EDP Sciences
Free access
Volume 413, Number 2, January II 2004
Page(s) 771 - 777
Section The solar system
DOI http://dx.doi.org/10.1051/0004-6361:20031524

A&A 413, 771-777 (2004)
DOI: 10.1051/0004-6361:20031524

Formalism and quality of a proper motion link with extragalactic objects for astrometric satellite missions

M. Metz and M. Geffert

Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
(Received 26 May 2003 / Accepted 25 September 2003 )

The accuracy of the link of the proper motion system of astrometric satellite missions like AMEX and GAIA is discussed. Monte-Carlo methods were used to simulate catalogues of positions and proper motions of quasars and galaxies to test the link. The main conclusion is, that future satellite missions like GAIA may be "self-calibrated" by their measurements of QSOs, while additional measurements from radio stars or HST-data are needed to calibrate the less deep reaching astrometric satellite missions of AMEX type.

Key words: astrometry -- reference systems -- quasars

Offprint request: M. Metz, mmetz@astro.uni-bonn.de

SIMBAD Objects in preparation

© ESO 2004