Determining PPN γ with Gaia's astrometric core solution

Details Determining PPN γ with Gaia's astrometric core solution Determining PPN γ with Gaia's astrometric core solution

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..261..315h&link_type=abstract

Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis, Proceedings of the International Astronomica

Astronomy and Astrophysics

Astronomy

3

Astrometry, Relativity, Gravitation, Data Analysis

Scientific paper

The ESA space astrometry mission Gaia, due for launch in early 2012, will in addition to its huge output of fundamental astrometric and astrophysical data also provide stringent tests of general relativity. In this paper we present an updated analysis of Gaia's capacity to measure the PPN parameter γ as part of its core astrometric solution. The analysis is based on small-scale astrometric solutions taking into account the simultaneous determination of stellar astrometric parameters and the satellite attitude. In particular, the statistical correlation between PPN γ and the stellar parallaxes is considered. Extrapolating the results to a full-scale solution using some 100 million stars, we find that PPN γ could be obtained to about 10-6, which is significantly better than today's best estimate from the Cassini mission of 2 × 10-5.

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