MG11 |
Participant |
Hestroffer, Daniel | |
Institution |
IMCCE/PAris observatory - 77 avenue Denfert-Rochereau - Paris - - FRANCE | |
Session |
Talk |
Abstract |
PT4 |
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. |