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Gaia: Astrometric performance and current status of the project

Published online by Cambridge University Press:  06 January 2010

Lennart Lindegren
Lennart Lindegren*
Affiliation:
Lund Observatory, Lund University, Box 43, SE-22100 Lund, Sweden email: lennart@astro.lu.se
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Abstract

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The scientific objectives of the Gaia mission cover areas of galactic structure and evolution, stellar astrophysics, exoplanets, solar system physics, and fundamental physics. Astrometrically, its main contribution will be the determination of millions of absolute stellar parallaxes and the establishment of a very accurate, dense and faint non-rotating optical reference frame. With a planned launch in spring 2012, the project is in its advanced implementation phase. In parallel, preparations for the scientific data processing are well under way within the Gaia Data Processing and Analysis Consortium. Final mission results are expected around 2021, but early releases of preliminary data are expected. This review summarizes the main science goals and overall organisation of the project, the measurement principle and core astrometric solution, and provide an updated overview of the expected astrometric performance.

Keywords

methods: data analysisspace vehicles: instrumentscatalogssurveysastrometryreference systemsstars: distancesstars: kinematics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S261: Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis , April 2009 , pp. 296 - 305
Copyright
Copyright © International Astronomical Union 2010

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