HUBBLE SPACE TELESCOPE
                               DAILY REPORT #904

PERIOD COVERED:  0800 EST
Daily Status Report as of 160/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed FOC/96 4353 (Hubble space Telescope: Imaging of Io: Cycle 3 
       High)

       The Faint Object Camera was used to make one ultraviolet observation
       of Jupiter's moon Io in order to determine the abundance and
       distribution of surface and atmospheric constituents, particularly
       sulfur dioxide. The first observations was a dark calibration
       exposure taken off target to check out the camera. The OSS then sent
       a corrective maneuver to the spacecraft to move the aperture to
       the target and to verify the filters. The image of the target was
       displayed in the OSS, and was reported to look normal. 

   1.2 Completed Three Sets of WFC 4713 (WF/PC Cycle Two Calibration: 
       Internal Delta Flats)

       A total of seven internal flat calibration images were made using
       the Wide Field Camera. These images will be used for the restoration
       of Earth flats, which were altered due to changes in quantum
       efficiency which occurred after WFPC decontamination operations. All
       seven observations were monitored in the OSS. All were reported to
       be normal. 

   1.3 Completed FOS/RD 4772 (Black Holes, Stellar Dynamics and Populations 
       in Nuclei)

       The Faint Object Spectrograph was used to study the central core
       nucleus region of elliptical galaxy NGC-4473 to study its stellar
       population and dynamics of its core. The peakups appeared to be
       successful. However, the conformation image was reviewed and
       appeared to be blank. 

   1.4 Completed WFC 4381 (HST Medium-Deep Survey - Cycle 3)

       The Wide Field Camera was used to make one medium-deep high latitude
       sky survey image taken in parallel with the prime science
       observation. The observation was monitored and displayed. It was
       reported to be normal. 

   1.5 Completed WFC/PC 4109 (WF/PC Cycle 2 Calibration: Rapid Internal 
       Monitor)

       Both the Wide Field Camera and the Planetary Camera were used to
       make on internal flat observation each. These observations were to
       check for new forms of contamination (i.e., daisies and measles),
       and the possible return of quantum efficiency hysteresis which
       occurs after decontamination operations. Both images were received
       and displayed in the OSS. They were reported to be normal. 

   1.6 Completed PC 4140 (WF/PC Cycle 2 Calibration: Rapid Internal Monitor 
       - Part 2)

       The Planetary Camera was used to make two two rapid internal monitor
       observations (internal flats) to check for contamination. Both
       observations occurred during LOS. They were later displayed and
       reviewed. The OSS reported that they were normal. 

   1.7 Completed WFC 4929 (WF/PC Cycle 2 : Improved Dark Calibration)

       The Wide Field Camera was used to make a dark calibrations image.
       The Observation lasted 1200 seconds, and the camera was pre-flashed.
       The observations were executed as scheduled, and no problems were
       reported. 
  
   1.8 Uplinked Updated Ephemeris Tables, Per MOSES 2871

   1.9 Completed FOC/96 3804 (Imaging of UV Bright Stars In Metal Rich 
       Globular Clusters)

       The Faint Object Camera (f/96) was used to make far-ultrviolet
       observations of metal-rich stars in the globular cluster NGC-5921 to
       determine their temperatures and luminosity. The observations were
       monitored by the OSS, and the data quality was assessed. No problems
       were reported. 

   1.10 Completed PC 4902 (HST Medium-Deep Survey - Part 2: Low-Lat - Cycle 
       3 High)

       The Planetary Camera was used to make some low latitude medium-deep
       sky survey images taken in parallel with the prime science
       observations. The observations were executed as scheduled, and no
       problems were reported. 

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

       The Faint Object Camera (f/96) was used to make ultraviolet snapshot
       images of nearby galaxy ESO-1335-1 looking for a possible active
       galactic nucleus (aka, AGN). The exposure lasted ten minutes and
       used filter F220W. No problems were reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 3
                                        Successful : 3
                          Scheduled Reacquisitions : 5
                                        Successful : 5
                                    Losses of Lock : 0

   2.2 FHST Updates: 

                              Scheduled : 11
                             Successful : 11

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       Flight Software
       ---------------

       An installation of version 9.0 of the DF-224 flight software was
       initiated as planned this morning (June 9, 160/1200Z). This will be
       the first time a complete new DF-224 version has been installed on
       the spacecraft since launch.  A successful pre-Flight Readiness
       Review for this installation was held this week. No problems have
       been reported. If all goes as planned the SMS-161 will be initiated
       at 161/0800Z. 

3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

   3.1 Complete S/C 4974 (The Installation of Flight Software 9.0)

   3.2 Complete S/C VSAFE (Safemode recovery of the HST Science Instruments
       - HSP ) 

   3.3 Complete S/C XSAFE (Safemode recovery of the HST Science Instruments
       - FOC ) 

   3.4 Complete S/C YSAFE (Safemode recovery of the HST Science Instruments
       - FOS ) 

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.

/DMH                        -END-