HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2328

PERIOD COVERED:  0000Z (UTC) 03/12/99 - 0000Z (UTC) 03/15/99

Daily Status Report as of 074/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of STIS/CCD 8081 (STIS CCD Hot Pixel Annealing
[2- II)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a
dark and a bias calibration observation.  The effectiveness of the CCD hot
pixel annealing process is assessed by measuring the dark current behavior
before and after annealing and by searching for any window contamination
effects.  The observations were executed as scheduled, and no anomalies
were noted.

   1.2 Completed Six 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 Five Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

       The Space Telescope Imaging Spectrograph (CCD) was used 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.  The data will be used 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 WF/PC-2 7377 (Dwarf Elliptical Galaxy
Snapshot Survey II)

       The WF/PC-2 was used to make observations of the dwarf elliptical
galaxies FCC59, FCC76, and FCC189 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.

   1.5 Completed WF/PC-2 7306 (Halo Microlens Source Systems and their
Underlying Stellar Backgrounds)

       The WF/PC-2 was used to to obtain medium-deep broadband images of
seven source stars for microlensing events, plus one additional star, to
determine a} which star was actually lensed, b} the amount of crowding in
our ground-based frames, c} if the stars are normal in the CMD, and d} if
they lie preferentially at the back of the LMC.  The proposal completed
with no reported problems.

   1.6 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.

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

       The WF/PC-2 was used to make observations of galaxy Gal-043826 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.

   1.8 Completed Thirteen 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.

   1.9 Completed Four Sets of 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 NGC6656 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.

   1.10 Completed Two Sets of WF/PC-2 7343 (Photometric Survey of Galaxies
lying Behind Gravitational Lens Cluster)

       The WF/PC-2 was used to make an extensive photometric survey of the
galaxies lying behind the exceptional gravitational lens cluster A2218.
The distortion of these images has been mapped from the ground, and shows
one of the strongest signals to date, but the signal to noise is still
limited.  Using WFPC2 images we show that with two orbits on each of 22
fields covering the cluster we will obtain approximately 10000 galaxies
over a region extending to 0.9 Mpc/h from the cluster center.  The
observations were completed with no reported problems.

   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 7283 (Observation of Circumstellar UV
Absorption Lines)

       The Space Telescope Imaging Spectrograph was used to obtain high
S/N, high-spectral-resolution, far-ultraviolet spectra of the central stars
of two planetary nebulae in order to study absorption lines arising within
the extended neutral and molecular envelopes around the ionized gas.  The
observations executed as planned, and there were no reported anomalies.

   1.13 Completed Two 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.

   1.14 Completed WF/PC-2 7386 (A Snapshot Survey of Nova Shells)

       The WF/PC-2 was used to make observational images of the super nova
shell V2214-OPH in order to detect and measure its expanding gaseous shell.
These observations will trace the distribution of hot and cool gas in the
nova shells, and show their degree of inhomogeneity on both large and small
scales.  The observations were completed as scheduled, and no problems were
noted.

   1.15 Completed Two 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.

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

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

   1.17 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
3C305.0, 3C303.1 and 3C292.0.  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.

   1.18 Completed WF/PC-2 6659 (A Search For Superplanets Around Weak T-
Tauri Stars)

       The WF/PC-2 was used to make observations in the 1 micron band of
the T-Tauri class star HBC637 in order to search for superplanets.  Weak
T-Tauri class stars are thought to have dissipated their circumstellar
disks recently, possibly by forming planetary systems.  The observations
were completed as planned, and no anomalies were reported.

   1.19 Completed STIS/CCD 7475 (The Chemical Content of the Universe at Z<
1.6)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the background quasar Q0302+2223.  Damped Lyman-Alpha
absorption systems provide a means of directly probing the chemical content
of the deep universe.  A wavelength calibration image was also taken.  The
observations were completed as planned, and no problems were reported.

   1.20 Completed WF/PC-2 7341 (Absolute Proper Motions of Nearby Dwarf
Spheroidal Galaxies)

       The WF/PC-2 was used to measure precise absolute proper motions for
four dwarf spheroidal satellites of the Milky Way using
spectroscopically-confirmed background QSOs to define a zero-velocity
reference frame.  The observation completed as planned with no reported
anomalies.

   1.21 Completed WF/PC-2 7467 (Do Massive Star Clusters Form in Young and
Weak Galaxy Interactions?)

       The WF/PC-2 was used to image two interacting galaxy pairs in two
bandpasses {B and I} to determine whether the super star clusters that are
so prevalent in strong, evolved interactions have also been able to form in
the weak or young interactions.  Secondly, if such clusters are found, it
is  hoped to correlate their properties as much as possible to the
strengths and ages of the interactions.  The proposal completed with no
anomalous activity.

   1.22 Completed WF/PC-2 6557 (WF/PC-2 Imaging of Intermediate Redshift
Absorption Selected Galaxies)

       The WF/PC-2 was used to make observations of the galaxy Q1332-FIEL
where a halo appears to be absorbing light from the background
quasi-stellar object.  The observations were completed as planned, and no
problems were reported.

   1.23 Completed FOC/96 6350 (FOC spectroscopy of BALQSOs)

       The Faint Object Camera (f/96) was used to make ultraviolet
spectrographic images of BALQSO 1442+0011 which is known to show broad
emission lines from abundant ions.  This will help us improve our knowledge
of these BAL class objects.  The observations were executed as scheduled,
and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 21
                                        Successful : 21

                          Scheduled Reacquisitions : 22
                                        Successful : 22

   2.2 FHST Updates:

                              Scheduled : 47
                             Successful : 46

       The FHST update scheduled for 074/0552Z failed.

   2.3 Operations Notes:

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

       A NSSC-1 status buffer dump was performed at 073/0715Z as directed
by ROP NS-3.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH