Gaia and the Asteroids: Local Test of GR

Details Gaia and the Asteroids: Local Test of GR Gaia and the Asteroids: Local Test of GR

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.0909h&link_type=abstract

American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana

Astronomy and Astrophysics

Astronomy

Scientific paper

The ESA cornerstone mission Gaia, that will be launched in 2012, will observe--in addition to the stars and QSOs--a large number of asteroids with unprecedented photometric and--mostly--astrometric precisions. Indeed it is predicted that about 300,000 asteroids brighter than V<20; will be observed during the 5 years mission, with an expected nominal precision ranging from a few milli-arcsecond to sub-mas precision, depending on the target magnitude. While the majority of this sample is constituted of known main-belt asteroids, a substantial fraction will be made of near-Earth asteroids, and possibly some newly discovered inner-Earth or co-orbital objects.
Here we show the results obtained from a simulations of Gaia observations for the link of the dynamical reference frame to the conventional kinematically non-rotating reference frame (as obtained in the visible wavelength by Gaia observations of quasars).
The simulation takes into account the time sequences and geometry of the observations that are particular to Gaia observations of solar system objects, as well as the instrument sensitivity and photon noise. Additionally we show the results from a variance analysis for the nominal precision of the joint determination of the solar quadrupole J2 and the PPN parameter β. It is completed by the determination of a possible variation of the gravitational constant (dG/dt)/G, and deviation from Newtonian law. Comparisons to the results obtained from other techniques are also given.

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