Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002occn....8d..10f&link_type=abstract
Occultation Newsletter, International Occultation Timing Association (IOTA) (ISSN 0737-6766), Vol. 8, No. 4, p. 10 - 12 (January
Astronomy and Astrophysics
Astronomy
Space Missions, Astrometry, Gaia
Scientific paper
The GAIA mission will provide unprecedented astrometric and radial velocity measurements with the accuracy needed to produce a stereoscopic and kinematic census of about one billion stars in our Galaxy and the Local Group. The GAIA output catalogue will be complete down to V=20 mag. Astrometric data at 10 microarcsecond level at V=15 mag will ensure great accuracy for occultation programs and stellar distances with an uncertainty of 10% for stars as far as the Galactic Center. These data, combined with broad-band and intermediate-band photometry also obtained by GAIA, will yield reliable temperatures, intrinsic luminosities, chemical composition and thus evolutionary status for this huge amount of stars. Large numbers of galaxies and quasars will also be surveyed by GAIA, making unique contributions to extragalactic astronomy. Thousands of extrasolar planets will be detected and valuable inputs for tests of Relativity and Cosmology will be provided. A new perspective to the Solar System will be opened. It is expected that more than 105 NEOs and Kuiper Belt objects will be discovered. For the known asteroids, the predicted ephemeris errors based on the GAIA observations alone 100 years after the end of the mission will be over a factor of 30 better than the predicted ephemeris errors computed from the whole set of past and future ground-based observations. Measuring the tiny gravitational perturbations that asteroids experience in case of mutual close approaches, GAIA will allow more than 100 asteroid masses to be determined accurately.
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