HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2369

PERIOD COVERED:  0000Z (UTC) 05/10/99 - 0000Z (UTC) 05/11/99

Daily Status Report as of 131/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 7468 (Young Globular Clusters in Merger Remnants
-- Part 4)

       The WF/PC-2 was used to make observations of merging galaxy NGC-7727
to study its globular clusters.  Mergers seem to have played a major role
in determining the shapes and dynamics of E and S0 galaxies.  The
observations were executed as scheduled, and no anomalies were noted.

   1.2 Completed STIS/CCD 7949 (CCD Dark and Bias Monitor -- Cont. to June 99)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program.  It was also scheduled
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 Two Sets of 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 STIS/CCD 7634 (CCD Flat-Field Stability and Cosmetic
Defect Fraction)

       The Space Telescope Imaging Spectrograph (CCD) was used to
investigate and monitor the STIS CCD imaging flat-field stability and
cosmetic defects over monthly periods though out Cycle 7.  The observations
were executed as scheduled, and no anomalies were noted.

   1.5 Completed Four Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted
parallel Condition V proposal.  The observations were completed as
scheduled, and no anomalies were reported.

   1.6 Completed Two Sets of WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.7 Completed Two Sets of STIS/CCD 8470 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted
parallel Condition VI proposal.  The observations were completed as
scheduled, and no anomalies were reported.

   1.8 Completed Three Sets of STIS/MA2 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make a
dark calibration image.  This is to establish if the detectors are
performing nominally, that no internal movement of the MCP has taken place,
and establish dark level in orbit for a given operating temperature.  These
darks will be used in later image reduction and also trended over
instrument life time as indicators of detector degradation or damage.  The
observations were completed as planned, and no problems were reported.

   1.9 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
WR83 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.

   1.10 Completed STIS/CCD/MA1 7480 (The Changing Wind Structure of the
Erupting SMC WN/LBV System HD5980)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations of the changing wind structure in the erupting SMC,
Wolf-Rayet WN/LBV, binary star HD5980.  This is perhaps similar to the
Great Eruption in Eta Carinae.  A wave length calibration image was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.

   1.11 Completed WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.12 Completed WF/PC-2 7470 (A Snapshot Survey of Galactic Globular
Clusters)

       The WF/PC-2 was used to make snap shot survey observations of the
crowded center of the galactic globular cluster NGC-1261.  The resulting
color-magnitude diagram will include all stars down to about one magnitude
below the main-sequence turnoff.  The observations were completed as
scheduled, and no problems were reported.

   1.13 Completed 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.

   1.14 Completed WF/PC-2 6543 (Emission-Line & Continuum Imaging of the
Gravitational Lens System 2016+112)

       The WF/PC-2 was used to make emission line and continuum imaging of
the gravitational lens system 2016+112.  The proposed observations will
provide crucial data required for a theoretical model.  The observations
were executed as scheduled, and no anomalies were noted.

   1.15 Completed Two 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.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 7
                                        Successful : 6

       The acquisition scheduled for 131/164139Z failed.  There was no
attitude error indicated by the previous successful full maneuver updates.
HSTAR 7127 was written.  One proposal, WF/PC-2 7281, which occurred during
the period of the next report, was affected.

                          Scheduled Reacquisitions : 8
                                        Successful : 8

   2.2 FHST Updates:

                              Scheduled : 16
                             Successful : 16

   2.3 Operations Notes:

       The HST operations team continues to conduct business from the SAMS
back-up facility using the PRS ground system.

       Many HST personnel will participate today in the first session of
GSFC Internal Simulation #3 (Planning/EVA2).

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

       ESTR 2 was reconfigured to the beginning of tape at 130/1310Z per
ROP RD-1.

       As directed by ROP NS-5, engineering data reports were cleared at
130/1618Z.

       The ephemeris tables were uplinked, dumped and compared at 131/0142Z
per ROP DF-7.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH