Positions and parallaxes from the HIPPARCOS satellite - A first attempt at a global astrometric solution

Details Positions and parallaxes from the HIPPARCOS satellite - A first attempt at a global astrometric solution Positions and parallaxes from the HIPPARCOS satellite - A first attempt at a global astrometric solution

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..134l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 1, p. 134-141.

Astronomy and Astrophysics

Astronomy

22

Astrometry, Data Reduction, Hipparcos Satellite, Position (Location), Sky Surveys (Astronomy), Accuracy, Astronomical Catalogs, Great Circles, Stellar Motions, Stellar Parallax

Scientific paper

The last stage of the basic astrometric reduction of Hipparcos data is to combine angular measurements along great-circle scans into a globally coherent system of positions, proper motions and trigonometric parallaxes. We report the results of a first attempt at such a 'sphere solution' of positions and parallaxes using great-circle results calculated from a selection of the data collected between November 1989 and February 1991. The data, which were made available to the reduction consortia for test and validation purposes, constitute less than a fifth of the total data collected during that period. The solution included some 20,000 stars, and for at least 10,000 stars we have determined the positions at mid-epoch with an accuracy of about 5 milli-arcsec and the trigonometric parallaxes with an average external standard error of 7 milli-arcsec. The positions reveal systematic errors in the Hipparcos Input Catalogue of up to 0.2 arcsec, some of which can probably be traced back to zonal errors in the FK4 and/or FK5 system.

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