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Lennart Lindegren. Profile picture.

Lennart Lindegren

Professor

Lennart Lindegren. Profile picture.

Characterizing the Astrometric Errors in the Gaia Catalogue

Author

  • Berry Holl
  • Lennart Lindegren
  • David Hobbs

Summary, in English

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.

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2011

Language

English

Pages

117-122

Publication/Series

EAS Publications Series

Volume

45

Issue

GAIA: At the Frontiers of Astrometry

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1633-4760