Abstract
The astrometric data bank Arigfh will contain all relevant astrometric data on stellar positions and proper motions of stars from groundbased observations and space missions. For each star in the Arigfh, the best available position and proper motion shall be derived. We rediscuss the accuracy of proper motions and positions of fundamental stars, resulting from a combination of data in the FK5 with the expected results from a revised Hipparcos mission. The FK5 data could be significantly improved even by rather degraded positions from a revised Hipparcos mission.
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