This work was supported by the Velux Foundation of 1981 and the Danish Space Board.
We are grateful to Dr. S. Röser, Astronomisches Rechen-Institut in Heidelberg for permission to use the STARNET catalogue as part of the Tycho-2 Input Catalogue, and to Dr. B. McLean, Space Telescope Science Institute in Baltimore for making the GSC 1.2 available to us for the same purpose. We wish to thank Dr. D. Egret of the Strasbourg Astronomical Observatory and the Guide Star Catalog team of the Space Telescope Science Institute for assistance in supplying additional GSC running numbers for the Tycho-2 stars.
We thank an anonymous referee for constructive advice.
© European Southern Observatory (ESO) 2000
Online publication: March 9, 2000