HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2420

PERIOD COVERED:  0000Z (UTC) 07/22/99 - 0000Z (UTC) 07/23/99

Daily Status Report as of 204/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two 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/MA1 7345 (Origin and Physical Conditions in the Local
Lyman-Alpha Forest)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of PG1211+143 in order to study the origin and physical conditions
in the local Lyman-Alpha forest.  A wavelength calibration image was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.3 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

       The WF/PC-2 was used to make a bias, and an internal flat, observation
as part of a Cycle-8 monitoring program to monitor the health of the cameras. 
A variety of internal exposures are obtained in order to provide a monitor of
the integrity of the CCD camera electronics in both bays {gain 7 and gain 15},
a test for quantum efficiency in the CCDs, and a monitor for possible buildup
of contaminants on the CCD windows.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.4 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.  

   1.5 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.  

   1.6 Completed WF/PC-2 8195 (The Stellar Halo and the Metallicity
Distribution Function in the Giant Elliptical NGC 5128)

       The WF/PC-2 was used to make observations of the giant elliptical galaxy
NGC-5128 in order to study its stellar halo and the metallicity distribution
function.  Because this galaxy is 2 magnitudes closer than any other giant
elliptical galaxy, it gives us a unique opportunity to study the enrichment
history at a level of detail that is impossible for any other such galaxy.  The
observations were completed as planned, and no problems were reported.  

   1.7 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.  

   1.8 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.  

   1.9 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ0200-3 as part of a second generation survey to search for
bright lensing quasars.  With the restored PSF, new images will be considerably
more sensitive to the presence of both close separation and faint lens
components, and because STIS reaches two magnitudes fainter the PC, the new
snapshot images will have much greater dynamic range.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.10 Completed STIS/CCD 8037 (STIS Coronographic Imaging of Circumstellar
Discs)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
coronographic observations of the circumstellar protoplanetary disk around the
star Fomalaut (a.k.a., Alpha PsA).  The observations were executed as
scheduled, and no anomalies were noted.  

   1.11 Completed WF/PC-2 7374 (Probing Low Density Cluster Environments at
Moderate-to-High Redshifts)

       The WF/PC-2 was used to make observations of the galactic cluster
Gal-Clus-0723.  Recent HST WF/PC-2 images of rich clusters at moderate-to-high
redshifts have revealed that morphological information is a crucial ingredient
in understanding the physical processes responsible for the evolution of the
galaxy population in clusters.  The observations were executed as scheduled,
and no anomalies were noted.  

   1.12 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.  

   1.13 Completed STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) was used to make a
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal will
provide the primary means of checking on the health of the MAMA detectors. 
This is done through frequent monitoring of the background count rate.  The
observations were completed as planned, and no problems were reported.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 7
                                        Successful : 7

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates: 

                              Scheduled : 17
                             Successful : 17

   2.3 Operations Notes: 

       Upon conclusion of GSFC Internal Simulation #8 (EVA-3), the operations
team returned to the STOCC.  No problems were encountered while operating out
of the SAMS back-up facility.

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

       HSTAR 7201 documents limit violations for the SA wing blanket
temperature 2 at 203/180959Z (5 minutes) and at 203/1994823Z (3 minutes).  Each
low reading (-102.1 and 104.0 respectively) was at the end of the orbit night
period.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH