Improvement of Hipparcos Proper Motions in Declination

Details Improvement of Hipparcos Proper Motions in Declination Improvement of Hipparcos Proper Motions in Declination

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006seraj.172...41d&link_type=abstract

Serbian Astronomical Journal, Vol. 172, p. 41-51

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5

Astrometry, Reference Systems

Scientific paper

More than a decade elapsed after the HIPPARCOS ESA mission (ESA 1997) observations have been collected. This first astronomical satellite mission was less than 4 years long so that 1991.25 is the epoch of the HIPPARCOS Catalogue. Many other projects have checked or improved HIPPARCOS data. Also, a long series of ground - based optical observations of some stars included in HIPPARCOS Catalogue, made with Photographic Zenith Tubes (PZT) are useful for the task of improving the proper motions of these stars. The ARIHIP Catalogue (after ACT, TYCHO - 2, FK6, GC+HIP, TYC2+HIP) is a combination of the HIPPARCOS and some ground - based data, and the ARIHIP proper motions are more accurate than the HIPPARCOS ones. Here we present a new step of our procedure of calculation; between PZT data we added the HIPPARCOS position with suitable weight - the point with the coordinates (1991.25, 0ŭ0) in our case. The method was applied to 202 stars observed at Richmond PZTs in the course of a few decades. The result is better proper motions in declination for these HIPPARCOS stars, and a good agreement with ARIHIP proper motions (we found 128 common Richmond and ARIHIP stars to check our result). Also, we present the result for other 74 Richmond stars which are not found in ARIHIP.

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