Issue |
Astron. Astrophys. Suppl. Ser.
Volume 126, Number 1, November II 1997
|
|
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Page(s) | 31 - 37 | |
DOI | https://doi.org/10.1051/aas:1997106 | |
Published online | 15 November 1997 |
The Potsdam contribution to the extragalactic link of the Hipparcos proper motion system
WIP Astronomie, Universität Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Send offprint request to: S. Hirte
Received:
13
January
1997
Accepted:
17
February
1997
Absolute proper motions of 360 Hipparcos stars in 24 fields well distributed
over the northern sky were derived from measurements of photographic plates
taken mainly with the Tautenburg Schmidt telescope (134/200/400 cm). In each
field (about 10 square degrees) a large number of galaxies was used to link
the proper motions to the extragalactic reference system. Because of systematic
magnitude-dependent errors, which affect the proper motion determination of
bright stars, only the 256 stars with were used to determine the
spin parameters of the Hipparcos system. The accuracy of the final result is
0.5 mas/yr for all three spin parameters.
Key words: astrometry / methods: statistical / reference systems / catalogs / stars: kinematics
© European Southern Observatory (ESO), 1997