HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2294

PERIOD COVERED:  0000Z (UTC) 01/25/99 - 0000Z (UTC) 01/26/99

Daily Status Report as of 026/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three 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.

   1.2 Completed Two Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

       The Space Telescope Imaging Spectrograph (CCD) was used 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.  The data will be used 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 7279 (The Impact of Cluster Substructure on
Galaxies: A Case Study in ABELL 2125)

       The WF/PC-2 was used to make observations of the Abell-2125 galactic
cluster (a.k.a., the Butcher-Oemler Cluster) in order to study the impact
of the substructure of the cluster on galaxies.  The VLA data show that, as
well as a large blue-galaxy fraction {0.19} for its redshift, it has an
unprecedented number of radio galaxies {30 with confirmed redshifts},
evenly split between old stellar populations and starbursting galaxies.
The observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed STIS/CCD 7953 (STIS Slit Wheel Repeatability)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct
slit wheel repeatability test.  The test was completed as planned, and no
problems were reported.

   1.5 Completed Four 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 acquisition
failure described in 2.1 and HSTAR 6945 occurred for the final iteration of
this proposal.  The take data flag remained down, affecting one
observation.  Otherwise, the observations were completed as planned, and no
further anomalies were noted.

   1.6 Completed STIS/CCD 7310 (The Interaction of Accretion Disks with
Protostellar Binaries)

       The Space Telescope Imaging Spectrograph (CCD) was used to study the
interaction of the accretion disk with the protostellar binary system
LKCA7.  This should determine how the accretion disk interacts with stars
in young binary systems and will measure the rates that mass accumulates
onto each component of the pair.  A wavelength calibration image was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.

   1.7 Completed WF/PC-2 6837 (The Ultraviolet Properties of "Dwarf"
Seyfert 1 Nuclei)

       The WF/PC-2 was used to make ultraviolet observations of the
"dwarf", type one, Seyfert galaxy NGC-841.  This class of "dwarf" Seyfert
populate the faint end of the local AGN luminosity function and hold
important clues to the evolution of the entire AGN population.  The
observations were completed as scheduled, and no problems were reported.

   1.8 Completed WF/PC-2 6354 (Measuring Luminosity Evolution in Z = 0.3
Field Galaxies)

       The WF/PC-2 was used to make snapshot observations of the galactic
cluster Gal-Cluster-0732 located at a distance of Z = 0.3.  The targets
were drawn from a much larger pool of galaxies for which the internal
kinematics have been measured from an extensive ground based program.  The
observations were executed as scheduled, and no anomalies were noted.

   1.9 Completed STIS/CCD/MA1 7362 (Demystifying the SW Sextant Stars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make ultraviolet observations of the variable star DW-UMa (A SW Sextant
Class Star).  No bona fide SW Sextant star has ever been observed with HST.
The observations were completed as planned, and no anomalies were reported.


   1.10 Completed WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.11 Completed STIS/CCD 8022 (Supplement to the STIS Dynamics IKP)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of galaxy NGC-2841.  Detection of supermassive black holes in
normal galaxies is one of the grand challenges that HST was designed to
meet.  A wavelength calibration observation and a CCD flat were also
completed.  The observations were completed as scheduled, and no anomalies
were reported.

   1.12 Completed 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.

   1.13 Completed WF/PC-2 8061 (POMS Test Proposal: WF-II Backup Parallel
Archive Proposal)

       This is a POMS test proposal designed to simulate scientific plans.
The proposal was executed as planned, and no anomalies were reported.

   1.14 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
3C249.1.  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.

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

       The WF/PC-2 was to be used to make snapshot survey observations of
spiral galaxy NGC-2566 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 acquisition failure described in 2.1 and HSTAR 6945 occurred
for this proposal.  The take data flag remained down, affecting three
observations.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 5
                                        Successful : 2

       Per HSTAR 6945, the acquisition scheduled for 025/234403Z failed
when the search radius limit was exceeded.  The proposals described in 1.5
and 1.15 were affected.

                          Scheduled Reacquisitions : 7
                                        Successful : 5

       See note below concerning the Gyro-3 failure.

   2.2 FHST Updates:

                              Scheduled : 8
                             Successful : 5

       See note below concerning the Gyro-3 failure.

   2.3 Operations Notes:

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

       The K-relays were specially monitored in various formats in the
period 025/1913Z - 025/2202Z.

       At 025/235401Z the Gyro-3 motor current began to flag out-of-limits
high at 145.6 mA (the high limit is 132.0 mA) and continued to rise, the
signature for a gyro failure. Gyro-3 was automatically removed from the
control law, placing the HST in a three gyro configuration.  The vehicle
remained under RGA control only.  Accordingly, subsequent FHST updates at
026/002700Z, 026/002939Z, and 026/014648Z failed, as did the guide star
acquisitions at 026/004224Z and 026/020222Z.  Corresponding observations in
this period, all during the interval of the next report, were affected.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       A meeting will be held this morning to discuss the Gyro-3 anomaly,
as well as possible plans for recovery.  Until recovery is performed, the
HST will remain in RGA control, and no science will be performed.

/DMH