| Author(s): | Wielen, R. |
| Title: | A Method for Determining the Individual Accuracy of Astrometric Catalogues |
| Source: | Astron. Astrophys. 302, 613 |
| Year: | 1995 |
| Abstract: | We present a method for determining empirically the actual accuracy (external errors) of proper motions and positions given in astrometric catalogues. The method is based on a comparison of a sufficient number of independent proper motions and positions. The method can be applied, for example, to a comparison of the basic FK5 and the future Hipparcos catalogue with the aim to determine the external errors of the proper motions in both catalogues separately. A few variations of the same basic method are presented: The tmin method, the mu0 method, and the K method. The expected statistical uncertainty of the derived external errors is discussed, especially as a function of the number of stars used. Numerically simulated catalogues confirm the validity of the results produced by the proposed method. The most disturbing effect may be undetected astrometric binaries. |
| Preprint issued: | December 1994 |
| Remarks: |
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