HUBBLE SPACE TELESCOPE

   DAILY REPORT #2546

PERIOD COVERED:  0000Z (UTC) 01/24/00 - 0000Z (UTC) 01/26/00

Daily Status Report as of 025/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Four 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.

    1.2 Completed Five Sets of WF/PC-2 8460 (Cycle 8 Supplemental Darks pt2/3)

        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 completed with no reported problems.

    1.3 Completed Two Sets of WF/PC-2 8192 (A Snapshot Survey of Probable 
Nearby Galaxies)
        The WF/PC-2 was used to make a snapshot survey images of probable 
nearby galaxies UGC4483 and UGC-A86.  The census of galaxies in the Local 
Volume of space is very incomplete, particularly at the faint end.  The 
observations were executed as scheduled, and no anomalies were noted

    1.4 Completed WF/PC-2 8243 (SINS: The Supernova Intensive Study - Cycle 8)

        The WF/PC-2 was used to make observations of supernova 
SN1999EM.  Supernovae reveal the last stages of stellar evolution, create 
the chemical history of the Universe, energize the interstellar gas, and 
occupy the center of attention for the extragalactic distance scale and 
cosmology.  A wavelength calibration image was also taken.  The 
observations were completed as planned, and no problems were reported.

    1.5 Completed Two Sets of WF/PC-22 8498 (Internal Monitor - Post-TEC 
Turn On)

        The WF/PC-2 was used to obtain routine internal observations in 
order to monitor basic instrument health, and optical alignment (K-spots, 
INTFLATS, VISFLATS, UVFLATS, bias, Darks).  The observations completed 
nominally.

    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 Two Sets of STIS/CCD 8502 (CCD Functional for SMOV3a)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the baseline performance and commandability of the CCD subsystem.    The 
proposal completed normally.

    1.8 Completed WF/PC-2 8269 (The Morphological Evolution of Field Galaxies)

        The WF/PC-2 was used to make observations of the near-infrared 
field galaxies LYNX-A and LYNX-B in order to study their morphology.  The 
observations were completed as planned, and no anomalies were reported.

    1.9 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section 
Only): Cycle 4)

         This proposal was executed as scheduled, and no anomalies were noted.

    1.10 Completed FOC/96 7923 (FOC F/96 Turn-on)

        The Faint Object Camera (f/96) was used to take an internal flat 
and a dark to ensure that the 30-day limit for the FOC is not 
exceeded.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.11 Completed WF/PC-2 8101 (High Resolution Imaging of the Core of 
Maffei 1, the Nearest Normal Massive Elliptical Galaxy)

        The WF/PC-2 was used to obtain high resolution optical images of 
the center of the galaxy Maffei 1, which is the nearest normal 
intermediate-to-giant elliptical galaxy.  The proposal ended nominally.

    1.12 Completed Two 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.

    1.13 Completed WF/PC-2 8249 (A Strong Lensing Survey of the Mass 
Distribution in X-ray Luminous Clusters)

        The WF/PC-2 was used for a gravitational lensing survey of the 
central regions of 16 X-ray luminous clusters from a statistically complete 
sample.  The observations completed with no problems.

    1.14 Completed WF/PC-2/STIS/CCD 8323 (Herbig-Haro Jets Irradiated by 
Massive OB Stars)

        The WF/PC-2 and the Space Telescope Imaging Telescope (CCD) were 
used to observe Herbig-Haro jets powered by young stars.   Among the hoped 
for results are the precise determination of the mass loss rate through a 
jet, and the nature of the flow behavior in the jet launch and collimation 
region.   The proposal completed nominally.

    1.15 Completed  WF/PC-2 8230 (Snapshot Survey of Dynamically Close 
Galaxy Pairs from z=0.1 to z=0.5)

        The WF/PC-2 was used to make snapshot survey observations of 
galactic cluster Gal-Clus-0.  This is to obtain snapshot images of a large, 
well-defined, and dynamically selected sample of close galaxy pairs at 
moderate redshift.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.16 Completed WF/PC-2 8390 (Expansion Parallax Distances to Planetary 
Nebulae)

        The WF/PC-2 was used to make observations of the planetary nebula 
NGC6826 in order to study its parallax distance.  The largest impediment to 
our understanding of planetary nebulae is the lack of reliable 
distances.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.17 Completed WF/PC-2 8242 (Imaging of Dust Structures and Star 
Formation in the Disk-Halo Interface of Spiral Galaxies)

        The WF/PC-2 was used to obtain images of five edge-on spirals to 
study star formation and dusty interstellar clouds in the disk-halo 
interface of these galaxies.  As described in HSTAR 7483 and 2.1, the 
acquisition for this approximate six-hour proposal defaulted to fine lock 
backup, possibly affecting four observations.  Then, as described in HSTAR 
7484 and 2.1, the re-acquisition failed and seven observations were 
affected when the take data flag remained down.

    1.18 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 3C227.0.  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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 14
Successful: 14
  Scheduled Re-acquisitions: 18
Successful: 17

        The acquisition at 025/172456Z failed to fine lock backup on FGS-1 
only when the scan search limit was exceeded on FGS-3.  HSTAR 7483 was 
written.  The proposal described in 1.17 may have been affected by this 
occurrence.

        Per HSTAR 7484, the re-acquisition at 025/185923Z failed when the 
scan search limit was exceeded on FGS-1 (the previous acquisition had 
failed to fine lock on one FGS only).  The proposal described in 1.17 was 
affected.

    2.2 FHST Updates:
Scheduled: 27
Successful: 27

    2.3 Operations Notes:

        Servicing Mission Observatory Verification (SMOV) activities continue.

        Real-time operations transferred to Building and CCS string "G" at 
025/0030Z due to the heavy snow storm in the Goddard area.  No problems 
have been encountered.  The flight operations team has faithfully reported 
to their work stations despite the fact that most of Goddard has been 
declared closed for the 25th and the 26th.

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

        Per ROP IC-2 and an operations note, SSA transmitter #2 was turned 
on and off three times.

        The NSSC-1 status buffer was dumped at 024/1814Z, per ROP NS-3.

        The ephemeris tables were uplinked at 025/0211Z as directed by ROP 
DF-07A.

        The STIS EMC reset at 026/011936Z.  The STIS flight software error 
counter was reset at 026/0142Z as directed by ROP NS-12.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of SMOV and normal science observations and calibrations.

/CAW