HUBBLE SPACE TELESCOPE
                       DAILY REPORT #1921

PERIOD COVERED:  0000Z (UTC) 07/16/97 - 0000Z (UTC) 07/17/97

Daily Status Report as of 198/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7659 (Daily Darks to Update Acquisition Bad Pixel
Table)

       The Space Telescope Imaging Spectrograph was used to make dark
calibration images in order to update the acquisition bad pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were executed as scheduled, and no anomalies were noted.

   1.2 Completed Three Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This set of dark calibrations is intended to obtain 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/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements.  These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage.  The observations were completed as
scheduled with no problems.

   1.4 Completed Two Sets of STIS/CCD/MA2 7087 (OTA-STIS Pointing and
Throughput Stability)

       The Space Telescope Imaging Spectrograph (Both CCD and MA2) were
used to make observations of stars HD192273 and HD177989 in order to
calibrate the OTA-STIS pointing and throughput stability.  This is to
evaluate the image motion at both slit and detector planes in a thermally
stable case and through a relatively severe thermal slew on both second
(jitter) and hour (drift) time scales.  The observations were executed as
scheduled, and no anomalies were noted.

   1.5 Completed WF/PC-2 6253 (Pure Parallel Archive Program)

       The WF/PC-2 was used to execute a pure parallel program taking
ultraviolet observations running concurrently with prime science
observations.  The intent is to search for extra-galactic sources with flux
excesses at 3000 A0 and galactic sources with excesses at 1600 A0.  The
observations were completed as planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 2
                                        Successful : 2
                          Scheduled Reacquisitions : 13
                                        Successful : 13

   2.2 FHST Updates:

                              Scheduled : 4
                             Successful : 4

   2.3 Operations Notes:

       The NSSC-1 load uplinked first at 197/184907Z experienced several
problems.  On the first attempt an EXEC 101 error and a count failure
occurred.  The re-transmission saw a count failure and a CU/SDF parity
error.  After the parity error was reset by ground command, the load was
successfully uplinked.  HSTAR 6124 was written.

       The SSR Interrupt Log was dumped at 197/2242Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science and SMOV operations.
/DMH