HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1881

PERIOD COVERED:  0000Z (UTC) 05/19/97 - 0000Z (UTC) 05/20/97

Daily Status Report as of 140/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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-3455 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.

   1.2 Completed Five Sets of STIS/CCD 7092 (CCD Dark Rate and Read Noise)

       Observations were taken to measure CCD dark current and gather data
for making super darks.  The observations were completed as planned, and no
anomalies were reported.

   1.3 Completed WF/PC-2 6862 (Starburst Luminous Blue Galaxies)

       The WF/PC-2 was used to study the starbursting regions in luminous
blue galaxy NGC-2415.  This class of galaxies is common at moderate
redshifts but relatively rare nearby.  The observations were executed as
scheduled, and no anomalies were noted.

   1.4 Completed Four Sets of NIC/2/3 7048 (NICMOS Parallel Thermal
Background Test)

       The Near Infrared Cameras (Cameras Two and Three) were used to make
observations of an object designated as Target-1 in order execute
measurements of the stability of the HST thermal emissions.  The
observations were executed as scheduled, and no problems were reported.

   1.5 Completed NIC/1 7152 (NICMOS Absolute Photometry Test)

       The Near Infrared Camera (Camera One) was used to conduct an
absolute photometric calibration test.  A dark calibration image was also
taken.  The observations were completed as scheduled, and no anomalies were
reported.

   1.6 Completed WF/PC-2 6357 (The Nuclear Morphology of Elliptical Galaxies)

       The WF/PC-2 was used to make images of the early type, large,
elliptical galaxy NGC-3065 (taken form a list of 150 galaxies) in order to
study its nuclear morphology.  This survey will complement Illingworth's
snapshot study of later Hubble types.  The observations were completed as
scheduled, and no anomalies were reported.

   1.7 Completed FOC/96 6834 (Lenses, Mirrors, and HST: IRAS FSC10214+4724
Under a Compound Microscope)

       The Faint Object Camera (f/96) was used to make observations of IRAS
FSC10214+4724.  Our existing WF/PC-2 images using filter F814W provide
compelling evidence that the this object which is at redshift 2.3 is
gravitationally lensed.  The observations were completed as planned, and no
anomalies were reported.

   1.8 Completed Two Sets of WF/PC-2 7553 (Pure Parallel Archive Survey II)

       WF/PC-2 parallel observations were obtained in the ultraviolet in
search for interesting objects.  This program is designed to find
extragalactic sources with near ultraviolet excesses (3000 A0) outside the
galactic plane and far ultraviolet sources (1600 A0) in the galactic plane.
The procedure was executed as scheduled, and no anomalies were reported.

   1.9 Completed Three Sets of WF/PC-2 6610 (WF/PC-2 Lyman-Alpha Imaging of
Galaxy cluster at Z = 2.4)

       The WF/PC-2 was used to make observations of an apparent blank field
of view hoping to make Lyman-Alpha observations of faint galaxies located
at a distance of Z=2.4.  Earlier exposures revealed many compact
Lyman-Alpha emitters at this distance.  These observations were executed in
parallel with the prime science observations.  The observations were
completed as planned, and no problems were reported.

   1.10 Completed WF/PC-2 6905 (WF/PC-2 Cycle 6 Calibration: Internal Monitor)

       The WF/PC-2 was used to make several internal calibrations
observations including biases and internal flats as part of a Cycle 6
calibrations procedure.  A variety of internal exposures are run weekly to
verify and monitor the health of the camera.  The observations were
executed as scheduled, and no anomalies were noted.

   1.11 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section
Only): Cycle 4)

        This proposal was executed as scheduled, and no anomalies were noted.

   1.12 Completed WF/PC-2 6887 (A Photometric Search for Faint Companions
to Nearby Stars)

       The WF/PC-2 was used to make a photometric search observations of
the nearby star ROSS128 in order to look for possible companions.  The
technique involves use of the Planetary Camera with wide band pass filters
to photometrically measure for the presence of resolved dark companions.
The observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed WF/PC-2 6362 (Supernova Host Galaxy)

       The WF/PC-2 was used to make observations of the supernova host
galaxy GAL-084609.  As documented in HSTAR 6071, the guide star acquisition
for this proposal, scheduled for 139/1040Z, failed.  No further anomalies
were noted.

   1.14 Completed S/C 4974 (DF-224 FS Installation 9.0 and Higher)

       The HST was placed in V3 Sun Point Mode for the loading of Flight
Software 9.8.  The operation was completed as scheduled.

   1.15 Completed WF/PC-2 6346 (Snapshot Survey of the Ultraluminous IRAS
Galaxy Sample-Part 1 High)

       The WF/PC-2 was used to make snapshot survey observations of the
ultraluminous IRAS galaxy QDORULIR08.  These data will be searched for
multiple cores, which imply a merger has occurred, and for starburst
regions.  The observations were executed as scheduled, and no anomalies
were noted.

   1.16 Completed WF/PC-2 6906 (WF/PC-2 Cycle 6 Calibration: Internal
Monitor-Visual Flats)

       The WF/PC-2 was used to make internal calibration visual flat images
as part of the Cycle 6 internal monitoring of the instrument's operations.
This proposal defines the standard series of internal flat fields, which
will be executed twice per month.  The observations were completed as
planned, and no anomalies were reported.

   1.17 Completed NIC/2 7040 (NICMOS Plate Scale and Astrometric Calibration)

       The Near Infrared Camera (Camera Two) was used to make observations
of cluster NGC-1850 as part of a plate scale and astrometric calibration.
The observations were executed as scheduled, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 5
                                        Successful : 4
                          Scheduled Reacquisitions : 4
                                        Successful : 4

         As detailed in 1.13, there was one acquisition failure.

   2.2 FHST Updates:

                              Scheduled : 10
                             Successful : 10

   2.3 Operations Notes:

       The installation of DF-224 flight software version 9.8 (which
contained enhancements to the coprocessor operating system and the
implementation of KRSWCC which will allow batteries' charging to higher
cutoff voltages to slow or stop battery capacity degradation) occurred
flawlessly.  The process began at 139/1110Z with the uplink of a HLGBU.
Loading of memory was nominal as was the collection and analysis of one
coprocessor memory dump and two DF-244/shared memory dumps.  The code was
operating as per design, with the KRSWCC operating in the monitor only mode
for the time being.  A realtime FHST map was performed near the end of the
installation period.  Post installation, a vehicle slew and guide star
acquisiton were successful.  Science resumed at 139/2120Z, and continues to
be performed nominally.

       During the day, an SSR Failed Row Isolation Test was performed to
provide the SSR Anomaly Review Board (ARB) with more information as to why
the SSR is consistently generating correctable EDAC errors through a
specific logical block range.  This test has determined that row 28 in
array 2 is the row producing the errors.  Also, an SSR Interrupt Log
Installation was performed to provide the SSR ARB with additional
information as to what might be causing the 1773 bus message retries and
the retry failures.  Both the test and the installation were successfully
performed.  Data analyses from both procedures are proceeding.

       As detailed in HSTAR 6072, the STIS CCD reset during the SSA1 event
at 139/140823Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science and SMOV operations.
/DMH