HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2177

PERIOD COVERED:  0000Z (UTC) 07/30/98 - 0000Z (UTC) 07/31/98

Daily Status Report as of 212/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  This dark calibration program obtains 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 Two Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

       The Space Telescope Imaging Spectrograph (CCD) was used to measure
CCD dark current and bias rates for the two supported amplifier settings
{GAIN=1 and GAIN=4} in order to gather data for making superdarks and
superbiases.  The data will be used to track the growth of hot pixels on
the CCD in general and within the various target acquisition apertures
specifically.  The observations were executed as scheduled, and no
anomalies were noted.

   1.3 Completed NIC/1/2 7849 (Metallicity and the Cepheid Distance Scale)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of Cepheid variable stars in the NGC-4496 galaxy.  The local
distance scale to galaxies is largely based on the Cepheid
period-luminosity relation.  Motivated by the goal of measuring an accurate
value of the Hubble constant, HST has been used successfully to discover
scores of Cepheid variables in each of about 20 galaxies.  The observations
were executed as scheduled, and no anomalies were noted.

   1.4 Completed Five Sets of STIS/CCD 7944 (STIS Sparse Field CTE Test)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
STIS Sparse Field (CTE) test.  The CTE measurements are made using the
"sparse field test", along both the serial and parallel axes.  The test was
completed as scheduled, and no anomalies were noted.

   1.5 Completed Six Sets of WF/PC-2 8059 (POMS Test Proposal: WF-2
Targeted Parallel Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels.  Local group galaxies offer the opportunity
for a closer look at young stellar populations.  The observations were
completed as planned, and no anomalies were reported.

   1.6 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

       The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements.  A variety of internal exposures are obtained in
order to provide a monitor of the integrity of the CCD camera electronics
in both bays {gain 7 and gain 15}, a test for quantum efficiency in the
CCDs, and a monitor for possible buildup of contaminants on the CCD
windows.  A bias calibration and an internal flat calibration image were
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.7 Completed Two Sets of STIS/CCD 7910 (STIS Extragalactic Parallel Survey)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
extragalactic slitless spectrographic observations as part of the parallel
high galactic latitude survey to search for emission line galaxies.  Data
was taken in parallel, and are not subject to proprietary time.  The
observations were executed as scheduled, and no anomalies were noted.

   1.8 Completed Five Sets of STIS/CCD 8064 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal - Backup)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
non-scripted parallel POMS test.  The observations were completed as
scheduled, and no problems were reported.

   1.9 Completed Four Sets of STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements.  These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage.  The observations were completed as
scheduled, and no problems were reported.

   1.10 Completed NIC/2 7897 (Probing Planetary Formation Around
Main-Sequence Stars: A Snapshot Survey)

       The Near Infrared Camera (Camera Two) was used to make snapshort
survey images of the main sequence star HR2148 probing for planetary
formation.  The IR excess main-sequence stars host cool circumstellar dust
disks, which are most likely replenished by the debris of unseen
planetesimals.  The observations were completed as scheduled, and no
problems were noted.

   1.11 Completed STIS/MA1 7439 (H-Lyman Alpha Emission from the Upper
Atmosphere of Uranus)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
H-Lyman Alpha observations of the emissions from the upper atmosphere of
the planet Uranus.  An excess of H-Lyman Alpha emission from Uranus' sunlit
hemisphere has been detected by the IUE satellite since 1982, and some
excess was confirmed with the Voyager 2 UVS during the 1986 encounter with
Uranus.  The observations were executed as scheduled, and no anomalies were
noted.

   1.12 Completed Two Sets of NIC/1/2/3 7216 (Near-Infrared Observations of
NGC-6611 {M-16})

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the nebula NGC-6611 (a.k.a., M-16).  The NICMOS should
be able to extend the IMF statistics well into the subsolar-mass range and
examine many of the EGGs {i.e., Evaporating Gas Globules} seen in WF/PC-2
images.  The observations were completed as planned, and no problems were
reported.

   1.13 Completed NIC/1/2/3 7824 (Deep NIC Images of 20 High-Z Damped
Ly-Alpha Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the high-Z damped Lyman-Alpha (DLA) galaxy Q2116-358.
The HST imaging together with ground-based spectroscopy will unify
absorption-line studies and faint galaxy imaging studies, providing a
comprehensive picture of the history of assembly, star formation, gas
consumption, and chemical enrichment in the DLA galaxies.  The observations
were completed as planned, and no problems were reported.

   1.14 Completed WF/PC-2 7909 (POMS Test Proposal: WF II Parallel Archive
Proposal)

       The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal.  This test proposal is designed to simulate scientific
plans.  The observations were completed as planned, and no problems were
reported.

   1.15 Completed Three Sets of STIS/CCD 7908 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  The observations were completed as
planned, and no problems were reported.

   1.16 Completed NIC/1/2/3 7859 (Blue Compact Dwarf Galaxies -- Young or Old?)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the compact young dwarf galaxy UGC-6456.  These blue
compact dwarf galaxies challenge models of galaxy formation to explain the
presence of small, low-metallicity galaxies experiencing vigorous bursts of
star formation.  The observations were completed as scheduled, and no
problems were reported.

   1.17 Completed NIC/2 7227 (A Search for Low Mass/Sub-Luminous Companions
to M-Stars)
20|
       The Near Infrared Camera (Camera Two) was used to make a search for
low mass/sub-luminous companions to low mass M class stars.  Knowledge of
stellar and sub-stellar masses and luminosities at and below the ~0.08
M{sun} H-burning limit is of fundamental importance.  A dark calibration
image was also taken.  The observations were completed as planned, and no
problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 6
                                        Successful : 6

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 12
                             Successful : 12

   2.3 Operations Notes:

       HSTAR #6605 reports that there were long term unexpected changes in
the guide star which was used for the observation of M-87 (FOC #7274) at
212/0110Z. The same guide star was used last year with different results.
See Monday's Daily Report section 1.3 for more details.

No operational problems were reported.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH