Global Astrometric Sphere Reconstruction in Gaia. Challenges and First Results of the Verification Unit

Details Global Astrometric Sphere Reconstruction in Gaia. Challenges and First Results of the Verification Unit Global Astrometric Sphere Reconstruction in Gaia. Challenges and First Results of the Verification Unit

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1704v&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

Gaia will estimate the astrometric and physical data of approximately one billion objects. The core of this process, the global sphere reconstruction, is represented by the reduction of a subset of these objects, which will constitute the largest and most precise catalog of absolute astrometry in the history of Astronomy, and will put General Relativity to test by estimating the PPN parameter γ with unprecedented accuracy. As the Hipparcos mission showed, and as it is natural for all kind of absolute measurements, possible errors in the data reduction can hardly be identified at the end of the processing, and can lead to systematic errors in all the works which will use these results. In order avoid such kind of problems, a Verification Unit was established by the Gaia Data Processing and Analysis Consortium (DPAC). One of its jobs is to implement and perform an independent global sphere reconstruction, parallell to the baseline one, to compare the two results, and to report any significant difference.
We will present here how we dealt with the challenges of such a task, and the first results obtained so far.

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