Relativistic Tests from the Motion of the Asteroids

Details Relativistic Tests from the Motion of the Asteroids Relativistic Tests from the Motion of the Asteroids

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.2600h&link_type=abstract

"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an

Astronomy and Astrophysics

Astronomy

Gaia, Astrometry, Ppn, Asteroids, Neos, Orbit, Variance Analysis

Scientific paper

Because of their negligible mass and size, asteroids act as particle test in the gravitational field of the Sun (or the solar system at large); hence the knowledge of their orbit can provide local tests of general relativity. In addition to the "3D census of the Galaxy" the space-mission Gaia will enable, this ESA astrometric mission will provide highly accurate positions of a large number of solar systems objects. Given the expected nominal precision -- ranging from a few milli-arcseconds for the faintest bodies down to sub-mas precision for the brightest ones -- one can expect to perform the classical perihelion precession test of the GR from the motion of the asteroids. We present preliminary results of a variance analysis involving realistic simulations of a subset of asteroids including Near-Earth objects and main-belt asteroids that will be observed by Gaia. These show the formal precision achievable for the joint determination of the Solar J2 together with the PPN parameter β, as well as the precision for ˙ G/G and the link of the dynamical reference frame to the kinematically non-rotating conventional ICRS.

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