HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2107

PERIOD COVERED:  0000Z (UTC) 04/21/98 - 0000Z (UTC) 04/22/98

Daily Status Report as of 112/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 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.

   1.3 Completed 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.

   1.4 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-3630 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.

   1.5 Completed FGS 7677 (Monitor the Long Term Stability of FGS-3)

       The goal of these measurements is to monitor the internal positional
stability of FGS3 by measuring many stars in the M35 check field repeatedly
over a one year period.  The results of these measurements are the
stability characteristics of FGS3 which allow an estimate of differential
corrections to OFAD and plate scale.  The measurements were completed as
scheduled. with no reported anomalies.

   1.6 Completed Two 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.  The observations were completed as planned, and no problems were
reported.

   1.7 Completed NIC/1/2 7329 (The Nature of the Damped LyAlpha Absorbers
-- A New Study of Young Galaxies)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the young galaxy Q0449-1330 in order to study the nature of
its damped Lyman-Alpha Absorbers.  The damped Lyman-Alpha absorption line
systems {DLAs}, occasionally found in quasar spectra, provide one of only a
few practical methods of detecting and studying significant numbers of
galaxies at high redshifts.  The observations were executed as scheduled,
and no anomalies were noted.

   1.8 Completed STIS/CCD/WF/PC-2/NIC/2 7388 (Black Holes and the Centers
of Galaxies)

       The Space Telescope Imaging Spectrograph (CCD), the WF/PC-2, and the
Near Infrared Camera (Camera Two) were used to continue our survey of
centers of the nearby galaxy NGC-4291.  The major goal is to survey an
unbiased set of galaxies with a potentially wide range of black hole
masses.  The sample has been carefully chosen to optimize leverage on the
character of a proposed correlation of black hole mass with galaxy mass.  A
CCD flat field and wavelength calibration observation were also taken.  The
observations were completed as scheduled with no anomalies.

   1.9 Completed WF/PC-2 6713 (Geometric Measurement of Galaxy Distance)

       The WF/PC-2 was used to make observations of supernova remnant
SN1970G in order to make a distance calibration for the galaxy in which it
is located.  The supernova is being used as a powerful new geometric method
for the determination of a galaxy's distance, by obtaining high spatial
resolution imaging polarization of the candidate supernova light echoes.
The observations were completed as planned, and no anomalies were reported.

   1.10 Completed Six 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 S/C 5582 (FOC/48 Monthly Activation (Camera Section
Only): Cycle 4)

        This proposal was executed as scheduled, and no anomalies were noted.

   1.12 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.

   1.13 Completed Two Sets of 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.

   1.14 Completed WF/PC-2 7501 (Expansion Parallax Distances to Planetary
Nebulae)

   The WF/PC-2 was used to make parallax distance measurements of the
planetary nebulae NGC-6818, NGC-6741 and NGC-6751.  The largest impediment
to our understanding of planetary nebulae is the lack of reliable
distances.  Acquired by generalized statistical methods in all but a
handful of cases, individual PNe distances are often uncertain by factors
of two or more.  The observations were executed as scheduled, and no
anomalies were noted.

   1.15 Completed Two Sets of STIS/CCD 7911 (STIS Galactic Plane Pure
Parallel Program)

       The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude survey observations in parallel with the prime science
observations.  Short exposures with the 50CCD imaging mode will provide the
wavelength zero-point calibration.  These data will be placed immediately
into the Hubble Data Archive.  The observations were executed as scheduled,
and no anomalies were noted.

   1.16 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 12
                             Successful : 12

   2.3 Operations Notes:

       Using ROP SR-1, the SSR correctable EDAC errors were cleared three
times.

       The Battery #3 Capacity Check Test was begun at 111/1443Z, and
discharge began at 111/2150Z with the disconnect of SA section 3 from
Battery #3.  Discharge will terminate in approximately 16 hours from the
time of disconnect by the Special Hardware Limit Test which triggers at 15
volts.  Recording of engineering data on ESTR-2 was begun at 112/0900Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH