HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2271

PERIOD COVERED:  0000Z (UTC) 12/15/98 - 0000Z (UTC) 12/16/98

Daily Status Report as of 350/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed 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 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 Sgr-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.

   1.3 Completed Four Sets of NIC/1/2/3 8083 (FLATs: Warming Up - continuation)

       The Near Infrared Camera (Cameras One, Two and Three) was to be used
to monitor the flat fields during the interval between the end of science
observations and the exhaustion of cryogen and subsequent warming of the
dewar to > 100K.  Due to the NICMOS suspend event that occurred on day 348,
this proposal did not execute.

   1.4 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.

   1.5 Completed Three Sets of WF/PC-2 7377 (Dwarf Elliptical Galaxy
Snapshot Survey II)

       The WF/PC-2 was used to make observations of the dwarf elliptical
galaxies FCC212, VCC646 and DGC78 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.

   1.6 Completed 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.

   1.7 Completed Eleven Sets of NIC/1/2/3 7963 (Darks: Warming Up)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
monitor the detector dark current during the interval between the end of
science observations and the exhaustion of cryogen and subsequent warming
of the dewar to > 100K.  Due to the NICMOS suspend event that occurred on
day 348, all but the final iteration of this proposal, which completed with
no reported errors, did not execute.


   1.8 Completed Three Sets of WF/PC-2 6751 (Is the Central Star of K 648
in M15 a Close Binary?)

       The WF/PC-2 was used to make observations of the central star of the
planetary nebula K648 which is located in globular cluster M-15 to
determine if this star is a binary star.  Pre-repair HST images reveal that
the nebula is strongly elliptical in shape, and shows blobs on either side
of the central star.  The observations were executed as scheduled, and no
anomalies were noted.

   1.9 Completed Seven Sets of STIS/CCD 8062 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations.  The observations were completed as planned, and no problems
were reported.

   1.10 Completed WF/PC-2 7358 (The Unusual Absorption Line System of
PG2302+029 -- Ejected or Intervening?)

       The WF/PC-2 was used to make observations of the unusual absorption
line systems PG2302+029 to help to identify the cause of this absorption
system and allow us to determine whether the system is an extreme example
of previously known classes of quasar absorption lines or represents an
entirely new phenomenon.  The observations were completed as scheduled, and
no anomalies were reported.

   1.11 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 NGC-5077 (taken form a list of 150 galaxies) in order to
study its nuclear morphology. This survey will complement Illingworth's
snapshot study of later Hubble types.  The observations were completed as
scheduled, and no anomalies were reported.

   1.12 Completed FGS 7678 (Monitor the Long-Term Stability of FGS-1R)

       The goal of these measurements is to monitor the internal positional
stability of the FGSs by measuring many stars in the M35 check field
repeatedly over a one year period. The results of these measurements are
the stability characteristics of the FGS to allow an estimate of
differential corrections to OFAD and Plate Scale.  The observations were
completed as planned, and no problems were reported.

   1.13 Completed STIS/MA2 7657 (STIS Spectroscopic and Imaging
Sensitivity, MAMA)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
observations of the star BD+75D325 in order to study the spectroscopic and
imaging sensitivity.  Sensitivity measurements are done for all primary
tilts of the gratings and the prism used with the MAMAs, except for the
G140L and G230L gratings.  Imaging sensitivity measurements are done with
all apertures, including a neutral density filter.  A wavelength and a dark
calibration image were also taken.  The observations were executed as
scheduled, and no anomalies were noted.

   1.14 Completed WF/PC-2 6347 (A Search for Jets in Planetary Nebulae)

       The WF/PC-2 was used to make observations of the planetary nebulae
(class PNe) PK242-11D1 in order to search for the presence of possible
narrow jets.  The current model for PNe formation indicates that jets are
an unexpected phenomena, yet there is a growing body of circumstantial
evidence that suggests narrow jets are common feature in PNe.  The
observations were completed as scheduled, and no anomalies were noted.

   1.15 Completed Five 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 Low galactic latitude observations as part of POMS
test proposal.  The observations were executed as scheduled, and no
anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 15
                                        Successful : 15

                          Scheduled Reacquisitions : 2
                                        Successful : 2

   2.2 FHST Updates:

                              Scheduled : 34
                             Successful : 31

       As documented in HSTAR 6817, the full maneuver updates at
349/195249Z and 349/195534Z failed.  The following acquisition was
successful in spite of a tracker update failure immediately prior.  A map
taken after the acquisition showed small errors.

   2.3 Operations Notes:

       The NICMOS instrument began the day in a suspend state.  A meeting
held early Tuesday morning found no indications of a hardware failure.
Memory dump analysis showed no apparent problems.  Consensus was to recover
the instrument as soon as practical.  Accordingly, RTCS 25 was managed at
the 349/1929Z, and the NICMOS was recovered from suspend via direction from
an operations request.  The instrument is now operating nominally.  The
proposals detailed in 1.3 and 1.7 were affected by the suspend.

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

       The STIS MAMA-1 MCE reset at 349/184854Z during an SAA event and
while the low voltage was on.  Per ROP NS-12, the STIS error counter was
reset at 349/1900Z.  The MCE was recovered at 350/080648Z, the time of a
MAMA turn-on, via SMS commanding.  HSTAR 6816 was written.

       There was a NICMOS EDAC single bit error at 350/083655Z.  HSTAR 6818
was written, and the ground system limit was adjusted.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH