MG11 
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Relativistic tests from the motion of asteroids

In addition to the '3D census of the Galaxy' it will enable, the European space mission Gaia will provide high accuracy positions of a large number of solar systems objects. Given the expected nominal precisions, ranging from a few milli-arcseconds (mas) for the faintest bodies down to sub-mas precision for the brightest ones, one can expect to perform a classical test of the GR based on the motion of the asteroids observed during the 5-year mission. We show and discuss preliminary results obtained on a realistic simulation of Gaia observations built on a subset of asteroids including both Near-Earth and main-belt objects. From these simulations one can assess the formal precision achievable for the joint determination of the Solar $J_2$ together with the PPN $\beta$, as well as the precision for $\dot{G}/G$ and the link of the dynamical reference frame to the kinematically non-rotating conventional frame.