Rotation matrix from the mean dynamical equator and equinox at J2000.0 to the ICRS

Autor:	C. Y. Hohenkerk, J. L. Hilton
Rok vydání:	2003
Předmět:	Physics International Celestial Reference System Space and Planetary Science Equatorial coordinate system Celestial equator Equator Astronomy Astronomy and Astrophysics Equinox Ephemeris Right ascension Celestial mechanics
Zdroj:	Astronomy & Astrophysics. 413:765-770
ISSN:	1432-0746 0004-6361
Popis:	Recommendation VII of Resolution A4 of the XXIst General Assembly of the International Astronomical Union (IAU 1992) states, in part, "... that the principal plane of the new conventional celestial reference system be as near as possible to the mean equator at J2000.0 and that the origin in this principal plane be as near as possible to the dynamical equinox of J2000.0, ..." The resulting International Celestial Reference System (ICRS), however, has a small, but significant, offset requiring a rotation matrix. The solutions for the offset between the mean dynamical pole of the Earth at J2000.0 and the pole of the ICRS determined by Lunar Laser Ranging (LLR) and Very Long Baseline Interferometry (VLBI) differ by several σ. Similarly, two different definitions have traditionally been used for the position of the mean equinox. Which of these poles and equinoxes should be used is application dependent. We have shown how the rotation matrix for the rotation from the mean dynamical equator and equinox at J2000.0 to the ICRS changes depending on the various assumptions made in constructing it.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7ebb69d7833de1061b82c8ce1efe4080 https://doi.org/10.1051/0004-6361:20031552 Zobrazit plný text záznamu