HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1905

PERIOD COVERED:  0000Z (UTC) 06/23/97 - 0000Z (UTC) 06/24/97

Daily Status Report as of 175/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of NIC/1/2/3 7709 (NICMOS MULTIACCUM Dark
Characterization 7/8)

       The purpose of this proposal is to obtain group 7 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.2 Completed WF/PC-2 6903 (WF/PC-2 Cycle 6 Calibration: Decontamination)

       The WF/PC-2 was used to make several calibration bias observations,
internal flats, K-Spot images and dark calibration images which are all
part of a Cycle 6 decontamination procedure.  No science was interleaved
with the dark exposures.  The observations were completed as scheduled, and
no problems were reported.

   1.3 Completed STIS/CCD 7659 (Daily Darks to Update Acquisition Bad Pixel
Table)

       The Space Telescope Imaging Spectrograph (CCD) was used to make dark
calibration images in order to update the acquisition bad pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed FOC/96 6570 (High-Redshift Galaxies and Their Contribution
to the Ionizing Background)

       The Faint Object Camera (f/96) was used to make ultraviolet
objective-prism spectroscopy observations of the high-redshifted galaxy
GAL-CFRS-1 in order to study its contribution to the ionization background
and to study its ultraviolet spectral energy distribution from shortward of
the Lyman limit to longward of Lyman-Alpha.  The observations were executed
as scheduled, and no anomalies were noted.

   1.5 Completed Five Sets of STIS/CCD 7700 (STIS Non-Scripted Parallel
Archive Proposal)

       The Space Telescope Imaging Telescope (CCD) was used to obtain
slitless spectroscopy with the G750L grism to search for emission line
galaxies at intermediate-to-high redshift.  Field galaxy surveys have shown
that at high redshift most galaxies have strong emission lines, and are
compact and blue.  This suggests that star formation rates were higher than
at present, and that AGN may have been more frequent.  The low background
and high resolution of HST separates these objects from the background.
The proposal completed as planned, and no problems were reported.

   1.6 Completed Five Sets of NIC/1/2/3 7710 (NICMOS MULTIACCUM Dark
Characterization 8/8)

       The purpose of this proposal is to obtain group 8 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.7 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.

   1.8 Completed STIS/CCD 7727 (STIS Non-Scripted Parallel Archive Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to obtain
parallel slitless spectroscopy with the G750L grism to search for emission
line galaxies at intermediate to high redshift.  Field galaxy surveys have
shown that at high redshift most galaxies have strong emission lines, and
are compact and blue.  The observations were completed as planned, and no
anomalies were reported.

   1.9 Completed STIS/CCD 7705 (NICMOS MULTIACCUM Dark Characterization 3/8)

       The purpose of this proposal is to obtain group 3 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.10 Completed STIS/MA2 7098 (Band I and Band II Flat Field Uniformity)

       The Space Telescope Imaging Spectrograph (MA2) was used to make Band
1 and Band 2 flat field uniformity calibration observations, and to measure
high S/N DFLAT to assess flat field uniformity, compare to lab calibration.
The observations were completed as planned, and no anomalies were reported.


   1.11 Completed Two Sets of STIS/CCD 7076 (STIS Corrector Alignment: Fine)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of GD153 as part of a fine correction alignment and
calibration procedure.  This is to refine the STIS corrector system into
alignment so that the image quality at the spectrographs slit plane is
optimized.  The observations were executed as scheduled, and no anomalies
were noted.

   1.12 Completed NIC/1/2/3 7705 (NICMOS MULTIACCUM Dark Characterization 3/8)

       The purpose of this proposal is to obtain group 3 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.13 Completed Three Sets of NIC/1/2/3 7706 (NICMOS MULTIACCUM Dark
Characterization 4/8)

       The purpose of this proposal is to obtain group 4 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  During this proposal, at 174/154705, there was a guide
star loss of lock which interrupted the STIS onboard target
acquisiiton/peakup.  In addition, one observation was affected.  There were
also five associated STIS status buffer messages.  HSTARs 6099 and 6100
were written.  There were no further reported problems.

   1.14 Completed STIS /MA1 7086 (STIS22MB STIS Slit to Detector Internal
Stability - MAMA - Part 2)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
slit-to-detector internal stability calibration observations.  This was to
determine the stability of the spectrograph to thermal variations in the
MAMA modes.  A dark calibration image was also taken.  The observations
were executed as scheduled, and no anomalies were noted.

   1.15 Completed WF/PC-2 6601 (Evolution of Binary Neutron Stars and Their
White Dwarf Companions: Part 2)

       The WF/PC-2 was used to make observations of the binary star
STAR-0034, which is known to be a neutron star, with a white dwarf
companion.  It is also a millisecond rate pulsar.  This is part of an
on-going program which is intended to enlarge the sample of known white
dwarf companions as new millisecond pulsars are discovered.  The
observations were executed as scheduled, and no anomalies were noted.

   1.16 Completed NIC/1/2/3 7703 (NICMOS MULTIACCUM Dark Characterization 1/8)

       The purpose of this proposal is to obtain group 1 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.17 Completed STIS/CCD 7125 (CCD Coronographic Imaging of the Disk of
Beta Pictoris)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
resolution coronographic imaging of the inner section of the edge-on disk
surrounding the star HD39060 (a.k.a., Beta Pictoris).  As described in
HSTAR 6102, the guide star acquisiiton at 174/215539 failed when the scan
step limit was exceeded.  The take data flag was not up when the small
angle request was issued.  Two associated status buffer messages were
issued.  All five observations were affected.  No further anomalies were
noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 7

       The failed acquisition is described in 1.17.

                          Scheduled Reacquisitions : 5
                                        Successful : 5

       As described in 1.13, there was one loss of lock.

   2.2 FHST Updates:

                              Scheduled : 21
                             Successful : 21

   2.3 Operations Notes:

       The STIS CS error flag was cleared at 174/2056Z.

       The STIS proposal described in 1.17 is an Early Release Observation,
but was affected by the guide star acquisiton failure described in that
paragraph.

       The NICMOS Coronagraphic hole position was updated at 174/2237Z.
NICMOS target acquisition parameters were modified at 174/2242Z.  The
NICMOS memory monitors were set-up at 175/0008Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science and SMOV operations.

/DMH