HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2393

PERIOD COVERED:  0000Z (UTC) 06/14/99 - 0000Z (UTC) 06/15/99

Daily Status Report as of 166/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

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

       The WF/PC-2 was used to make snapshot survey images of microlensed
source star Macho-104.  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.

   1.3 Completed STIS/CCD 8080 (STIS Spectroscopic CCD Flatfielding --
Revised)

       The Space Telescope Imaging Spectrograph (CCD) was used to make CCD
flat fielding calibration observations in the spectroscopic mode.  The
observations were completed as planned, and no anomalies were reported.

   1.4 Completed Four Sets of WF/PC-2 8442 (WF/PC-2 Cycle 8 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 8 standard dark
calibration observations.  This dark calibration program obtains dark
frames every week in order to provide data for the ongoing calibration of
the CCD dark current rate, and to monitor and characterize the evolution of
hot pixels.  The observations were executed as scheduled, and no anomalies
were noted.

   1.5 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.

   1.6 Completed Three 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.

   1.7 Completed Two 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.

   1.8 Completed 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.

   1.9 Completed STIS/CCD 8262 (Nuclear Kinematics of the Dense Globular
Cluster M-15)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of star HD122563 as part of the study of the nuclear
kinematics of the dense globular cluster M-15.  The high central density of
M-15 makes it unique for probing the structure and evolution of globular
clusters.  The observations were completed as planned, and no anomalies
were reported.

   1.10 Completed WF/PC-2 7628 (WF/PC-2 Cycle 7 Photometric Characterization)

       The WF/PC-2 was used to make observations of globular cluster
NGC-5139 as part of a photometric characterization calibration observation.
This is to determine whether any changes in the zeropoint, the spatial
dependence of the zeropoint, or contamination rates have occurred.  The
observation was executed as scheduled, and no anomalies were reported.

   1.11 Completed Two Sets of 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.
Also included are instrument monitors tied to decons: photometric stability
check, focus monitor, pre- and post-decon internals {bias, ultraviolet
flats, & darks}, and ultraviolet throughput checks.  The observations were
executed as scheduled, and no anomalies were noted.

   1.12 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.  A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed Two Sets of 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.

   1.14 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-14503 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.

   1.15 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-5377.  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.

   1.16 Completed 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 15
                             Successful : 15

   2.3 Operations Notes:

       The correctable SSR EDAC errors were cleared four times, per ROP SR-1.

       An additional 52 minutes of SSAR service was requested for the
period 165/1640Z-1823Z when portions of previously scheduled critical SSAR
support was not available.  This was to support the data requirements of
the proposal detailed in 1.12.

       A TTR was written for an instance when a GCMR at approximately
failed to change telemetry to 4K.  The failure was due to an NCC multinet
process server error.

       The STIS MCE-1 reset at 166/033845Z while the low voltage was on and
while in an SAA interval.  The STIS flight software error counter was reset
at 166/0358Z as directed by ROP NS-12.  MAMA-1 will be recovered via normal
SMS commanding at 167/1911Z, the next time that the next high voltage will
be turned on.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH