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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: berry@astro.lu.se; lennart@astro.lu.se; david@astro.lu.se
L. Lindegren
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden. e-mail: berry@astro.lu.se; lennart@astro.lu.se; david@astro.lu.se
D. Hobbs
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden. e-mail: berry@astro.lu.se; lennart@astro.lu.se; david@astro.lu.se
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Abstract

Accurate characterization of the errors in the global astrometric solution for Gaia is essential for making optimal use of the catalogue data. We investigate the structure of the covariance between the estimated astrometric parameters by studying the properties of the astrometric least squares solution. We find that astrometric errors can be separated in a star and an attitude part, due to the estimation of the star and attitude parameters respectively. Hence the covariances can be separated in a star, an attitude and a cross term. This is demonstrated using our scalable simulation tool AGISLab, where the covariances 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