Implementation of the Global Parameters Determination in Gaia's Astrometric Solution (AGIS)
Raison, F.; Olias, A.; Hobbs, David; Lindegren, Lennart (2010). Implementation of the Global Parameters Determination in Gaia's Astrometric Solution (AGIS). Mizumoto, Yoshihiko; Morita, Koh-Ichiro; Ohishi, Masatoshi (Eds.). Astronomical Society of the Pacific Conference Series, 434,, 386 - 389. Astronomical Data Analysis Software and Systems XIX. Sapporo, Japan: Astronomical Society of the Pacific (ASP)
Conference Proceeding/Paper
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Published
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English
Authors:
Raison, F.
;
Olias, A.
;
Hobbs, David
;
Lindegren, Lennart
Editors:
Mizumoto, Yoshihiko
;
Morita, Koh-Ichiro
;
Ohishi, Masatoshi
Department:
Lund Observatory - Has been reorganised
Abstract:
Gaia is ESA’s space astrometry mission with a foreseen launch date in early 2012. Its main objective is to perform a stellar census of the 1000 Million brightest objects in our galaxy (completeness to V=20 mag) from which an astrometric catalog of micro-arcsec level accuracy will be constructed. A key element in this endeavor is the Astrometric Global Iterative Solution (AGIS). A core part of AGIS is to determine the accurate spacecraft attitude, geometric instrument calibration and astrometric model parameters for a well-behaved subset of all the objects (the ‘primary stars’). In addition, a small number of global parameters will be estimated, one of these being PPN γ. We present here the implementation of the algorithms dedicated to the determination of the global parameters.
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