HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2125

PERIOD COVERED:  0000Z (UTC) 05/15/98 - 0000Z (UTC) 05/18/98

Daily Status Report as of 138/0000Z

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 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.

   1.3 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
11H0.9Z2 and 11H0.9Z1 in order to study their 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.

   1.4 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.

   1.5 Completed Seventeen 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 the previous report
and in HSTAR 6475, an acquisition and two re-acquisitions for this proposal
all failed, and the third, fourth and fifth iterations were affected when
the take data flag remained down.  Otherwise, the observations were
completed as planned, and no further problems were reported.

   1.6 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.

   1.7 Completed NIC/1/2/3 7824 (Deep NIC Images of 20 High-Z Damped
Ly-Alpha Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was to be used
to make observations of the high-Z damped Lyman-Alpha (DLA) galaxy
PC0953+474.  The HST imaging together with ground-based spectroscopy will
unify absorption-line studies and faint galaxy imaging studies, providing a
comprehensive picture of the history of assembly, star formation, gas
consumption, and chemical enrichment in the DLA galaxies.  As described in
the previous report and in HSTAR 6475, the acquisition and two
re-acquisitions for this proposal all failed, and the take data flag
remained down.

   1.8 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.  As described in the previous report and in HSTAR 6475, an
acquisition and two re-acquisitions for this proposal all failed, and the
first, second and third iterations were affected when the take data flag
remained down.  Otherwise, the observations were completed as planned, and
no further problems were reported.

   1.9 Completed 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 star HD82558.
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.

   1.10 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.

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

       The Near Infrared Camera (Camera Two) was used to make a search for
low mass/sub-luminous companions to low mass M class stars.  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.

   1.12 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 14H0.5Z2.  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.

   1.13 Completed WF/PC-2 6856 (Early Evolution of Planetary mz-3 Nebulae)

       The WF/PC-2 was used to make observations of the MZ-3 class
planetary nebula called IC6434 in order to study its early evolution.  It
is believed that the physical phenomena which shape the PNe occur early in
their formation history.  The observations were completed as planned, and
no problems were reported.

   1.14 Completed Three 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.

   1.15 Completed STIS/CCD 7333 (STIS Images of 48 Damped Ly-Alpha Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the damped Lyman-Alpha galaxy Q1451+1223.  This study will
unify absorption-line studies, and faint galaxy imaging studies, thereby
allowing a detailed treatment of the history of star formation, gas
consumption, chemical enrichment, and assembly in the population of
galaxies.  The observations were completed as planned, and no problems were
reported.

   1.16 Completed WF/PC-2/STIS/CCD/MA1/NIC/3 7562 (UV Spectroscopy of
Chimneys in Edge-On Galaxies)

       The WF/PC-2, the Space Telescope Imaging Spectrograph (CCD and MA1)
and the Near Infrared Camera (Camera Three) were used to make ultraviolet
observations of the edge-on galaxy NGC-4631.  Theory predicts the cycling
of interstellar material through the galactic Halo.  Hot gas and dust from
SN in the galaxy disk is confined by the ISM from expanding in the plane,
and is pushed preferentially into the halo.  The observations were executed
as scheduled, and no anomalies were noted.

   1.17 Completed NIC/1/2/3 7822 (Grism Spectra of Centaurs and TNOs from
1-2 Microns)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make grism spectra of object 199CQ29 from 1-2 microns.  The surfaces of
Centaurs and Trans-Neptunian Objects TNOs) contain potentially unique
records of early evolutionary processing {accretional and dynamical} in the
outer solar system.  The observations were executed as scheduled, and no
anomalies were noted.

   1.18 Completed Four Sets of NIC/2 7330 (The Fueling of Active Nucleii: A
NICMOS Snapshot Survey)

       The Near Infrared Camera (Camera Two) was used to probe the dark
matter distribution of NGC-4395, ESO137-G34, NGC-3145 and NGC-3393 far from
their centers by observing intervening absorption from the MgII doublet
(lambda 2800) in the spectrum of one background QSO located in a
geometrically optimal position.  HST observations are required because this
feature is in a wavelength range not accessible from the ground, and the
QSO magnitudes and expected strength of absorption make IUE observations
unfeasible.  The proposal completed as expected with no anomalies.

   1.19 Completed NIC/1/2 7218 (Nearby Starburst Galaxies)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the nearby starbursting galaxy NGC-5236.  This proposal
encompasses a study of both the stars and interstellar material in
starburst nuclei which will test ideas about the triggering of starbursts
and whether starbursts propagate outwards in a nucleus.  The observations
were completed as planned, and no anomalies were reported.

   1.20 Completed NIC/2 7221 (Imaging of Quasar Absorber Systems)

       The Near Infrared Camera (Camera Two) was used to make observations
of quasar LBS2230.  These data should detect emission from the foreground
galaxy which causes the damped Lyman-alpha absorption line systems in the
spectra of the quasars.  The observations were completed as planned, and no
problems were reported.

   1.21 Completed NIC/1/2/3 7883 (Infrared Imaging of High Redshift {0.4 <=
z <= 1} Tully-Fisher Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the high redshifted Tully-
Fisher class galaxy HDFFF-SW2.  With the advent of 10 meter class
telescopes combined with the high spatial resolution of the HST, it is now
possible to study the internal kinematics and structural properties of
galaxies out to a redshift of z ~ 1.  The observations were completed as
planned, and no anomalies were reported.

   1.22 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 J0935+0719.  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.

   1.23 Completed FOC (f/96) 6713 (Geometric Measurement of Galaxy Distance)

       The Faint Object Camera (f/96) was used to make observations of
supernova remnant CP1-SN1952 in order to make a distance calibration for
the galaxy in which it is located.  The supernova is being used as a
powerful new geometric method for the determination of a galaxy's distance,
by obtaining high spatial resolution imageing polarization of the candidate
supernova light echoes.  The observations were completed as planned, and no
anomalies were reported.

   1.24 Completed STIS/CCD/MA1/MA2 7673 (STIS MAMA Sensitivity and Focus
Monitor)

       The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to
make observations of standard star AGK+81D266 in order to perform a MAMA
sensitivity and focus monitoring program.  This is to monitor sensitivity
of each MAMA grating mode to detect any change due to contamination or
other causes.  The observations were executed as scheduled, and no
anomalies were noted.

   1.25 Completed STIS/CCD 7656 (Spectroscopic and Imaging Sensitivity)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
sensitivity measurements for all supported CCD imaging and spectroscopic
modes.  It is run once a year.  The proposal executed as planned with no
problems.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 27
                                        Successful : 27

                          Scheduled Reacquisitions : 24
                                        Successful : 24

   2.2 FHST Updates:

                              Scheduled : 45
                             Successful : 45

   2.3 Operations Notes:

       The SSR correctable EDAC counts were cleared seven times using ROP SR-1.

       There was an SSR re-transmission at 136/1826Z to recover WF/PC-2
science.  At 137/1330Z another SSR re-transmission recovered NICMOS data.
Both efforts were successful and utilized ROP SR-1.

       The STIS MCE2 reset at 137/150922 while the HST was in an SAA and
while the low voltage was on.  HSTAR was written.  Using ROP NS-12, the
STIS error counter was reset at 137/1526Z.  The MAMA-2 will be recovered at
the next high voltage on event.  Science was not impacted.

       As documented in HSTAR 6476, NSBITERR (The NIC EDAC single bit
error) flagged at 137/024856Z.  Per an operations note, the limit was
changed at 138/0221Z and will remain at that setting until the counter is
reset.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH