HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2313

PERIOD COVERED:  0000Z (UTC) 02/19/99 - 0000Z (UTC) 02/22/99

Daily Status Report as of 053/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Five 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 STIS/CCD/MA1 7513 (The Stellar Content of Giant HII Regions)

       The Space Telescope Imaging Spectrograph (CCD/MA1) was used to
obtain spectroscopy of the giant HII region TOL89 over the wavelength range
1200 Angstrom -- 10000 Angstrom.  The proposal completed with no reported
problems.

   1.3 Completed Three Sets of 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.

   1.4 Completed STIS/MA1 7471 (STIS Snapshot Search for UV-bright High
Redshift Quasars)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
ultraviolet observations of the bright high redshifted quasar CSO118.  This
quasar shows no signs of strong absorption in its optical spectra, and its
He-II Lambda 304 A0 line is accessible with HST.  The observations were
executed as scheduled, and no anomalies were noted.

   1.5 Completed Four 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.

   1.6 Completed WF/PC-2 6588 (High Resolution Imaging of Ionized Gas in
the Disk-Halo Interface of Spiral Galaxies)

       The WF/PC-2 was used to make high resolution imaging of the halo
disk in spiral galaxy NGC-891 in order to study its ionized gas.
Observations of the interstellar medium at the disk-halo interface of
spiral galaxies provide us with very significant information on the
physical state and structure of the interstellar medium in a global sense.
The observations were executed as scheduled, and no anomalies were noted.

   1.7 Completed Ten 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 observations
were completed as planned, and no anomalies were noted.

   1.8 Completed 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
anomalies were noted.

   1.9 Completed FOC/96 6350 (FOC spectroscopy of BALQSOs)

       The Faint Object Camera (f/96) was used to make ultraviolet
spectrographic images of BALQSO 0146+0142 which is known to show broad
emission lines from abundant ions.  This will help us improve our knowledge
of these BAL class objects.  The observations were executed as scheduled,
and no anomalies were noted.

   1.10 Completed STIS/CCD 7361 (The Nature of Nuclear Activity in Nearby
Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the nuclear region of galaxy N3992.  The high resolution
spectra will be used to search for broad components in H-Alpha and for
velocity gradients, indicative of gas rotation or other ordered motions.  A
wavelength calibration image was also taken.  The observations were
executed as scheduled, and no anomalies were noted.

   1.11 Completed WF/PC-2 7447 (The Cosmological Evolution of Quasar Host
Galaxies)

       The WF/PC-2 was used to make observations of the host galaxy which
surrounds quasar 1258-015 in order to study its cosmological evolution.
The observations were executed as scheduled, and no anomalies were
reported.

   1.12 Completed Two Sets of STIS/CCD/MA1 8043 (Physical Properties of H-I
and H-II Regions)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations of the early-type stars HD109399 and HD99857 in order to
study thier H-I and H-II regions.  Interstellar absorption lines within the
wavelength intervals 1170-1370A and 1630-1890A in the spectra of 10
early-type stars are being observed with the highest resolution mode of
STIS.  A wavelength calibration image was also taken.  The observations
were executed as scheduled, and no anomalies were noted.

   1.13 Completed Two Sets of WF/PC-2 6353 (A Snapshot Emission Line
Imaging Survey of Very Low Excitation Planetary Nebulas)

       The WF/PC-2 was used to make snapshot observations as part to an
emission line survey of the very low excitation planetary nebulae
PK325-12D1 and PK296-06D1 (Class PNe).  These targets were selected based
on the O III/H alpha line flux ratio.  The observations were executed as
scheduled, and no anomalies were noted.

   1.14 Completed WF/PC-2 6356 (SNAPSHOT Survey of Ultraluminous Infrared
Galaxies)

       The WF/PC-2 was used to make observations of GAL-10559 as part of a
survey of ultraluminous infrared galaxies.  The nature of ultraluminous
infrared galaxies has generated considerable controversy.  The two main
issues are: {1} are they powered by violent bursts of star formation or by
hidden quasars?  {2} are interactions and mergers invariably involved?  The
observations were executed as scheduled, and no anomalies were noted.

   1.15 Completed STIS/CCD/MA2 7749 (The wind momentum-luminosity
relationship for LMC A- and B-supergiants)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
make observations of the supergiant star HD269781 which is located in the
Large Magellanic Cloud.  The wind momentum-luminosity relationship for
supergiant stars provides the means to determine the distances of these
objects in other galaxies more accurately than traditional methods.  A
wavelength calibration image was also taken.  The observations were
executed as scheduled, and no anomnalies were noted.

   1.16 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.

   1.17 Completed WF/PC-2/STIS/CCD 8018 (Demographics of Nuclear Black Holes)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make observations to study the nuclear region of the normal galaxy
M-33 in order to study the demographics of black holes.  Detection of
supermassive black holes in normal galaxies is one of the grand challenges
that HST was designed to meet.  A wavelength calibration and a CCD flat
observations were also taken.  The observations were executed as scheduled,
and no anomalies were noted.

   1.18 Completed WF/PC-2 6458 (Imaging of QSO Host Galaxies at Z >2)

       The WF/PC-2 was used to make observations of the QSO/host galaxy
0820+296.  QSOs of redshift larger than two have been resolved with
~arcsecond resolution on 4m-class ground-based telescopes.  Both line and
continuum flux have been detected over a few arcseconds, but the nature of
the extended emission, and its relation to the nuclear energy source is
unclear.  The observations were executed as scheduled, and no anomalies
were noted.

   1.19 Completed WF/PC-2 8019 (The Nuclear Region of NGC 4151)

       The WF/PC-2 was used to make ultraviolet and visible observations of
the nuclear region of the Seyfert type galaxy NGC-4151.  The observations
were completed as planned, and no anomalies were reported.

   1.20 Completed Two Sets of WF/PC-2 7387 (T-Tauri Star Snapshot Survey)

       The WF/PC-2 was used to make observations of the variable stars
VW-Cha and S-Cra as part of a T-Tauri class star survey.  The observations
were executed as scheduled, and no anomalies were noted.

   1.21 Completed WF/PC-2/STIS/CCD/NIC/2/3 7587 (Ionization Structure of
SN1987A Circumstellar Ring System)

       The WF/PC-2, Space Telescope Imaging Spectrograph (CCD), and the
Near Infrared Camera (Cameras Two and Three) were used to make observations
of the super nova LMC-SN1987 and its circumstellar material which is
located in the Large Magellanic Cloud.  These data will create spatially
resolved maps of the circumstellar gas in important emission lines to
determine the ionization and density structure of the inner ring.  A
wavelength calibration observation was also taken.  The observations were
completed as scheduled, and no anomalies were reported.

   1.22 Completed WF/PC-2 7377 (Dwarf Elliptical Galaxy Snapshot Survey II)

       The WF/PC-2 was used to make observations of the dwarf elliptical
galaxy FCC247 as part of Snapshot Survey II.  This survey will provide
important information on the globular cluster systems of such galaxies and
the properties of their cores and nuclei.  The observations were completed
as planned, and no anomalies were reported.

   1.23 Completed WF/PC-2 7282 (A Continuing Snapshot Survey for Compact
Stellar Groups and Clusters around Wolf-Rayet Stars)

       The WF/PC-2 was used to make observations of the Wolf-Rayet star
WR12 as part of a continuing snapshot survey of compact stellar groups and
clusters.  The newly imaged clusters allow us to accurately determine the
distances, luminosities, and ages of the WR members.  The observations were
executed as scheduled, and no anomalies were noted.

   1.24 Completed STIS/CCD 8036 (STIS observations of Eta-Carinae: High
Ionization and Internal Nebular Structure)

       The Space Telescope Imaging Spectrograph (CCD) was used to study the
high ionization and internal nebular structure of Eta-Carinae.  In the past
two years, observations of Eta-Carinae have revealed much new and very
exciting information.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.25 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.

   1.26 Completed WF/PC-2 7505 (The Hubble Diagram for Distant Supernovae
Measuring Cosmic Deceleration and Global Curvature)

       The WF/PC-2 was used to make observations of Super Nova SN1999A1 in
order to produce a precise Hubble diagram from measuring cosmic
deceleration and global curvature.  HST can make an essential contribution
by providing photometry with substantially higher precision and better
temporal coverage than can be obtained from the ground.  The observations
were completed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 22
                                        Successful : 22

                          Scheduled Reacquisitions : 24
                                        Successful : 24

   2.2 FHST Updates:

                              Scheduled : 53
                             Successful : 53

   2.3 Operations Notes:

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

       TTR 20608 was written due to an inability to receive 4kb I-channel
data on day 050 even though TDW had lock on the data.  The data was
recoverable.  TTR 20614 documented a data drop-out from 051/124811Z to
051/124848Z.  The data was unrecoverable.  TTR 20617 was written for a
Q-channel engineering data drop-out due to a re-cycle of equipment at WSGT
from 051/213656Z until 051/214130Z.  All but one minute of the data was
unrecoverable.  TTR 20618 was for a data hit at 052/014559Z, resulting in
158 missing minor frames.  TTR 20619 documented a data drop-out from
052/031658Z to 052/031733Z due to WSGT equipment problems.  Thirty-five
seconds of 32kb real-time data was lost.  TTR 20619 was for a data drop-out
from 052/131759Z until 052/131856Z during which 37 seconds of 32kb
real-time data was lost.  TTR 17864 was for a data inversion at
052/182103Z.  TTR 20622 was written when the I-channel SPC dump could not
be locked on after a GCMR.

       The NICMOS FPA temperature sensor for detector-1 was enabled at
053/0605Z.

       As documented in HSTAR 7010, the CCS string "A" stopped updating
telemetry at 053/0155Z due to a FEP memory hardware failure.  Real-time
operations switched to the PRS system where they remain this morning.

       The Gyro-3 drift rate bias trend for day 050 showed another step
shift.  The rate of change over a two-day period was 2.14 arcseconds/hour
per day.  While this trend does not exceed the desired limit of 10.8
arseconds/hour per day, it is felt that the rate is due to the step shift
dominating the general bias trend.  Gyro-3 is still not considered
sufficiently stable to be returned to the control loop.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH