č. 3 (2011), s. 1797-1802 ISSN 0035-8711 Institutional research plan: CEZ:AV0Z10030501 Keywords : AGB and post AGB * variables stars * general galaxies Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.900, year: 2011

Off-axis irradiation and the polarization of broad emission lines in active galactic nuclei

Czech Academy of Sciences Publication Activity Database

Goosmann, R. W.; Gaskell, C.M.; Marin, Frederic

2014-01-01

Roč. 54, č. 7 (2014), s. 1341-1346 ISSN 0273-1177 Institutional support: RVO:67985815 Keywords : polarization * radiative transfer * R line profiles Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 1.358, year: 2014

On Celestial Wings,

Science.gov (United States)

1995-11-01

Much of the labor entailed carrying stores of American food to Japanese ships. The stores included rice, cornmeal , and a large variety of canned...goods. It was possible to poke a hole in a bag and fill our pockets with rice or cornmeal . We could also try to pry a board off a crate, get a can of food

Physical properties, structure and fracturing of the Chelyabinsk LL5 meteorite body

Czech Academy of Sciences Publication Activity Database

Grokhovsky, V. I.; Kohout, Tomáš; Gritsevich, M.; Koneva, E. V.

2014-01-01

Roč. 49, Special issue 1 (2014), pdf 5364-pdf 5364 ISSN 1086-9379. [Annual Meeting of the Meteoritical Society /77./. 08.09.2014-13.09.2014, Casablanca] Institutional support: RVO:67985831 Keywords : Chelyabinsk * LL chondrite * physical properties * structure * mechanical properties * stress Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics http://www.hou.usra.edu/meetings/metsoc2014/pdf/5364.pdf

The ionization equilibrium and flare line spectra for the electron distribution with a power-law tail

Czech Academy of Sciences Publication Activity Database

Dzifčáková, Elena; Homola, M.; Dudík, Jaroslav

2011-01-01

Roč. 531, July (2011), A111/1-A111/5 ISSN 0004-6361 R&D Projects: GA ČR GA205/09/1705 Grant - others:SAV(SK) Vega 1/0240/11 Institutional research plan: CEZ:AV0Z10030501 Keywords : atomic processes * non- thermal radiation mechanisms * solar flares Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.587, year: 2011

Evolution of the color indices in SN 2006aj associated with GRB 060218

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch; Pizzichini, G.; Hudec, René

2010-01-01

Roč. 523, Nov-Dec (2010), A56/1-A56/11 ISSN 0004-6361 R&D Projects: GA ČR GA205/08/1207 Grant - others:ESA(XE) ESA-PECS project No. 98058 Institutional research plan: CEZ:AV0Z10030501 Keywords : gamma-ray burst * radiation mechanisms Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.410, year: 2010

A two-level approach to VLBI terrestrial and celestial reference frames using both least-squares adjustment and Kalman filter algorithms

Science.gov (United States)

Soja, B.; Krasna, H.; Boehm, J.; Gross, R. S.; Abbondanza, C.; Chin, T. M.; Heflin, M. B.; Parker, J. W.; Wu, X.

2017-12-01

The most recent realizations of the ITRS include several innovations, two of which are especially relevant to this study. On the one hand, the IERS ITRS combination center at DGFI-TUM introduced a two-level approach with DTRF2014, consisting of a classical deterministic frame based on normal equations and an optional coordinate time series of non-tidal displacements calculated from geophysical loading models. On the other hand, the JTRF2014 by the combination center at JPL is a time series representation of the ITRF determined by Kalman filtering. Both the JTRF2014 and the second level of the DTRF2014 are thus able to take into account short-term variations in the station coordinates. In this study, based on VLBI data, we combine these two approaches, applying them to the determination of both terrestrial and celestial reference frames. Our product has two levels like DTRF2014, with the second level being a Kalman filter solution like JTRF2014. First, we compute a classical TRF and CRF in a global least-squares adjustment by stacking normal equations from 5446 VLBI sessions between 1979 and 2016 using the Vienna VLBI and Satellite Software VieVS (solution level 1). Next, we obtain coordinate residuals from the global adjustment by applying the level-1 TRF and CRF in the single-session analysis and estimating coordinate offsets. These residuals are fed into a Kalman filter and smoother, taking into account the stochastic properties of the individual stations and radio sources. The resulting coordinate time series (solution level 2) serve as an additional layer representing irregular variations not considered in the first level of our approach. Both levels of our solution are implemented in VieVS in order to test their individual and combined performance regarding the repeatabilities of estimated baseline lengths, EOP, and radio source coordinates.

A new view on the M87 jet origin: Turbulent loading leading to large-scale episodic wiggling

Czech Academy of Sciences Publication Activity Database

Britzen, S.; Fendt, C.; Eckart, A.; Karas, Vladimír

2017-01-01

Roč. 601, May (2017), A52/1-A52/17 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : interferometric techniques * active galaxies * jets Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

The instrumentally recorded fall of the Križevci meteorite, Croatia, February 4, 2011

Czech Academy of Sciences Publication Activity Database

Borovička, Jiří; Spurný, Pavel; Šegon, D.; Andreić, Z.; Kac, J.; Korlević, K.; Atanackov, J.; Kladnik, G.; Mucke, H.; Vida, D.; Novoselnik, F.

2015-01-01

Roč. 50, č. 7 (2015), s. 1244-1259 ISSN 1086-9379 R&D Projects: GA ČR(CZ) GAP209/11/1382 Institutional support: RVO:67985815 Keywords : innisfree meteorite * fragmentation * meteoroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.819, year: 2015

NGC 6334 and NGC 6357 Insights from spectroscopy of their OB star populations

Czech Academy of Sciences Publication Activity Database

Russeil, D.; Adami, C.; Bouret, J.-C.; Hervé, Anthony; Parker, Q.A.; Zavagno, A.; Motte, F.

2017-01-01

Roč. 607, November (2017), A86/1-A86/32 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : stars distances * HII regions * ISM Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

Monitoring the Galactic Centre with the Australia Telescope Compact Array

Czech Academy of Sciences Publication Activity Database

Borkar, A.; Eckart, A.; Straubmeier, C.; Kunneriath, Devaky; Jalali, B.; Sabha, N.; Shahzamanian, B.; García-Marín, M.; Valencia-S, M.; Sjouwerman, L.; Britzen, S.; Karas, Vladimír; Dovčiak, Michal; Donea, A.; Zensus, A.

2016-01-01

Roč. 458, č. 3 (2016), s. 2336-2349 ISSN 0035-8711 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : galactic Centre * black hole Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

General relativistic modelling of the negative reverberation X-ray time delays in AGN(star)

Czech Academy of Sciences Publication Activity Database

Emmanoulopoulos, D.; Papadakis, I.E.; Dovčiak, Michal; McHardy, I.M.

2014-01-01

Roč. 439, č. 4 (2014), s. 3931-3950 ISSN 0035-8711 Grant - others:STFC(GB) ST/G003084/1 Institutional support: RVO:67985815 Keywords : accretion discs * black hole physics * relativistic processes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.107, year: 2014

Ionisation Equilibrium for the Non-Maxwellian Electron -Distributions in Solar Flares: Updated Calculations

Czech Academy of Sciences Publication Activity Database

Dzifčáková, Elena; Dudík, Jaroslav

2015-01-01

Roč. 290, č. 12 (2015), s. 3545-3558 ISSN 0038-0938 R&D Projects: GA ČR GAP209/12/1652 Institutional support: RVO:67985815 Keywords : energetic particles * acceleration * electrons Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.862, year: 2015

Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare

Czech Academy of Sciences Publication Activity Database

Hénoux, J. C.; Karlický, Marian

2013-01-01

Roč. 556, August (2013), A95/1-A95/8 ISSN 0004-6361 R&D Projects: GA ČR GAP209/12/0103 Institutional support: RVO:67985815 Keywords : Sun * polarization * activity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

Three-dimensional structure of a sunspot light bridge

Czech Academy of Sciences Publication Activity Database

Felipe, T.; Collados Vera, M.; Khomenko, E.; Kuckein, C.; Asensio Ramos, A.; Balthasar, H.; Berkefeld, T.; Denker, C.; Feller, A.; Franz, M.; Hofmann, A.; Joshi, J.; Kiess, C.; Lagg, A.; Nicklas, H.; Orozco Suárez, D.; Pastor Yabar, A.; Rezaei, R.; Schlichenmaier, R.; Schmidt, D.; Schmidt, W.; Sigwarth, M.; Sobotka, Michal; Solanki, S.K.; Soltau, D.; Staude, J.; Strassmeier, K.G.; Volkmer, R.; von der Lühe, O.; Waldmann, T.A.

2016-01-01

Roč. 596, December (2016), A59/1-A59/13 ISSN 0004-6361 EU Projects: European Commission(XE) 312495 - SOLAR NET Institutional support: RVO:67985815 Keywords : Sun * photosphere * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

The SILCC (SImulating the LifeCycle of molecular Clouds) project II. Dynamical evolution of the supernova-driven ISM and the launching of outflows

Czech Academy of Sciences Publication Activity Database

Girichidis, P.; Walch, S.; Naab, T.; Gatto, A.; Wünsch, Richard; Glover, S.C.O.; Klessen, R.S.; Clark, P.C.; Peters, T.; Derigs, D.; Baczynski, C.

2016-01-01

Roč. 456, č. 4 (2016), s. 3432-3455 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : hydrodynamics * magnetic fields * numerical methods Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

The 3D MHD code GOEMHD3 for astrophysical plasmas with large Reynolds numbers Code description, verification, and computational performance

Czech Academy of Sciences Publication Activity Database

Skála, Jan; Baruffa, F.; Rampp, M.

2015-01-01

Roč. 580, August (2015), A48-A48 ISSN 0004-6361 R&D Projects: GA ČR GA13-24782S Institutional support: RVO:67985815 Keywords : magnetohydrodynamics * corona * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Sources of Quasi-periodic Pulses in the Flare of 18 August 2012

Czech Academy of Sciences Publication Activity Database

Altyntsev, A.; Meshalkina, N.; Mészárosová, Hana; Karlický, Marian; Palshin, V.; Lesovoi, S.

2016-01-01

Roč. 291, č. 2 (2016), s. 445-463 ISSN 0038-0938 R&D Projects: GA ČR GAP209/12/0103 Institutional support: RVO:67985815 Keywords : radio emission * active regions * oscillations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.682, year: 2016

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation

Czech Academy of Sciences Publication Activity Database

Ortiz, J.L.; Santos-Sanz, P.; Sicardy, B.; Benedetti-Rossi, G.; Berard, D.; Morales, N.; Duffard, R.; Braga-Ribas, F.; Hopp, U.; Ries, C.; Hornoch, Kamil; Pravec, Petr

2017-01-01

Roč. 550, č. 7675 (2017), s. 219-223 ISSN 0028-0836 Institutional support: RVO:67985815 Keywords : 2003 EL61 * Kuiper-belt * photometric -observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 40.137, year: 2016

The possibilities of CCD photometry of optical afterglows of GRBs

Czech Academy of Sciences Publication Activity Database

Šimon, Vojtěch; Polášek, Cyril; Jelínek, M.; Hudec, René; Štrobl, Jan

-, č. 125 (2010), s. 24-28 ISSN 1801-5964. [Conference on Variable Stars Research /41./. Prague, 27.11.2009-29.11.2009] Institutional research plan: CEZ:AV0Z10030501 Keywords : gamma-ray bursts * optical afterglows * CCD photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Comparing simulations of ionization triggered star formation and observations in RCW 120

Czech Academy of Sciences Publication Activity Database

Walch, S.; Whitworth, A.; Bisbas, T.; Hubber, D.A.; Wünsch, Richard

2015-01-01

Roč. 452, č. 3 (2015), s. 2794-2803 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : hydrodynamics * stars formation * ISM bubbles Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

STARBENCH: the D-type expansion of an H II region

Czech Academy of Sciences Publication Activity Database

Bisbas, T.; Haworth, T.J.; Williams, R.J.R.; Mackey, J.; Trembling, P. M.; Raga, A.C.; Arthur, S.J.; Baczynski, C.; Dale, J.; Frostholm, T.; Geen, S.; Haugbolle, T.; Hubber, D.A.; Iliev, I.T.; Kuiper, R.; Rosdahl, J.; Sullivan, D.; Walch, S.; Wünsch, Richard

2015-01-01

Roč. 453, č. 2 (2015), s. 1324-1343 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : hydrodynamics * numerical methods * ISM bubbles Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

The SILCC (SImulating the LifeCycle of molecular Clouds) project - I. Chemical evolution of the supernova-driven ISM

Czech Academy of Sciences Publication Activity Database

Walch, S.; Girichidis, P.; Naab, T.; Gatto, A.; Glover, S.C.O.; Wünsch, Richard; Klessen, R.S.; Clark, P.C.; Peters, T.; Derigs, D.; Baczynski, C.

2015-01-01

Roč. 454, č. 1 (2015), s. 238-268 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : magnetodydrodynamics * ISM clouds * ISM evolution Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies

Czech Academy of Sciences Publication Activity Database

Izotov, Y.I.; Schaerer, D.; Thuan, T.X.; Worseck, G.; Guseva, N.G.; Orlitová, Ivana; Verhamme, A.

2016-01-01

Roč. 461, č. 4 (2016), s. 3683-3701 ISSN 0035-8711 R&D Projects: GA ČR(CZ) GP14-20666P Institutional support: RVO:67985815 Keywords : fundamental parameters * abundances * ISM Subject RIV: BN - Astronomy , Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Radar meteors range distribution model. I. Theory

Czech Academy of Sciences Publication Activity Database

Pecinová, Drahomíra; Pecina, Petr

2007-01-01

Roč. 37, č. 2 (2007), s. 83-106 ISSN 1335-1842 R&D Projects: GA ČR GA205/03/1405 Institutional research plan: CEZ:AV0Z10030501 Keywords : physics of meteors * radar meteors * range distribution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Radar meteors range distribution model. II. Shower flux density and mass distribution index

Czech Academy of Sciences Publication Activity Database

Pecinová, Drahomíra; Pecina, Petr

2007-01-01

Roč. 37, č. 2 (2007), s. 107-124 ISSN 1335-1842 R&D Projects: GA ČR GA205/03/1405 Institutional research plan: CEZ:AV0Z10030501 Keywords : physics of meteors * radar meteors * range distribution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Density, porosity and magnetic susceptibility of the Košice meteorite shower and homogeneity of its parent meteoroid

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Havrila, K.; Tóth, J.; Husárik, M.; Gritsevich, M.; Britt, D.; Borovička, Jiří; Spurný, Pavel; Igaz, A.; Svoreň, J.; Kornoš, L.; Vereš, P.; Koza, J.; Zigo, P.; Gajdoš, Š.; Világi, J.; Čapek, David; Krišandová, Z.; Tomko, D.; Šilha, J.; Schunová, E.; Bodnárová, M.; Búzová, D.; Krejčová, T.

93/94, April (2014), s. 96-100 ISSN 0032-0633 R&D Projects: GA MŠk LH12079 Institutional support: RVO:67985831 ; RVO:67985815 Keywords : porosity * density * H chondrite * meteorite * Kosice Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.875, year: 2014

Radar meteors range distribution model. III. Ablation, shape-density and self-similarity parameters

Czech Academy of Sciences Publication Activity Database

Pecinová, Drahomíra; Pecina, Petr

2007-01-01

Roč. 37, č. 3 (2007), s. 147-160 ISSN 1335-1842 R&D Projects: GA ČR GA205/03/1405 Institutional research plan: CEZ:AV0Z10030501 Keywords : physics of meteors * radar meteors * range distribution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Exceptional Fireball Activity of Orionids in 2006

Czech Academy of Sciences Publication Activity Database

Spurný, Pavel; Shrbený, Lukáš

2008-01-01

Roč. 102, 1-4 (2008), s. 141-150 ISSN 0167-9295 Grant - others:EU(XE) MRTN-CT-2006-035519 Institutional research plan: CEZ:AV0Z10030501 Keywords : orionids * fireball * trajectory Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.033, year: 2008

Theoretical modelling of the AGN iron line vs. continuum time-lags in the lamp-post geometry

Czech Academy of Sciences Publication Activity Database

Epitropakis, A.; Papadakis, I.E.; Dovčiak, Michal; Pecháček, Tomáš; Emmanoulopoulos, D.; Karas, Vladimír; Hardy, I.M.M.

2016-01-01

Roč. 594, October (2016), A71/1-A71/17 ISSN 0004-6361 EU Projects: European Commission(XE) 312789 Institutional support: RVO:67985815 Keywords : active galaxies * X-rays * accretion disks Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Radar meteors range distribution model. IV. Ionization coefficient

Czech Academy of Sciences Publication Activity Database

Pecinová, Drahomíra; Pecina, Petr

2008-01-01

Roč. 38, č. 1 (2008), s. 12-20 ISSN 1335-1842 R&D Projects: GA ČR GA205/03/1405 Institutional research plan: CEZ:AV0Z10030501 Keywords : physics of meteors * radar meteors * range distribution Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Normal and counter Evershed flows in the photospheric penumbra of a sunspot SPINOR 2D inversions of Hinode-SOT/SP observations

Czech Academy of Sciences Publication Activity Database

Siu-Tapia, A.; Lagg, A.; Solanki, S.K.; van Noort, M.; Jurčák, Jan

2017-01-01

Roč. 607, November (2017), A36/1-A36/17 E-ISSN 1432-0746 Institutional support: RVO:67985815 Keywords : sunspots * photosphere * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.014, year: 2016

The perihelion of Mercury advance and the light bending calculated in (enhanced) Newton's theory

Czech Academy of Sciences Publication Activity Database

Abramowicz, M. A.; Ellis, G. F. R.; Horák, Jiří; Wielgus, M.

2014-01-01

Roč. 46, č. 1 (2014), 1630/1-1630/14 ISSN 0001-7701 Grant - others:AV ČR(CZ) M100031242 Institutional support: RVO:67985815 Keywords : space curvature * Newton's gravity * Perihelion advance Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.771, year: 2014

Total mass of six quiescent prominences estimated from their multi-spectral observations

Czech Academy of Sciences Publication Activity Database

Schwartz, Pavol; Heinzel, Petr; Kotrč, Pavel; Fárník, František; Kupryakov, Yu. A.; DeLuca, E. E.; Golub, L.

2015-01-01

Roč. 574, February (2015), A62/1-A62/18 ISSN 0004-6361 R&D Projects: GA ČR GAP209/12/0906 Institutional support: RVO:67985815 Keywords : Sun * filaments * prominences Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Clumps and triggered star formation in ionized molecular clouds

Czech Academy of Sciences Publication Activity Database

Walch, S.; Whitworth, A.; Bisbas, T.; Wünsch, Richard; Hubber, D.A.

2013-01-01

Roč. 435, č. 2 (2013), s. 917-927 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : hydrodynamics * stars formation * ISM bubbles Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.226, year: 2013

New insight into the origin of anomalous magnetism of titanohematite lamellae in rhombohedral oxide assemblages -consequence for Mars magnetism

Czech Academy of Sciences Publication Activity Database

Kletetschka, Günther; Zbořil, R.; Adachi, T.; Mikula, V.; Heřmánek, M.; Wasilewski, P. J.

2007-01-01

Roč. 88, č. 23 (2007), GP33A-07 ISSN 0096-3941. [American Geophysical Union ; Joint Assembly. 22.05.2007-25.05.2007, Acapulco] Institutional research plan: CEZ:AV0Z30130516 Keywords : titanohematite * magnetization * magnetic anomalies Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

The Use of Resonant Orbits in Satellite Geodesy: A Review

Czech Academy of Sciences Publication Activity Database

Klokočník, Jaroslav; Gooding, R. H.; Wagner, C. A.; Kostelecký, J.; Bezděk, Aleš

2013-01-01

Roč. 34, č. 1 (2013), s. 43-72 ISSN 0169-3298 Grant - others:ESA(XE) ESA- PECS project No. 98056 Institutional support: RVO:67985815 Keywords : satellite geodesy * Earth's gravitational field * geopotential Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.112, year: 2013

Comparison of 30 THz impulsive burst time development to microwaves, H alpha, EUV, and GOES soft X-rays

Czech Academy of Sciences Publication Activity Database

Miteva, R.; Kaufmann, P.; Cabezas, D.B.; Cassiano, M.M.; Fernandes, L.O.; Freeland, S.L.; Karlický, Marian; Kerdraon, A.; Kudaka, A.S.; Luoni, M.L.; Marcon, R.; Raulin, J.-P.; Trottet, G.; White, S.M.

2016-01-01

Roč. 586, February (2016), A91/1-A91/1 ISSN 0004-6361 R&D Projects: GA ČR GAP209/12/0103 Institutional support: RVO:67985815 Keywords : Sun * flares * chromosphere Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.378, year: 2014

Photometry and imaging of Comet 103P/Hartley in the 2010-2011 apparition

Czech Academy of Sciences Publication Activity Database

Milani, G.; Bryssinck, E.; Nicolini, M.; Mikuž, H.; Sostero, G.; Bacci, P.; Borghini, W.; Castellano, D.; Facchini, M.C.; Favero, G.; Galli, G.; Guidou, E.; Hausler, B.; Hornoch, Kamil; Howes, N.; Ligustri, R.; Perrella, C.; Prosperi, E.; Skvarc, J.; Srba, J.; Trabatti, R.; Vinante, C.; Szabo, G.

2013-01-01

Roč. 222, č. 2 (2013), s. 786-798 ISSN 0019-1035 R&D Projects: GA ČR GA205/09/1107 Institutional support: RVO:67985815 Keywords : comet s * dust * photometry Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 2.840, year: 2013

Dispersal of molecular clouds by ionizing radiation

Czech Academy of Sciences Publication Activity Database

Walch, S.K.; Whitworth, A.; Bisbas, T.; Wünsch, Richard; Hubber, D.A.

2012-01-01

Roč. 427, č. 1 (2012), s. 625-636 ISSN 0035-8711 R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : stars formation * hydrodynamics * ISM bubbles Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 5.521, year: 2012

New Improved Indirect Measurement of the F-19(p, alpha)O-16 Reaction at Energies of Astrophysical Relevance

Czech Academy of Sciences Publication Activity Database

Indelicato, I.; La Cognata, M.; Spitaleri, C.; Burjan, Václav; Cherubini, S.; Gulino, M.; Hayakawa, S.; Hons, Zdeněk; Kroha, Václav; Lamia, L.; Mazzocco, M.; Mrázek, Jaromír; Pizzone, R. G.; Romano, S.; Strano, E.; Torresi, D.; Tumino, A.

2017-01-01

Roč. 845, č. 1 (2017), č. článku 19. ISSN 0004-637X Institutional support: RVO:61389005 Keywords : nuclear reactions * nucleosynthesis * abundances Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.533, year: 2016

Lunar Magnetism: IRMs Normalization and Impact Related Magnetization

Czech Academy of Sciences Publication Activity Database

Fuller, M.; Halekas, J.; Adachi, T.; Kletetschka, Günther; Kohout, Tomáš

2007-01-01

Roč. 88, č. 23 (2007), P23A-06 ISSN 0096-3941. [American Geophysical Union ; Joint Assembly. 22.05.2007-25.05.2007, Acapulco] Institutional research plan: CEZ:AV0Z30130516 Keywords : Moon * magnetization * impact Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Trojan Horse Particle Invariance: An Extensive Study

Czech Academy of Sciences Publication Activity Database

Pizzone, R. G.; Spitaleri, C.; Sergi, M. L.; Lamia, L.; Tumino, A.; Bertulani, C. A.; Blokhintsev, L.; Burjan, Václav; Kroha, Václav; La Cognata, M.; Mrázek, Jaromír; Mukhamedzhanov, A. M.; Sparta, R.

2014-01-01

Roč. 55, 8-10 (2014), s. 1001-1004 ISSN 0177-7963 R&D Projects: GA MŠk(XE) LM2011019 Institutional support: RVO:61389005 Keywords : astrophysical implications * nuclear astrophysics * destruction Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.768, year: 2014

Covariances of smoothed observational data

Czech Academy of Sciences Publication Activity Database

Vondrák, Jan; Čepek, A.

2000-01-01

Roč. 40, 5-6 (2000), s. 42-44 ISSN 1210-2709 R&D Projects: GA ČR GA205/98/1104 Institutional research plan: CEZ:AV0Z1003909 Keywords : digital filter * smoothing * estimation of uncertainties Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

YETI observations of the young transiting planet candidate CVSO 30 b

Czech Academy of Sciences Publication Activity Database

Raetz, S.; Schmidt, T.O.B.; Czesla, S.; Klocova, T.; Holmes, L.; Errmann, R.; Kitze, M.; Fernández, M.; Sota, A.; Briceno, C.; Hernandez, J.; Downes, J.J.; Dimitrov, D.P.; Kjurkchieva, D.; Radeva, V.; Wu, Z.-Y.; Zhou, X.; Takahashi, H.; Henych, Tomáš; Seeliger, M.; Mugrauer, M.; Adam, Ch.; Marka, C.; Schmidt, J.G.; Hohle, M.M.; Ginski, Ch.; Pribulla, T.; Trepl, L.; Moualla, M.; Pawellek, N.; Gelszinnis, J.; Buder, S.; Masda, S.; Maciejewski, G.; Neuhauser, R.

2016-01-01

Roč. 460, č. 3 (2016), s. 2834-2852 ISSN 0035-8711 R&D Projects: GA MŠk LG14013 Institutional support: RVO:67985815 Keywords : individual starws * planetary systems * pre-main-sequence Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.961, year: 2016

Inflows, Outflows, and a Giant Donor in the Remarkable Recurrent Nova M31N 2008-12a?-Hubble Space Telescope Photometry of the 2015 Eruption

Czech Academy of Sciences Publication Activity Database

Darnley, M.J.; Hounsell, R.; Godon, M.; Perley, D.A.; Henze, M.; Kuindersma, S.; Williams, B. F.; Williams, S.C.; Bode, M.F.; Harman, D. J.; Hornoch, Kamil; Link, M.; Ness, J.-U.; Ribeiro, V.A.R.M.; Sion, E. M.; Shafter, A.W.; Shara, M. M.

2017-01-01

Roč. 849, č. 2 (2017), 96/1-96/17 ISSN 0004-637X Institutional support: RVO:67985815 Keywords : accretion * accretion disks * cataclysmic variables Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics OBOR OECD: Astronomy (including astrophysics,space science) Impact factor: 5.533, year: 2016

CCD characterization and measurements automation

Czech Academy of Sciences Publication Activity Database

Kotov, I.V.; Frank, J.; Kotov, A.I.; Kubánek, Petr; O´Connor, P.; Prouza, Michael; Radeka, V.; Takacs, P.

2012-01-01

Roč. 695, Dec (2012), 188-192 ISSN 0168-9002 R&D Projects: GA MŠk ME09052 Institutional research plan: CEZ:AV0Z10100502 Keywords : CCD * characterization * test automation Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.142, year: 2012

Ultrasensitive Determination of 81Kr-Kr Cosmic Ray Exposure Ages of Eucrites and Bunburra Rockhole

Czech Academy of Sciences Publication Activity Database

Strashnov, I.; Bland, P.A.; Spurný, Pavel; Towner, M.C.; Gilmour, D.J.

2011-01-01

Roč. 46, Supplement (2011), A226-A226 ISSN 1086-9379. [Annual Meeting of the Meteoritical Society /74./. 08.08.2011-12.08.2011, London] Institutional research plan: CEZ:AV0Z10030501 Keywords : Bunburra Rockhole Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Dusty Supernovae Running the Thermodynamics of the Matter Reinserted within Young and Massive Super Stellar Clusters

Czech Academy of Sciences Publication Activity Database

Tenorio-Tagle, G.; Silich, S.; Martínez-Gonzáléz, Sergio; Munoz-Tunon, C.; Palouš, Jan; Wünsch, Richard

2013-01-01

Roč. 778, č. 2 (2013), 159/1-159/6 ISSN 0004-637X R&D Projects: GA ČR GAP209/12/1795 Institutional support: RVO:67985815 Keywords : dust * extinction * galaxie Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 6.280, year: 2013

QPOs and Resonance in Accretion Disks

Czech Academy of Sciences Publication Activity Database

Kluzniak, W.; Abramowicz, M. A.; Bursa, Michal; Török, G.

2007-01-01

Roč. 27, Marzo 2007 (2007), s. 18-25 ISSN 1405-2059 R&D Projects: GA AV ČR IAA300030510 Institutional research plan: CEZ:AV0Z10030501 Keywords : quasi-periodic oscillations * accretion disks * general relativity Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Unraveling the nature of B[e] star candidates

Czech Academy of Sciences Publication Activity Database

Arias, M.L.; Torres, A.F.; Cidale, L.S.; Kraus, Michaela

2013-01-01

Roč. 56, č. 1 (2013), s. 171-174 E-ISSN 1669-9521 Institutional support: RVO:67985815 Keywords : Be star * massive star * spectroscopic observations Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics http://www. astronomia argentina.org.ar/b56/2013baaa...56...171A.pdf

Solar synoptic telescope. Characteristics, possibilities, and limits of design

Czech Academy of Sciences Publication Activity Database

Klvaňa, Miroslav; Sobotka, Michal; Švanda, Michal

2011-01-01

Roč. 41, č. 2 (2011), s. 92-98 ISSN 1335-1842 R&D Projects: GA AV ČR IAA300030808 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun * telescopes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 0.152, year: 2011

Dynamics of Magnetic Bright Points in an Active Region

Czech Academy of Sciences Publication Activity Database

Möstl, C.; Hanslmeier, A.; Sobotka, Michal; Puschmann, K.G.; Muthsam, H. J.

2006-01-01

Roč. 237, č. 1 (2006), s. 13-23 ISSN 0038-0938 Grant - others:FWF(AT) P-17024 Institutional research plan: CEZ:AV0Z10030501 Keywords : Sun * photosphere * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.887, year: 2006

Heating and cooling of protons in the fast solar wind between 0.3 and 1 AU: Helios revisited

Czech Academy of Sciences Publication Activity Database

Hellinger, Petr; Matteini, L.; Štverák, Štěpán; Trávníček, Pavel M.; Marsch, E.

2011-01-01

Roč. 116, - (2011), A09105/1-A09105/9 ISSN 0148-0227 Institutional research plan: CEZ:AV0Z10030501; CEZ:AV0Z30420517 Keywords : temperature anisotropy * equation * multicomponent Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.021, year: 2011

Statistical and regression analyses of detected extrasolar systems

Czech Academy of Sciences Publication Activity Database

Pintr, Pavel; Peřinová, V.; Lukš, A.; Pathak, A.

2013-01-01

Roč. 75, č. 1 (2013), s. 37-45 ISSN 0032-0633 Institutional support: RVO:61389021 Keywords : Exoplanets * Kepler candidates * Regression analysis Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.630, year: 2013 http://www.sciencedirect.com/science/article/pii/S0032063312003066

Space weathering simulations through controlled growth of iron nanoparticles on olivine

Czech Academy of Sciences Publication Activity Database

Kohout, Tomáš; Čuda, J.; Filip, J.; Britt, D.; Bradley, T.; Tuček, J.; Skála, Roman; Kletetschka, Günther; Kašlík, J.; Malina, O.; Šišková, K.; Zbořil, R.

2014-01-01

Roč. 237, 15 July (2014), s. 75-83 ISSN 0019-1035 R&D Projects: GA MŠk LH12079 Institutional support: RVO:67985831 Keywords : asteroids, surface * Moon, surface * regoliths * spectroscopy Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 3.038, year: 2014

March 1, 2005 Daylight Fireball Over Galicia (NW of Spain) and Minho (N. Portugal)

Czech Academy of Sciences Publication Activity Database

Docobo, J. A.; Trigo-Rodríguez, J.M.; Borovička, Jiří; Tamazian, V.; Fernandes, V.A.; Llorca, J.

2008-01-01

Roč. 102, 1-4 (2008), s. 537-542 ISSN 0167-9295. [Meteoroids 2007. Barcelona, 11.06.2007-15.06.2007] Institutional research plan: CEZ:AV0Z10030501 Keywords : meteors * meteoroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.033, year: 2008

Orbit and dynamic origin of the recently recovered Annama's H5 chondrite

Czech Academy of Sciences Publication Activity Database

Trigo-Rodríguez, J.M.; Lyytinen, E.; Gritsevich, M.; Moreno-Ibanez, M.; Bottke, W. F.; Williams, I.; Lupovka, V.; Dmitriev, V.; Kohout, Tomáš; Grokhovsky, V.

2015-01-01

Roč. 449, č. 2 (2015), s. 2119-2127 ISSN 0035-8711 R&D Projects: GA MŠk LH12079 Institutional support: RVO:67985831 Keywords : meteorites * meteors * meteoroids * minor planets * asteroids Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.952, year: 2015

Kinetic theory of equilibrium axisymmetric collisionless plasmas in off-equatorial tori around compact objects

Czech Academy of Sciences Publication Activity Database

Cremaschini, C.; Kovář, J.; Slaný, P.; Stuchlík, Z.; Karas, Vladimír

2013-01-01

Roč. 209, č. 15 (2013), s. 1-12 ISSN 0067-0049 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion * gravitation * black holes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 14.137, year: 2013

Oblique magnetic fields and the role of frame dragging near a rotating black hole

Czech Academy of Sciences Publication Activity Database

Karas, Vladimír; Kopáček, Ondřej; Kunneriath, Devaky; Hamerský, Jaroslav

2014-01-01

Roč. 54, č. 6 (2014), s. 398-413 ISSN 1210-2709 R&D Projects: GA ČR GB14-37086G; GA MŠk(CZ) LH14049 Institutional support: RVO:67985815 Keywords : black holes * accretion discs Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Black hole spin dependence of general relativistic multi-transonic accretion close to the horizon

Czech Academy of Sciences Publication Activity Database

Das, T. K.; Nag, S.; Hedge, S.; Bhattacharya, S.; Maity, I.; Czerny, B.; Barai, P.; Wiita, P. J.; Karas, Vladimír; Naskar, T.

2015-01-01

Roč. 37, May (2015), s. 81-104 ISSN 1384-1076 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : black holes * accretion discs Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.085, year: 2015

A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign

Czech Academy of Sciences Publication Activity Database

Zola, S.; Valtonen, M.J.; Bhatta, G.; Goyal, A.; Debski, B.; Baran, A.; Krzesinski, J.; Siwak, M.; Ciprini, S.; Gopakumar, A.; Hudec, René; Jelínek, Martin; Štrobl, Jan

2016-01-01

Roč. 4, č. 4 (2016), 41/1-41/7 E-ISSN 2075-4434 Grant - others:GA ČR(CZ) GA13-33324S Institutional support: RVO:67985815 Keywords : active galaxies * BL Lacertae objects * supermassive black holes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics