HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2422

PERIOD COVERED:  0000Z (UTC) 07/26/99 - 0000Z (UTC) 07/27/99

Daily Status Report as of 208/0000Z

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 8298 (Binary Interaction in the Mira AB Accreting
System)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the binary interaction in the Mira AB accreting system (a.k.a.,
HD14386).  The Mira AB system belongs to a class of detached binaries in which
a compact object accretes mass from the wind of a cool giant or supergiant.  A
wavelength calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.3 Completed Two Sets of 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 Four Sets of WF/PC-2 8442 (WF/PC-2 Cycle 8 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 8 standard dark
calibration observations.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD dark
current rate, and to monitor and characterize the evolution of hot pixels.  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 STIS/CCD 8202 (Bright Quasar Close Lensing Search)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ2032-5 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.  

   1.7 Completed WF/PC-2 6833 (A Cepheid Search in the Virgo Cluster Galaxy NGC
4571)

       The WF/PC-2 was used to make observations of the Virgo Cluster galaxy
NGC-4571 in order to search for Cepheid variable stars.  The determination of
the distance to the Virgo Cluster is key to establishing the value of the
H_zero.  The observations were completed as planned, and no problems were
reported.  

   1.8 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.  

   1.9 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.  

   1.10 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-5308 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.  

   1.11 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.  

   1.12 Completed STIS/MA2 8275 (Ultraviolet Snapshots of 3CR Radio Source
Counterparts at Low Z)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
ultraviolet snapshot observations of the radio galaxy 3C317.0.  Radio galaxies
are an important class of extragalactic objects, representing one of the most
energetic astrophysical phenomena, while extraordinarily useful as probes of
their environments and of the early Universe.  The observations were completed
as scheduled, and no anomalies were reported.  

   1.13 Completed STIS/CCD/MA1 8232 (The Youngest Super-Star-Cluster)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of one of the youngest known super-star-clusters NGC-5253.  Local
starbursts are the most immediate counterparts to the high-redshift,
actively-star-forming galaxies, and the study of starbursts and their
constituents can shed light on the initial phases of galaxy evolution.  A
wavelength calibration image was also taken.  The observations were completed
as planned, and no problems were reported.

   1.14 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in the
neighborhood of bright galaxies are treated in a slightly different way from
the normal pure parallels.  Local group galaxies offer the opportunity for a
closer look at young stellar populations.  The observations were completed as
planned, and no anomalies were reported.  

   1.15 Completed STIS/MA2 8426 (Cycle 8 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) 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 : 4
                                        Successful : 4

                          Scheduled Reacquisitions : 10
                                        Successful : 10

   2.2 FHST Updates: 

                              Scheduled : 15
                             Successful : 15

   2.3 Operations Notes: 

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

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH