Celestia 2000 : data from the European Space Agency's Hipparcos space astrometry mission (operated in orbit 1989-1993), including The Hipparcos and Tycho Catalogues, The Hipparcos Double and Multiple Systems annex, The Hipparcos Variability annex, and complementary ground-based data from The updated Hipparcos Input Catalogue and its Double and Multiple Stars annex
CD-ROM Engelsk 1998