Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..196m&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
1
Gaia, Reference Frames, Space Astrometry
Scientific paper
The European space astrometry mission Gaia is scheduled for a launch in 2011 and aims to produce a complete sky survey down to V = 20 with an astrometric accuracy of 10 μas at V = 15. During its 5-year mission the satellite will also repeatedly measure the position of ~500,000 quasars in a consistent way, leading to a direct realisation of the primary inertial frame in the visible in the framework the ICRS concepts. At V = 20 the sky density of the QSOs is about 1000 times smaller than that of the stars at mid galactic latitude, and given their number and their stellar-like images, this implies the construction an automatic recognition scheme of the non stellar sources with a sensitivity of the order of one part in a thousand. In this paper I present the expected performance for the realisation of the reference frame and discuss the procedure under development to select the primary sources.
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