HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2103

PERIOD COVERED:  0000Z (UTC) 04/15/98 - 0000Z (UTC) 04/16/98

Daily Status Report as of 106/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of STIS/CCD 7355 (Continuous Ultraviolet
Monitoring of NGC 3516)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
continuous ultraviolet observations of galaxy NGC-3516.  Recent intensive
IUE monitoring of NGC-3516 and other AGN reveal rapid aperiodic variations
down to the shortest time scales yet probed {~80 min}, strongly correlated
throughout the UV and X-ray with no detectable interband lag.  A wavelength
calibration image was also taken.  The observations were completed as
planned, and no anomalies were reported.

   1.2 Completed WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  This dark calibration program obtains three dark frames
every day to provide data for monitoring and characterizing the evolution
of hot pixels.  The observations were executed as scheduled, and no
anomalies were noted.

   1.3 Completed STIS/CCD 7908 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  The observations were completed as
planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 4
                                        Successful : 4

                          Scheduled Reacquisitions : 5
                                        Successful : 3

       The re-acquisition at 106/0200Z failed after five periods of loss of
lock.  (This, and the subsequent failure, used the same guide star pair.)
HSTAR 6437 was written.  Later, HSTAR 6438 described another re-acquisition
failure at 106/0331Z that occurred since the roll error was high due to the
previous failure.  After the last failure, an ARU/PRT was uplinked at
106/0514Z.  The following re-acquisition succeeded with difficulty.  Each
of the failures affected the iteration of proposal 7355 that will be
covered by tomorrow's report.

   2.2 FHST Updates:

                              Scheduled : 2
                             Successful : 2

   2.3 Operations Notes:

       The correctable SSR EDAC counts were cleared three times using ROP SR-1.

       ROP NS-5 was used to clear the engineering data report.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH