THE GUIDE STAR CATALOG                                                               VERSION 1.2beta                                                                                                                                                                                                                        An all-sky astrometric and photometric catalog to support the operation of the Hubble Space Telescope Copyright (c)  1989-1998, The Association of Universities for Research in Astronomy, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             This set of two CD-ROMs in the ISO 9660 format contains the  Guide  Star        Catalog - Version 1.2beta, with an issue date of 17 April 1998.                                                                                                     The Guide Star Catalog (GSC) was prepared by the Space Telescope Science        Institute (ST ScI),  3700 San Martin Drive,  Baltimore,  MD 21218,  USA.        ST ScI is operated by the Association of Universities  for  Research  in        Astronomy, Inc. (AURA), under contract with the National Aeronautics and        Space Administration (NASA).