HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2425

PERIOD COVERED:  0000Z (UTC) 07/29/99 - 0000Z (UTC) 07/30/99

Daily Status Report as of 211/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed 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 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.  

   1.3 Completed Three 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.  

   1.4 Completed Two Sets of 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.  

   1.5 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.  

   1.6 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 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.  

   1.8 Completed WF/PC-2 8310 (White Dwarf Distances to Globular Clusters and
the RR-Lyrae Luminosity Calibration  M-5.)

       The WF/PC-2 was used to make observations of NGC-5904 (a.k.a., M-5) in
order to study its white dwarf and RR-Lyrae class starts.  Despite the efforts
of Hipparcos, the RR-Lyrae absolute magnitude calibration, M_V{RR}, remains
uncertain at a level which critically compromises these stars' use as standard
candles.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.9 Completed STIS/CCD/MA1 8188 (Snapshot Spectroscopic Diagnostic Survey of
the Symbiotic Stars)

       The Space Telescope imaging Spectrograph (CCD and MA1) was used to make
ultraviolet observations of star RJ105 as part of a snapshot spectroscopic
diagnostic survey of symbiotic stars.  Using these data we will be able to
establish meaningful statistical limits on the nature of hot component sources
of ionization and fundamental wind parameters, which are vital steps toward
understanding the accretion hydrodynamics and the evolutionary status of
symbiotic systems.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.10 Completed STIS/CCD 8111 (CS 22892--052: A Rosetta Star for the Age and
Early History of the Galaxy)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the “Rosetta” star CS 22892-052 (a.k.a., HD122563).  These
observations should provide significant new information about the early history
of the galaxy, specifically the nature of the earliest generations of stars and
the types of nucleosynthetic processes that occurred in those stars.  A
wavelength calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.11 Completed STIS/CCD/MA2 8225 (Absorption and Obscuration in Radio-Loud
Quasars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the radio-loud quasar MRC1222-29.  The role of associated
absorption systems and dust obscuration close to the central engines of AGN is
not understood.  A wavelength calibration image was also taken.  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 Reacquisitions : 11
                                        Successful : 11

   2.2 FHST Updates: 

                              Scheduled : 12
                             Successful : 112

   2.3 Operations Notes: 

       The HST operations team will transfer operations to the STOCC area later
today after the completion of JIS #1 (Rendezvous/Capture).

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

       The NICMOS FPA temperature sensor for detector 3 was enabled at
210/1121Z.

       The STIS MCE-2 reset at 211/032251Z while the high voltage was off and
while in an SAA interval.  The STIS flight software error counter was reset at
211/0412Z per ROP NS-12.  MAMA-2 will be recovered via normal SMS commanding at
211/1638Z, the time of the next high voltage on.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH