HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2415

PERIOD COVERED:  0000Z (UTC) 07/15/99 - 0000Z (UTC) 07/16/99

Daily Status Report as of 197/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.  

   1.2 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, internal flats,
k-spots, and darks}, and ultraviolet throughput checks.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.3 Completed WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats -- Part II)

       The WF/PC-2 was used to take Earth flat calibration images.  This
proposal obtains sequences of Earth streak flats to construct high quality flat
fields for the WF/PC-2 filter set.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.4 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.  

   1.5 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.  

   1.6 Completed WF/PC-2 6685 (Globular Cluster Systems Along the Hubble
Sequence)

       The WF/PC-2 was used to make images of the globular cluster IC5176-HAL
in order to study the globular cluster systems along the Hubble sequence.  This
proposal is studying six globular cluster systems which are located in edge-on
galaxies beyond the Local Group.  The observations were executed as scheduled,
and no anomalies were noted. 

   1.7 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.  

   1.8 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.  

   1.9 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.  

   1.10 Completed STIS/CCD 8226 (Discerning the Origins of Blue Stragglers:
Masses and Rotation Rates)

       The Space Telescope Imaging Spectrograph (CCD) was to be used to study
the blue stragglers in globular cluster NGC-104.  Conventional wisdom holds
that the masses of Blue Straggler Stars in globular clusters are significantly
larger than the turnoff mass.  As described in 2.1 and HSTAR 7194, the
acquisition for this proposal failed and the take data flag remained down.

   1.11 Completed WF/PC-2 8251 (The Second-Parameter Effect in Metal- Rich,
Globular Clusters: A Snapshot Study of NGC 6441)

       The WF/PC-2 was used to observe the newly-discovered hot horizontal
branch (HB) populations in the metal-rich globular cluster (GCs) NGC 6441
providing an unique opportunity for unraveling the second-parameter effect. 
While it has long been known that at least one parameter besides the
metallicity, Fe/H, determines the HB morphology of GCs, our ignorance as to the
nature of this second parameter {or parameters} has been a major stumbling
block in understanding the formation history and age of the GC system.  The
proposal completed nominally with no reported problems.

   1.12 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.  

   1.13 Completed Four 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 PAL14 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.  

   1.14 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.   

   1.15 Completed STIS/CCD/MA2 8342 (Abundances in Halo Stars and Galactic
Element Formation)

       The Space Telescope Imaging Spectrograph (MA1 and CCD) was used to make
observations of star HD115444 as part of a study of the abundances in halo
stars and galactic element formation.  The results for the very oldest galactic
stars will also provide an important, and independent, age determination for
the Galaxy and hence constrain cosmological age estimates.  A wavelength
calibration image 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 : 4
                                        Successful : 4

       The acquisition at 196/085412Z (unreported in yesterday’s reports)
failed when the search radius limit was exceeded on FGS-3.  HSTAR 7194 was
written.  The STIS proposal described in 1.10 was affected.  Later, ROP NS-12
was utilized at 196/0950Z to reset the STIS flight software error counter.

                          Scheduled Reacquisitions : 11
                                        Successful : 11

   2.2 FHST Updates: 

                              Scheduled : 9
                             Successful : 9

   2.3 Operations Notes: 

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

       The STIS MCE-2 reset at 196/211141Z while the high voltage was off and
while the vehicle was in an SAA interval.  MAMA-2 was recovered via normal SMS
commanding at 196/2315Z, the time of a high voltage turn-on.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH