HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2360

PERIOD COVERED:  0000Z (UTC) 04/27/99 - 0000Z (UTC) 04/28/99

Daily Status Report as of 118/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of Sight
With Intergalactic He-II Obsorption Towards 26 Bright z > 2.9 Quasars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make He-II absorption line observations of quasar HS1244+314.  The aim is
to identify more suitable bright objects for detailed studies of
intergalactic He-II absorption at a redshift of Z <2.9 and >3.2 .  A
wavelength calibration observation was also taken.  As described in
yesterday's report and HSTAR 7114, the acquisition for this proposal
defaulted to fine lock on one FGS only.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.2 Completed Five Sets of WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental
Darks pt3/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This dark calibration program obtains three dark frames every day to
provide data for monitoring and characterizing the evolution of hot pixels.
As described in yesterday's report and HSTAR 7114, the acquisition for the
first iteration of this proposal defaulted to fine lock on one FGS only.
Otherwise, the observations were completed as planned, and no further
anomalies were noted.

   1.3 Completed Two Sets of STIS/CCD 7949 (CCD Dark and Bias Monitor --
Cont. to June 99)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program.  It was also scheduled
to track the growth of hot pixels on the CCD in general and within the
various target acquisition apertures specifically.  As described in
yesterday's report and HSTAR 7114, the acquisition for the first iteration
of this proposal defaulted to fine lock on one FGS only.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.4 Completed WF/PC-2 6355 (A UV Atlas of Nearby Galaxies)

       The WF/PC-2 was used to make ultraviolet observations of the nearby
galaxy NGC-2798.  The aim of the project is to build a reference
ultraviolet atlas of galaxies whose optical images are well known, with the
highest possible degree of information, covering all the morphological
types and luminosity classes.  The observations were executed as scheduled,
and no anomalies were noted.

   1.5 Completed 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.

   1.6 Completed Three Sets of STIS/CCD 8091 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude, non-scripted, parallel observations.  The observations
were completed as planned, and no anomalies were noted.

   1.7 Completed WF/PC-2 6351 (Resolving SDB Binary Systems)

       The WF/PC-2 was used to make high resolution image of the sdB class,
binary system STAR-17194 in order to try and resolve its two individual
stars.  Evidence has accumulated that a large fraction (if not all) of the
sdB class stars are found in binary systems.  The observations were
executed as scheduled, and no anomalies were noted.

   1.8 Completed Three Sets of WF/PC-2 6967 (Blue Continuum Snapshots of
3CR Radio - Continued Galaxies)

       The WF/PC-2 was used to make observations of the radio galaxies
3C200.0, 3C438.0 and 3C327.1.  Radio galaxies are an important class of
extragalactic objects: they represent one of the most energetic
astrophysical phenomena and they may be used as probes of their
environments.  They are unique probes of the early Universe.  The
observations were completed as planned, and no problems were reported.

   1.9 Completed STIS/CCD 7357 (Testing the Nature of "Type 2" Liners)

       The Space Telescope Imaging Spectrograph (CCD) was used to observe
the "Type 2" LINER NGC-3507.  LINERs, like Seyferts, come in two varieties:
"type 1" have broad permitted lines and "type 2" only have narrow lines.
While LINER 1s undoubtedly are genuine AGNs, the true nature of LINER 2s
remains unknown, although they make up most of the LINER population.  A
wavelength calibration image was also taken.  The proposal completed with
no reported problems.

   1.10 Completed WF/PC-2 6356 (SNAPSHOT Survey of Ultraluminous Infrared
Galaxies)

       The WF/PC-2 was used to make observations of galaxy GAL-073810 as
part of a survey of ultraluminous infrared galaxies.  The nature of
ultraluminous infrared galaxies has generated considerable controversy.
The two main issues are: {1} are they powered by violent bursts of star
formation or by hidden quasars?  {2} are interactions and mergers
invariably involved?  The observations were executed as scheduled, and no
anomalies were noted.

   1.11 Completed Two Sets of STIS/CCD 8393 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
POMS, non-scripted, low galactic latitude observations made in parallel
with the prime science observations.  The observations were executed as
scheduled, and no anomalies were noted.

   1.12 Completed STIS/CCD/MA1 7762 (The Gaseous Environment of the Ursa
Minor Dwarf Spheroidal Galaxy)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
probe the interstellar gas content of the Ursa Minor dwarf spheroidal
galaxy QJ0640-503.  The observations completed as planned, with no reported
problems.

   1.13 Completed WF/PC-2 8090 (POMS Test Proposal: WF-II Parallel Archive
Proposal Continuation)

       The WF/PC-2 was used in the parallel mode to make some low galactic
latitude archive observations.  The program will be used to take parallel
images of random areas of the sky.  The observations were executed as
scheduled, and no anomalies were noted.

   1.14 Completed STIS/CCD/MA2 7402 (Chromospheric Activity in Old Stars:
Halo Subdwarfs' Variability)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
make observations of the old sub-dwarf star HD184499 in order to study its
chromospheric activity.  All normal stars cool enough to have convection
zones share a common minimum level of chromospheric activity which
decreases with advancing spectral type; most show higher emission levels
which vary with time.  A wavelength calibration observation was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.15 Completed WF/PC-2 8152 (Mineralogy and Weathering History of Mars)

       The WF/PC-2 was used to make high spatial resolution and moderate
spectral resolution 5500 Angstrom to 10,000 Angstrom STIS long-slit imaging
spectroscopy observations of the planet Mars.  This is to identify and
globally map the planet's iron-bearing surface mineralogy.  The
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 11
                                        Successful : 11

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 19
                             Successful : 19

   2.3 Operations Notes:

       Using ROP SR-1, the SSR EDAC error counter was cleared once.

       Thw NICMOS FPA temperature sensor for Detector-2 was enabled at
117/1031Z and at 118/0608Z.

       PRS AP2 was rebooted at 117/1630Z and at 118/0727Z.

       An SI C&DH error was reset at 117/1925Z per ROP NS-5.

       At 118/0520Z, the STIS MCE-1 reset while the low voltage was on and
while outside an SAA interval.  The STIS flight software error counter was
rest at 118/0615Z per ROP NS-12.  MAMA-1 recovery will be accomplished via
normal SMS commanding at 119/1343Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH