HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2090

PERIOD COVERED:  0000Z (UTC) 03/27/98 - 0000Z (UTC) 03/30/98

Daily Status Report as of 089/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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
first iteration of this proposal was not executed due to the STIS suspend.
Otherwise, the observations were completed as planned, and no further
anomalies were reported.

   1.2 Completed Five 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.

   1.3 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 first iteration of this proposal was not executed due to
the STIS suspend.  Otherwise, the observations were executed as scheduled,
and no further anomalies were noted.

   1.4 Completed Four Sets of WF/PC-2 6540 (Imaging Circumstellar Nebulae
Around Luminous Blue Variables in the Magellanic Clouds)

       The WF/PC-2 was used to make observations of the curcumstellar
nebula around the luminous blue variable stars BE381, HD269858, HD269927C,
S61 and S119 which are located in the Magallanic Clouds.  The objectives
are to study the distribution of the ionized gas and dust in order to
determine the morphology and physical properties of the circumstellar
nebulae, by observing them in a narrow, line-free V continuum filter and in
the H Alpha emission line.  The observations were executed as scheduled,
and no anomalies were noted.

   1.5 Completed Five 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 first three iterations of this proposal was not executed due
to the STIS suspend.  Otherwise, the observations were completed as
scheduled, and no further problems were reported.

   1.6 Completed Ten 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 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 LHS407.  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.

   1.8 Completed Two Sets of NIC/1/2/3 7819 (A New Stellar Generation in 30
Doradus)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the 30-Doradus nebula.  There is ample evidence for
current star formation within this nebula, which appears to have been
triggered by the massive central cluster {R136}, in and just beyond the
curved nebular filaments surrounding it.  The observations were executed as
scheduled, and no anomalies were noted.

   1.9 Completed Eight 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 STIS/CCD 7438 (Spatially-Resolved Spectroscopy of the UVX
in Elliptical Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was to be used to
make spatially resolved far-ultraviolet observations of the large
elliptical galaxy NGC-3115.  The prominent far-UV upturn {UVX} in the
spectra of elliptical galaxies originates from stars in their old
populations which have evolved beyond the He-flash at the tip of the red
giant branch.  This proposal was not executed due to the STIS suspend.

   1.11 Completed NIC/3 7818 (Spectrophotometry of Pluto and Charon)

       The Near Infrared Camera (Camera Three) was used to make high
signal-to-noise ratio specrophotometric observations of the planet Pluto
and its moon Charon.  These observations will be used to separate the
spectroscopic signatures of each object in future ground-based combined
light measurements.  These spectra will also provide a very sensitive
search for trace molecular components on the surfaces of Pluto and Charon.
The observations were completed as scheduled, and no problems were
reported.

   1.12 Completed STIS/CCD 7810 (Sensitivity of Important Secondary
Wavelength Settings)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard source BD+75D325 as part of a calibration for
sensitivity of important secondary wavelength settings.  This program is
the basic sensitivity measurement for four secondary wavelength settings
which are heavily used in Cycle 7.  It is run once a year.  The
observations were executed as scheduled, and no anomalies were noted.

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

       The WF/PC-2 was used to make observations of the star 04916+175 as
part of a T-Tauri class star survey.  The observations were executed as
scheduled, and no anomalies were noted.

   1.14 Completed WF/PC-2 6770 (Resolving the Nature of Nova Shells)

       The WF/PC-2 was used to make images of the post nova remnant DK-Lac
in order to study its surrounding shells structure.  Past data has indicate
a strong correlation between nova speed class and the ellipticity of the
resulting remnants.  As described in HSTAR 6413 and in 2.1, the acquisition
for this proposal defaulted to fine lock on one FGS only, possibly
affecting three observations.  Otherwise, the observations were completed
as scheduled, and no problems were noted.

   1.15 Completed NIC/1/2 7365 (Unscrambling the Near-Infrared Properties
of Young Planetary Nebulae)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the young planetary nebula OH231.8+4.  Objects of this
class display a number of enigmatic features that have prevented a full
understanding of post-asymptotic giant branch stellar evolution.  The
observations were executed as scheduled, and no anomalies were noted.

   1.16 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.

   1.17 Completed Two Sets of WF/PC-2/STIS/CCD/NIC/1/2 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 and Two) were used to make observations
of the rich star cluster NGC-2209 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 STIS/CCD/MA1/MA2 7509 (High-Velocity Gas and Dust
Evolution in Chamaeleon Clouds)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make observations of the star HD102065 in order to study the
high-velocity gas and dust evolution in Chamaeleon Clouds.  These data
should yield an absorption spectra obtained from the nearby star located
behind this complex of molecular cloud.  A wave length calibration
observation was also taken.  The observations were completed as planned,
and no problems were reported.

   1.19 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.

   1.20 Completed Two 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.

   1.21 Completed FGS 7492 (The Distances to Dwarf Novae, and the
Calibration of the Technique of Infrared Spectroscopic Parallax)

       The Fine Guidance Sensors was used to make astrometric observations
of the dwarf nova SS-Aug  and several other reference stars.  The distances
to dwarf novae are poorly known.  The distance to the object can be
measured using a technique of infrared spectroscopic parallax.  The
observations were completed as scheduled, and no anomalies were noted.

   1.22 Completed NIC/1/2/3 7859 (Blue Compact Dwarf Galaxies -- Young or Old?)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the compact young dwarf galaxy UGC-5272.  These blue
compact dwarf galaxies challenge models of galaxy formation to explain the
presence of small, low-metallicity galaxies experiencing vigorous bursts of
star formation.  The observations were completed as scheduled, and no
problems were reported.

   1.23 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral
Galaxies)

       The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxy NGC-3623.  Near-IR data at HST
resolution are essential for correcting for the effect of dust and will
enable us to derive robust nuclear properties for the sample.  The
observations were executed as scheduled, and no anomalies were noted.

   1.24 Completed NIC/1/2 7454 (The Stellar Content of Powerful Radio
Galaxies -- A NICMOS Survey of 0.8 < z < 1.8 3CR Sources)

       The Near Infrared Camera (Cameras One and Two) was used to make
survey observations of the powerful radio galaxy 3C267.  The study of
distant radio galaxies is complicated by their powerful active nucleus,
whose emission dominates at rest-frame ultraviolet wavelengths, producing
the observed peculiar, elongated morphologies; the underlying stellar
component is lost in the glare.  The observations were completed as
planned, and no anomalies were reported.

   1.25 Completed STIS/MA2 7720 (MAMA Full Field Sensitivity Monitor and
PSF Check)

       The Space Telescope Imaging Spectrograph (MA2) was used to
observations of object NGC-6681 to monitor the sensitivity of the FUV-MAMA
and NUV-MAMA over the full field and monitor the PSF.  The observations
completed as planned, with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 23
                                        Successful : 23

       The acquisition at 087/031317Z defaulted to fine lock backup on
FGS-1 only.  HSTAR 6413 was written.  The proposal mentioned in 1.14 may
have been affected.

                          Scheduled Reacquisitions : 20
                                        Successful : 20

   2.2 FHST Updates:

                              Scheduled : 47
                             Successful : 47

   2.3 Operations Notes:

       TTAC1 went down at 086/0957Z.  The ground system was back on-line at
086/1230Z with TTAC2.

       Using ROP NS-3, the NSSC-1 status buffer was dumped at 086/1415Z and
at 086/1442Z.

       The STIS (and MAMA1) was recovered successfully from suspend at
086/1723Z via operations request #13656.  MAMA2 recovery was accomplished
via the SMS at 088/013805Z.  The proposals described in 1.1, 1.3, 1.5, and
1.10 were affected by this event.

       Analysis of the events surrounding the suspend indicates that the
lamp illumination was not bright enough to trigger the hardware bright
scene detected (BSD) monitor.  The global event threshold monitor was
triggered, resulting in the high voltage turn off error message.  The 654
status message was then issued, actually turning off the high voltage in
the MCE.  The path out to the NSSC-1 took slightly longer than the voltage
monitoring error message.  Since the hardware BSD was not triggered, the
upper bound on the lamp brightness remained at less than approximately
1,000,000 counts.  The Ball recommendation was to allow the MAMA2 recovery
to occur nominally out of the SMS (at 088/013805Z).

       As agreed upon, STIS memory monitor words were set up at 086/2240Z,
and the STIS event flag #3 was cleared at 087/0200Z.

       The NSSC-1 flight software ED report was reset at 086/1724Z, using
ROP NS-5.

       The ground master image was updated at 088/0733Z.

       The SSR EDAC error counter was cleared nine times via ROP SR-1.
HSTAR 6415 was written since an excessive number of EDAC counts were
experienced near 088/130718Z in an unexpected block range.  A re-dump of
the same block range resulted in the same number of counts.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH