Skip to main content Accessibility help

Characterizing the Astrometric Errors in the Gaia Catalogue

  • C. Turon, F. Meynadier, F. Arenou, B. Holl (a1), L. Lindegren (a1) and D. Hobbs (a1)...


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.



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


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed