HUBBLE SPACE TELESCOPE
                               DAILY REPORT #853

PERIOD COVERED:  0800 EST
Daily Status Report as of 088/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

    All of the scientific observational proposals which were scheduled
    during this period were not initiated due to the current Safe Mode
    event. An intercept back into the SMS will be initiated as soon as is
    possible. 

2.0 FLIGHT OPERATIONS SUMMARY:

    There was no FGS or FHST activity due to the Safe Mode event.

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 0
                                        Successful : 0
                          Scheduled Reacquisitions : 0
                                        Successful : 0
                                    Losses of Lock : 0

   2.2 FHST Updates: 

                              Scheduled : 0
                             Successful : 0

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       The HST entered Software Sunpoint Safemode on Wednesday , March 24,
       1993 at 1646Z. The preliminary indications for this event are that
       the Solar Arrays (SAs) electronics sensed an erroneous position to
       the onboard computer. HST operations continue with the vehicle in
       software sunpoint safemode, SADE 1 was powered on Saturday, March
       27, 1993. The SA angles seen from SADE 1 were incorrect and did not
       match those put out by SADE 2. An eight degree SA slew was commanded
       under SADE 2 control. The angles seen from SADE 1 did not change.
       SADE 1 is therefore not usable at this time. An anomaly
       investigation team composed of NASA, ESA, and contractor personnel
       has been formed. The team is analyzing the results of the test
       conducted last Saturday. Further tests with SADE 1 are being
       considered in order to isolate the problem. 

       The current plan is to resume science operations at 091/000Z. To
       ensure that the HST will be safe in event of a failure of SADE 2,
       the SAs will remain fixed at 90 degrees (normal to the sun at +V3 to
       sun attitude). This week's SMS is being replanned to restrict the
       vehicle attitude to within 25 degrees of the SA normal. A team
       composed of NASA, ESA, STScI, and contractor personnel is developing
       options to relax this current restriction. Recommendations and plans
       for future operations will be developed in the near-term. 

       Based on the current best estimates the short term plans for 
       continuing the science operations are that: 
 
       * Recovery of the spacecraft to Normal Mode on Monday, March 29,
         1993 at 1900Z.

       * Start the Health and safety load at 090/0000Z.

       * Begin SMS 091 execution at 091/0000Z 

       * The solar angle will be limited between 65 and 115 degrees (i.e.,
         90 + or _ 15 degrees). 

3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

    All of the the scientific observational proposals which normally would
    be scheduled during this period will not be initiated due to the current
    Safe Mode event. An intercept back into the SMS will be initiated as
    soon as is possible. 

4.0 ANOMALY STATUS:
	
   4.1 Significant New Anomalies: None

   4.2 Significant Unresolved Anomalies: None
 
5.0 SIGNIFICANT FORTHCOMING EVENTS: Nothing at this time.

                             -END-