Combined astrometric catalogue EOC-2 - an improved reference frame for long-term Earth rotation studies

Details Combined astrometric catalogue EOC-2 - an improved reference frame for long-term Earth rotation studies Combined astrometric catalogue EOC-2 - an improved reference frame for long-term Earth rotation studies

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..210v&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

2

Astrometric Catalogues, Earth Orientation Parameters

Scientific paper

We collected the astrometric observations of latitude / universal time variations made worldwide at 33 observatories. These observations, referred to Hipparcos Catalogue, were then used to determine Earth Orientation Parameters (EOP) at 5-day intervals, covering the interval 1899.7-1992.0. Later on, new astrometric catalogues (such as ARIHIP or TYCHO-2) appeared as combination of Hipparcos / Tycho positions with ground-based catalogues. These catalogues yield more accurate proper motions than original Hipparcos Catalogue. Our attempt goes however even further - we use about 4.5 million observations of latitude / universal time variations, and combine them with these catalogues to obtain Earth Orientation Catalogue (EOC). The second version of the catalogue, EOC-2, contains 4418 different objects (stars, components of double stars, photocenters). The improvement of the accuracy of proper motions (especially in declination) over Hipparcos is remarkable - median formal inaccuracies attain 0.70 and 0.35 mas/year in right ascension and declination, respectively.

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