HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2423

PERIOD COVERED:  0000Z (UTC) 07/27/99 - 0000Z (UTC) 07/28/99

Daily Status Report as of 209/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD/WF/PC-2 7388 (Black Holes and the Centers of
Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) and the WF/PC-2 were used
to continue our survey of the center of nearby galaxy NGC-4697.  The major goal
is to survey an unbiased set of galaxies with a potentially wide range of black
hole masses.  The sample has been carefully chosen to optimize leverage on the
character of a proposed correlation of black hole mass with galaxy mass.  A
wavelength calibration image was also taken.  The observations were completed
as scheduled with no anomalies.

   1.2 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.  

   1.3 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.  

   1.4 Completed STIS/CCD 8116 (Spectroscopy of the Rapidly-Evolving,
Chemically Inhomogeneous Planetary Nebula BD+30)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
spectrographic observations of the rapidly-evolving, chemically inhomogeneous
planetary nebula BD+30 (a.k.a., PK64+5D1).  One of the few PNe with X-ray
emission from the shocked stellar wind, it is an approved AXAF target.  The
observations were executed as scheduled, and no anomalies were noted.   

   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 8212 (Reconciling the SBF and SNIa Distance Scales)

       The WF/PC-2 was used to make observations of the galaxy NGC-6495 in
order to reconcile the surface brightness fluctuation (SBF) and super novae
type IA (SNIa) distance scales.  It is imperative that we understand the
discrepancy between the SBF and SNIa methods.  The observations were completed
as scheduled, and no anomalies were reported.  

   1.7 Completed STIS/CCD 8410 (STIS CCD Hot Pixel Annealing C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to assess the
effectiveness of the CCD hot pixel annealing process by measuring the dark
current behavior before and after annealing and by searching for any window
contamination effects.  In addition CTE performance is examined by looking for
traps in a low signal level flat.  The observations were completed as planned,
and no anomalies were reported.  

   1.8 Completed 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.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 5
                                        Successful : 5

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates: 

                              Scheduled : 12
                             Successful : 12

   2.3 Operations Notes: 

       The operation team moved to the SAMS back-up facility in preparation for
two Joint Integrated Simulations (JISs) being run this week: JIS #7 (EVA-1) to
be run today and JIS #1 (Rendezvous/Capture) to be run tomorrow and the next
day.

       The SSR EDAC error counter was cleared once per ROP SR-1.

       As described in HSTAR 7202, the STIS EMC experienced a re-try at
208/220210Z.  ROP NS-12 was executed to reset the STIS flight software error
counter.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH