HUBBLE SPACE TELESCOPE
                               DAILY REPORT #901

PERIOD COVERED:  0800 EST
Daily Status Report as of 155/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

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

       The Faint Object Camera (f/96) was used to make one ultraviolet
       snapshot image of nearby galaxy ESO-2254-4. The exposure lasted ten
       minutes, and used filter F220W. The observations was reported to be
       a satisfactory exposure. 

   1.2 Completed FOC/96 3801 (Search for QSOs Suitable for Subsequent 
       Observations of He II)

       The Faint Object Camera (f/96) was used to make two ultraviolet
       images of quasars 1327+113 and 1340+099 to find out if the objects
       have sufficient ultraviolet flux for subsequent observations using
       the Faint Object Spectrograph and the High Resolution spectrograph.
       Both images were received and displayed. No anomalies were noted. 

   1.3 Completed HSP/UV1 1091 (Ultraviolet Pulsations from X-Ray Pulsars)

       The High Speed Photometer was used to make single color observations
       in the ultraviolet of the X-Ray pulsating binary star GX304-1
       looking for an optical counterpart. Three sets of observations were
       received. The two target acquisition images showed no target, with
       only a few counts in several scattered pixels. The following
       science observations had a maximum of only two counts. 

   1.4 Completed FOS/BL 4203 (Spatially Resolved Spectroscopy of Jupiter 
       - Cycle 2)

       The Faint Object Spectrograph was used to make spectroscopic
       observations of the Great Red Spot and North Pole regions on the
       planet Jupiter. This is to look for emissions from 1700 A0 to 2300
       A0, and to investigate the chemical composition of the upper
       atmosphere in these regions. One observation was received and
       displayed for the principal investigator. The other observations
       occurred during LOS, and will be investigated later. 

   1.5 Completed PC 3698 (A Snapshot Survey of the Nuclear Regions of 102 
       Markarian Galaxies)

       The Planetary Camera was used with filter F785LP to make
       observations of the Markarian galaxy UGC-1186-1 to study the
       morphology and nuclear luminosity function of this galaxy. The
       observations were executed as scheduled, and no problems were
       reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 7
                                        Successful : 7
                          Scheduled Reacquisitions : 3
                                        Successful : 3
                                    Losses of Lock : 0

   2.2 FHST Updates: 

                              Scheduled : 17
                             Successful : 17

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       OTA Breathing Test
       ------------------
 
       The Breathing Test was executed on the spacecraft on May 25-26.  FGS
       2 was reactivated for this test since all three FGSs were required.
       Repeated astrometry observations were made using a small set of
       stars to investigate scale changes ("breathing") in the spacecraft
       structure.  The flight software was patched to limit the FGS star
       selector servo rate to 5141 arc sec/sec. Preliminary indicators are
       that the test proceeded as planned.  There were sessions of two data
       takes each. Each session included guide star acquisitions using fine
       lock, followed by parallel data takes involving FGS #2 as the
       astrometry FGS, and images from the FOC and WF/PC.  Data analysis is
       now under way. 

       Magnetic Sensing System
       -----------------------

       The spacecraft experienced a period of MSS #1 V2 Channel saturation
       on Sunday. The saturation lasted almost 3 hours and cleared after a
       spacecraft slew. There was no impact to ongoing operations or the
       science program.  The anomaly is under investigation. 

3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

   3.1 Uplink Updated Ephemeris Tables, Per MOSES 2871

   3.2 Complete FOS/BL 3616 (The Upper Atmosphere of Uranus and Neptune)

   3.3 Complete WFC/PC 4109 (WF/PC Cycle 2 Calibration: Rapid Internal 
       Monitor)

   3.4 Complete Three Sets of FOC/96 4804 (UV Imaging of Nearby Galaxies 
       with FOC/96)

   3.5 Complete WFC 4277 (Calibration of Nearby Galaxies Type IA Supernova 
       as Standard Candles)

   3.6 Complete FOS/RD 3887 (Integrated Dynamical and Spectroscopic 
       Observations of Jupiter)

   3.7 Complete WFC/PC 4207 (WF/PC Cycle Calibration: Photometric 
       Calibration Monitor)

   3.8 Complete HSP/VIS  4569 (A Search for Microflaring Activity in Dwarf 
       M Class Stars - Cycle 3)

   3.9 Complete WFC 4381 (HST Medium-Deep Survey  - Cycle 3)

   3.10 Complete WFC 4348 (Long Period Variables of M81: Cycle 3 Medium)

   3.11 Complete PC 3603 (Snapshot of Protoplanetary Nebulae)

4.0 ANOMALY STATUS:
	
   4.1 Significant New Anomalies: None

   4.2 Significant Unresolved Anomalies: None
 
5.0 SIGNIFICANT FORTHCOMING EVENTS: 

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

       An installation of version 9.0 of the DF-224 flight software is
       planned for June 9-10.  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. Final testing of the 9.0 release is under way in the
       VEST and DSTIF. Additional communications requirements are being
       coordinated with the NCC. 

/DMH                        -END-