HUBBLE SPACE TELESCOPE

                        DAILY REPORT #2486

PERIOD COVERED:  0000Z (UTC) 10/25/99 - 0000Z (UTC) 10/26/99

Daily Status Report as of 299/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed WF/PC-2 8216 (T Tauri Star Snapshot Survey II. Completing 
the CTTs Sample)

        The WF/PC-2 was used to make observations of the T-Tauri class star 
known as ZZ-Tau as part of Snapshot Survey II.  This database will be of 
fundamental importance to understanding the nature of planet-forming 
environments and their frequency in the galaxy.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.2 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.

    1.3 Completed Six 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.

    1.4 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.

   1.5 Completed WF/PC-2 8272 (The Horizontal Branches of the M-31 Dwarf 
Spheroidal Companions And V & VI)

        The WF/PC-2 was used to make observations of stars in the 
horizontal branches of the M-31 dwarf spheroidal companions galaxies 
Andromeda V & VI.  These dwarf spheroidal galactic companions show a 
surprising diversity in the epochs of their major star formation episodes, 
extending from ~15 Gyr to ~3 Gyr.  The observations were executed as 
scheduled, and no anomalies were reported.

    1.6 Completed STIS/CCD 8412 (STIS CCD Imaging Flats C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
investigate the flat-field stability of the unit over a monthly period.  A 
bias calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.7 Completed Three Sets of 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.

    1.8 Completed Four Sets of STIS/CCD 8549 (POMS Test Proposal: STIS 
non-scripted parallel proposal continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high galactic latitude observations as part of a non-scripted POMS Test 
Proposal. The observations were completed as scheduled, and no problems 
were reported.

    1.9 Completed Three 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.

    1.10 Completed WF/PC-2 8301 (A Snapshot Survey of X-ray Selected 
Central Cluster Galaxies)

        The WF/PC-2 was used to make snapshot survey observations of the 
x-ray, central cluster galaxy A478.  Central cluster galaxies are the most 
massive stellar systems known and have been used as standard candles for 
many decades.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.11 Completed WF/PC-2/STIS/CCD 8324 (The Structure and Kinematics of 
Irradiated Disks and Associated High Velocity Features in Orion)

        Both the WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) 
were used to make observations of high velocity feature M-42-LV2-LV located 
within the Orion Nebula.  The STIS provides us with a unique opportunity to 
study the early evolution of proto-planetary disks and their chances of 
survival in the harsh irradiated environments of OB class associations 
where most stars form.  A wavelength calibration observation was also 
taken.  The observations were completed as planned, and no anomalies were 
reported.

    1.12 STIS/CCD 8147 (Ongoing Mass Transfer in the Galaxy Pair NGC 1409/10)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the galaxy NGC-1409.  A past WF/PC-2 snapshot imaging has 
shown a dust lane connecting the members of the strongly interacting galaxy 
pair NGC-1409/10, as well as polar dust structure in NGC-1409.  The 
observations were completed as scheduled, and no problems were reported.

    1.13 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.

    1.14 Completed STIS/CCD/MA2 8161 (Boron in the Magellanic Clouds: A 
Novel Test of Light Element Formation)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
make observations of the star NGC-346-STAR637 which is located in the Large 
Magellanic Cloud is order to study light element formation in that 
region.  Observations of boron abundances in the Magellanic Clouds will 
provide a novel test of the assertion that boron is produced primarily 
through spallation reactions between cosmic rays and ambient interstellar 
nuclei.  A wavelength calibration image was also taken.  The observations 
were completed as planned, and no anomalies were reported.

    1.15 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.

    1.16 Completed WF/PC-2 8436 (POMS Test Proposal: WFII Backup Parallel 
Archive Proposal II)

        The WF/PC-2 was used to make archive observations parallel to the 
prime science observations as part of a POMS test proposal.  This is a POMS 
test proposal designed to simulate scientific plans.  The observations were 
completed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:

                             Scheduled Acquisitions: 6
                                         Successful: 6

                          Scheduled Re-acquisitions: 3
                                         Successful: 3

    2.2 FHST Updates:

                               Scheduled: 15
                              Successful: 15

    2.3 Operations Notes:

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

        HST operations transferred to the back-up facility in Building 23 
last night in preparation for Joint Integrated Simulations 3 (Deploy) and 2 
(EVA-2/Replanning) which will be conducted over the next three days in the 
STOCC area.

        ROP RD-4 was utilized to configure ESTR-2 to 32k record at 
298/1340Z in anticipation of a possible NCC problem.  When the problem did 
not occur, the same ROP was used to re-configure ESTR-2 to standby, with 
the pointer set to the beginning of tape.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/DMH