Zobrazeno 1 - 10
of 201
pro vyhledávání: '"J. Kovalevsky"'
Autor:
Dennis D. McCarthy, Catherine Y. Hohenkerk, Véronique Dehant, Patrick T. Wallace, S. lioner, P. K. Seidelmann, Alexandre Humberto Andrei, B. Guinot, Toshio Fukushima, Irina I. Kumkova, C. Ma, J. Kovalevsky, Mark Calabretta, George H. Kaplan, Nicole Capitaine
Publikováno v:
Proceedings of the International Astronomical Union. 1:59-62
A Division 1 Working Group on “Nomenclature for Fundamental Astronomy” (NFA) was formed at the 25th IAU GA in 2003 in order to provide proposals for the new nomenclature associated with the implementation of the IAU 2000 resolutions on reference
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::712f36bb78cb0cdc7d815a0e1d52728d
https://doi.org/10.1017/s1743921306004340
https://doi.org/10.1017/s1743921306004340
Autor:
J. Kovalevsky
Publikováno v:
Astronomy & Astrophysics. 404:743-747
Approved space astrometric missions (SIM, GAIA) are aiming at a few microarcseconds per year precision in yearly proper motions and even less than a microarcsecond in the definition of an extragalactic reference frame. At such a level of accuracy, th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9729adbd193debfa271b643da638933f
https://doi.org/10.1051/0004-6361:20030560
https://doi.org/10.1051/0004-6361:20030560
Autor:
P. K. Seidelmann, J. Kovalevsky
Publikováno v:
Astronomy & Astrophysics. 392:341-351
The IAU has introduced the International Celestial Reference System (ICRS), the Celestial Intermediate Pole (CIP), and the Celestial Ephemeris Origin (CEO) in order to be consistent with the improved accuracies currently achieved and expected in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d49fd3da69e6e4cc366f34f442e056d
https://doi.org/10.1051/0004-6361:20020931
https://doi.org/10.1051/0004-6361:20020931
Autor:
J. Kovalevsky
Publikováno v:
International Astronomical Union Colloquium. 180:1-9
The paper starts with a short presentation of the conceptual foundations of celestial reference systems and of the IAU decisions taken in 1991. The necessity to define and use them in the framework of General Relativity induces some difficulties that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f4d64b6ad61d03704a941551f469cbd
https://doi.org/10.1017/s025292110000004x
https://doi.org/10.1017/s025292110000004x
Autor:
T. E. Corbin, F. Noel, D. Polojentsev, W. Jin, R. Stone, L.V. Morrison, G. Pinigin, J. Xu, H. Schwan, J. A. Lopez, J. Kovalevsky
Publikováno v:
Transactions of the International Astronomical Union. 24:21-31
The present triennial commission report embraces mainly activities in wide angle, optical astrometry. With the successful development and application of new techniques from Earth (e.g. optical interferometry, CCD’s) and space (Hipparcos mission and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83eb92d8f1a62236c62d05a10db913d8
https://doi.org/10.1017/s0251107x00002558
https://doi.org/10.1017/s0251107x00002558
Autor:
J. Kovalevsky
In May 1962 the International Union of Theoretical and Applied Mechanics (IUTAM) organized a symposium in Paris on the theory of the movement of the Earth's artificial satellites designated to confront the results of the first spatial experiences wit
Autor:
J Kovalevsky
Publikováno v:
Reports on Progress in Physics. 61:77-115
First, the main objectives of astrometry are presented and the most important features or phenomena that intervene in the measurement of positions of celestial objects are shortly described. Then, the two classical astrometric techniques that are sti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::271a7edf046390bdbd78dc5e63fa19e2
https://doi.org/10.1088/0034-4885/61/2/001
https://doi.org/10.1088/0034-4885/61/2/001
Autor:
D. D. McCarthy, J. Kovalevsky
Publikováno v:
Highlights of Astronomy. 11:182-186
We present a first description of the changes in the current procedures that will have to be performed in order to take into account the adoption of the ICRS as the new reference system and new nutation-precession series. A number of choices will hav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a888bf68f29ca5bb45701b4958fddd6
https://doi.org/10.1017/s1539299600020384
https://doi.org/10.1017/s1539299600020384
Autor:
J.-F. Lestrade, D.L. Jones, R.A. Preston, R.B. Phillips, J. Kovalevsky, M. Froeschle, F. Mignard
Publikováno v:
Symposium - International Astronomical Union. 166:119-126
High-accuracy astrometric VLBI observations of 7 radio stars are presented with applications to the connection between the Hipparcos and VLBI extragalactic reference frames, to the identification of the radio emitting region in the ternary system Alg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9190b5eeb1c43e6f9817a0a128096469
https://doi.org/10.1017/s0074180900227952
https://doi.org/10.1017/s0074180900227952
Publikováno v:
Symposium - International Astronomical Union. 156:11-18
Using the first 12 months of HIPPARCOS mission data already reduced, a synthesis solution was obtained by both CERGA and ARI teams. The reduction includes two steps. In the first one the origins of individual reference circles are determined, thus co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d842dd5ed5b95a7cea96b6f2096a962
https://doi.org/10.1017/s0074180900172869
https://doi.org/10.1017/s0074180900172869