HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2468

PERIOD COVERED:  0000Z (UTC) 09/29/99 - 0000Z (UTC) 09/30/99

Daily Status Report as of 273/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of WF/PC-2 8443 (WF/PC-2 Cycle-8 Supplemental Darks
pt1/3)

       The WF/PC-2 was used to obtain 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 problems were reported.  

   1.2 Completed STIS/CCD 8408 (STIS CCD Dark Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is to monitor the darks for the STIS CCD. 
The observations were executed as scheduled, and no anomalies were reported.  

   1.3 Completed STIS/CCD 8271 (A Snapshot Survey of LMC Planetary Nebulae: A
Study of Nebular and Late Stellar Evolution)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
medium-resolution slitless spectroscopy snapshot images of the planetary
nebulae LMC-SMP-10 located in the Large Magellanic Cloud to study the parallel
evolution of the nebulae and their central stars.  The observations were
completed as planned, and no problems were reported.  

   1.4 Completed Two Sets of STIS/CCD 8313 (Imaging the Host Galaxies of High
Redshift Type Ia Supernovae)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of 97198 and its host galaxy.  The propose is to obtain snapshot,
unfiltered STIS images of distant galaxies of known redshift which have hosted
supernovae {SNe} of Type IA found via the Supernova Cosmology Project.  The
observations were completed as scheduled, and no anomalies were reported.  

   1.5 Completed Three Sets of WF/PC-2 8436 (POMS Test Proposal: WFII Backup
Parallel Archive Proposal II)

       The WF/PC-2 was used to make archive observations parallel to the prime
science observations as part of a POMS test proposal.  This is a POMS test
proposal designed to simulate scientific plans.  The observations were
completed as planned, and no anomalies were reported. 

   1.6 Completed STIS/CCD 8409 (STIS CCD Bias Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is to monitor the bias in the 1x1, 1x2,
2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N
superbiases and to track the evolution of hot columns.  The observations were
executed as scheduled, and no anomalies were reported.  

   1.7 Completed STIS/CCD 8229 (Spatially Resolved Spectroscopy of Titan's
Atmosphere and Surface)

       The Space Telescope Imaging Spectrograph (CCD) was used to observe the
moon Titan.  The observations will measure the surface reflectivity of Titan at
0.9 microns, and map the distribution of haze in the northern and southern
hemispheres at altitudes where the haze is formed.  The proposal completed
nominally.

   1.8 Completed WF/PC-2 8301 (A Snapshot Survey of X-ray Selected Central
Cluster Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of the x-ray,
central cluster galaxy A291.  Central cluster galaxies are the most massive
stellar systems known and have been used as standard candles for many decades. 
The observations were executed as scheduled, and no anomalies were noted. 

   1.9 Completed Two 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.  

   1.10 Completed STIS/CCD/MA1 7481 (The Wind-momentum Luminosity Relationship
for M31 and M33 B-supergiants)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the B class supergiant star M-31- OB48 which is locate in the
M-31 galaxy.  The purpose of these observations is to  acquire STIS
low-resolution ultraviolet spectra of early B-supergiants in galaxies M31 and
M33 to determine the terminal velocities of their stellar winds.  The
observations were completed as planned, and no anomalies were reported.  

   1.11 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of Sight
With Intergalactic He-II Absorption Towards 26 Bright z > 2.9 Quasars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
He-II absorption line observations of quasar HE2218-191.  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.  

   1.12 Completed WF/PC-2 7342 (The Most Powerful Gravitational Lens)

       The WF/PC-2 was used to make observations one of the most powerful
gravitational lens systems in Gal-Clus-1732 (Near the quasar pair PC1643+4631
A,B).  This is the first high-redshift structure to be detected by observations
of the microwave background.  The observations were completed as planned, and
no anomalies were reported.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions:  4
                                        Successful:  4

                         Scheduled Re-acquisitions: 10
                                        Successful: 10

   2.2 FHST Updates: 

                              Scheduled: 8
                             Successful: 6

       The updates at 273/091900Z and at 273/092145Z failed.

   2.3 Operations Notes: 

       The following item was inadvertently omitted from yesterday’s report:
The STIS MCE-1 reset at 271/0926Z while in an SAA region and while the low
voltage was on.  The STIS flight software error counter was reset.  MAMA-1
recovery was accomplished via normal SMS commanding at 271/1051Z.

       The STIS MAMA-2 recovery exercise continues.

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

       A test using the Canberra ground station was conducted at 272/1318Z per
an operations request.

       At 272/1415Z, following the Canberra test when TDRSS acquired data, the
CCS “A” string would not ingest any data; however, the CCS “G” string back-up
did ingest data normally.  A re-cycle of CCS “A” string was successful.  All
processes began operating nominally.

       As documented in HSTAR 7282, the Main Bus-A voltage flagged
out-of-limits high at 272/163611Z with a value of 32.712.  The limit is 32.71
volts.  At the time there was no spacecraft activity, and the HST was in the
middle of an orbit day period.

       ROP RD-1 was used to command an engineering tape recorder playback at
272/1948Z.

       A TTR was written for having no GSMR capability at 272/2029Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of the STIS MAMA-2 recovery process.

       Continuation of normal science observations and calibrations.

/DMH