CHARACTERIZING THE ASTROMETRIC ERRORS IN THE GAIA CATALOGUE

被引：2
|
作者：
Holl, B. [1 ]
Lindegren, L. [1 ]
Hobbs, D. [1 ]
机构：
[1] Lund Univ, Lund Observ, S-22100 Lund, Sweden
来源：
GAIA: AT THE FRONTIERS OF ASTROMETRY | 2011年 / 45卷
关键词：
D O I：
10.1051/eas/1045020
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：117 / 122
页数：6
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