HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2358

PERIOD COVERED:  0000Z (UTC) 04/23/99 - 0000Z (UTC) 04/26/99

Daily Status Report as of 116/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Five Sets of WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats --
Part II)

       The WF/PC-2 was used to take Earth flat calibration images.  This
proposal obtains sequences of Earth streak flats to construct high quality
flat fields for the WF/PC-2 filter set.  The observations were executed as
scheduled, and no 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.
The observations were completed as planned, and no anomalies were noted.

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

   1.4 Completed Three Sets of STIS/CCD 7361 (The Nature of Nuclear
Activity in Nearby Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the nuclear region of galaxies N4321, N4459 and N4477.  The
high resolution spectra will be used to search for broad components in
H-Alpha and for velocity gradients, indicative of gas rotation or other
ordered motions. A wave length calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.5 Completed Seven Sets of 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.

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

       The WF/PC-2 was used to make observations of the radio galaxy
3C217.0.  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.

   1.7 Completed Eight 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.

   1.8 Completed Two Sets of WF/PC-2 7281 (Snapshot Survey of the B2 Sample
of Radio Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of the B2
sample radio galaxies B2+0908+37 and B2+0648+27.  This program is aimed to
answer the following key questions: How common are extended nuclear disks?
What is their orientation and morphology?  How common are optical jets?
The observations were executed as scheduled, and no anomalies were noted.

   1.9 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.

   1.10 Completed STIS/MA1 7298 (A Snapshot Survey for UV bright Quasars at
redshift below 3)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
ultraviolet snapshot observations of the bright quasar CSO1108 which has a
redshift (Z) below 3.0.  The goal is to find quasars bright enough in the
ultraviolet for spectroscopic follow-up in the range of 900-1200 Angstroms.
A wave length calibration image was also taken.  The observation were
completed as scheduled, and no anomalies were reported.

   1.11 Completed Three Sets of STIS/CCD 7438 (Spatially-Resolved
Spectroscopy of the UVX in Elliptical Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
spatially resolved far-ultraviolet observations of the large elliptical
galaxies NGC-4649 and 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.  The observations were completed as scheduled, and no
anomalies were reported.

   1.12 Completed FOC/96 7923 (FOC F/96 Turnon)

       The Faint Object Camera (f/96) was used to take an internal flat and
a dark to ensure that the 30-day limit for the FOC is not exceeded.  The
observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section
Only): Cycle 4)

        This proposal was executed as scheduled, and no anomalies were noted.

   1.14 Completed WF/PC-2 6357 (The Nuclear Morphology of Elliptical Galaxies)

       The WF/PC-2 was used to make images of the early type, large,
elliptical galaxy NGC-3226 (taken from a list of 150 galaxies) in order to
study its nuclear morphology.  This survey will complement Illingworth's
snapshot study of later Hubble types.  The observations were completed as
scheduled, and no anomalies were reported.

   1.15 Completed Two Sets of WF/PC-2 7377 (Dwarf Elliptical Galaxy
Snapshot Survey II)

       The WF/PC-2 was used to make observations of the dwarf elliptical
galaxies FCC242 and FCC214 as part of Snapshot Survey II.  This survey will
provide important information on the globular cluster systems of such
galaxies and the properties of their cores and nuclei.  The observations
were completed as planned, and no anomalies were reported.

   1.16 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-16011 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.

   1.17 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as
Cosmological Tools)

       The WF/PC-2 was used to make survey observations of object B1938+666
by obtaining deep, high-resolution images in the optical and near IR in
order to see if it is gravitational lensed and could be used as a
cosmological tool.  The observations were executed as scheduled, and no
anomalies were noted.

   1.18 Completed STIS/CCD 8226 (Discerning the Origins of Blue Stragglers:
Masses and Rotation Rates)

       The Space Telescope Imaging Spectrograph (CCD) was used to study the
blue stragglers in globular cluster NGC-5272-OF.  Conventional wisdom holds
that the masses of Blue Straggler Stars in globular clusters are
significantly larger than the turnoff mass.  A wavelength calibration
observation was also taken.  The observations were executed as scheduled,
and no anomalies were noted.

   1.19 Completed STIS/CCD/MA2 7290 (C-IV In Extensive Gaseous Halos of QSO
Lyman-Alpha Absorbing Galaxies)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
make observations of the QSO, Lyman-Alpha, absorbing galaxy TON28.
Detection of absorption features would imply that the halo gas of this
galaxy has been enriched by some sort of galactic fountain (in place of a
halo star formation) and would also determine up to which radius this
process has operated.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.20 Completed STIS/MA1 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) was used to make a
dark calibration image.  This is to establish if the detectors are
performing nominally, that no internal movement of the MCP has taken place,
and establish dark level in orbit for a given operating temperature.  These
darks will be used in later image reduction and also trended over
instrument life time as indicators of detector degradation or damage.  The
observations were completed as planned, and no problems were reported.

   1.21 Completed WF/PC-2/STIS/CCD 7615 (Determination of the Mass Function
of a Globular Cluster Through Gravitational Microlensing)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make gravitational microlensing observations of the large globular
cluster NGC-6656 located in Sagittarius in order to study its mass
function.  Gravitational microlensing offers a unique and direct method of
determining the masses of stars and other compact objects down to planetary
masses.  A bias and dark calibration observations were also taken.  The
observations were completed as planned, and no problems were reported.

   1.22 Completed WF/PC-2 6436 (High-Resolution Narrow-Band Imaging of
Liners, in Search of Their Central Engines)

       The WF/PC-2 was used to make high-resolution, narrow-band
observations of the galaxy NGC-5005 in order to search for its central
engine and to try to image its LINER.  More than 30% of all galaxies
contain LINER nuclei, which may be the weakest but most common
manifestation of quasar activity.  The observations were completed as
planned, and no problems were reported.

   1.23 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.

   1.24 Completed WF/PC-2 6480 (The Butcher-Oemler Effect: Where Have All
The Spirals Gone?)

       The WF/PC-2 was used to make observations of the blue disk-type
galaxy A851-POS2 in order to study the Butcher-Oemler effect.  Other
observational data show that mergers and tidal interactions were apparently
more common in younger clusters; these may contribute to the disappearance
of spiral galaxies by the present epoch.  The observations were executed as
scheduled, and no anomalies were noted.

   1.25 Completed WF/PC-2 7403 (Measuring Black Hole Masses in Broad-Lined
AGNs)

       The WF/PC-2 was used to make observations of broad-lined active
galactic nuclei (AGN) located in  galaxy NGC-3245.  Broad emission lines in
AGNs are considered one of the most direct signatures of a large central
mass, which is presumed to be a black hole.  A wavelength calibration 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 : 23
                                        Successful : 23

                          Scheduled Reacquisitions : 24
                                        Successful : 24

   2.2 FHST Updates:

                              Scheduled : 55
                             Successful : 55

   2.3 Operations Notes:

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

       Per HSTAR 7109, at 114/235233Z, a status buffer message was received
indicating a STIS EMC retry.  The STIS flight software error counter was
cleared at 115/0020Z.  Then at 115/130821Z, the same event occurred.  HSTAR
7110 was written.  The STIS flight software error counter was cleared at
115/1331Z.

       The PRS was taken down at 115/0548Z due to a DAT tape drive problem.
The PRS was again taken down at 115/0825Z to switch packs.

       The STIS MCE-2 reset at 115/1613Z.  Recovery will be via nominal SMS
commanding at 116/1412Z. 

       The ground master image was updated at 116/0133Z.

       At 116/0710Z, six Line Outage Recorder playbacks were requested in
the interval 115/0838Z to 115/1300Z.  These were required due to PRS ground
system problems.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH