HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2365

PERIOD COVERED:  0000Z (UTC) 05/04/99 - 0000Z (UTC) 05/05/99

Daily Status Report as of 125/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 8081 (STIS CCD Hot Pixel Annealing)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a
dark and a bias calibration observation.  The effectiveness of the CCD hot
pixel annealing process is assessed by measuring the dark current behavior
before and after annealing and by searching for any window contamination
effects.  The observations were executed as scheduled, 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 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 Two Sets of WF/PC-2 7343 (Photometric Survey of Galaxies
lying Behind Gravitational Lens Cluster)

       The WF/PC-2 was used to make an extensive photometric survey of the
galaxies lying behind the exceptional gravitational lens cluster Abell
2218.  The distortion of these images has been mapped from the ground, and
shows one of the strongest signals to date, but the signal to noise is
still limited.  Using WFPC2 images we show that with two orbits on each of
22 fields covering the cluster we will obtain approximately 10000 galaxies
over a region extending to 0.9 Mpc/h from the cluster center.  The
observations were completed with no reported problems.

   1.5 Completed Four 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.

   1.6 Completed STIS/CCD 7930 (STIS CCD Binned Bias Monitor)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
numerous bias exposures in 1 x 2 binned mode in order to permit
construction of "superbias" frames in which the effects of read noise have
been rendered negligible.  The observations were executed as scheduled, and
no anomalies were noted.

   1.7 Completed Three Sets of STIS/MA1 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) 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.

   1.8 Completed WF/PC-2 6967 (Blue Continuum Snapshots of 3CR Radio -
Continued Galaxies)

       The WF/PC-2 was used to make observations of the radio galaxy
3C349.0.  Radio galaxies are an important class of extragalactic objects:
they represent one of the most energetic astrophysical phenomena and they
may be used as probes of their environments.  They are unique probes of the
early Universe.  The observations were completed as planned, and no
problems were reported.

   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 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.

   1.11 Completed WF/PC-2 6359 (Core Properties of the Bulges of Spiral
Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of spiral
galaxy NGC-7162 in order to study its central bulge.  The aim is to
investigate the core properties, correlations with global galactic
properties, and the frequency of occurrence of multiple and/or miscentered
nuclei.  The observations were completed as scheduled, and no anomalies
were noted.

   1.12 Completed Two Sets of STIS/MA2 7965 (STIS MAMA Fold Analysis for
Cycle 7)

       The Space Telescope Imaging Telescope (MA2) was used to conduct a
MAMA fold analysis  for cycle 7.  This proposal executes the same steps to
measure the fold distribution as the SMOV proposal {7106}, except that the
line lamp is used with ND filters instead of the flatfielding lamps.  The
proposal concluded with no reported problems.

   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 : 7
                                        Successful : 7

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates:

                              Scheduled : 17
                             Successful : 17

   2.3 Operations Notes:

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

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

       Using ROP RD-7, ESTR re-conditioning was performed at 125/0202Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH