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HUBBLE SPACE TELESCOPE

DAILY REPORT #2432

PERIOD COVERED: 0000Z (UTC) 08/09/99 - 0000Z (UTC) 08/10/99

Daily Status Report as of 222/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 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.

1.2 Completed Five 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.

1.3 Completed STIS/CCD 8313 (Imaging the Host Galaxies of High Redshift Type
Ia Supernovae)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of 9624 and its host galaxy. The propose is to obtain snapshot,
unfiltered STIS images of distant galaxies of known redshift which have hosted
supernovae {SNe} of Type IA found via the Supernova Cosmology Project. The
observations were completed as scheduled, and no anomalies were reported.

1.4 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.

1.5 Completed STIS/CCD 8042 (UV Imaging and Spectroscopy of High Excitation
Herbig-Haro Objects)

The Space Telescope Imaging Spectrograph (CCD) was used to make
ultraviolet images and spectrographic observations of the high excitation
Herbig-Haro object HD-163296. A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

1.6 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 Reipurth-4 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.

1.7 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.

1.8 Completed Two Sets of STIS/CCD 8202 (Bright Quasar Close Lensing Search)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ2150-3 and HCLQ1304+4 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.

1.9 Completed WF/PC-2 8310 (White Dwarf Distances to Globular Clusters and
the RR-Lyrae Luminosity Calibration M-5.)

The WF/PC-2 was used to make observations of NGC-5904 (a.k.a., M-5) in
order to study its white dwarf and RR-Lyrae class starts. Despite the efforts
of Hipparcos, the RR-Lyrae absolute magnitude calibration, M_V{RR}, remains
uncertain at a level which critically compromises these stars' use as standard
candles. The observations were executed as scheduled, and no anomalies were
noted.

1.10 Completed STIS/CCD 7438 (Spatially-Resolved Spectroscopy of the UVX in
Elliptical Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to make
spatially resolved far-ultraviolet observations of the large elliptical galaxy
NGC-221. The prominent far-UV upturn {UVX} in the spectra of elliptical
galaxies originates from stars in their old populations which have evolved
beyond the He-flash at the tip of the red giant branch. A wavelength
calibration image and a bias measurement were also taken. The observations
were completed as scheduled, and no anomalies were reported.

1.11 Completed WF/PC-2 8441 (WF/PC-2 Decontaminations and Associated
Observations Pt. 1/2)
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The WF/PC-2 was used to make its monthly decontamination operations.
Also included are instrument monitors tied to decons: photometric stability
check, focus monitor, pre- and post-decon internals {bias, internal flats,
k-spots, and darks}, and ultraviolet throughput checks. The observations were
executed as scheduled, and no anomalies were noted.

1.12 Completed STIS/CCD 8271 (A Snapshot Survey of LMC Planetary Nebulae: A
Study of Nebular and Late Stellar Evolution)

The Space Telescope Imaging Spectrograph (CCD) was used to make
medium-resolution slitless spectroscopy snapshot images of the planetary
nebulae LMC-SMP-18 located in the Large Magellanic Cloud to study the parallel
evolution of the nebulae and its central star. The observations were completed
as planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 12
Successful : 12

Scheduled Reacquisitions : 6
Successful : 6

2.2 FHST Updates:

Scheduled : 25
Successful : 25

2.3 Operations Notes:

HST operations continues to operate from the SAMS backup facility.
Plans are to return to the STOCC area upon the conclusion of Joint Integrated
Simulation #4 (Planning/EVA-3) late this afternoon.

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

STIS MCE-1 reset at 222/035109Z while the low voltage was on and while
outside any SAA interval. ROP NS-12 was executed at 222/0517Z to reset the
STIS flight software error counter. MAMA-1 was recovered via normal SMS
commanding at 222/0958Z, the next time the high voltage was turned on.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH