HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2295

PERIOD COVERED:  0000Z (UTC) 01/26/99 - 0000Z (UTC) 01/27/99

Daily Status Report as of 027/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

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

       The Space Telescope Imaging Spectrograph (CCD) was to be 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.  Each iteration of this proposal was affected by the
Gyro-3 anomaly that occurred yesterday.  (See 2.3)

   1.2 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.
Each iteration of this proposal was affected by the Gyro-3 anomaly that
occurred yesterday.  (See 2.3)

   1.3 Completed Two Sets of 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
3C135.0.  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 first iteration of this proposal was affected by the
Gyro-3 anomaly that occurred yesterday.  (See 2.3)  Otherwise, the
observations were completed as planned, and no further problems were
reported.

   1.4 Completed WF/PC-2 6675 (The Evolution of Galaxies in Groups)

       The WF/PC-2 was to be used to make observations of the radio galaxy
PKS0101+02.  This proposal was affected by the Gyro-3 anomaly that occurred
yesterday.  (See 2.3)


   1.5 Completed Three 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 first
iteration of this proposal was affected by the Gyro-3 anomaly that occurred
yesterday.  (See 2.3)  The successful re-acquisition occurred about five
hours into this 8-hour, 40 minute iteration.  Otherwise, the observations
were completed as planned, and no further anomalies were noted.

   1.6 Completed Two Sets of STIS/CCD 8084 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted parallel high galactic latitude observations as part of POMS
test proposal.  The observations were executed as scheduled, and no further
anomalies were noted.

   1.7 Completed STIS/CCD/MA1/MA2 7389 (Chromospheres and Transition Layers
in Hyades and Pleiades F stars)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make observations of the F class star HD21847 which is located in the
Hyades star cluster.  This proposal seeks to obtain additional empirical
constraints on the heating mechanisms for stellar chromospheres, transition
layers and coronae.  A wavelength calibration obseration was also taken.
The observations were completed as planned, and no problems were reported.

   1.8 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.

   1.9 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.

   1.10 Completed STIS/CCD 7350 (Testing the Supermassive Black Hole
Paradigm in Nearby Radio-Quiet AGNs)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the radio-quite active galactic nuclei NGC-3031.  Obtaining
a large sample of central engine mass determinations is a crucial first
step toward understanding the physics of AGN central engines, including the
puzzling difference between radio-loud and radio-quiet AGNs.  A wavelength
calibration observation and a CCD flat were also taken.  The observations
were completed as planned, and no anomalies were reported.

   1.11 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.

   1.12 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels.  Local group galaxies offer the opportunity
for a closer look at young stellar populations.  The observations were
completed as planned, and no anomalies were reported.

   1.13 Completed Two Sets of WF/PC-2 6633 (Cusps or Cores in Barred Bulges?)

       The WF/PC-2 was used to make observations of the SB class (Barred)
galaxies NGC-2950 and NGC-2880in order to study their nuclear bulge region
and cusps.  These are a highly tri-axial, tumbling, low-mass stellar
systems.  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 : 3
                                        Successful : 3

   2.2 FHST Updates:

                              Scheduled : 14
                             Successful : 14

   2.3 Operations Notes:

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

       After the Gyro-3 motor current flagged out-of-limits high at
025/2354Z (see yesterday's report for details), the flight software
autonomously took Gyro-3 out of the control loop.  A gyro bias error of
0.056 deg/min resulted.  A 3-gyro HLGBU was uplinked at 026/0155Z, and an
FHST map obtained at 026/0240Z initially calculated an attitude error of 5
to 6 degrees.  Since the stars could not be positively identified from the
map, the coarse attitude (sun sensors/magnetometers) was utilized to reduce
the error to 1 to 2 degrees.  An ARU/PRT was uplinked at 026/0600Z.
Another FHST map taken at 026/0615Z indicated an error of 54 arcsec, too
large for a re-acquisition search radius.  Accordingly, another ARU/PRT was
uplinked at 026/0650Z.  The re-acquisition at 026/0655Z was successful and
regular science operations commenced.  A type T2 slew was performed at
026/1120Z.  The high mode bias offset error was good.  Subsequent
acquisition/re-acquisition activity was nominal.  The proposals described
in 1.1 through 1.5 were either entirely or partially affected by these
events.  The HST continues in a 3-gyro configuration.

       Per an operations request, the NICMOS FPA sensors were enabled at
026/2054Z.

       As described in HSTAR 6947, batteries 5 and 6 temperatures flagged
out-of-limits high at 026/2106Z.  A SPA was taken off line to reduce the
charge current at 027/0313Z.  The temperature parameters returned to normal
ranges.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH