Beschreibung:
<jats:title>Abstract</jats:title><jats:p>The Tycho Catalogue contains basic astrometric and photometric data for a million stars on the sky, complete to about <jats:italic>V</jats:italic> = 10.5 mag. The accuracy at the catalogue epoch (J1991.25) of positions and two-colour magnitudes is generally an order of magnitude better than has hitherto been available for the majority of these stars. Results from the production and verification of the catalogue is presented. The catalogue and associated epoch photometry annex are available in machine-readable form as part of the final Hipparcos mission products.</jats:p>