HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2330

PERIOD COVERED:  0000Z (UTC) 03/16/99 - 0000Z (UTC) 03/17/99

Daily Status Report as of 076/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 Completed Four Sets of WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats --
Part II)

       The WF/PC-2 was used to take Earth flat calibration images.  This
proposal obtains sequences of Earth streak flats to construct high quality
flat fields for the WF/PC-2 filter set.  The observations were executed as
scheduled, and no anomalies were noted.

   1.3 Completed WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental Darks pt3/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
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 completed as planned, and no anomalies were noted.

   1.4 Completed WF/PC-2 7339 (Sizes and Structures of Faint Blue Compact
Galaxies that are New Candidates for Proto-Spheroidal Galaxies)

       The WF/PC-2 was used to obtain two-band WFPC-2 images of a unique
sample of 12 faint blue compact galaxies at redshifts up to z ~ 0.7, that
are excellent new candidates for being spheroidal galaxies, caught in the
act of undergoing a major star-forming event.  The observations completed
with no reported anomalies.

   1.5 Completed Six Sets of STIS/CCD 8091 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation) [

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude, non-scripted, parallel observations.  The observations
were completed as planned, and no anomalies were noted.

   1.6 Completed Two Sets of WF/PC-2 7386 (A Snapshot Survey of Nova Shells)

       The WF/PC-2 was used to make observational images of the super nova
shells V1419-AQL and NOVA-CIR-1in order to detect and measure its expanding
gaseous shell.  These observations will trace the distribution of hot and
cool gas in the nova shells, and show their degree of inhomogeneity on both
large and small scales.  The observations were completed as scheduled, and
no problems were noted.

   1.7 Completed WF/PC-2 8251 (The Second-Parameter Effect in Metal- Rich,
Globular Clusters: A Snapshot Study of NGC 6441)

       The WF/PC-2 was used to observe the newly- discovered hot horizontal
branch (HB) populations in the metal-rich globular clusters (GCs) NGC 6388
and NGC 6441 providing an unique opportunity for unraveling the
second-parameter effect.  While it has long been known that at least one
parameter besides the metallicity, Fe/H, determines the HB morphology of
GCs, our ignorance as to the nature of this second parameter {or
parameters} has been a major stumbling block in understanding the formation
history and age of the GC system.  The proposal completed nominally with no
reported problems.

   1.8 Completed Two Sets of WF/PC-2/STIS/CCD 7615 (Determination of the
Mass Function of a Globular Cluster Through Gravitational Microlensing)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make gravitational microlensing observations of the large globular
cluster NGC-6656 located in Sagittarius in order to study its mass
function.  Gravitational microlensing offers a unique and direct method of
determining the masses of stars and other compact objects down to planetary
masses.  A bias and dark calibration observations were also taken.  The
observations were completed as planned, and no problems were reported.

   1.9 Completed WF/PC-2 6815 (The Origin of the Polarization in the
Gravitationally Lensed "Cloverleaf" BAL QSO)

       The WF/PC-2 was used to obtain polarimetry that will explore the
polarization mechanism operating in the gravitationally lensed "Cloverleaf"
broad absorption line {BAL} QSO H1413+1143.  The observations were
completed, and there were no reported anomalous activity.

   1.10 Completed WF/PC-2 7282 (A Continuing Snapshot Survey for Compact
Stellar Groups and Clusters around Wolf-Rayet Stars)

       The WF/PC-2 was used to make observations of the Wolf-Rayet star
WR98A as part of a continuing snapshot survey of compact stellar groups and
clusters.  The newly imaged clusters allow us to accurately determine the
distances, luminosities, and ages of the WR members.  The observations were
executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 10
                                        Successful : 10

                          Scheduled Reacquisitions : 8
                                        Successful : 8

   2.2 FHST Updates:

                              Scheduled : 17
                             Successful : 17

   2.3 Operations Notes:

       The SSR EDAC error counter was cleared five times per ROP SR-1.

       The Gyro-3 drift rate bias slope for the last seven-day interval is
-31.20 arcseconds/hour/day (was 41.36).  The slope for the last two-day
interval is -27.19 arcseconds/hour/day.  Both values exceed the trend
limit of +/- 10.8 arcseconds/hour/day for Gyro-3 installation into the
control loop.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH