Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.0201m&link_type=abstract
American Astronomical Society, DDA meeting #30, #02.01; Bulletin of the American Astronomical Society, Vol. 30, p.1140
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Hipparcos Catalogue was formally made available to the astronomers on July 1st, 1997 and its various product are accessible through the CDS in Strasbourg. In this talk I will spell out the very principles and objectives of the Hipparcos astrometric mission carried out by the European Space Agency, while the data analysis was realized by fairly large number of scientists of Western Europe. The main goal was to perform millisecond accurate observations of 120 000 stars down to magnitude 12.5, in order to determine their positions, proper motions and parallaxes. The results are very impressive and better by a factor two than the most optimistic pre-launch expectations. In addition, an homegenous survey of binary stars has been completed together with systematic multi-epoch photometric measurements of all the stars with an accuracy of 0.01 mag. I will discuss the reliability of these results and present the first applications of the Catalogue to astrophysics problems, such as the luminosity calibration, the structure and distance of the Hyades, the age problem and the determination of several tens stellar masses. In conclusion, indications on the future of space astrometry with the American SIM and European GAIA will be given.
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