HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2115

PERIOD COVERED:  0000Z (UTC) 05/01/98 - 0000Z (UTC) 05/04/98

Daily Status Report as of 124/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Six 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.

   1.2 Completed STIS/CCD/MA1/NIC/3/WF/PC-2 7580 (UV Imaging and
Spectroscopy of High Excitation Herbig-Haro Objects)

       The Space Telescope Imaging Spectrograph (CCD/MA1), the Near
Infrared Camera (Camera Three), and the WF/PC-2 were used for far UV
imaging and long-slit spectroscopy to investigate the morphology and
physical conditions in high excitation Herbig-Haro objects.  FUV imaging in
a bandpass containing the CIV emission line will delineate the morphology
of high excitation gas and identify regions suitable for followup
spectroscopy.  Low resolution {G140L} long-slit spectroscopy will identify
and map the various ionic and molecular components of the FUV emission.
Medium resolution {G140M} long-slit spectroscopy will provide maps of the
velocity structure in the CIV emission and will probe the physical
conditions producing fluorescent emission from molecular hydrogen.  The
proposal was completed as scheduled with no reported anomalies.

   1.3 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.

   1.4 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 WF/PC-2 7277 (Calibration of the Cepheid P-L Relation with
Observations of the Maser-Host Galaxy NGC)

       The WF/PC-2 was used to make observations of the maser-host galaxy
NGC-4258 to study its Cepheid variable stars.  These data will help refine
the calibration of the Cepheid period-luminosity relationship.  The
observations were completed as scheduled, and no problems were reported.

   1.6 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.  The observations were completed as planned, and no
anomalies were reported.

   1.7 Completed Ten 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.  The observations were completed as
planned, and no problems were reported.

   1.8 Completed NIC/1/2/3 7505 (The Hubble Diagram for Distant Supernovae
Measuring Cosmic Deceleration and Global Curvature)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of Super Nova SN1998E 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.  The observations were completed as planned, and
no anomalies were reported.

   1.9 Completed Four 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 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
11H0.9Z2 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.

   1.11 Completed FOC/96 6516 (SN-1991T: Reflections of Past Glory)

       The Faint Object Camera was used to make observations of the host
galaxy NGC-4527.  This is to try and resolve a light echo inferred from
ground based measurements. These observations will conclusively demonstrate
(or repudiate) the presence of a light echo around.  The observations were
executed as scheduled, and no anomalies were noted.

   1.12 Completed Two Sets of NIC/2/STIS/CCD/WF/PC-2 7220 (Imaging of
Quasar Host Galaxies)

       The Near Infrared Camera (Camera Two), the Space Telescope Imaging
Spectrograph (CCD), and the WF/PC-2 were used to make direct imaging
observations of the host galaxy for the broad absorption line quasar
QSO0951+69.  The observations were completed as planned, and no anomalies
were reported.

   1.13 Completed Four Sets of NIC/2 7233 (Dust Disks Around Main Sequence
Stars)

       The Near Infrared Camera (Camera Two) was used to make observations
of the dust disk around main sequence stars.  The observations were made
with the coronagraph to minimize the effects of glare from the bright
central star.  A dark calibration image was also taken.  The observations
were completed as scheduled, and no anomalies were reported.

   1.14 Completed Three Sets of WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination)

       The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure.
Ultraviolet-blocking contaminants were removed, and hot pixels cured, by
warming the CCDs to +20C for 6 hours.  A variety of internal images were
taken before and after the decontamination in order to verify its success
and to monitor the instrument health.  The procedures were conducted as
scheduled, and no problems were reported.

   1.15 Completed NIC/1 7232 (NICMOS Spectrophotometry and High Resolution
Imaging of HD 98800)

       The Near Infrared Camera (Camera One) was used to make
spectrophotometry and high resolution imaging of star HD 98800.  This star
system is located nearby at a probable distance of 20 pcs. It is a unique
stellar system consisting of two K7-V stars separated by 0.8 arcsec. A dark
calibration image was also taken.  The observations were executed as
planned, and no problems were encountered.

   1.16 Completed STIS/CCD/MA1/MA2 7436 (A Complete Sample of Hot Post-AGB
Stars in Globular Clusters)

       The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to
make observations of the globular cluster NGC-6723.  Recent observations
with the Ultraviolet Imaging Telescope have provided a complete sample of
the hot post asymptotic giant branch {post-AGB} population in fourteen
globular clusters.  A wavelength calibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.

   1.17 Completed NIC/1/2/3 7690 (NICMOS Pointed Super Flats)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make super flat field calibration observations.  The observations will be
used to build high signal/noise ratio NICMOS flat fields for the different
filters.  The observations were executed as scheduled, and no anomalies
were noted.

   1.18 Completed Two Sets of NIC/1/2/3 7878 (The Stellar Population of
NGC-3379)
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       The Near Infrared Camera (Camera One, Two and Three) was used to
make observations to study the stellar population of the nearest normal
giant elliptical galaxy NGC-3379.  The observations were executed as
scheduled, and no anomalies were noted.

   1.19 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.  The observations were completed as scheduled, and no problems
were reported.

   1.20 Completed NIC/1/2 7858 (The Composition of Kuiper Belt Objects)

       The Near Infrared Camera (Cameras One and Two) was used to
investigate the small bodies recently discovered in the outer solar system
that appear to be unique both in composition and diversity compared to
other classes of solar system objects.  The proposal completed as planned,
and no anomalies were noted.

   1.21 Completed NIC/1/2/3 7840 (Near-IR Imaging and Polarimetry of
Bipolar Proto-Planetary Nebulae)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make near-infrared observations of the bipolar proto-planetary nebula
IRAS16594.  The origin of the rich variety of morphologies observed in
planetary nebulae {PN} is one of the major unsolved problems in stellar
evolution.  The observations were executed as scheduled, and no anomalies
were noted.

   1.22 Completed 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 with no anomalies.

   1.23 Completed WF/PC-2 7623 (WF/PC-2 Cycle 7 Internal Flats)

       The WF/PC-2 was used to make a set of internal Cycle 7 calibration
flats which are designed to monitor the pixel to pixel flat field response
and the visflat lamp degradation, as well as detect any possible changes
due to contamination.  The calibration observations were completed as
planned, and no problems were reported.

   1.24 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-6235.  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.

   1.25 Completed STIS/MA1 7577 (Slitless Spectroscopy of the Nuclear
Starburst of NGC-5236)

       The Space Telescope Imaging Spectrograph (MA1) was used to address
five basic questions about the nature of starbursts: {1} What kind of star
cluster - open cluster or globular cluster - is formed in a starburst? {2}
How is the evolution of a starburst system influenced by metallacity,
especially in the case of a super-solar metallicity? {3} Does the birth and
evolution of one star cluster trigger star formation in its environs? {4}
Is there a physical and/or evolutionary link between a circum-nuclear
starburst and the nucleus? {5} For barred spirals, what is the connection
between a starburst and a spiral bar?  The observations were completed as
planned, and no anomalies were reported.

   1.26 Completed Three 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 with no anomalies.

   1.27 Completed Two Sets of WF/PC-2 7282 (A Continuing Snapshot Survey
for Compact Stellar Groups and Clusters around Wolf-Rayet Stars)

       The WF/PC-2 was used to make observations of the Wolf-Rayet star
WR26 as part of a continuing snapshot survey of compact stellar groups and
clusters.  The newly imaged clusters allow us to accurately determine the
distances, luminosities, and ages of the WR members.  The observations were
executed as scheduled, and no anomalies were noted.

   1.28 Completed Two Sets of 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.

   1.29 Completed WF/PC-2 6845 (51 Pegasi X?)

       The WF/PC-2 was used to observe a recently discovered  companion to
the G dwarf 51 Pegasi, a companion (and possibly another) that is likely to
have a mass comparable to Jupiter's.  This program will obtain images at
two different orientations with the goal of detecting additional low-mass
companions.  The proposal completed as planned, with no problems.

   1.30 Completed NIC/1/2/3 7875 (Searching for Old Stellar Populations in
Candidate Proto-Spheroidals)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations searching for old stellar populations in candidate
proto-spheroid HER1-13925.  We have compelling evidence from WF/PC-2 images
that these galaxies have optical colors gradients.  The near-infrared is
necessary, however, to reveal color gradients large enough to separate
young and old stellar populations.  Only NICMOS imaging provides enough
spatial resolution and depth to resolve these gradients.  The observations
were completed as planned, and no problems were reported.

   1.31 Completed WF/PC-2 7618 (WF/PC-2 Cycle 7 Photometric Monitor UV/OPT STD)

       The WF/PC-2 was used to make observations of the standard star
GRW+70D582 as part of a Cycle 7 photometric monitoring program.  This
ultraviolet spectrophotometric standard star was observed in a variety of
filters and cameras to monitor the photometric stability and quantum
efficiency of WF/PC-2 from the far-ultraviolet to near-infrared.  The
observations were completed as scheduled, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 30
                                        Successful : 30
                          Scheduled Reacquisitions : 18
                                        Successful : 18

   2.2 FHST Updates:

                              Scheduled : 60
                             Successful : 60

   2.3 Operations Notes:

       HSTAR 6457 was written to describe an unrecoverable 11-minute,
2-second engineering data gap that began at 120/204359Z.  Following the RF
Transfer Switch #2 Test, the commands (from ROP SR-1) were not sent to
re-specify engineering on TRI MOD3.  As a result, when the commands for a
subsequent engineering record around a ZOE were sent by stored commands,
the TRI MOD3 was still configured for science record.

       The NSSC-1 Status Buffer was dumped at 121/2355Z per ROP NS-3.

       Using ROP SR-1, the SSR EDAC counts were cleared.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH