HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1853

PERIOD COVERED:  0000Z (UTC) 04/09/97 - 0000Z (UTC) 04/10/97

Daily Status Report as of 100/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed NIC/1/2/3 7034 (NICMOS Field Offset Mechanism Test)

       The NICMOS Near Infrared Cameras (Cameras 1, 2 and 3) were used to =
conduct a field offset mechanism test by making observations of P330E.  A =
25-point spiral dither pattern is used to generated a 5 x 5 grid of point =
source and thermal background observations in each camera.  The tests =
were conducted as scheduled, and no anomalies were reported. 

   1.2 Completed WF/PC-2 6731 (Exploring PN Production as a Probe of =
Elliptical Galaxy Stellar Populations)

       The WF/PC-2 was used to make observations of the galaxy NGC-3379 =
in order to explore planetary nebulae production as a function of =
elliptical galaxy stellar population.  In addition to being an excellent =
distance indicator, the O III Lambda 5007 A0 planetary nebula luminosity =
function is potentially a powerful probe of stellar population within =
these galaxies.  The observations were executed as scheduled, and no =
anomalies were noted. 

*************************************
          Zero gyro safemode occurred at approximately 
          099/171712Z.  See details in Section 2.3.
**************************************

The following observations could not be executed due to the safemode =
event:

   1.3 WF/PC-2 6837 (The Ultraviolet Properties of 
       "Dwarf" Seyfert 1 Nuclei)
   1.4 STIS/CCD 7092 (CCD Dark Rate and Read Noise)
   1.5 WF/PC-2 6632 (Morphologies of High 
       Redshifted Radio Galaxies)
   1.6 NIC 1/2/3 7049 (NICMOS Absolute Photometry Test)

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 9
                                        Successful : 0

                          Scheduled Reacquisitions : 8
                                        Successful : 4

       All acquisition and re-acquisition "failures" were due to the =
safemode entry.

   2.2 FHST Updates: 

                              Scheduled : 19
                             Successful : 0

       No scheduled updates were performed due to the safemode entry.

   2.3 Operations Notes: 

       The battery 6 capacity test was completed at 099/1907Z.

       During a Type 2 vehicle slew, zero gyro safemode was entered at =
approximately 099/171712Z.  Telemetry (at 099/155232Z) prior to the slew =
indicated that the gyro 4 motor current dropped from 160 mA to 0 mA.  =
Then, during the slew, anomalous gyro 4 rate output caused gyro disparity =
count violations in gyros 3, 5, and 6 which resulted in the safemode =
entry.

       The PSEA was patched for three gyro operations at 099/1921Z, =
safemode recovery SPC load was patched for the same reason at 100/0333Z, =
and the HST was recovered to software sunpoint at 100/0507Z.

       Gyro 4 was powered off at 099/2123Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       After a meeting this morning at 8:30L, plans are to go to inertial =
hold.  Approximately 10-12 hours after this is accomplished, the health =
and safety load should commence, and after another 12 hours the intercept =
science and SMOV SMS should start.  The specifics of these plans are not =
currently known.

       Resumption of normal science and SMOV operations is therefor =
expected sometime tomorrow.

/DMH