HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1639

PERIOD COVERED:  0000Z (UTC) 05/21/96 - 0000Z (UTC) 05/22/96

Daily Status Report as of 143/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of WF/PC-2 6363 (The Environments and Host =
Galaxies of BL-Lac Objects)

       The WF/PC-2 was used to make snapshot survey observations of =
BL-Lac objects ZW-187, GB1011+496, and PKS1538+14 in order to study their =
environments and their host galaxies.  The goal is to investigate =
systematic trends in host galaxy type, unusual morphological features, =
nearby companion galaxies, etc.  The observations were executed as =
scheduled, and no anomalies were noted.

   1.2 Completed Two Sets of WF/PC-2 6359 (Core Properties of the Bulges =
of Spiral Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of =
spiral galaxy NGC-3928 in order to study its central bulge.  The aim is =
to investigate the core properties, correlations with global galactic =
properties, and the frequency of occurrence of multiple and/or =
miscentered nuclei.  The observations were completed as scheduled, and no =
anomalies were noted.

   1.3 Completed FOS/RD 6007 (Comparison of Large Scale Structures in QSO =
Absorbers and Galaxies)

       The Faint Object Spectrograph (Red Side) was used to make =
observations of Lyman-Alpha absorber QSO CSO173 to do a comparison study =
of its large scale structure.  This target was selected as a deep, =
redshifted galaxy from a survey which already exists.  The observations =
were executed as scheduled, and no anomalies were noted.

   1.4 Completed Three Sets of WF/PC-2 6609 (The WF/PC-2 B-Band Parallel =
Survey: A Systematic and Synoptic Study )

       The WF/PC-2 was used to make B-Band survey observations in =
parallel with the prime science observations.  A total of 216 exposures =
will be taken over a period of time to make a statistical study of the =
formation and evolution of the galaxies.  The observations were executed =
as scheduled, and no anomalies were noted. 

   1.5 Completed Three Sets of WF/PC-2 6187 (WF/PC-2 Cycle 5 Calibration: =
Earth Flat)

       The WF/PC-2 was used to make Earth streak flat calibration images. =
 These streak flats will be used to produce flat fields, to map the OTA =
illumination pattern and, in combination with other data, to produce new =
superflats.  The observations were completed as planned, and no problems =
were reported.

   1.6 Completed WF/PC-2 6250 (WF/PC-2 Cycle 5 Calibration: Internal =
Monitor)

       The WF/PC-2 was used to make a series of internal calibration =
observations.  Internal flats, biases, and K-Spot calibration images were =
taken.  These observations are designed to monitor the health of the =
cameras.  The observations were executed as scheduled, and no anomalies =
were noted.

   1.7 Completed WF/PC-2 6431 (Determination of the Extragalactric =
Distance Scale)

       The WF/PC-2 was used to make observations of the galaxy NGC-4548 =
to be used in measuring the periods of Cepheid variable stars within this =
galaxy.  This will allow for a more accurate estimate of the distances to =
these galaxies through the period-luminosity relation for the Cepheid =
stars.  The observations were executed as scheduled, and no anomalies =
were noted.

   1.8 Completed FGS 6047 (Calibrating the Mass Luminosity Relation at =
the End of the Main Sequence)

       The FGSs were used to make astrometric observations of star =
GJ1245+496 as part of a study to determine its mass luminosity =
relationship.  The purpose is to measure the precise parallax and =
relative orbit of its faint companion.  The observations were completed =
as planned, and no problems were reported.

   1.9 Completed WF/PC-2 6253 (Pure Parallel Archive Program)

       The WF/PC-2 was used to execute a pure parallel program taking =
ultraviolet observations running concurrently with prime science =
observations.  The intent is to search for extra-galactic sources with =
flux excesses at 3000 A0 and galactic sources with excesses at 1600 A0.  =
The observations were completed as planned, and no problems were =
reported.

   1.10 Completed FOS/RD 6577 (An Expanded Survey for Study of the =
Lyman-Alpha Line and QSO Mg II Absorption)

       The Faint Object Spectrograph (Red Side) was used to make =
observations of the QSO Q0453-423 in order to make a survey of the =
Lyman-Alpha line and the 68 Mg II absorption line system.  The =
observations were completed as scheduled, and no problems were reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 7
                                        Successful : 7

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates: 

                              Scheduled : 14
                             Successful : 14

   2.3 Operations Notes: 

       Over the last three days, HST operations personnel have noticed =
poly errors during many science tape recorder dumps.  Of the seven =
science tape recorder dumps performed today, only the one at 143/0020Z =
had poly errors, but that one contained 18.

       HST operations was scheduled to transfer to the SAMS backup =
facility during the night so that maintenance work could be performed in =
the MOR area.  However, that move has been delayed until a TTAC problem =
at SAMS can be corrected.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

        Nothing at this time.

/DMH