The Tycho Reference Catalogue is one of the main outcomes of the Hipparcos mission and the present authors want to express their gratitude to the Hipparcos Science Team for access to the Hipparcos and Tycho results in advance of publication and their appreciation of the efforts of the many individuals and organisations participating in the Hipparcos and Tycho projects over many years. This work was supported by the Danish Space Board and the Velux Foundation of 1981, by the Russian Foundation for Basic Research, by the Swedish National Space Board and by the Deutsche Forschungsgemeinschaft. We finally wish to thank an anonymous referee for constructive comments on an earlier version of this paper.
© European Southern Observatory (ESO) 1998
Online publication: June 26, 1998