HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2318

PERIOD COVERED:  0000Z (UTC) 02/26/99 - 0000Z (UTC) 03/01/99

Daily Status Report as of 060/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 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.

   1.3 Completed Two Sets of WF/PC-2 6671 (Deep V, I Photometry for 20 M31
Globular Clusters)

       The WF/PC-2 was used to make deep photometry observations (V=27.5)
of the globular clusters M-31-G33 and M-31-G319 which are located in the
Andromeda Galaxy (a.k.a., M-31).  The observations were executed as
planned, and no problems were reported.

   1.4 Completed Eight 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 observations were completed as scheduled, and no problems
were reported.

   1.5 Completed WF/PC-2 6794 (Proper Motions of Herbig-Haro Jets)

       The WF/PC-2 was used to make observations of the Herbig-Haro object
HH47 in order to measure the proper-motions of these high Mach number flows
of its two opposing jets.  The tangential velocities of several hundred
km/s will produce displacements between our first- and second-epoch images
of 2-4 pixels after only two years.  The observations were completed as
planned, and no anomalies were reported.

   1.6 Completed Six 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 6770 (Resolving the Nature of Nova Shells)

       The WF/PC-2 was used to make images of the post nova remnant BT-Mon
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.  The observations were completed as scheduled, and no
problems were noted.

   1.8 Completed Two 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
3C154.0.  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.

   1.9 Completed Three Sets of STIS 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.

   1.10 Completed STIS/CCD/MA1/MA2 7389 (Chromospheres and Transition
Layers in Hyades and Pleiades F Stars)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make observations of the F class star HD27848 which is located in the
Hyades star cluster.  This proposal seeks to obtain additional empirical
constraints on the heating mechanisms for stellar chromospheres, transition
layers and coronae.  A wavelength calibration obseration was also taken.
The observations were completed as planned, and no problems were reported.

   1.11 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.

   1.12 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.

   1.13 Completed WF/PC-2 7500 (The Horizontal Branch of the M31 Dwarf
Spheroidal Companion And III)

       The WF/PC-2 was used to make observations of the M-31 dwarf
spheroidal companion Andormeda III in order to study its stars in the
horizontal branch of the H-R Diagram.  This class of companions show a
surprising diversity in the epoch of their major star formation episodes.
The observations were executed as scheduled, and no anomalies were noted.

   1.14 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.

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

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

   1.16 Completed WF/PC-2 6699 (The Globular Cluster System of the Dwarf
Elliptical System Galaxies NGC-185 and NGC 205)

       The WF/PC-2 was used to make observations of the FJJ globular
cluster system around the nucleus of dwarf galaxy NGC-185.  The propose is
to carry out a general reconnaissance of the properties of the globular
clusters.  The observations were completed as planned, and no anomalies
were reported.

   1.17 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.

   1.18 Completed WF/PC-2 6490 (Deep Imaging of Extended Optical Structure
Around the Quasar 4C37.43)

       The WF/PC-2 was used to make deep images of the extended optical
region around quasar 4C37.43 (aka, B2-1512+37).  This quasar has the most
luminous extended region of any low red shifted quasi-stellar source.  The
observations were completed as planned, and no problems were reported.

   1.19 Completed STIS/MA1 7434 (The Supernova Intensive Study)

       The Space Telescope Imaging Spectrograph (MA1) was used to continue
the long-term project on supernovae by observing SN1987A.  HST can make
unique contributions to understanding supernovae, as has been demonstrated
through this program in past years, and now STIS and NICMOS offer new
opportunities for deepening this investigation.  The aim of the proposal is
to explore the UV emission from supernovae, exploit the spatial resolution
of HST and press the late-time observations of supernovae into uncharted
territory.  The observations were completed as planned, and no anomalies
were reported.

   1.20 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels.  Local group galaxies offer the opportunity
for a closer look at young stellar populations.  The observations were
completed as planned, and no anomalies were reported.

   1.21 Completed Two Sets of WF/PC-2 7505 (The Hubble Diagram for Distant
Supernovae Measuring Cosmic Deceleration and Global Curvature)

       The WF/PC-2 was used to make observations of Super Nova SN1998A1 in
order to produce a precise Hubble diagram from measuring cosmic
deceleration and global curvature.  HST can make an essential contribution
by providing photometry with substantially higher precision and better
temporal coverage than can be obtained from the ground.  The observations
were completed as planned, and no anomalies were reported.

   1.22 Completed WF/PC-2 7497 (WF/PC-2 Observations of Astrophysically
Important Visual Binaries)

       The WF/PC-2 was used to make observations of the visual binary
variable star system MU Cas.  This system is a famous metal-deficient G
dwarf for which accurate masses will lead to the star's helium content with
cosmological implications.  The observations were completed as planned, and
no anomalies were reported.

   1.23 Completed STIS/MA1 7401 (A Critical Test of Crystallization in
White Dwarf Stars)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of the white dwarf star BPM7093-2.  Theoretical calculations
indicate that the massive pulsating DA white dwarf, BPM7093-2, has a
crystallized ion interior.  A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.24 Completed STIS/CCD/MA1 7432 (Morphological and Spectral Evolution
of Galaxies)

       The Space Telescope Imaging Spectrograph (CCD and MA1) were used to
make observations to study the morphological and spectral evolution of the
galaxy 3C348.1.  A library of ultraviolet images of normal galaxies at low
redshifts is essential to our understanding of the properties and evolution
of the high redshift universe.  The observations were completed as planned,
and no problems were reported.

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

       The Space Telescope Imaging Spectrograph (CCD) was 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.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 20
                                        Successful : 20

                          Scheduled Reacquisitions : 21
                                        Successful : 21

   2.2 FHST Updates:

                              Scheduled : 49
                             Successful : 49

   2.3 Operations Notes:

       The day 060 SMS, which begins on March 1, was reprocessed to
accommodate a target of opportunity: high resolution imagery of the next
bright galactic nova.

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

       The SSA transmitter was turned on and off once per ROP IC-2.

       The ground master image was updated at 060/0048Z.

       ESTR re-conditioning was performed at 060/0650Z per ROP RD-7.

       The Gyro-3 drift rate bias trend data shows a decrease since the
last report.  The rate of change over the last two days is 24.75
arcseconds/hour/day (was 34.49 arcseconds/hour/day.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH