HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2397

PERIOD COVERED:  0000Z (UTC) 06/18/99 - 0000Z (UTC) 06/21/99

Daily Status Report as of 172/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.  The observations were executed
as scheduled, and no anomalies were noted.

   1.2 Completed Eight 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 Five Sets of WF/PC-2 6355 (A UV Atlas of Nearby Galaxies)

       The WF/PC-2 was used to make ultraviolet observations of the nearby
galaxies NGC-4425, NGC-4564, NGC-3773, NGC-4526 and NGC-3370.  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.

   1.4 Completed FOC/96/WF/PC-2 7274 (Secular Changes in the Jet of M-87)

       The Faint Object Camera (f/96) and the WF/PC-2 were both used to
make observations of the secular changes in the jet coming off of the
active galactic nuclei of galaxy M-87.  Past observations with the FOC have
shown changes as small as 0.03", and provide a unique opportunity to study
proper motions and structural changes of the jet.  An internal flat
calibration image was also taken.  The observations were completed as
scheduled, and no anomalies were reported.

   1.5 Completed Twenty Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted
parallel Condition V proposal.  The observations were completed as
scheduled, and no anomalies were reported.

   1.6 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.

   1.7 Completed Two Sets of STIS/CCD 8470 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted
parallel Condition VI proposal.  The observations were completed as
scheduled, and no anomalies were reported.

   1.8 Completed WF/PC-2 6354 (Measuring Luminosity Evolution in Z = 0.3
Field Galaxies)

       The WF/PC-2 was used to make snapshot observations of the galactic
cluster Gal-Cluster-1723 located at a distance of Z = 0.3.  The targets
were drawn from a much larger pool of galaxies for which the internal
kinematics have been measured from an extensive ground based program.  The
observations were executed as scheduled, and no anomalies were noted.

   1.9 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
3C326.0 and 3C285.0.  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.

   1.10 Completed STIS/CCD/MA1/MA2 7773 (Simultaneous Multiwavelength
Observations of the Dwarf Nova Oscillations of SS Cygni)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make simultaneous multiwavelength observations oscillations of the dwarf
nova SS-Cygni.  We attempted a multiwavelength campaign using RXTE, EUVE,
HST, and ground-based optical telescopes to characterize the dwarf nova
oscillations of SS Cygni.  The observations were executed as scheduled, and
no anomalies were noted.

   1.11 Completed WF/PC-2 8054 (WF/PC-2 Linear Ramp Filters Calibration)

       The WF/PC-2 was used to make observations of the standard star
GRW+70D582 in order to execute a series of linear ramp filter calibrations.
The observations were completed as planned, and no problems 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 7504 (Calibration of Nearby Type Ia Supernovae as
Standard Candles: The Next Three-Year Step)

       The WF/PC-2 was used to make observations of parent galaxy NGC-4527
in order to determining its Cepheid distance.  This is to continue the
calibration of the Type 1a supernova as standard candles.  The observations
were completed as planned, and no problems were reported.

   1.15 Completed Two Sets of WF/PC-2 7470 (A Snapshot Survey of Galactic
Globular Clusters)

       The WF/PC-2 was used to make snapshot survey observations of the
crowded center of the galactic globular cluster NGC-4117.  The resulting
color-magnitude diagram will include all stars down to about one magnitude
below the main-sequence turnoff.  The observations were completed as
scheduled, and no problems were reported.

   1.16 Completed WF/PC-2 6461 (High-Resolution Next Bright Galactic Nova)

       The WF/PC-2 was used to make high resolution images of the bright
galactic nova U-Scorpii after it erupted to search for fluorescence and
reflection light echoes from, and small-scale structure in, the nova
circumstellar gas and dust ejecta.  The observations were executed as
scheduled, and no anomalies were noted.

   1.17 Completed 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 cluster M-31-G327 which is located in the Andromeda Galaxy
(a.k.a., M-31).  The observations were executed as planned, and no problems
were reported.

   1.18 Completed WF/PC-2 7431 (Snapshot Survey of Microlensed Source Stars)

       The WF/PC-2 was used to make snapshot survey images of microlensed
source stars MACHO-156 and MACHO-95-4.  Gravitational microlensing surveys
have revealed an excess of lensing events over theoretical predictions
toward both the Large Magellanic Cloud and the Galactic Bulge.  The
observations were completed as planned, and no anomalies were reported.

   1.19 Completed Two Sets of WF/PC-2 6512 (The Formation of the Galaxy:
Completing the Age Profile of the Outer Halo Globular Clusters)

       The WF/PC-2 was used to make observations to measure the age of
globular cluster AM1 which is located in the distant outer halo to the
Milky Way.  Comparison of its age with those of clusters in the inner halo
and bulge will be a major component of reconstructing the early galactic
formation history throughout the entire halo.  The observations were
executed as scheduled, and no anomalies were noted.

   1.20 Completed WF/PC-2 8441 (WF/PC-2 Decontaminations and Associated
Observations Pt. 1/2)

       The WF/PC-2 was used to make its monthly decontamination operations
and observations of standard star GRW+70D582.  Also included are instrument
monitors tied to decons: photometric stability check, focus monitor, pre-
and post-decon internals {bias, internal flats, k-spots, and darks}, and
ultraviolet throughput checks.  The observations were executed as
scheduled, and no anomalies were noted.

   1.21 Completed WF/PC-2 8095 (Accurate Proper Motions of Galactic Halo
Populations)

       The WF/PC-2 was used to make observations of the galaxy Leo-I in
order to study the proper motion of its galactic halo population, which
include globular clusters and dwarf galaxies.  The proper motions of these
populations will be determined to unprecedented accuracy, approximately an
order of magnitude better than has been previously possible.  The
observations were executed as scheduled, and no anomalies were noted.

   1.22 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.

   1.23 Completed STIS/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 (MA1) was used to make
He-II absorption line observations of quasar HS1200+153.  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.  The observations were executed as
scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 24
                                        Successful : 23

       Per HSTAR 7180, the two full maneuver updates at 170/010650Z and at
170/010935Z failed due to FHST-2.  This resulted in the following
acqusition scheduled for 170/011219Z to fail when the search radius limit
was exceeded for FGS-1.  A realtime attitude reference update was uplinked
at 172/0243Z and the following re-acquisition was successful.  Two
proposals occurring during the period of the next report, WF/PC-2 8210 and
STIS 7949, were affected when the take data flag remained down.

                          Scheduled Reacquisitions : 24
                                        Successful : 24

   2.2 FHST Updates:

                              Scheduled : 59
                             Successful : 57

        See 2.1 for FHST update failure details.

   2.3 Operations Notes:

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

       STIS MCE-1 reset at 169/121800Z while the high voltage was off and
while in an SAA interval.  MCE-1 reset again at 170/173825Z while the high
voltage was off and while outside an SAA interval.  In each case the STIS
error counter was reset per ROP NS-12.  STIS operations were not affected
since the MAMA-1 was recovered in each case via normal SMS commanding.

       VDS problems were experienced when service was down between
170/1500Z and 170/1600Z

       The SSR 32k engineering record pointer was set at 170/1659Z.

       A TTR was written for a 21-second loss of 32k engineering data due
to severe weather at WSGT.

       The NICMOS FPA temperature sensor for detector 2 was enabled at
171/0820Z per an operations request.

       ESTR reconditioning was performed at 172/0218Z as directed by ROP RD-7.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH