Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..41s&link_type=abstract
Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200
Astronomy and Astrophysics
Astronomy
Scientific paper
The paper has been inspired with changes of the concepts and definitions concerning celestial reference systems and frames approved and recommended by the resolutions of the General Assembly of the International Astronomical Union. The paper presents an extensive discussion of the results of computations of apparent places of stars based on the FK5 catalogue data and the contemporary Hipparcos and FK6 catalogue data. Detailed analysis of the effect of fundamental catalogue data i.e. the differences between the old and contemporary catalogue data on the values of calculated apparent places of stars was made. The effect of changes of precession-nutation model and definition of the celestial reference system was analysed too. The paper contains also an analysis of time variability of the calculated apparent places and specifies the problems of interpolation and presentation of calculated data in a tabulated form used in the astronomical almanacs. The paper completes detailed results and conclusions drawn from the analyses and computations performed. These are: a conclusion of presence of large, reaching some hundreds of mas, systematic differences between the FK5 and Hipparcos catalogue data; showing the relative rotation of about 20 mas between FK5 and HCRF catalogue celestial reference frames; and pointing out the catalogue errors as the major source of the errors of calculated apparent places. Still, the switch from the FK5 to Hipparcos catalogue data and from FK5 to HCRF catalogue celestial reference frame gives an improvement in calculated apparent places accuracy by an order of magnitude.
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