Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402...53h&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 53-56
Physics
Scientific paper
The Potsdam group was involved in the link of the Hipparcos proper motion system to an extragalactic reference system. Absolute proper motions were derived from measurements of photographic plates taken mainly with the Tautenburg Schmidt telescope (134/200/400 cm). In 24 fields included in different Potsdam proper motion programmes and well distributed over the northern sky, 360 Hipparcos stars were measured. In each field of about 10 square degrees a large number of galaxies was used for the link. Detailed investigations showed that the proper motion determination of bright stars is affected by systematic magnitude dependent errors. Therefore, only the 256 stars with B >= 9.0 were used to determine the spin parameters of the Hipparcos system. The accuracy of our final results is 0.5 mas/yr for all three spin parameters. The results are in good agreement with the VLBI link parameters and the synthesized solution by Kovalevsky et al. (1997).
Hirte S.
Schilbach Elena
Scholz Ralf-Dieter
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