Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/hst_status_01_11_02 Дата изменения: Fri Jan 11 14:52:23 2002 Дата индексирования: Sat Dec 22 19:27:58 2007 Кодировка: Поисковые слова: magnetar

HUBBLE SPACE TELESCOPE

DAILY REPORT #3032

PERIOD COVERED: 0000Z (UTC) 01/10/02 - 0000Z (UTC) 01/11/02

Daily Status Report as of 011/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of STIS/CCD 8901 (Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. There was no anomalous activity.

1.2 Completed Five Sets of WF/PC-2 8942 (Cycle 10 Intflat Sweeps and
Linearity Test)

The WF/PC-2 was used to monitor the pixel-to-pixel flatfield
response and provide a linearity check. These intflat sequences are done
once during the year and the images will provide a backup database in the
event of complete failure of the visflat lamp as well as allow monitoring
of the gain ratios. There were no reported problems.

1.3 Completed Two Sets of WF/PC-2 8937 (Cycle 9 Supplemental Darks pt2/3)

The WF/PC-2 was used obtain three dark frames every day to provide
data for monitoring and characterizing the evolution of hot pixels. No
problems were encountered.

1.4 Completed Two Sets of STIS/CCD 9066 (Closing in on the Hydrogen
Reionization Edge of the Universe)

The Space Telescope Imaging Spectrograph (CCD) was used in parallel
constrain the Hydrogen reionization edge in emission that marks the
transition from a neutral to a fully ionized IGM at a predicted
redshifts. The proposal completed uneventfully

1.5 Completed WF/PC-2 9118 (Tracing the Cosmic Expansion to z>1 with
Type Ia Supernovae)

The WF/PC-2 was used to observe type Ia supernovae in order to
provide evidence for an accelerating universe. The case for cosmic
acceleration rests almost entirely on the observation that the observed SN
Ia at z~0.5 are 0.25 magnitudes fainter than expected for a
non-accelerating Universe. It is proposed to follow five SN Ia in the
range 0.95 J-band follow-up campaign, the proposers can expect to measure the mean
luminosity distance of the sample at z~ 1.05 to better than 5. At these
redshifts, the effect of Omega_Lambda has all but vanished and the Universe
was decelerating due to its known matter content. Because any simple
systematic error will deviate substantially from the non-monotonic effect
of a Omega_Lambda > 0 cosmology, this experiment is a powerful and
straightforward way to assess the reliability of the SN Ia
measurements. In addition, if SN Ia are reliable standard candles, the
proposed observations will significantly increase the precision with which
Omega_Lambda and Omega_M are measured. There was no reported anomalous
activity.

1.6 Completed STIS/CCD 8903 (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. There were no problems.

1.7 Completed Three Sets of STIS/CCD 9285 (POMS Test Proposal: STIS
Non-scripted Parallel Proposal Continuation III)

The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude, non-scripted parallel observations as part of a POMS
test proposal. The acquisition failure detailed in HSTAR 8468 and 2.1
occurred for the final iteration of this proposal, the take data flag
remained down and the observation for that iteration was lost. Otherwise,
the observations were completed as planned, and no further anomalies were
reported.

1.8 Completed Two Sets of STIS/MA2 8920 (Cycle 10 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA2) was used to perform
the routine monitoring of the MAMA detector dark noise, and is the primary
means of checking on health of the MAMA detectors systems through frequent
monitoring of the background count rate. The proposal completed with no
reported anomalous activity.

1.9 Completed STIS/MA1 9063 (Optical Counterparts of Isolated Neutron
Stars)

The Space Telescope Imaging Spectrograph (MA1) was used to test the
understanding of both quantum chromodynamics {QCD} and quantum
electrodynamics {QED}. Specifically, the measurement of radii of neutron
stars can test QCD at high density. This is being realized through
intensive X-ray observations of bright nearby neutron stars. However, the
natures of these important sources are not clear and to this end a simple
proper motion program is proposed as a means to obtain their ages and
potential association with star-forming regions. One of the sources is RX
J0720.4-3125 which has been argued to be an old magnetar --- a highly
magnetized neutron star --- and thanks to its high count rate is already a
choice object for X-ray missions. Magnetars, with their extreme magnetic
field strengths, are excellent laboratories for testing out some
expectation of QED. The loss-of-lock described in 2.1 and HSTAR 8463
occurred during this proposal, affecting at least some of the twelve
observations. Otherwise, there were no further reported problems.

1.10 Completed Three Sets of WF/PC-2 9318 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform the generic target version of the
WFPC2 Archival Pure Parallel program. The program was used to take
parallel images of random areas of the sky, following the recommendations
of the Parallels Working Group. The loss-of-lock described in 2.1 and
HSTAR 8463 occurred during the first iteration of this proposal, affecting
at least some of the twenty-one observations. Otherwise, there were no
further reported problems.

1.11 Completed STIS/CCD/MA1/MA2 8919 (MAMA Sensitivity and Focus
Monitor C10)

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, and also to monitor the STIS
focus in a spectroscopic and an imaging mode. All observations were
successful.

1.12 Completed WF/PC-2 9114 (SINS: The Supernova Intensive Study--
Cycle 10)

The WF/PC-2 was used to perform closer observations of supernovae
that will create the chemical history of the Universe, energize the
interstellar gas, stiffen the spine of the extragalactic distance scale and
provide the only evidence for an accelerating universe. A violent
encounter is underway between the fast-moving debris and the stationary
inner ring. Monitoring this interaction will help solve the riddles of
stellar evolution posed by the enigmatic three-ring system of SN
1987A. Our UV observations of Ly- Alpha emission reveal the present
location and velocity of a remarkable reverse shock that provides a unique
laboratory for studying fast shocks and a powerful tool for dissecting the
structure of the vanished star. No problems were encountered.

1.13 Completed WF/PC-2 9157 (Fundamental Properties Of L-Type Dwarfs In
Binaries)

The WF/PC-2 was to be used to characterize the physical properties
of eight L-dwarfs in four binary systems. The acquisition failure detailed
in HSTAR 8468 and 2.1 occurred for this proposal, the take data flag
remained down and all observations were lost.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 7
Successful: 6

Per HSTAR 8463, there was a loss-of-lock at 010/ 091059Z following
a successful acquisition at 010/085157Z. The proposals detailed in 1.9 and
1.10 were affected.

The acquisition at 010/201325Z failed when the search radius limit
was exceeded on FGS-3. The following re-acquisition, however, was
successful. HSTAR 8468 was written. The proposals described in 1.7 and
1.13 were affected.

The re-acquisition at 011/011120Z succeeded on the fourth
attempt. HSTAR 8469 was written. There was no impact to science.
Scheduled Re-acquisitions: 10
Successful: 10

2.2 FHST Updates:
Scheduled: 12
Successful: 12

2.3 Operations Notes:

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

The NSSC-1 flight software (FSW) 7.5.3 patch installation was
successfully loaded at 010/163053Z. During the period of installation and
checkout, neither the NSSC-1 application processors for the NCS nor the
COSTAR were active.

The 486 engineering status buffer limits were adjusted at 010/2044Z
per ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW