HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2308

PERIOD COVERED:  0000Z (UTC) 02/12/99 - 0000Z (UTC) 02/15/99

Daily Status Report as of 046/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Six 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.

   1.2 Completed Eight 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.

   1.3 Completed STIS/CCD/MA1 7263 (Physical Processes in Stellar
Atmospheres: Comparative Analysis of the Sun and Alpha Cen A)

       The Space Telescope Imaging Spectrograph (CCD and MA1)  were used to
study the physical processes in the stellar atmosphere of Alpha-Cen (a)
(a.k.a., HD128620).  Using this atmosphere along with observed velocity
fields, we will reassess competing theories for various phenomena observed
in solar-type stars.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed Seven 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.

   1.5 Completed Two Sets of STIS/CCD 7475 (The Chemical Content of the
Universe at Z< 1.6)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the background quasar Q0454+0356 and Field-Q093.  Damped
Lyman-Alpha absorption systems provide a means of directly probing the
chemical content of the deep universe.  A wavelength calibration image was
also taken.  There was a Guide Star Acquisition which resulted in a Fine
Lock Backup at 045/1423Z due to a FGS #1 SSLE. The subsequent reacquisiton
(1,3,1) resulted in fine lock backup, Fine lock was achieved using the same
primary FGS #1 (1,0,1).
HSTART 6997 was written.  No other problems were reported.

   1.6 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.

   1.7 Completed STIS/CCD 7297 (Understanding the Red Rectangle and its
Central Binary HD 44179)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the Red Rectangle and its central binary star HD44179.  The
Red Rectangle is one of the nearest and best known of the proto-planetary
nebulae.  A wavelength calibration observation was also taken.  The
observations were completed as planned, and no problems were reported.

   1.8 Completed WF/PC-2 7386 (A Snapshot Survey of Nova Shells)

       The WF/PC-2 was used to make observational images of the super nova
shell Nova-Lup-1 in order to detect and measure its expanding gaseous
shell.  These observations will trace the distribution of hot and cool gas
in the nova shells, and show their degree of inhomogeneity on both large
and small scales.  The observations were completed as scheduled, and no
problems were noted.

   1.9 Completed Twelve 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.  There was a Guide
Star Acquisition which resulted in a Fine Lock Backup at 045/1423Z due to a
FGS #1 SSLE. The subsequent reacquisiton (1,3,1) resulted in fine lock
backup, Fine lock was achieved using the same primary FGS #1 (1,0,1).
HSTART 6997 was written.  no other anomalies were noted.

   1.10 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 1239-041 in order to study it cosmological evolution.  The
observations were executed as scheduled, and no anomalies were reported.

   1.11 Completed Three 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 nebula
PK285-02D1, PK002-03D3 and PK326-06D1 (Class PNe).  This target was
selected based on the O III/H alpha line flux ratio.  The observations were
executed as scheduled, and no anomalies were noted.

   1.12 Completed FOC/96/WF/PC-2 7274 (Secular Changes in the Jet of M-87)

       The Faint Object Camera (f/96) and the WF/PC-2 were both used to
make observations of the secular changes in the jet coming off of the
active galactic nuclei of galaxy M-87.  Past observations with the FOC have
shown changes as small as 0.03", and provide a unique opportunity to study
proper motions and structural changes of the jet.  An internal flat
calibration image was also taken.  The observations were completed as
scheduled, and no anomalies were reported.

   1.13 Completed WF/PC-2 6357 (The Nuclear Morphology of Elliptical Galaxies)

       The WF/PC-2 was used to make images of the early type, large,
elliptical galaxy ESO376-9 (taken from a list of 150 galaxies) in order to
study its nuclear morphology.  This survey will complement Illingworth's
snapshot study of later Hubble types.  There was a guide star acquisition
failure (3,0,3) at 044/0122Z. Neither the Scan Step or SRLE flags were set.
HSTAR 6992 was written.  No other anomalies were reported.

   1.14 Completed Two Sets of STIS/MA2 7748 (The Origins of Boron)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
observations of the stars HD294297 and HD294297 which is part of the Orion
OB1 class association in order to study the origins of Boron.  The youngest
stars show higher oxygen abundances than the oldest stars.  A wavelength
calibration image was also taken.  The observations were completed as
planned, and no problems were reported.

   1.15 Completed STIS/CCD 7436 (A Complete Sample of Hot Post-AGB Stars in
Globular Clusters)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the globular cluster NGC-1904.  Recent observations with
the Ultraviolet Imaging Telescope have provided a complete sample of the
hot post asymptotic giant branch {post-AGB} population in fourteen globular
clusters.  A wavelength calibration image was also taken.  The observations
were completed as planned, and no anomalies were reported.

   1.16 Completed STIS/CCD/WF/PC-2 7367 (Multi-Wavelength Imaging of
Circumstellar Disks in the Orion Nebula)

       The Space Telescope Imaging Spectrograph (CCD) and the WF/PC-2 were
used to make multi-wavelength imaging of circumstellar disks (NGC-1976)
seen as silhouettes against the bright emission-line background in the
Orion Nebula.  With these data one should be able to examine the radial
structure of the disks in great detail, and over a wide spatial extent.
The observations were completed as planned, and no problems were reported.

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

       The WF/PC-2 was used to make observations of the stars SZ-68 and
RU-Lup as part of a T-Tauri class star survey.  The observations were
executed as scheduled, and no anomalies were noted.

   1.18 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
anomalies were noted.

   1.19 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 VCC1448 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.

   1.20 Completed Three Sets of 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 SN1998 C1,
A1 and A2 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.  Before
the start of the observations the Gyro #1 Saturation Safing Flag was out of
limits (OOL) for one sample (12 Seconds) at the end of a slew at 045/1033Z.
HSTAR 6996 was written.  No other anomalies were reported.

   1.21 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
1338+277.  QSOs of redshift larger than 2 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.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 24
                                        Successful : 23

       There was a guide star acquisition failure (3,0,3) at 044/0122Z.
Neither the Scan Step or SRLE flags were set.  HSTAR 6992 was set. See
Proposal 6357 (Section 1.13 of this report).

                          Scheduled Reacquisitions : 27
                                        Successful : 27

   2.2 FHST Updates:

                              Scheduled : 51
                             Successful : 51

   2.3 Operations Notes:

        The NICMOS FPA Temerature Sensor Dectector #2 (NFPA2TMP) was
observed to have a value > 300 Degrees (K) at 045/2040Z.  Per Ops Note
#552, OR 14292 was executed to re-enable the EPA temperature sensor at
045/2307Z. The MOSES SISE was notified. HSTAR 6998 was written.

       There were twenty five missing minor frames of data at 046/0516Z
(TTR 20588). There was a data inversion (TTR 17864) at 046/0522Z, 0526Z,
and 0543Z  (generic TTR).

       A SIP was executed at 043/2032Z (OR 14312).

       A NSSC-1 Status Buffer was dumped at 045/2134Z (ROP NS-3).

       The SSR EDAC Counter was cleared seven times (ROP SR-1).

       The Gyro #3 drift rate has shown no improvement.  The rate of change
is 36.36 arcseconds/hour/day.  The trend still exceeds the desired limit of
10.8 arcseconds/hour/day prior to Gyro #3 reinstallation into the control
loop.

       Gyro #1 Saturation Safing Flag was out of limits (OOL) for one
sample (12 Seconds) at the end of a slew at 045/1033Z. HSTAR 6996 was
written  See Item 1.20 (Proposal 7505).

       There was a Guide Star Acquisition which resulted in a Fine Lock
Backup at 045/1423Z due to a FGS #1 SSLE. The subsequent reacquisiton
(1,3,1) resulted in Fine Lock Backup, Fine Lock was achieved using the same
primary FGS #1 (1,0,1).
HSTART 6997 was written.  (See ites 1.5 and 1.9 (Proposals 7475 and 8091)).

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH