HUBBLE SPACE TELESCOPE
                               DAILY REPORT #839

PERIOD COVERED:  0800 EST
Daily Status Report as of 068/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Uplinked Updated Ephemeris Tables, Per MOSES 2871

   1.2 Completed HSP/POL 3557 (Polarimetric Observations of Crab Pulsar in the 
       UV)

       The High Speed Photometer was used to make four polarimetric
       observations of the Crab nebula pulsar. The first two observations
       were executed and left the target well centered. However, the third
       observation failed when the SSAR did not get scheduled (i.e. to
       handle the 1 Meg. data rate). Nothing had been done to compensate
       for the rejected SSAR, so the CU/SDF output was locked up. Many
       NSSC-I status buffer error messages were generated. Because of the
       SDF lockout, the fourth observation failed. (See Operations Note
       2.4) 

   1.3 Completed WFC 1306 (GTO Low Latitude Parallel Program)

       The Wide Field Camera was used to attempt to make four low latitude
       observations taken in parallel with the prime science observations.
       The observations were lost due to problems with the Science Data
       formatter (SDF) which occurred with the prime science observations.
       ( See Notes 1.2 and Operations Note 2.4). 

   1.4 Completed S/C/FOS/BL/RD 4098 (FOS Discriminator Test)

       The Faint Object spectrograph was used to conduct a discriminator
       test. An internal flat observation was made with the FOS high
       voltage set at half value and with the overlight protection
       disabled. The results of the test were reported to look normal. 

   1.5 Completed PC 4106 (HST Medium Deep Survey)

       The Planetary Camera was used to make one medium-Deep sky survey
       observation which was taken in parallel with the prime science
       observation. This was to provide for serendipitous discoveries, and
       to help build a basic sky survey. The observations was reported to
       look fine. 

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 1
                                        Successful : 1
                          Scheduled Reacquisitions : 2
                                        Successful : 2
                                    Losses of Lock : 0

   2.2 FHST Updates: 

                              Scheduled : 3
                             Successful : 3

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       While the High Speed Photometer was being used to make polarimetric
       observations of the Crab nebula pulsar the Science Data Formatter
       (SDF) unit locked up. The SDF locked up because proper handshaking 
       between the NSSC-I and the SDF had not been set up when several
       requests for high rate real time transfer from the HSP could not be
       supplied. The HSP was disabled to enable other SI observations to
       continue. Shortly afterwards, due to concerns over the vulnerability
       of the HSP to bright objects, the HSP was safed. The command plan is
       currently being modified to allow the HSP observations to resume as
       soon as is possible. 


3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

   3.1 Uplink Updated Ephemeris Tables, Per MOSES 2871

   3.2 Complete PC 3769 (Structure of Inner Coma of Comet Chiron)

   3.3 Complete WFC/PC 4109 (WF/PC Calibration: Rapid Internal Monitor)

   3.4 Complete HSP/POL 3557 (Polarimetric Observations of Crab Pulsar in 
       the UV)

   3.5 Complete WFC 1306 (GTO Low Latitude Parallel Program)

   3.6 Complete S/C/FOS/BL/RD 4098 (FOS Discriminator Test)

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.