HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1928

PERIOD COVERED:  0000Z (UTC) 07/25/97 - 0000Z (UTC) 07/28/97

Daily Status Report as of 209/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Eight Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This set of dark calibrations is intended to obtain three dark frames every
day to provide data for monitoring and characterizing the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.2 Completed Four Sets of 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.

   1.3 Completed Three Sets of 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 WF/PC-2 6436 (High-Resolution Narrow-Band Imaging of
Liners, in Search of Their Central Engines)

       The WF/PC-2 was used to make high-resolution, narrow-band
observations of the galaxy NGC-4192 in order to search for its central
engine and to try to image its liner.  More than 30% of all galaxies
contain liner nuclei, which may be the weakest but most common
manifestation of quasar activity.  The observations were completed as
planned, and no problems were reported.

   1.5 Completed Sixteen Sets of NIC/1/2/3 7779 (NICMOS One Orbit Parallel
- Camera 3 Focus)

       The Near Infrared Multi-Object Spectrograph (Cameras One, Two and
Three) was used to conduct a one-orbit camera focus test taken in parallel
with the prime science observations.  The tests were completed as
scheduled, and no anomalies were noted.

   1.6 Completed Sixteen Sets of STIS /CCD 7675 (STIS Non-Scripted Parallel
Archive Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used in the
parallel mode to obtain slitless spectroscopy with the G750L grating to
search for emission line galaxies at intermediate to high redshift.  The
observations were completed as planned, and no anomalies were reported.

   1.7 Completed Eight Sets of NIC/3 7780 (NICMOS Short One Orbit Parallel
- Camera 3 Focus Test)

       The Near Infrared Camera (Camera Three) was used to conduct a short
one orbit focus test which was conducted in parallel with the prime science
observations.  The observations were completed as scheduled, and no
anomalies were noted.

   1.8 Completed WF/PC-2 6902 (WF/PC-2 Cycle 6 Photometric Calibration
Monitor UV/OPT STD)

       The WF/PC-2 was used to make both ultraviolet and optical
photometric observations of the standard star GRW+70D582 as part of a Cycle
6 calibration procedure.  This observation was done immediately before and
after decontamination procedures.  The observations were completed as
planned, and no problems were reported.

   1.9 Completed WF/PC-2 7429 (Uranus' Vertical Haze Structure and its
Variation With Latitude)

       The WF/PC-2 was used to make wide range ultraviolet observations of
the planet Uranus in order to study its vertical haze structure and its
variation with latitude.  The wide wavelength range allows determination of
aerosol sizes and spectral characteristics superior to previous work.  The
observations were executed as scheduled, and no anomalies were noted.

   1.10 Completed Two Sets of WF/PC-2 6887 (A Photometric Search for Faint
Companions to Nearby Stars)

       The WF/PC-2 was used to make photometric search observations of the
nearby stars L789-6-A and L726-8-A 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.

   1.11 Completed Six Sets of 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 grating 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.

   1.12 Completed Two Sets of NIC/1/2/3 7775 (NICMOS Earth Flats)

       The Near Infrared Spectrograph Multi-Object Camera (NICMOS) was used
to make Earth flat calibration observations.  This proposal obtains a
series of Earth flats for a subset of narrow-, medium-and broad-band NIC 1,
2 and 3 filters.  These flats will be used to generate the master flats for
narrow-band filters and to determine the OTA illumination pattern as a
function of wavelength and camera.  The observations were completed as
scheduled, and no problems were noted.

   1.13 Completed FOC/96 6929 (FOC Cycle 6 Absolute Sensitivity Calibration)

       The Faint Object Camera (f/96) was used to make observations of
standard star GD153 as part of an absolute sensitivity calibration
procedure.  This proposal observed through a selection of filters designed
to give good wavelength coverage and to be a representative sampling of the
filters used by GOs in Cycles 4-6.  An internal flat calibration image was
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.14 Completed WF/PC-2 6720 (The Evolution of Radio Loud Quasars II)

       The WF/PC-2 was used to make observations of the radio loud quasar
MRC1349-29 as part of a mini-survey to study its evolution and morphology.
The observations were executed as scheduled, and no anomalies were noted.

   1.15 Completed WF/PC-2 6716 (The Pattern of Massive Star Formation in
Irregular and Amorphous Galaxies)

       The WF/PC-2 was used to make observations of the NGC-5253.  The
objective is to obtain deep WF/PC-2 images in far-ultraviolet (~1700 A0), U
, V, and I bandpasses of the stellar populations in four nearby galaxies
known from their observed far-ultraviolet luminosities to be forming
massive (OB) class stars.  The observations were completed as planned, and
no anomalies were reported.

   1.16 Completed WF/PC-2 6607 (The Origin and Nature of UV Bright Stars in
Globular Clusters - II)

       The WF/PC-2 was used to investigate the UV-bright stellar
populations of NGC-5904.  This galactic globular cluster is known to be
bright at the far-UV wavelengths, with known extended blue HB tails.  This
observation will complement data obtained during Cycle 5 and during the
UITAstro-1 flight in December of 1990.  The proposal completed as planned,
and no problems were noted.

   1.17 Completed Two Sets of WF/PC-2 6587 (Black Holes and Cores of
Early-Type Galaxies)

       The WF/PC-2 was used to make observations of early-type galaxies
NGC-5419 and NGC-4936 in order to study their nuclear core region and their
possible black holes.  The campaign to find black holes in the centers of
galaxies using HST has so far been highly successful.  The observations
were completed as planned, and no problems were reported.

   1.18 Completed WF/PC-2 6626 (Imaging of Z>1 - Massive Star Forming Galaxies)

       The WF/PC-2 was used to make observations of the massive
star-forming galaxy SSA13W which is known to have a redshift of Z>1.0.  The
central regions of the galactic strips have already been imaged with HST
and the current observations are to cover the samples required to finish
the set.  The observations were executed as scheduled, and no anomalies
were noted.

   1.19 Completed Two Sets of WF/PC-2 6789 (A Search for Intermediate-Age
Globular Clusters the Nearby Giant Elliptical Galaxy NGC 5128)

       The WF/PC-2 was used to make observations of the giant elliptical
galaxy NGC-5128 in order to search for intermediate-aged globular clusters.
This galaxy is the nearest giant elliptical galaxy.  An enormous body of
evidence now suggests that most of its major features  (e.g., a wide
central dust lane, an optical-, radio- and X-ray- luminous jet, numerous
bright shells, filaments and star-forming regions) are the result of a 1
Giga-year-old merger with a gas-rich system.  The observations were
completed as scheduled, and no problems were reported.

   1.20 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral
Galaxies)

       The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxy NGC-5188.  Near-IR data at HST
resolution are essential for correcting for the effect of dust and will
enable us to derive robust nuclear properties for the sample.  The
observations were executed as scheduled, and no anomalies were noted.

   1.21 Completed FOC/96 5940 (The Origin of the Alignment Effect:
Polarimetry of Two Z~1 Radio Galaxies)

       The Faint Object Camera (f/96) was used to make observations of the
high redshifted radio galaxy 3C324 (where Z = about 1.0 ) in order to study
the origin of the alignment effect by obtaining high spectral resolution
polarization images.  These polarimetric observations are crucial to the
understanding of the spectacular morphologies recently discovered in high
redshift radio galaxies by HST.  The observations were completed as
planned, and no problems were reported.

   1.22 Completed NIC/1/2/3 7328 (High Resolution IR Imaging Survey (IRIS)
of the Centers of the Nearest Active Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make high resolution infrared observations of the nearest active galaxy
Markarian (i.e., MARK-5) in order to study its inner nuclear region.
Observing in the near-IR minimizes the dust obstruction and maximizes
sensitivity to the old stellar population which dominates the mass.  The
observations were executed as scheduled, and no anomalies were noted.

   1.23 Completed WF/PC-2 6194 (WF/PC-2 Cycle 5: Polarization Proposal)

       The WF/PC-2 was used to make polarization observations of star
G191B2B  at four different spacecraft roll angles.  This should permit a
detailed and independent calibration of each polarizer quads.  The
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 24
                                        Successful : 24

                          Scheduled Reacquisitions : 22
                                        Successful : 22

   2.2 FHST Updates:

                              Scheduled : 50
                             Successful : 50

   2.3 Operations Notes:

       The MAMA1 was recovered to hold mode at 206/1916Z.

       Per HSTAR 6132, at 208/204237Z, the main bus C voltage went out of
limits low for one telemetry sample (three seconds).  The established limit
is -0.400 V and the value reached was -0.423 V.

       As described in HSTAR 6133, STIS encountered a MAMA2 MCE2 reset
during a zone of exclusion and outside of the South Atlantic Anomaly (SAA)
at 208/224952Z.  The closest SAA occurred at approximately 209/0155Z.
MAMA2 low voltage was on and the high voltage was off when the event
happened.  Memory monitors indicated a nominal MCE reset condition.  The
STIS internal logs were dumped at 209/0120Z and will be fully analyzed on
Monday.  The STIS Upset and the CS Error Counter were reset at 209/0302Z.
No STIS scientific proposals were affected.  The STIS proposal which began
at 209/040032Z was performed nominally.  MAMA2 high voltage is not
scheduled to occur until 210/1500Z.  Clearing the high voltage on event
flag will be coordinated with the STScI prior to this observation.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH