Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1602m&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 European space astrometry mission Gaia is due for launch in early 2012 and will bring astrometry measurements in the range of 10 muas in absolute astrometry. Among the multiple challenges facing this mission one is related to the very accurate modelling of the measurements at the sub-muas level, which is achieved in the framework of general relativity. I will outline the main features of the light path model set up for Gaia with a particular emphasis on the space and time standards used all the way through the data processing together with the extreme care exercised to derive the relationship between the on-board time and a relativistic coordinate timescale. In a second part I will comment on the different kinds of testing of special and general relativity that can be performed with Gaia observations, in particular those based on the wide or small angle mapping of the gravitational light deflection.
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