HUBBLE SPACE TELESCOPE
                               DAILY REPORT #845

PERIOD COVERED:  0800 EST
Daily Status Report as of 076/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed FOS/BL 3791 (Quasar Absorption Line Survey)

       The Faint Object Spectrograph was used to make five observations of
       quasar PG1216+069 to find out if this is an appropriate target for
       future observations. The observations were executed in course track.
       There was a reasonable amount of signal in the first four
       observations. However, the peakup did not straddle the target, so it
       was not cretin that the target was well position in the slit. The
       last observations received a number of communication data hits. The
       spectrum looked good, though it is not certain that the target was
       well centered in the aperture. 

   1.2 Completed WFC 4713 (WF/PC Calibration: WFC Internal Delta Flats)

       The Wide Field Camera was used to make internal flats observations.
       These observations will be used for the restoration of Earth flats,
       which were altered due to changes in quantum efficiency which
       occurred after WFPC decontamination operations. The observations
       were reported to look okay. Some of the telemetry communications
       were reported to be garbled. 

   1.3 Completed PC 4714 (WF/PC Calibration: PC Internal Delta Flats)

       The Planetary Camera was used to make seven internal flat
       observations. All seven of the observations were received and
       displayed in the OSS. The observations was reported to look okay.
       However, some of the data segments had been garbled in transmission. 

   1.4 Completed WFC/PC 4109 (WF/PC Calibration: Rapid Internal Monitor)

       Both the Wide Field Camera and the Planetary Camera were used to
       make internal flat calibration images which will be used to look for
       the return of quantum efficiency hysteresis and new forms of
       contamination (i.e., measles and daisies). Both sets of internal
       flat observations were reported to look normal. 

   1.5 Completed PC 4347 (WF/PC Calibration: Flood Retention Test)

       The Planetary Camera was used with filter F439W to take three Earth
       flat calibration images. One of the flats was reported to be
       underexposed, and the other two were saturated. 

   1.6 Completed GHRS/2 1168 (Interstellar Carbon and Oxygen)

       The High Resolution Spectrograph was used to attempt observations of
       standard star HD37043 to obtain high signal to noise ratio data
       which will hopefully show narrow interstellar absorption lines of
       carbon and oxygen. The Baseline guide star acquisition failed. and
       the first onboard target acquisition did not occur (See Operations
       Note 2.4). An attitude reference update was sent to the spacecraft,
       and the peakup target acquisition was successful. It is not certain
       that the star was well centered in the aperture for the spectral
       observations. 

   1.7 Uplinked Updated Ephemeris Tables, Per MOSES 2871

   1.8 Completed PC 4140 (WF/PC Calibration: Rapid Internal Monitor, Part 2)

       The Planetary Camera was used to make internal flat observations
       using filter F349W to look for form of quantum efficiency
       hysteresis. The observations were executed as scheduled and no
       problems were reported. 

   1.9 Completed GHRS/2 3496 (Ultraviolet Atlas of Sirius)

       The High Resolution Spectrograph (WSCAN Mode) was used to obtain
       ultraviolet spectra of the star Sirius (aka, HD48915) to get actuate
       flux distribution and line profiles. The observations were executed
       as scheduled, and no problems were reported. 

   1.10 Completed FOC/96 4804 (UV Imaging of Nearby Galaxies wit FOC/96)

       The Faint Object Camera (f/96) was used to make ultraviolet snapshot
       of the nearby galaxy UGC-1655. The observations were monitored by
       the OSS, and assessed the data quality. No problems were reported. 

   1.11 Initiated WFC 4658 (Determination of Extragalactic Distance Scale)

       Observations have been initiated using the Wide Field Camera to look
       at two different fields within galaxy M-101 (aka, NGC-457) to help
       locate Cepheid variable stars. The observations are currently
       ongoing, and no problems have been reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 3
                                        Successful : 2

                            (CT at 076/0213Z, See Operations Note 2.4)

                          Scheduled Reacquisitions : 10
                                        Successful : 10
                                    Losses of Lock : 0

   2.2 FHST Updates: 

                              Scheduled : 12
                             Successful : 7

                            (Failures at 076/0110, 0114,0128, 0148, and 
                             0151  See Operations Note 2.4)

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       One Guide Star acquisition and five Fixed Head Star Tracker (FHST) 
       updates failed due to attitude error introduced during the HIGH MODE
       DATA TAKE interval. An HSTAR (3929) was written, and the problem is
       being investigated. The subsequent reacquisition was saved by an
       Attitude Reference Update Planned Real-Time Slew (ARU/PRT). 

3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

   3.1 Complete WFC 4658 (Determination of Extragalactic Distance Scale)

   3.2 Complete FOC/96/WFC 3325 (Structure of Globular Clusters)

   3.3 Initiate GHRS/2 3755 (Absorption Cross-section of Nearby Galaxies)

4.0 ANOMALY STATUS:
	
   4.1 Significant New Anomalies: None

   4.2 Significant Unresolved Anomalies: 

       FGS #2 Anomaly Investigation 

       Further testing and analysis of the FGS #2 anomalous behavior are
       still ongoing. In the interim FGS #2 will not be used for
       observations. 
 
5.0 SIGNIFICANT FORTHCOMING EVENTS: Nothing at this time.

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