HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2105

PERIOD COVERED:  0000Z (UTC) 04/17/98 - 0000Z (UTC) 04/20/98

Daily Status Report as of 110/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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 V4171-Sgr 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.

   1.2 Completed Three Sets of 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.

   1.3 Completed Eight 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.  The observations were executed as scheduled, and no
anomalies were noted.

   1.4 Completed Three Sets of 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.

   1.5 Completed NIC/3 7901 (NICMOS Post-Campaign Focus
Monitoring)

       The Near Infrared Camera (Camera Three) was used to make some
post-campaign focus monitoring observations by using star cluster NGC-3603.
This proposal is used to determine and monitor the optimal focus and tilt
settings for all three NICMOS cameras after the first NIC/3 observing
campaign.  The observations were executed as scheduled, and no anomalies
were noted.

   1.6 Completed Five 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 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.

   1.8 Completed STIS/CCD 7911 (STIS Galactic Plane Pure Parallel Program)

       The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude survey observations in parallel with the prime science
observations.  Short exposures with the 50CCD imaging mode will provide the
wavelength zero-point calibration.  These data will be placed immediately
into the Hubble Data Archive.  The observations were executed as scheduled,
and no anomalies were noted.

   1.9 Completed Four Sets of NIC/1/2/3 7850 (Cosmological Parameters Omega
and Lambda from High-Z Type Ia Supernovae)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of high Z type Ia Super Nova SN97226 in order to measure
the Omega and Lambda parameters.  Type Ia supernovae can be used as
calibrated standard candles to measure large distances.  The observations
were completed as planned, and no anomalies were reported.

   1.10 Completed Fourteen 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.  As described in HSTAR 6442 and 2.1
below, the acquisition for the ninth iteration of this parallel proposal
failed when the search radius limit flags on both FGS 1 &3 were exceeded.
The take data flag remained down.  Otherwise, the observations were
completed as planned, and no further problems were reported.

   1.11 Completed STIS/MA2 7647 (STIS NUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
near-ultraviolet (NUV) flat calibration images.  This program will obtain
NUV-MAMA flat-field observations with the D2 lamp for the construction of
on-orbit D-flats for G230M.  A dark calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.12 Completed STIS//MA1/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to
make MAMA dark measurements.  These darks will be used in later image
reductions and also trended over the instrument's life time as an indicator
of the detector's degradation or damage.  The observations were completed
as scheduled, and no problems were reported.

   1.13 Completed STIS/MA1 7434 (The Supernova Intensive Study)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
continue the long-term project on supernovae by observing SN1993J.  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.

   1.14 Completed NIC/3 7499 (NICMOS Extragalactic Parallel Grism Survey)

       The Near Infrared Camera (Camera Three) was used to make
observations as part of an extragalactic parallel Grism Survey.  This
proposal is a parallel program using NICMOS's unique capabilities for
slitless spectroscopy in the near IR.  The observations were completed as
planned, and no anomalies were reported.

   1.15 Completed Thirteen 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.

   1.16 Completed WF/PC-2 7409 (Resolving sdB Binary Systems)

       The WF/PC-2 was used to make observations to try and resolve the sdB
class binary system STAR-04330.  This is a continuation of the approved
Cycle 6 Proposal No. 6351, which due to unlucky circumstances did not
succeed in obtaining any data until 8/30/96.  The observations were
completed as scheduled, and no anomalies were reported.

   1.17 Completed Two Sets of NIC/1/2 7227 (A Search for Low
Mass/Sub-Luminous Companions to M-Stars)

       The Near Infrared Camera (Cameras One and Two) was used to make a
search for low mass/sub-luminous companions to low mass M class star GL729.
Knowledge of stellar and sub-stellar masses and luminosities at and below
the ~0.08 M{sun} H-burning limit is of fundamental importance.  A dark
calibration image was also taken.  The observations were completed as
planned, and no problems were reported.

   1.18 Completed NIC/1/2/3 7832 (The Age of Inner Bulge Globular Clusters)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the globular cluster NGC-6528 which is located in the
Milky Way's central bulge.  Until recently very little was known about the
age the globular clusters of the galactic bulge, as a combination of
crowding, differential reddening, and distance made turnoff photometry
beyond the reach of ground based observations.  The observations were
completed as planned, and no problems were reported.

   1.19 Completed STIS/CCD 7672 (STIS CCD Sensitivity Monitor)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard star AKG+81D226 in order to monitor the
sensitivity of each CCD grating mode to detect any change due to
contamination or other causes.  A wavelength calibration image was also
taken.  The observations were completed as scheduled, and no anomalies were
noted.

   1.20 Completed Two Sets of NIC/2 7960 (NICMOS Persistence Test)

       The Near Infrared Camera (Camera Two) was used to conduct a
persistence test.  The goal of these tests is to determine whether multiple
reads hasten the reduction of image persistence from infrared photons and
cosmic rays.  The observations were completed as planned, and no anomalies
were reported.

   1.21 Completed NIC/1 7873 (NICMOS Observations of Potential JVAS/CLASS
Gravitational Lenses)

       The Near Infrared Camera (Camera One) was used to make observations
of the potential gravitational lens system J0831+5225.  The JVAS/CLASS
surveys have been the most successful to date at finding arcsecond-scale
gravitational lenses, almost doubling the known number {11 lenses found of
which 10 are new discoveries}.  The observations were executed as
scheduled, and no anomalies were noted.

   1.22 Completed Four Sets of 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 supernovae 14H0.5Z1, 14H0.5Z2, 11H0.5Z1 and 11H0.5Z2.  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.

   1.23 Completed Eight 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.  As described in HSTAR 6442 and 2.1 below, the
acquisition for the fourth iteration of this parallel proposal failed when
the search radius limit flags on both FGS 1 &3 were exceeded.  The take
data flag remained down.  Otherwise, the observations were completed as
planned, and no further anomalies were reported.

   1.24 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 supernovae
14H0.9Z1 and 14H0.9Z2 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.

   1.25 Completed Two Sets of NIC/1/2/3 7891 (The Initial Mass Function of
the Galactic Bulge)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of NGC-6558 to measure the complete galactic bulge
luminosity function.  This offers a unique clue to better understanding the
complete stellar content, and hence the stellar mass-to-light ratio, of
spiral bulges and by extension of ellipticals as well.  The observations
were executed as scheduled, and no anomalies were noted.

   1.26 Completed NIC/1 7855 (The Evolution of Powerful Radio Galaxies)

       The Near Infrared Camera (Camera One) was used to make observations
of the powerful radio galaxy 8C2342+821.  Our proposed NICMOS observations
combined with our multi-wavelength observing program will finally provide
us with the data we need to build a picture of how powerful radio galaxies
evolve.  The observations were completed as planned, and no porblems were
reported.

   1.27 Completed WF/PC-2 7470 (A Snapshot Survey of Galactic Globular
Clusters)

       The WF/PC-2 was used to make snap shot survey observations of the
crowded center of the galactic globular cluster NGC-6356.  The resulting
color-magnitude diagram will include all stars down to about one magnitude
below the main-sequence turnoff.  The observations were completed as
scheduled, and no problems were reported.

   1.28 Completed WF/PC-2 6887 (A Photometric Search for Faint Companions
to Nearby Stars)

       The WF/PC-2 was used to be used to make photometric search
observations of the nearby star HD209100 in order to look for possible
companions.  The technique involves use of the Planetary Camera with wide
band pass filters to photometrically measure for the presence of resolved
dark companions.  As described in HSTAR 6442 and 2.1 below, the acquisition
for this proposal failed when the search radius limit flags on both FGS 1
&3 were exceeded.  The take data flag remained down.

   1.29 Completed FGS 7493 (Calibrating the Mass-Luminosity Relation at the
End of the Main Sequence)

       The FGSs were used to make observations of star GL234 in order to
make calibration observations of the mass-luninocity relation at the end of
the main sequence.  The study utilizes HST-FGS and infrared speckle imaging
to calibrate the mass-luminosity relation for stars less massive than 0.2
Msun, with special emphasis on objects near the stellar/brown dwarf border.
The observations were completed as scheduled, and no problems were noted.

   1.30 Completed NIC/1/2 7285 (Collimation of Astrophysical Jets: The
Proto-Planetary Nebula He 3-1475)

       The WF/PC-2 was used to make observations of proto-planetary nebula
WR154 in order to get a collimation of its astrophysical jets.  Recent
observations of this proto-planetary nebula in the N II Lambda 6584 A0 line
with the HST WF/PC-2 have revealed what appear the be large scale flows
being collimated into narrow bipolar jets.  The observations were completed
as scheduled, and no anomalies were reported.

   1.31 Completed STIS/CCD 7645 (STIS FUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spaectrograph (CCD) was used to make
far-ultraviolet flat calibration images.   This program will obtain
FUV-MAMA flat-field observations with the Kr lamp for the construction of
on-orbit D-flats for G140M.  A darkcalibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 32
                                        Successful : 32

       The acquisition scheduled for 109/022423Z failed when the search
radius flags on both FGS 1 & 3 were exceeded.  HSTAR 6442 was written.  The
proposals described in 1.10, 1.23, and 1.28 were affected.

                          Scheduled Reacquisitions : 12
                                        Successful : 12

   2.2 FHST Updates:

                              Scheduled : 53
                             Successful : 53

   2.3 Operations Notes:

       Using ROP SR-01, the  SSR correctable EDAC errors were cleared seven
times.

       The SSR was configured to record 32k engineering data two times per
ROP SR-04.

       The STIS MAMA-2 MCE reset at 108/194940Z while in low voltage and
outside an SAA contour.  HSTAR 6440 was written.  STIS science operations
were not affected.  The STIS flight software error counter was reset at
108/2025Z per ROP NS-12, and using ROP DF-01 a full DF-224 memory dump was
performed.  At the time of the next MAMA-2 high voltage on (110/055232Z)
the MCE will be properly configured.

       The ground system limit for the gyro 1 motor current was changed at
109/1927Z as directed by an operations note.

       The LGA transmitters were configured for support, and then the HGA
was configured for support on day 109 via an operations request.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH