2002/02/28 by P. T. de Zeeuw, de Zeeuw, P. T.
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0202518
To appear in: The Dynamics, Structure & History of Galaxies, a conference in honor of Ken Freeman. ASP Conference Series, eds G.S. Da Costa & E.M. Sadler. 10 pages, 2 figures
arxiv created 2002/02/28 · arxiv updated 2009/12/01
The GAIA space observatory was recently approved as Cornerstone 6 of ESA's science program, to be launched no later than mid-2012. It will provide a stereoscopic and kinematic census of about 109 stars throughout our Galaxy (and into the Local Group) complete to V=20 mag, amounting to about 1% of the Galactic stellar population. Combined with astrophysical information for each star, provided by on-board multi-colour photometry and (limited) spectroscopy, the positional and radial velocity measurements will have the precision necessary to quantify the early formation, and subsequent dynamical, chemical and star formation evolution of our Galaxy: GAIA will establish when the stars in our Galaxy formed, when and how the Galaxy was assembled, and how the dark matter is distributed. The GAIA data will also allow detection and orbital classification of ~5 x 104 extra-Solar planetary systems, provide a comprehensive survey of 105-106 minor bodies in our Solar System, of galaxies in the nearby Universe, of some 5 x 105 quasars, and will test general relativity and cosmology.