HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2064

PERIOD COVERED:  0000Z (UTC) 02/19/98 - 0000Z (UTC) 02/20/98

Daily Status Report as of 051/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7926 (CCD Dark and Bias Monitor -- Continued)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
several dark and bias calibration observations.  This is 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.  These observations will also 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 7625 (WF/PC-2 Cycle 7 Earth Flats)

       The WF/PC-2 was used to make a series of Earth flat calibration
images.  These flat fields will allow mapping of the OTA illumination
pattern and will be used in conjunction with previous internal and external
flats to generate new pipeline superflats.  The observations were completed
as planned, and no anomalies were reported.

   1.3 Completed Two Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This set of calibrations is intended to obtain three dark frames every day
to provide data for monitoring and characterizing the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.4 Completed STIS/CCD 7803 (Daily Darks to Update Acquisition Bad Pixel
Table Part III)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
daily dark calibration updates.  These daily darks are intended to identify
hot pixels for update to the acquisition on-board FSW hot pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were completed as planned, and no anomalies were reported.

   1.5 Completed WF/PC-2 6642 (White Dwarf Companions to Binary Neutron
Stars, Astrometric Frame Ties)

       The WF/PC-2 was used to make observations of the white dwarf star
STAR-1857 in order to make comparisons of white dwarf star to its binary
neutron star companion. The main intent is to improve the correspondence
between the optical and radio coordinate systems.  The observations were
executed as scheduled, and no anomalies were noted.

   1.6 Completed Six Sets of STIS/CCD 7908 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  During the fifth iteration of this
proposal, the acquisition default described in 2.1 occurred.  Otherwise,
the observations were completed as planned, and no further problems were
reported.

   1.7 Completed WF/PC-2 7387 (T-Tauri Star Snapshot Survey)

       The WF/PC-2 was used to make observations of the star LKCA-7 as part
of a T-Tauri class star survey.  The observations were executed as
scheduled, and no anomalies were noted.

   1.8 Completed NIC/2 7834 (A Search for Giant Planets Around Very Young
Nearby Late-type Dwarfs)

       The Near Infrared Camera (Camera Two) was used to make observations
of the very young, late-type, dwarf star GJ182 as part of a search for
large planets.  Very young late-type dwarfs at distances closer than 30 pc
are excellent sites to provide a direct detection of extrasolar planets.
The observations were executed as scheduled, and no anomalies were noted.

   1.9 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.

   1.10 Completed WF/PC-2 7336 (Cosmological Parameters Omega and Lambda
>From High-Redshift Type Ia Supernovae)

       The WF/PC-2 was used to make observations of the high redshifted
Type Ia supernova SN2-5H-Z0.  HST can make a direct measurement of the
cosmological parameters, Omega, Lambda, and curvature, using Type Ia
supernovae as calibrated "standard candles."  The observations were
executed as scheduled, and no anomalies were noted.

   1.11 Completed Four 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.  During the fourth iteration of this proposal, the
acquisition default described in 2.1 occurred.  Otherwise, the observations
were completed as planned, and no further anomalies were reported.

   1.12 Completed STIS/CCD 7674 (IR Standards)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard star HZ4 in order to establish a set of absolute
flux standards on the WD scale that extend the existing wavelength coverage
to 10300A with the STIS G750L grating setting.  The proposal completed with
no reported problems.

   1.13 Completed STIS/CCD 7313 (Systematic Investigation of Comet Hale-Bopp)

       The Space Telescope Imaging Spectrograph (CCD) was used in the
continued systematic investigation of Comet Hale-Bopp}.  Emissions from OH,
CS, and the CO Cameron system were monitored, which allows comparison with
the heliocentric variation in the production rates of water, CS2, and CO2
(or possibly CO, if electron impact on CO dominates the excitation of the
Cameron bands).  There were two losses of lock in this proposal which
lasted approximately six hours.  The first occurred at 050/143934Z (about
four hours into the proposal and lasting for four seconds); the second
occurred at 050/162030Z (near the end of the proposal).  A total of five
observations were affected.  HSTARs 6348 and 6349 were written).
Otherwise, the observations were executed as scheduled, and no further
problems were reported.

   1.14 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

       The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements.  A variety of internal exposures are obtained in
order to provide a monitor of the integrity of the CCD camera electronics
in both bays {gain 7 and gain 15}, a test for quantum efficiency in the
CCDs, and a monitor for possible buildup of contaminants on the CCD
windows.  A bias calibration and an internal flat calibration image were
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.15 Completed Two 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 SN1998C1 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.  During the first
iteration of this proposal, the acquisition default described in 2.1
occurred.  Otherwise, the observations were completed as planned, and no
further anomalies were reported.

   1.16 Completed 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 MC1635+119 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.

   1.17 Completed WF/PC-2 7476 (Sakurai's Nova-Like Object: Real-Time
Monitoring of a Stellar Thermal Pulse)

       The WF/PC-2 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 10
                                        Successful : 10
                          Scheduled Reacquisitions : 5
                                        Successful : 5

       Per HSTARs 6348 and 6349, there were two losses of lock.  The
proposal described in 1.13 was affected in each case.  Please see that
section for details.

       The acquisition at 050/190913Z failed to fine lock on FGS-3 only
when FGS-1 had its scan step limit exceeded.  HSTAR 6350 was written.  The
proposals detailed in 1.6, 1.11, and 1.13 may have been affected.

   2.2 FHST Updates:

                              Scheduled : 21
                             Successful : 21

   2.3 Operations Notes:

       Aside from the acquisition difficulties mentioned above, there were
no other significant problems reported.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH