Abstract
The astrometric mission GAIA will provide a flux limited census of quasi stellar objects to V=20 mag. This paper addresses the main physical and observational properties of the quasars, the existing surveys and the relevant statistical distributions of the compilation catalogue of Veron-Cetty & Veron. Then I consider the detection and recognition with GAIA which should be based on the multicolour photometry complemented by hints on the parallaxes and proper motions. In the last section I discuss the possibility to materialize directly in the optical the quasi-inertial frame to the sub- μ as accuracy. It is shown that that with a clean sample of less than 10 000 quasars the residual spin of the GAIA reference frame can be determined to 0.5 μ as yr -1 .
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