Determining PPN gamma with Gaia's astrometric core solution

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

The ESA space astrometry mission Gala, 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 gamma 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 gamma and the stellar parallaxes is considered. Extrapolating the results to a full-scale solution using some 100 million stars, we find that PPN gamma could be obtained to about 10(-6), which is significantly better than today's best estimate from the Cassini mission of 2 x 10(-5).

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology

Keywords

  • data analysis, gravitation, Astrometry, relativity
Original languageEnglish
Title of host publicationRelativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis (IAU Symposium)
PublisherCambridge University Press
Pages315-319
Volume261
Publication statusPublished - 2010
Publication categoryResearch
Peer-reviewedYes
Event261st Symposium of the International-Astronomical-Union - Virginia Beach, VA
Duration: 2009 Apr 272009 May 1

Publication series

Name
Volume261
ISSN (Print)1743-9221
ISSN (Electronic)1743-9213

Conference

Conference261st Symposium of the International-Astronomical-Union
Period2009/04/272009/05/01