HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2109

PERIOD COVERED:  0000Z (UTC) 04/23/98 - 0000Z (UTC) 04/24/98

Daily Status Report as of 114/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two 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.

   1.2 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.

   1.3 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.

   1.4 Completed FOC/96 7923 (FOC F/96 Turnon)

       The Faint Object Camera (f/96) was used to take an internal flat and
a dark to ensure that the 30 day limit for the FOC is not exceeded.  The
observations were executed as scheduled, and no anomalies were noted.

   1.5 Completed STIS/CCD 7908 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  The observations were completed as
planned, and no problems were reported.

   1.6 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

       The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements.  A variety of internal exposures are obtained in
order to provide a monitor of the integrity of the CCD camera electronics
in both bays {gain 7 and gain 15}, a test for quantum efficiency in the
CCDs, and a monitor for possible buildup of contaminants on the CCD
windows.  A bias calibration and an internal flat calibration image were
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.7 Completed NIC/1/2/3 7596 (NICMOS MULTIACCUM Dark Characterization)

       The Near-Infrared Camera Multi-Object Spectrograph (Cameras One, Two
and Three) were used to make a NICMOS MULTIACCUM dark characterization.
The purpose of this proposal is to monitor the darks using three different
MULTIACCUM sequences.  As reported in yesterday's report and HSTAR 6446,
the acquisition for this proposal defaulted to fine lock backup on one FGS
only.  Otherwise, the observations were executed as scheduled, and no
further anomalies were noted.

   1.8 Completed STIS/CCD/MA1/MA2 7510 (High-Speed UV Spectroscopy of the
Ultracompact Binary 4U 1626--67/KZ TrA)

       The Space Telescope Imaging Spectrograph (CCD. MA1 and MA2) was used
to make high speed ultraviolet spectrographic observations of the
ultra-compact, x-ray, binary star KZ TrA.  This star has an orbital period
of 43 minutes.  A wavelength calibration image and a CCD flat image were
also taken.  As reported in yesterday's report and HSTAR 6446, the
acquisition for this proposal defaulted to fine lock backup on one FGS
only.  Otherwise, the observations were executed as scheduled, and no
further anomalies were noted.

   1.9 Completed Four 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 reported in yesterday's report and HSTAR 6446, the acquisition
for the first iteration of this proposal defaulted to fine lock backup on
one FGS only.  Otherwise, the observations were completed as planned, and
no further problems were reported.

   1.10 Completed Five 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.  The observations were completed as planned, and no
anomalies were reported.

   1.11 Completed Two Sets of NIC/2 7226 (Search for Massive Jupiters)

       The Near Infrared Camera (Camera Two) was used to make a
coronagraphic search for massive planets around nearby, young main sequence
stars.  Because of the extreme youth of these objects, 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.

   1.12 Completed NIC/1/2/3 7868 (Near-IR Cores of Radio Galaxies, Are the
AGN's Moving in the Galaxy?)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the core region of radio galaxy NGC-4261.  Near-IR
colors maps will determine the location of dense gas responsible for the
obscuration and fueling of the AGNs.  The observations were completed as
scheduled, and no problems were reported.

   1.13 Completed WF/PC-2 7277 (Calibration of the Cepheid P-L Relation
with Observations of the Maser-Host Galaxy NGC)

       The WF/PC-2 was used to make observations of the maser-host galaxy
NGC-4258 to study its Cepheid variable stars.  These data will help refine
the calibration of the Cepheid period-luminosity relationship.  The
observations were completed as scheduled, and no problems were reported.

   1.14 Completed FGS 7486 (Fixing the Mass of the Bright Giant HD 173764)

       The Fine Guidance Sensors (TRANS Mode) were used to make astrometric
observations of the large, massive, giant, spectroscopic binary star
HD173764 (Class G4 II + B9  ) which has an estimated distance of about 150
PCS.  With its 832 day period, the binary will be observable over a large
range of orbital motion during the next year.  The observations were
executed as scheduled, and no anomalies were noted.

   1.15 Completed NIC/1/2/3 7832 (The Age of Inner Bulge Globular Clusters)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the globular cluster Terzan-5 which is located in the
Milky Way's central bulge.  Until recently very little was known about the
age the globular clusters of the galactic bulge, as a combination of
crowding, differential reddening, and distance made turnoff photometry
beyond the reach of ground based observations.  The observations were
completed as planned, and no problems were reported.

   1.16 Completed NIC/1/2/3 7824 (Deep NIC/2 Images of 20 High-Z Damped
Ly-Alpha Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations the high-z damped Lyman-Alpha galaxy Q2116-358.  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 DLA galaxies.  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 : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 15
                             Successful : 15

   2.3 Operations Notes:



3.0 SIGNIFICANT FORTHCOMING EVENTS:

HST In orbit 8 years!! Orbit #43613 @ 9:03 DST a.m. having traveled 1.134
billion miles.

/DMH