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An updated GSC as the astrometric reference for minor planet observations

Published online by Cambridge University Press:  25 May 2016

Siegfried Röser
Siegfried Röser*
Affiliation:
Astronomisches Rechen-Institut Mönchhofstr. 12-14, 69120 Heidelberg, Germany

Abstract

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Minor planet observers generally use the Guide Star Catalog (GSC) as the astrometric reference for the reductions of their CCD frames. Two problems are related with GSC. First, it contains no proper motions, and second, it shows severe systematic errors near the plate edges.

I report on the status of a new reduction of GSC and present a first version of STARNET, a catalogue of 4.3 million positions and proper motions using GSC as second, and a new reduction of the Astrographic Catalogue (AC) as first epoch. In STARNET the average rms-accuracy of the proper motions is 5 milliarcsec/year, that of the present-day positions 0.3″.

Type
Part XI - Reference Frames. Stellar Astrometry
Information
Symposium - International Astronomical Union , Volume 172: Dynamics, Ephemerides and Astrometry of the Solar System , 1996 , pp. 481 - 482
Copyright
Copyright © Kluwer 1996 

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