HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2066

PERIOD COVERED:  0000Z (UTC) 02/23/98 - 0000Z (UTC) 02/24/98

Daily Status Report as of 055/0000Z

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 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 FGS 7597 (Long Term Stability of Transfer Scan Mode in FGS-1R)

       The Fine Guidance Sensors (FGS-1R) was used to make observations of
the standard star UPGREN69 in order to study the long term stability of the
Transfer Scan Mode.  The observations were executed as scheduled, and no
anomalies were noted.

   1.4 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.

   1.5 Completed NIC/1/2/3 7875 (Searching for Old Stellar Populations in
Candidate Proto-Spheroidals)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations searching for old stellar populations in candidate
proto-spheroid SA57-17731.  We have compelling evidence from WF/PC-2 images
that these galaxies have optical colors gradients.  The near-infrared is
necessary, however, to reveal color gradients large enough to separate
young and old stellar populations.  Only NICMOS imaging provides enough
spatial resolution and depth to resolve these gradients.  The observations
were completed as planned, and no problems were reported.

   1.6 Completed STIS/CCD 7711 (STIS CCD G750L Fringing Flats.)

       The Space Telescope Imaging Spectrograph (CCD) was used to
investigate and monitor the STIS CCD flat-field fringing in the G750L
grating at its nominal wavelength setting {7751A}.  WAVECALs were also
taken at the same gain and wavelength setting.  Typical S/N = 100 for each
integration, and gain = 4 on each.  The observations were executed as
scheduled, and no anomalies were noted.

   1.7 Completed Four Sets of 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.

   1.8 Completed STIS/CCD 7636 (STIS Spectroscopic CCD Flatfielding)

       The Space Telescope Imaging Spectroscope (CCD) was used to make a
CCD flat field calibration observation in the spectrographic mode.  A bias
calibration was also taken.  The observations were completed as planned,
and no anomalies were reported.

   1.9 Completed STIS/CCD 7928 (STIS Spectroscopic CCD Flatfielding --
Continued)

       The Space Telescope Imaging Spectrograph (CCD) was used to make CCD
flat field calibration images in the STIS spectroscopic mode.  The
calibrations were completed as planned, and no problems were reported.

   1.10 Completed NIC/1/2/3 7896 (A NIR Snapshot Survey of Ultraluminous IR
Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make snapshot survey observations of the ultraluminous infrared galaxy
IR11095-02.  Nearly all of these galaxies show evidence for a recent tidal
interaction, and we will search for evidence of the merger progenitors near
the center of each galaxy, a task made significantly easier with NIR
imaging.  The observations were completed as planned, and no anomalies were
noted.

   1.11 Completed NIC/2 7863 (The Nature of Gamma-Ray Burster Host Galaxies)

      The Near Infrared Camera (Camera Two) was used to study the nature of
a gamma-ray burster in the host galaxy GRB70228.  Of the two thousand
gamma-ray bursts detected in the last twenty-five years, only two have
identified optical counterparts.  About two hours into this almost six hour
proposal (and as reported in yesterday's report), at 054/082055Z, the
NICMOS instrument suspended.  At least the final four hours of science was
lost.

   1.12 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.

   1.13 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.

   1.14 Completed STIS/CCD 7635 (STIS CCD Hot Pixel Annealing)

       The Space Telescope Imaging Spectrograph (CCD) was used to test the
hot pixel annealing procedure.  The effectiveness of the CCD hot pixel
annealing process is assessed by measuring the dark current behavior before
and after annealing and by searching for any window contamination effects.
The observations were completed as planned, and no problems were reported.

   1.15 Completed STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements.  These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage.  The observations were completed as
scheduled, and no problems were reported.

   1.16 Completed STIS/MA1 7345 (Origin and Physical Conditions in the
Local Lyman-Alpha Forest)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of PG0804+761 in order to study the origin and physical
conditions in the local Lyman-alpha forest.  A wavelength calibration image
was also taken.  As reported in 2.1, the acquisition for this proposal
defaulted to fine lock on one FGS only.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.17 Completed NIC/3 7499 (NICMOS Extragalactic Parallel Grism Survey)

       The Near Infrared Camera (Camera Three) was to be used to make
observations as part of an extragalactic parallel Grism Survey.  This
proposal is a parallel program using NICMOS's unique capabilities for
slitless spectroscopy in the near IR.  This proposal did not execute since
NICMOS was in suspend.

   1.18 Completed NIC/2/3 7907 (NICMOS Pure Parallel Winter 97-98)

       The Near Infrared Camera (Cameras Two and Three) was to be used to
make pure parallel spectrographic observations of sky regions when another
instrument is prime.  This proposal did not execute since NICMOS was in
suspend.

   1.19 Completed Two Sets of 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-2639 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 first iteration of this
proposal did not execute since NICMOS was in suspend.  The second iteration
completed as expected with no anomalies.

   1.20 Completed NIC/1/2/3 7854 (The Onset of Axisymmetry in
Proto-Planetary Nebulae)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the axissysmitry of the proto-planetary nebula CIT6.
The high-resolution imaging and multicolor polarimetric capabilities of
NICMOS comprise a superb combination for studying the processes by which
evolved (approximately one solar mass) stars shed their outer layers to
form planetary nebulae.  About one hour into this almost four hour
proposal, at 054/1745Z, the NICMOS was recovered from suspend.

   1.21 Completed NIC/1 7867 (NICMOS Imaging of the Dusty CfA Seyfert Nuclei)

       The Near Infrared Camera (Camera One) was used to make observations
of the Seyfert Galaxy NGC-5695.  These data will allow us to determine if
the Seyfert Type 1/2 dichotomy is best explained by the unified model, the
evolutionary picture, or a combination of both of these scenarios.  The
observations were executed as scheduled, and no anomalies were reported.

   1.22 Completed NIC/1 7855 (The Evolution of Powerful Radio Galaxies)

       The Near Infrared Camera (Camera One) was used to make observations
of the powerful radio galaxy 4C32.44.  Our proposed NICMOS observations
combined with our multi-wavelength observing program will finally provide
us with the data we need to build a picture of how powerful radio galaxies
evolve.  The observations were completed as planned, and no porblems were
reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

       The acquisition at 054/123402Z defaulted to fine lock backup on
FGS-3 only when FGS-1 failed to acquire.  HSTAR 6362 was written.  The
proposal described in 1.16 may have been affected.

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 11
                             Successful : 11

   2.3 Operations Notes:

       It was determined that the cause of the NICMOS suspend at
054/082055Z was the detector 3 voltages going out of limits low.  A NICMOS
memory dump was performed at 054/1158Z per ROP NS-9.  Analysis of the dump
indicates that this event had the same signature as another event seen on
day 62 of last year.  NICMOS was successfully recovered from suspend at
054/1745Z.  Proposals detailed in 1.11, 1.17, 1.18, 1.19, and 1.20 were
affected.

       A NICMOS memory monitor for a single bit error was established at
054/1811Z.  Another memory monitor for the EDAC address was set up at
054/1924Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       DF-224 flight software 10.0 is scheduled to be installed today,
beginning at approximately 055/1743Z.

       Continuation of normal science observations and calibrations.

/DMH