THE ASTRONOMICAL JOURNAL       VOLUME 105, NUMBER 3, PAGE 1196       MARCH 1993

      PHOTOMETRIC CALIBRATION OF THE HST WIDE-FIELD/PLANETARY CAMERA. II.
                GROUND-BASED OBSERVATIONS OF CALIBRATION FIELDS

                                HUGH C. HARRIS

        U.S. Naval Observatory, P.O. Box 1149, Flagstaff, Arizona 86002

             DIEDRE A. HUNTER, WILLIAM A. BAUM, AND JOSEPH H. JONES

    Lowell Observatory, Mars Hill Road 1400 West, Flagstaff, Arizona 86001


                                   ABSTRACT

    Ground-based CCD observations have been made simulating the photometric
    properties of the Wide-Field/Planetary Camera (WF/PC) of the Hubble
    Space Telescope.  This paper gives results in 15 of the most important
    WF/PC passbands for two fields chosen to provide efficient in-flight
    calibration of the WF/PC.  These calibration fields are located in the
    outskirts of the globular clusters Omega Cen and NGC 6752.