HUBBLE SPACE TELESCOPE

       DAILY REPORT #2494

PERIOD COVERED:  0000Z (UTC) 11/04/99 - 0000Z (UTC) 11/05/99

Daily Status Report as of 309/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed STIS/MA1 8211 (An Ultraviolet Census of Counterparts to 
Highly Luminous X-ray Sources in M31 Globular)

        The Space Telescope Imaging Spectrograph (MA1) was used to make 
ultraviolet observations of highly luminous x-ray sources in globular 
clusters in the Andromeda galaxy (a.k.a., NGC-224).  The cores of certain 
globular clusters in our Galaxy contain some of the most extraordinary 
stars known, identified by their intense, near-Eddington limited X-ray 
emission.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.2 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.

    1.3 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.

    1.4 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.

    1.5 Completed WF/PC-2 8330 (High Resolution Imagery of Selected 
Symbiotic Stars)

        The WF/PC-2 was used to make high resolution observations of the 
variable symbiotic star CH-Cyg.  A fuller understanding of the symbiotic 
star phenomenon is important to several branches of astrophysics including 
mass loss, accretion onto compact objects, and photoionization and 
radiative transfer in gaseous nebulae.  The observations were completed as 
scheduled, and no problems were reported.

    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 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.

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

        The Space Telescope Imaging Spectrograph (CCD) was used to make low 
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 Two Sets of STIS/CCD 8411 (STIS CCD Spectroscopic Flats C-8)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
CCD flats in the spectroscopic mode.  The observations were completed as 
scheduled, and no anomalies were reported.

    1.10 Completed WF/PC-2 8307 (Morphology of High Radio Surface 
Brightness Planetary Nebulae)

        The WF/PC-2 was used to make observations of the high radio surface 
of the planetary nebula PK071-02D1.  The morphological transformation from 
the spherically symmetric circumstellar envelopes of AGB stars to the 
complex, bipolar structures of planetary nebulae has remained one of the 
major unresolved problems in the late stages of stellar evolution.  The 
observations were completed as planned, and no problems were reported.

    1.11 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ0003-2 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.

    1.12 Completed WF/PC-2/STIS/CCD/MA2 7334 (The Primordial Abundance of 
Deuterium From a Metal-Poor Damped Lyman Alpha System)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD and 
MA1) were used to make observations of the quasar Q2206-1956 to study the 
primordial abundance of deuterium from a metal-poor damped Lyman-Alpha 
system.  It should be possible to detect D absorption in many Lyman series 
lines and the chance of contamination by interloper H clouds is reduced by 
a factor of > 150.  A wave length calibration image was also taken.  As 
described in 2.1 and HSTAR 7339, the acquisition for this proposal failed, 
the take data flag remained down, and two STIS observations and one WF/PC-2 
observation were affected.  Otherwise, the remaining observations were 
executed as scheduled, and no further anomalies were noted.

    1.13 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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  8
Successful:  7

        As documented in HSTAR 7339, the acquisition scheduled for 
308/1621Z failed to RGA control when the search radius limit was exceeded 
on FGS-3.  An FHST map showed a high attitude error in the V3 axis.  An 
ARU/PRT was executed at 308/174927Z, saving the following re-acquisitions 
and the remainder of the proposal described in 1.12.

        Per HSTAR 7341, the acquisition at 309/070013Z defaulted to fine 
lock back-up on FGS-3 only.  Two proposals, STIS 8104 and WF/PC-2 8090, 
occurring during the period of the next report, may have been affected.
  Scheduled Re-acquisitions:  8
Successful:  8

    2.2 FHST Updates:
Scheduled: 22
Successful: 21

        HSTAR 7340 was written for a failed FHST roll update which failed 
at 308/233938Z due to FHST-1.  Subsequent full maneuver updates were 
successful.

    2.3 Operations Notes:

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

        Due to the acquisition failure described in 2.1 and HSTAR 7339, it 
was necessary to execute ROP NS-12 to reset the STIS flight software error 
counter at 308/1701Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW