HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2163

PERIOD COVERED:  0000Z (UTC) 07/10/98 - 0000Z (UTC) 07/13/98

Daily Status Report as of 194/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Five 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 Seven Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  This dark calibration program obtains three dark frames
every day to provide data for monitoring and characterizing the evolution
of hot pixels.  As described in 2.1 and in HSTAR 6580, during the fourth
iteration of this proposal, the guide star acquisition failed to gyro
control at 192/015955Z, and the take data flag went down for three
observations.  Otherwise, the observations were executed as scheduled, and
no further anomalies were noted.

   1.3 Completed Two Sets of NIC/1/2 7852 (Weighing the Stellar Halo of NGC
5907 with NICMOS)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the staler halo around NGC-5907 in order to determine its
composition.  This stellar halo has a radial profile that roughly traces
the isothermal profile required to reproduce the rotation curve.  As
described in 2.1 and in HSTAR 6580, during the second iteration of this
proposal, the guide acquisition failed to gyro control at 192/015955Z, and
the take data flag went down for two observations.  Subsequent
reacquisitions during this proposal were successful.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.4 Completed Eleven 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.

   1.5 Completed Two Sets of 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.  As described in 2.1 and in HSTAR 6580, during the second
iteration of this proposal, the guide acquisition failed to gyro control at
192/015955Z, and the take data flag went down for two observations.
Subsequent reacquisitions during this proposal were successful.  Otherwise,
the observations were completed as scheduled, and no further problems were
reported.

   1.6 Completed Two Sets of NIC/1/2/3 7896 (A NIR Snapshot Survey of
Ultraluminous IR Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make snapshot survey observations of the ultraluminous infrared galaxies
QDOTULIR18 and QDOTULIR13.  Nearly all of these galaxies show evidence for
a recent tidal interaction, and we will search for evidence of the merger
progenitors near the center of each galaxy, a task made significantly
easier with NIR imaging.  The observations were completed as planned, and
no anomalies were noted.

   1.7 Completed Three Sets of STIS/CCD/MA1 7288 (High Resolution
Ultraviolet Spectroscopy of Hercules X-1/HZ Herculis)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make ultraviolet spectrographic observations of the X-ray binary pulsar
4U1656+35 (a.k.a., Hercules X-1/HZ Herculis).  A wave length calibration
observations was also taken.  At the beginning of the second iteration of
this proposal, the MCE-1 reset described in HSTAR 6582 and in 2.3 occurred,
and ten STIS images were lost.  Otherwise, the observations were executed
as scheduled, and no further anomalies were noted.

   1.8 Completed NIC/1/2 7821 (SINS: The Supernova Intensive Study - Cycle
7+: Scarlet SINS)

       The Near Infrared Camera (Camera One and Two) was used to make
observations of the super nova LMC-SN1987 which is located in the Large
Magellanic Cloud.  Supernovae create the chemical history of the Universe,
energize the interstellar gas, and stand at the center of efforts to
understand the extragalactic distance scale.  The observations were
completed as scheduled, and no problems were noted.

   1.9 Completed STIS/CCD 7476 (Sakurai's Nova-Like Object: Real-Time
Monitoring of a Stellar Thermal Pulse)

       The Space Telescope Imaging Spectragraph (CCD) was used to make
images of Sakurai's nova-like object in order to do real-time monitoring of
a stellar thermal pulse.  The eruption of Sakurai's nova-like variable in
Sagittarius presents a "once-in-a-lifetime" opportunity for real-time
observations of a star undergoing a final helium thermal pulse.  The
observations were completed as planned, and no anomalies were reported.

   1.10 Completed Two Sets of NIC/2 7226 (Search for Massive Jupiters)

       The Near Infrared Camera (Camera Two) was used to make a corographic
search for massive planets around nearby, young main sequence stars.
Because of the extreme youth of these objects, any low-mass brown dwarf and
planetary companions will still be in a higher luminosity phase and thus
easily detectable.  A dark calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.11 Completed Nine Sets of NIC/2/3 7907 (NICMOS Pure Parallel Winter 97-98)

       The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel spectrographic observations of sky regions when another
instrument is prime.  The observations were completed as planned, and no
anomalies were reported.

   1.12 Completed NIC/2 7892 (Narrow-band Imaging of BAL QSOs)

       The Near Infrared Camera (Camera Two) was used to make narrow band
observations of the BL-Lac (BAL) QSO Q1439+0047.  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.

   1.13 Completed Two Sets of WF/PC-2 6776 (A Comparative HST Imaging Study
of Radio Galaxies and Hosts)

       A clear understanding of the nature of the host galaxies of
radio-quiet quasars, radio-loud quasars and radio galaxies is of central
importance in any attempt to unify and relate the three main classes of
powerful active galaxies.  Existing HST studies of quasar hosts, whilst
producing many interesting new results, have yielded surprisingly little
hard information on the properties of the hosts themselves.  This imaging
study of galaxy 3C79 using the WF/PC-2 will remedy this situation by
undertaking redder, line-free observations of our three matched AGN
samples.  The proposal completed with no reported problems.

   1.14 Completed NIC/2/3 7453 (The SBF Hubble Diagram)

       The Near Infrared Camera (Camera Two and Three) was used to make
deep NICMOS observations of galactic cluster Abell-3565 to determine its
distance using the surface brightness fluctuation {SBF} method.  HST is
essential for its high spatial resolution which makes it possible to detect
and remove globular clusters and background galaxies that contaminate the
SBF measurement.  The observations were executed as scheduled, and no
anomalies were noted.

   1.15 Completed WF/PC-2 6837 (The Ultraviolet Properties of "Dwarf"
Seyfert 1 Nuclei)

       The WF/PC-2 was used to make ultraviolet observations of the
"dwarf", type one, Seyfert galaxy NGC-4501.  This class of "dwarf" Seyfert
populate the faint end of the local AGN luminosity function and hold
important clues to the evolution of the entire AGN population.  The
observations were completed as scheduled, and no problems were reported.

   1.16 Completed WF/PC-2 7385 (Low-Mass Halo Binaries)

       The WF/PC-2 was used to make observations of the low mass, halo,
binary, {Population II}, M-type, sub-dwarf, star LHS364.  This star is too
faint to be resolved through ground-based speckle interferometry, thus HST
represents the only means of probing separations.  The observations were
completed as planned, and no anomalies were reported.

   1.17 Completed WF/PC-2/STIS/CCD/NIC/1/2/3 7307 (The Formation and
Evolution of Rich Star Clusters in the LMC)

       The WF/PC-2, the Space Telescope Imaging Spectrograph (CCD), and the
Near Infrared Camera (Cameras One, Two and Three) were used to make
observations of the rich star cluster NGC-1818 which is located within the
Large Magellanic Cloud in order to study its formation and evolution.
These observations will help us understand the origin and evolution of rich
star clusters in our own galaxy.  The observations were completed as
scheduled, and no anomalies were reported.

   1.18 Completed NIC/1/2/3 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-4536 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.

   1.19 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.

   1.20 Completed NIC/1/2 7861 (A Search for Extrasolar Giant Planets in
the Nearby TW Hya Association)

       The Near Infrared Camera (Cameras One and Two) was used to search
for extrasolar giant planets on the nearby star CD-337795 (a.k.a., TW Hya).
One of the primary goals of NASA's mission is the identification of formed
and nascent planetary systems.  The observations were executed as
scheduled, and no anomalies were noted.

   1.21 Completed FGS 7679 (Intermediate Plate Scale Calibration (FGS-3))

       The Fine Guidance Sensors (FGS-3)was used to make observations of
star HD65949 and several other reference stars in order to completed an
intermediate plate scale calibration.  The essential point of this
calibration is to refine our knowledge of the plate scale in the central
region of the astrometer FGS for this is where all annual parallax work
will be executed by the GOs and GTOs.  The observations were executed as
scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 26
                                        Successful : 25

       HSTAR 6580 documents a guide star acquisition failure to gyro
control at 192/015955Z when the coarse angle check failed.  The attitude
was good.  Subsequent re-acquisitions were completely successful.  The
proposals described in 1.2, 1.3, and 1.5 were affected.

                          Scheduled Reacquisitions : 23
                                        Successful : 23

   2.2 FHST Updates:

                              Scheduled : 46
                             Successful : 46

   2.3 Operations Notes:

       Using ROP SR-1, the SSR EDAC error counter was reset ten times.

       Per ROP SR-3, the SSR SCI pointer was reset to recover science data
for the DCF at 191/1751Z.

       ESTR-2 reconditioning was performed starting at 191/1943 per
operations request and ROP RD-7.

       A TTR was written for a 15-minute loss of forward service at
192/0042Z due to equipment problems at STGT.  Science operations were not
affected.

       Another TTR was written to document a 35-minute period of
unrecoverable realtime engineering data and a 4-minute, 29-second period of
recoverable realtime data.  This event started at 192/0442Z.

       The STIS MCE-1 reset at 192/133941Z while the MAMA-1 high voltage
was on and while outside an SAA interval.  The proposal described in 1.7
was affected.  The STIS error counter was reset at 192/1437Z via ROP NS-12.
Recovery occurred via the SMS at 193/1201Z, the next scheduled time for the
MAMA-1 high voltage turn on.

       For all three days of the weekend, the DF-224 SPC memory were dumped
to CCS strings A and B.  Both were successful the first day; for the second
day B string was down; and for the third day there were problems on both
strings.  Later, this third day's dump was successful to A string only.

       At 193/0716Z, a full DF-224 memory dump was successfully performed,
sending data to the operational string and to CCS string A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH