Early results of the HIPPARCOS and the second HIPPARCOS project.

Details Early results of the HIPPARCOS and the second HIPPARCOS project. Early results of the HIPPARCOS and the second HIPPARCOS project.

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pabei..11...70x&link_type=abstract

Prog. Astron., Vol. 11, No. 1, p. 70 - 80

Astronomy and Astrophysics

Astronomy

Hipparcos: Space Astrometry, Hipparcos: Parallaxes, Hipparcos: Proper Motions

Scientific paper

The early results derived from the observations of HIPPARCOS from November 1989 to February 1991 are presented. During this period some 20000 stars were observed and for at least 10000 stars the positions at mid-epoch with an accuracy of about 5 mas and the trigonometric parallaxes with an average standard error of 7 mas have been determined. An examination of these early results constitutes a first validation of the HIPPARCOS project as a whole. The second plan of HIPPARCOS has been presented. The satellite has already been suggested to be launched in 1999. The structure and the function will be better than the present HIPPARCOS. The primary goals are to determine the positions, parallaxes and proper motions per year for 400000 stars with the expected precision namely 0″001 in three years.

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