HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2237

PERIOD COVERED:  0000Z (UTC) 10/26/98 - 0000Z (UTC) 10/27/98

Daily Status Report as of 300/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 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.

   1.3 Completed Two Sets of WF/PC-2 7590 (Cosmological Parameters Omega
and Lambda From High-Redshift Type IA Supernovae)

       The WF/PC-2 was used to make observations of type 1A supernova
5H1.3ZA and 23H1.3ZA in order to study its redshift.  The HST was used to
make direct measurements of the cosmological parameters Omega, Lambda, and
curvature using Type 1A supernovae as a calibrated "standard candle".  The
observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed Eight 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.  The observations were completed as planned, and no
anomalies were noted.

   1.5 Completed Five Sets of STIS/CCD 8084 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation II)

       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.

   1.6 Completed Six 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.

   1.7 Completed NIC/1/2 7329 (The Nature of the Damped LyAlpha Absorbers
-- A New Study of Young Galaxies)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the young galaxy Q0102-0214 in order to study the nature of
its damped Lyman-Alpha Absorbers (DLAs).  The DLA line systems,
occasionally found in quasar spectra, provide one of only a few practical
methods of detecting and studying significant numbers of galaxies at high
redshifts.  The observations were executed as scheduled, and no anomalies
were noted.

   1.8 Completed STIS/MA2 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) 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.

   1.9 Completed NIC/2 7894 (Completing A Near-Infrared Search for Very Low
Mass Companions to Stars within 10 pc)

       The Near Infrared Camera (Camera Two) was used to make observations
searching for very low mass (VLM) companions to the star LHS445.  This
search will be the largest, most sensitive, volume-limited search for VLM
companions ever undertaken.  The observations were completed as planned,
and no anomalies were reported.

   1.10 Completed STIS/CCD/MA1/MA2 7434 (The Supernova Intensive Study)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to continue the long-term project on supernovae by observing SN1998S.  HST
can make unique contributions to understanding supernovae, as has been
demonstrated through this program in past years, and now STIS and NICMOS
offer new opportunities for deepening this investigation.  The aim of the
proposal is to explore the UV emission from supernovae, exploit the spatial
resolution of HST and press the late-time observations of supernovae into
uncharted territory.  The observations were completed as planned, and no
anomalies were reported.

   1.11 Completed Three Sets of NIC/2/3 8082 (NICMOS pure parallel Fall 98)

       The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel observations while another instrument is prime.  The
observations were executed as scheduled, and no anomalies were noted.

   1.12 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.

   1.13 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.

   1.14 Completed STIS/CCD 8080 (STIS Spectroscopic CCD Flatfielding --
Revised)

       The Space Telescope Imaging Spectrograph (CCD) was used to make CCD
flat fielding calibration observations in the spectroscopic mode.  The
observations were completed as planned, and no anomalies were reported.

   1.15 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 HD29225 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 wavelenth calibration obseration was also taken.
The observations were completed as planned, and no porblems were reported.

   1.16 Completed FGS 7677 (Monitor the Long Term Stability of FGS-3)

       The goal of these measurements is to monitor the internal positional
stability of FGS3 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 FGS3 which allow an estimate of differential
corrections to OFAD and plate scale.  The measurements were completed as
scheduled. with no reported anomalies.

   1.17 Completed WF/PC-2 6659 (A Search For Superplanets Around Weak T-
Tauri Stars)

       The WF/PC-2 was used to make observations in the 1 micron band of
the T-Tauri class star HBC426 in order to search for superplanets.  Weak
T-Tauri class stars are thought to have dissipated their circumstellar
disks recently, possibly by forming planetary systems.  The observations
were completed as planned, and no anomalies were reported.

   1.18 Completed WF/PC-2 7376 (Understanding Halo Microlensing and
Variable Stars in M31: 1} Snapshot Survey of Candidates)

       The WF/PC-2 was used to make observations of the galaxy M-31-Lens
system #4 to help understand its halo microlensing and Variable Stars.  Six
microlensing candidates affecting stars in M31 and presumably due to
sub-solar-mass MACHOs are being studied.  Simultaneously we can explored
the stellar population in the relatively unexplored disk/bulge transition
via its variable stars, luminosity function and color-magnitude diagram.
The observations were executed as scheduled, and no anomalies were
reported.

   1.19 Completed NIC/1 7892 (Narrow-band Imaging of BAL QSOs)

       The Near Infrared Camera (Camera One) was used to make narrow band
observations of the BL-Lac (BAL) Q2154-2005.  The detection of extended
emission-line gas structures in BAL QSOs would offer another means of
investigating the BAL QSO phenomenon as well as establishing a new probe of
material in galaxies at high redshift.  The observations were completed as
planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 7

       The acquisition at 300/041259Z failed when the scan step limit was
exceeded, indicating a likely walkdown failure.  HSTAR 6740 was written.
One proposal, to be detailed in tomorrow's report, was affected: NICMOS
7894.

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 18
                             Successful : 18

   2.3 Operations Notes:

       The DF-224 vehicle clock rollover (to the 32nd most significant bit)
occurred yesterday at approximately 299/204215Z.  The event was nearly
nominal, with only the Thermal Management System software being affected.
That software is expected to be brought back on-line today.

       The SSR EDAC error counter was cleared once per ROP SR-1.


3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH