HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2238

PERIOD COVERED:  0000Z (UTC) 10/27/98 - 0000Z (UTC) 10/28/98

Daily Status Report as of 301/0000Z

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 Two 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.

   1.3 Completed Four 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.  As described in 2.1 and HSTAR 6741, the
acquisition for the final iteration of this proposal failed and the take
data flag remained down, affecting three observations.  Otherwise, the
observations were completed as planned, and no further anomalies were
noted.

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

       The Near Infrared Camera (Camera Two) was used to make observations
of the young galaxy Q0010-0012 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.

   1.5 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 to be used to make
observations searching for very low mass (VLM) companions to the star
BD+05D3409.  This search will be the largest, most sensitive,
volume-limited search for VLM companions ever undertaken.  As described in
yesterday's report and in HSTAR 6740, the acquisition for this proposal
failed and the take data flag remained down.

   1.6 Completed WF/PC-2/NIC/3 7563 (Francis Cluster)

       The WF/PC-2 and the Near Infrared Camera (Camera Three) was used to
make observations of the cluster Gal-Clus-2 (a.k.a., Francis Cluster) using
various modes.  A wavelength calibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.

   1.7 Completed Two Sets of STIS/MA1 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) 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.

   1.8 Completed NIC/1 7180 (Surface and Atmospheric Features on Titan)

       The Near Infrared Camera (Camera One) was used to make high
resolution infrared observations of the surface and atmospheric features on
Saturn's moon Titan.  The primary objective is to measure the wavelength
dependence of discrete surface features to investigate possible
compositional heterogeneity of Titan's surface.  The observations were
executed as scheduled, and no anomalies were noted.

   1.9 Completed NIC/1/2 7849 (Metallicity and the Cepheid Distance Scale)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of Cepheid variable stars in the NGC-3198 galaxy.  The
local distance scale to galaxies is largely based on the Cepheid
period-luminosity relation.  Motivated by the goal of measuring an accurate
value of the Hubble constant, HST has been used successfully to discover
scores of Cepheid variables in each of about 20 galaxies.  The observations
were executed as scheduled, and no anomalies were noted.

   1.10 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies.  This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies.  These data will be placed immediately into the Hubble Data
Archive.  The observations were completed as scheduled, and no problems
were reported.

   1.11 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.

   1.12 Completed Two 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.  As described in 2.1 and HSTAR 6741, the acquisition for the
second iteration of this proposal failed and the take data flag remained
down, affecting two observations.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.13 Completed WF/PC-2 6438 (Dust Structure in Backlit Galaxies)

       The WF/PC-2 was to be used to make observations of the Backlit
Galaxy NGC-3314 in order to study its dust structure.  This effect is
produced by a pair of overlapping galaxies which offer an unusually direct
way to measure the extinction within the disk of spiral galaxies.  As
described in 2.1 and HSTAR 6741, the acquisition for this proposal failed
and the take data flag remained down, affecting eight observations.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 9
                                        Successful : 8
                          Scheduled Reacquisitions : 10
                                        Successful : 9

       HSTAR 6741 was written to describe failures of an acquisition and a
re-acquisition at 300/223741Z and 301/000914Z respectively.  In each case
the search radius limit was exceeded.  The proposals mentioned in 1.3,
1.12, and 1.13 were affected, as were three proposals occurring during the
period of the next report: STIS 7948, NICMOS 7963, and WF/PC-2 7713.

   2.2 FHST Updates:

                              Scheduled : 19
                             Successful : 19

   2.3 Operations Notes:

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

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH