Preliminary progress in the Hipparcos astrometry.

Details Preliminary progress in the Hipparcos astrometry. Preliminary progress in the Hipparcos astrometry.

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pabei..12..142w&link_type=abstract

Prog. Astron., Vol. 12, No. 2, p. 142 - 149

Astronomy and Astrophysics

Astronomy

Hipparcos: Space Astrometry

Scientific paper

Developments in space astrometry which are obtained from the observing data of the first two years collected by the Hipparcos satellite since the beginning of Hipparcos observation in September 1989 and the comparison between the results of the space observations and the ground observations are described. The astrometric parameters has been successfully calculated with 112,444 stars. The predicted accuracies of the positions, the trigonometric parallaxes and annual proper motions are 3, 4 and 2 mas respectively. These results examined the Hipparcos project as a whole, such as the satellite, its operation, the observing programme, "Input Catalogue", the processing of the Hipparcos data and the system of the data reduction software.

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