HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2361

PERIOD COVERED:  0000Z (UTC) 04/28/99 - 0000Z (UTC) 04/29/99

Daily Status Report as of 119/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 Completed Three 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 8152 (Mineralogy and Weathering History of Mars)

       The WF/PC-2 was used to make high spatial resolution and moderate
spectral resolution 5500 Angstrom to 10,000 Angstrom STIS long-slit imaging
spectroscopy observations of the planet Mars.  This is to identify and
globally map the planet's iron-bearing surface mineralogy.  The
observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed WF/PC-2 6357 (The Nuclear Morphology of Elliptical Galaxies)

       The WF/PC-2 was used to make images of the early type, large,
elliptical galaxy UGC-6062 (taken from a list of 150 galaxies) in order to
study its nuclear morphology.  This survey will complement Illingworth's
snapshot study of later Hubble types.  The observations were completed as
scheduled, and no anomalies were reported.

   1.5 Completed Five 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 WF/PC-2 8095 (Accurate Proper Motions of Galactic Halo
Populations)

       The WF/PC-2 was used to make observations of the galaxy NGC-5272 in
order to study the proper motion of its galactic halo population, which
include globular clusters and dwarf galaxies.  The proper motions of these
populations will be determined to unprecedented accuracy, approximately an
order of magnitude better than has been previously possible.  The
observations were executed as scheduled, and no anomalies were noted.

   1.7 Completed Five 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.

   1.8 Completed Two Sets of STIS/CCD 8393 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
POMS, non-scripted, low galactic latitude observations made in parallel
with the prime science observations.  The observations were executed as
scheduled, and no anomalies were noted.

   1.9 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.

   1.10 Completed STIS/CCD 8226 (Discerning the Origins of Blue Stragglers:
Masses and Rotation Rates)

       The Space Telescope Imaging Spectrograph (CCD) was used to study the
blue stragglers in globular cluster NGC-5272-BS.  Conventional wisdom holds
that the masses of Blue Straggler Stars in globular clusters are
significantly larger than the turnoff mass.  A wavelength calibration
observation was also taken.  The observations were executed as scheduled,
and no anomalies were noted.

   1.11 Completed Two Sets of 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.

   1.12 Completed STIS/CCD/MA2 7433 (UV Spectral Dating of Galaxies)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
ultraviolet spectrographic observations of HD128167 to calculate a highly
accurate library of UV stellar spectra that can be used to estimate the age
and metallicity of galaxies of intermediate age {between 1 and 8 Gyrs}.
The critical step in this effort is to test the model spectra against
high-quality UV spectra of real stars.  A wave length calibration image was
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.13 Completed WF/PC-2 6833 (A Cepheid Search in the Virgo Cluster
Galaxy NGC 4571)

       The WF/PC-2 was used to make observations of the Virgo Cluster
galaxy NGC-4571 in order to search for Cepheid variable stars.  The
determination of the distance to the Virgo Cluster is key to establishing
the value of the H_zero.  The observations were completed as planned, and
no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 9
                                        Successful : 9

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 16
                             Successful : 16

   2.3 Operations Notes:

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

       In preparation for GSFC Internal Simulation #2 (Capture/EVA #1), the
flight operations team transferred operations to the PRS ground system at
118/0949Z and to the SAMS back-up facility at 118/1050Z.

       Per ROP NS-3, the NSSC-1 status buffer was dumped and reset at
118/2258Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH