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Characterizing the Astrometric Errors in the Gaia Catalogue

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
B. Holl ,
L. Lindegren  and
D. Hobbs
B. Holl
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden. e-mail: [email protected]; [email protected]; [email protected]
L. Lindegren
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden. e-mail: [email protected]; [email protected]; [email protected]
D. Hobbs
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden. e-mail: [email protected]; [email protected]; [email protected]
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Abstract

Accurate characterization of the errors in the global astrometric solution for Gaia isessential for making optimal use of the catalogue data. We investigate the structure ofthe covariance between the estimated astrometric parameters by studying the properties ofthe astrometric least squares solution. We find that astrometric errors can be separatedin a star and an attitude part, due to the estimation of the star and attitude parametersrespectively. Hence the covariances can be separated in a star, an attitude and a crossterm. This is demonstrated using our scalable simulation tool AGISLab, where thecovariances are estimated statistically using Monte Carlo techniques.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 117 - 122
Copyright
© EAS, EDP Sciences 2011

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References

Références

Bombrun, A., Lindegren, L., Holl, B., & Jordan, S., 2010, A&A, 516, A77
ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200
Holl, B., Hobbs, D., & Lindegren, L., 2010a, ed. S.A. Klioner, P.K. Seidelmann, & M.H. Soffel, IAU Symposium, 261, 320
Holl, B., Lindegren, L., & Hobbs, D., 2010b, A&A, in preparation
Lindegren, L., O’Mullane, W., Hobbs, D., & Lammers, U., 2010, A&A, in preparation