HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2371

PERIOD COVERED:  0000Z (UTC) 05/12/99 - 0000Z (UTC) 05/13/99

Daily Status Report as of 133/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 Completed Two Sets of 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 WF/PC-2 6698 (High Resolution Imaging of Bubble and
Superbubbles in H II Regions)

       The WF/PC-2 was used to make high resolution observations of the H
II region N11B.  Massive stars dynamically interact with their ambient
interstellar medium via fast stellar winds during their lifetime and via
supernova blasts at their demise.  The dynamical interaction causes the
physical structure of an H II region to evolve along with its ionizing
massive stars.  The observations were executed as scheduled, and no
anomalies were noted.

   1.4 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies.  This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies.  These data will be placed immediately into the Hubble Data
Archive.  The observations were completed as scheduled, and no problems
were reported.

   1.5 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.

   1.6 Completed STIS/CCD 8172 (STIS Deep DLA Imaging Survey II)

       The Space Telescope Imaging Spectrograph (CCD) was used to make deep
observations of quasar/alpha galaxy PC0953+474.  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
Damped Lyman-Alpha galaxies.  The observations were executed as scheduled,
and no anomalies were noted.

   1.7 Completed WF/PC-2 8090 (POMS Test Proposal: WF-II Parallel Archive
Proposal Continuation)

       The WF/PC-2 was used in the parallel mode to make some low galactic
latitude archive observations.  The program will be used to take parallel
images of random areas of the sky.  The observations were executed as
scheduled, and no anomalies were noted.

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

       The Space Telescope Imaging Spectrograph (CCD) 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 wavelength calibration observation was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.9 Completed WF/PC-2 7504 (Calibration of Nearby Type Ia Supernovae as
Standard Candles: The Next Three-Year Step)

       The WF/PC-2 was used to make observations of parent galaxy NGC-4527
in order to determining its Cepheid distance.  This is to continue the
calibration of the Type 1a supernova as standard candles.  The observations
were completed as planned, and no porblems were reported.

   1.10 Completed Three 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.

   1.11 Completed Three 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.

   1.12 Completed STIS/CCD/MA1 7673 (STIS MAMA Sensitivity and Focus Monitor)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations of standard star GRW+70D582 in order to perform a MAMA
sensitivity and focus monitoring program.  This is to monitor sensitivity
of each MAMA grating mode to detect any change due to contamination or
other causes.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as
Cosmological Tools)

       The WF/PC-2 was used to make survey observations of object
PKS1830-21 by obtaining deep, high-resolution images in the optical and
near IR in order to see if it is gravitational lensed and could be used as
a cosmological tool.  The observations were executed as scheduled, and no
anomalies were noted.

   1.14 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.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates:

                              Scheduled : 18
                             Successful : 18

   2.3 Operations Notes:

       Operations personnel continue to conduct daily operations from the
SAMS back-up facility, using the PRS ground system.

       Using ROP SR-1, the SSR EDAC error counter was cleared twice.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH