Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_00/hst_status_12_07_00 Дата изменения: Thu Dec 7 14:36:34 2000 Дата индексирования: Sun Dec 23 10:18:12 2007 Кодировка: Поисковые слова: quasar

HUBBLE SPACE TELESCOPE

DAILY REPORT #2764

PERIOD COVERED: 0000Z (UTC) 12/06/00 - 0000Z (UTC) 12/07/00

Daily Status Report as of 342/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed STIS/CCD 8631 (Bright Quasar Close Lensing Search II)

The Space Telescope Imaging Spectrograph (CCD) was used to expand
the Cycle 8 second generation HST snapshot survey of bright quasars,
optimized to find lenses with component image separations < 1". The
observations completed nominally.

1.2 Completed Two Sets of WF/PC-2 8827 (Cycle 9 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 proposal completed nominally.

1.3 Completed Two Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. The proposal completed with no reported problems.

1.4 Completed WF/PC-2 7407 (Continuation of Temporal Monitoring of the
Crab Synchrotron Nebula)

The WF/PC-2 was used to observe the synchrotron nebula surrounding
the Crab pulsar that has been the subject of intensive study for
decades. It is generally accepted that the structure and activity in this
region are due to wave phenomena near the termination shock of the pulsar
wind, observations of which hold unique promise of leading to more complete
models of the pulsar and its magnetosphere. Unfortunately, this promise
has not been fulfilled, largely because of the low spatial resolution and
uneven temporal coverage of existing studies. Recent WF/PC-2 observations
of the Crab synchrotron nebula offer new hope in this quest. These data,
which reach the natural size scale defined by the Larmor radius of
energetic electrons, resolve the majority of the known features in the
Crab. For the first time it is possible to reliably establish the physical
conditions {e.g., emissivities, equipartition fields, and pressures} of
features

1.5 Completed Three Sets of WF/PC-2 8816 (Cycle 9 UV Earthflats)

The WF/PC-2 was used to obtain sequences of earth streak flats to
improve the quality of pipeline flat fields for the WFPC2 UV filter set and
in order to monitor flat field stability. There were no reported problems.

1.6 Completed STIS/CCD/MA1/MA2 8857 (MAMA Sensitivity and Focus Monitor C9)

The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was
used to monitor the sensitivity of each MAMA grating mode to detect any
change due to contamination or other causes. There were no problems.

1.7 Completed WF/PC-2 8602 (A Snapshot Survey of the Sites of Recent,
Nearby Supernovae)

The WF/PC-2 was used to conduct a snapshot survey in V and I of the
sites of the nearby SNe, which have precisely known positions, to obtain
high-resolution information on their local environment. The proposal
completed with no reported problems.

1.8 Completed STIS/CCD 8562 (Probing the Large Scale Structure: Cosmic
Shear Observations)

The Space Telescope Imaging Spectrograph (CCD) was used to probe
the distortion of light bundles from distant galaxies, looking at the
statistical properties of the intervening inhomogeneous {dark} matter
distribution. The proposal completed nominally.

1.9 Completed STIS/CCD 8838 (Bias Monitor - Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used 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 track the evolution of hot
columns. The proposal completed nominally.

1.10 Completed WF/PC-2 8660 (Saturn's Rings and Small Moons)

The Wf/PC-2 was used to investigate the composition, structure, and
particle properties of the rings from variations of ring brightness and
color with radius, tilt and phase angle, to measure the azimuthal asymmetry
of the A ring of Saturn and the temporal variability of the clumpy F ring,
to follow the enigmatic behavior of the renegade satellites Prometheus and
Pandora, and to observe the co-orbital satellites Janus and Epimetheus as
they exchange orbits in February 2002. The observations completed nominally.

1.11 Completed STIS/CCD/MA1/MA2 8206 (The Structure of the Accretion
Flow on Pre-Main-Sequence Stars)

The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was
used to test an essential prediction of the magnetospheric accretion model
for T Tauri stars. Echelle spectra were be used to search for the
relatively narrow high-temperature emission lines that must result from the
magnetospheric accretion shock, but are not expected in the previous,
alternative boundary layer model. The observations were completed with no
reported problems.

1.12 Completed WF/PC-2 8805 (POMS Test Proposal: WFII Parallel Archive
Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
WFPC2 Archival Pure Parallel program. The program will be used to take
parallel images of random areas of the sky, following the recommendations
of the Parallels Working Group. The proposal completed with no reported
problems.

1.13 Completed STIS/MA1 8843 (Cycle 9 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA1) was used to perform
the routine monitoring of the MAMA detector dark noise. The proposal
completed nominally.

1.14 Completed WF/PC-2 8701 (Multiplicity among Very-Low Mass Stars and
Brown Dwarfs in Alpha Persei and the Pleiades)

The WF/PC-2 was used to observe open clusters which provide
excellent hunting grounds for brown dwarf {BD} searches. The AlphaPer and
Pleiades clusters are young, nearby and have low extinction. They are
considered to be the best-suited places to study the Substellar Mass. A
dozen of cool faint AlphaPer and Pleiades members have been confirmed as
``bona-fide'' BDs with the lithium test. By comparison with those, about
60 very good cluster BD candidates are currently known. The Pleiades SMF
obtained using the most recent deep large CCD surveys indicates that BDs
are quite numerous but do not make a significant contribution to the total
cluster mass. The observations completed with no reported problems.

1.15 Completed STIS/CCD 8884 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal Continuation)

The Space Telescope Imaging Spectrograph (CCD) was used to take
parallel images of random areas of the sky. The proposal completed nominally.

1.16 Completed Three Sets of WF/PC-2/STIS/CCD 8641 (Testing the
Accelerating Universe)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to observe Type Ia supernovae which provide evidence for an
accelerating universe: an extraordinary result that needs to be rigorously
tested. The observations completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

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

Scheduled Re-acquisitions: 9
Successful: 9

2.2 FHST Updates:
Scheduled: 21
Successful: 21

2.3 Operations Notes:

The SSR EDAC error counter was cleared on three occasions, per ROP
SR-1A.

A TTR was written for a required re-transmit during a NSSC-1 uplink
at 341/1703Z.

As documented in HSTAR 7992, the recharge ratio for Battery #5
indicated 1.3 at 341/170352Z. The two subsequent calculations were also
out-of-limits with values of 1.30 and 1.32. At 341/204048Z, the Battery #5
temperature (CBAT5TEMP) indicated 1.03606 -- another out-of-limits
condition. Accordingly, at 341/2224Z, the K52 voltage/temperature level
was adjusted from 4 to 5. A Battery #5 heat-up contingency operations
request was executed at 341/224406Z.

SI C&DH errors were reset at 342/0426Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW