HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2128

PERIOD COVERED:  0000Z (UTC) 05/20/98 - 0000Z (UTC) 05/21/98

Daily Status Report as of 141/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7926 (CCD Dark and Bias Monitor -- Continued)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
several dark and bias calibration observations.  This is 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.  These observations will also 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 Three Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  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 executed as scheduled, and no
anomalies were noted.

   1.3 Completed Two Sets of NIC/1/2/3 7596 (NICMOS MULTIACCUM Dark
Characterization)

       The Near-Infrared Camera Multi-Object Spectrograph (Cameras One, Two
and Three) was used to make a NICMOS MULTIACCUM dark characterization.  The
purpose of this proposal is to monitor the darks using three different
MULTIACCUM sequences.  The observations were executed as scheduled, and no
anomalies were noted.

   1.4 Completed STIS/CCD 7803 (Daily Darks to Update Acquisition Bad Pixel
Table Part III)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
daily dark calibration updates.  These daily darks are intended to identify
hot pixels for update to the acquisition on-board FSW hot pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were completed as planned, and no anomalies were reported.

   1.5 Completed STIS/CCD 7333 (STIS Images of 48 Damped Ly-Alpha Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the damped Lyman-Alpha galaxy Q1215+333.  This study will
unify absorption-line studies, and faint galaxy imaging studies, thereby
allowing a detailed treatment of the history of star formation, gas
consumption, chemical enrichment, and assembly in the population of
galaxies.  The observations were completed as planned, and no problems were
reported.

   1.6 Completed Three Sets of WF/PC-2 7909 (POMS Test Proposal: WF II
Parallel Archive Proposal)

       The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal.  This test proposal is designed to simulate scientific
plans.  As described in 2.1 and HSTAR 6484, the acquisition for the third
iteration of this proposal defaulted to fine lock backup.  Otherwise, the
observations were completed as planned, and no further problems were
reported.

   1.7 Completed Two Sets of NIC/2/3 7907 (NICMOS Pure Parallel Winter 97-98)

       The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel spectrographic observations of sky regions when another
instrument is prime.  As described in 2.1 and HSTAR 6484, the acquisition
for the second iteration of this proposal defaulted to fine lock backup.
Otherwise, the observations were completed as planned, and no further
anomalies were reported.

   1.8 Completed WF/PC-2 6587 (Black Holes and Cores of Early-Type Galaxies)

       The WF/PC-2 was used to make observations of early-type galaxy
NGC-2768 in order to study its nuclear core region and its possible black
hole.  The campaign to find black holes in the centers of galaxies using
HST has so far been highly successful.  The observations were completed as
planned, and no problems were reported.

   1.9 Completed NIC/2 7226 (Search for Massive Jupiters)

       The Near Infrared Camera (Camera Two) was used to make a corographic
search for massive planets around the nearby, young main sequence star
ROSAT116.  Because of the extreme youth of this object, any low-mass brown
dwarf and planetary companions will still be in a higher luminosity phase
and thus easily detectable.  A dark calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.10 Completed NIC/2 7227 (A Search for Low Mass/Sub-Luminous Companions
to M-Stars)

       The Near Infrared Camera (Camera Two) was used to make a search for
low mass/sub-luminous companions to the low mass M class star BRI1222-12.
Knowledge of stellar and sub-stellar masses and luminosities at and below
the ~0.08 M{sun} H-burning limit is of fundamental importance.  A dark
calibration image was also taken.  The observations were completed as
planned, and no problems were reported.

   1.11 Completed STIS/CCD/NIC/1/2/3 7566 (Demographics of Nuclear Black Holes)

       The Space Telescope Imaging Spectrograph (CCD) and the Near Infrared
Camera (Cameras One, Two and Three) were used to make observations of
normal galaxy NGC-3115 to try and detect a super massive black hole.  A
dark and wavelength calibration images were also taken.  The observations
were executed as scheduled, and no anomalies were noted.

   1.12 Completed NIC/2 7330 (The Fueling of Active Nucleii: A NICMOS
Snapshot Survey)

       The Near Infrared Camera (Camera Two) was used to probe the dark
matter distribution of NGC-2179 far from the center by observing
intervening absorption from the MgII doublet (lambda 2800) in the spectrum
of one background QSO located in a geometrically optimal position.  HST
observations are required because this feature is in a wavelength range not
accessible from the ground, and the QSO magnitudes and expected strength of
absorption make IUE observations unfeasible.  The proposal completed as
expected with no anomalies.

   1.13 Completed STIS/CCD/MA1/MA2 7673 (STIS MAMA Sensitivity and Focus
Monitor)

       The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to
make observations of standard star BD+28D4211 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.  As described in 2.1 and HSTAR 6484, the acquisition for this
proposal defaulted to fine lock backup.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.14 Completed WF/PC-2/STIS/CCD/NIC/1/2/3 7307 (The Formation and
Evolution of Rich Star Clusters in the LMC)

       The WF/PC-2, the Space Telescope Imaging Spectrograph (CCD), and the
Near Infrared Camera (Cameras One, Two and Three) were used to make
observations of the rich star cluster NGC-1868 which is located within the
Large Magellanic Cloud in order to study its formation and evolution.
These observations will help us understand the origin and evolution of rich
star clusters in our own galaxy.  The observations were completed as
scheduled, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 10
                                        Successful : 10

       The acquisition at 140/195357Z defaulted to fine lock backup on
FGS-3 only when FGS-1 exceeded the scan step limit.  HSTAR 6484 was
written.  The proposals described in 1.6, 1.7, and 1.13 may have been
affected.

       As described in HSTAR 6485, the acquisition at 141/044205Z defaulted
to fine lock backup on FGS-3 only when FGS-1 exceeded the scan step limit.
Two proposals, WF/PC-2 7909 and NICMOS 7887, which are presented in
tomorrow's report, may have been affected.

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates:

                              Scheduled : 24
                             Successful : 24

   2.3 Operations Notes:

       The SSR correctable EDAC counts were cleared on three occasions per
ROP SR-1.

       The STIS MCE-2 reset at 141/092137Z while the low voltage was on and
while in an SAA contour.  The STIS error counter was reset.  MAMA-2 will be
recovered via the SMS at 141/1734Z.  There was no impact to science
operations.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH