Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_99/hst_status_07_01_99 Дата изменения: Thu Jul 1 14:50:26 1999 Дата индексирования: Sun Dec 23 11:03:11 2007 Кодировка: Поисковые слова: virgo cluster

HUBBLE SPACE TELESCOPE

DAILY REPORT #2405

PERIOD COVERED: 0000Z (UTC) 06/30/99 - 0000Z (UTC) 07/01/99

Daily Status Report as of 182/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 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.

1.2 Completed Two Sets of WF/PC-2 6364 (Snapshot Survey of Proto-Planetary
Nebulae and AGB Stars)

The WF/PC-2 was used to make some snapshot survey observations of
protoplanetary nebular systems IRAS00210 and OH44.8-2.3 to study their
circumstellar envelopes. The purpose is to discern the evolutionary sequence
that produces axially-symmetric planetary nebulae. The observations were
executed as scheduled, and no anomalies were noted.

1.3 Completed 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.

1.4 Completed WF/PC-2 6967 (Blue Continuum Snapshots of 3CR Radio -
Continued Galaxies)

The WF/PC-2 was used to make observations of the radio galaxy 3C458.0.
Radio galaxies are an important class of extragalactic objects: they represent
one of the most energetic astrophysical phenomena and they may be used as
probes of their environments. They are unique probes of the early Universe.
The observations were completed as planned, and no problems were reported.

1.5 Completed Two Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

The Space Telescope Imaging Spectrograph (CCD) was used to make Low
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.

1.6 Completed WF/PC-2 8328 (HST Astrometry to Gauge the Distance of
PSR0833-45 {VELA} and PSR0656+14)

The WF/PC-2 was used to make astrometric observations of the reference
star STAR-0825 in order study the distance of PSR0833-45 {VELA} and
PSR0656+14. High angular resolution, coupled with sensitivity, makes HST the
ideal instrument to measure tiny displacements of faint objects, such as those
due to proper motions and annual parallaxes of Isolated Neutron Stars. The
observations were executed as scheduled, and no anomalies were noted.

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

The WF/PC-2 was used to make observations of supernova SN1998S.
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.

1.8 Completed Two Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II Parallel
Archive Proposal Continuation)

The WF/PC-2 was used in the parallel mode to make some high galactic
latitude archive observations. The program will be used to take parallel
images of random areas of the sky. The observations were executed as
scheduled, and no anomalies were noted.

1.9 Completed WF/PC-2 6833 (A Cepheid Search in the Virgo Cluster Galaxy NGC
4571)

The WF/PC-2 was used to make observations of the Virgo Cluster galaxy
NGC-4571 in order to search for Cepheid variable stars. The determination of
the distance to the Virgo Cluster is key to establishing the value of the
H_zero. The observations were completed as planned, and no problems were
reported.

1.10 Completed FGS 8105 (Global Change on Pluto?)

The Fine Guidance Sensors were used to make astrometric observations of
the planet Pluto and several other reference stars. Pluto and Triton, two
bodies that likely formed in the solar nebula {rather than a pre-planetary
nebula}, hold the promise of telling us much about early conditions in the
outer solar system. The observations were completed as planned, and no
anomalies were reported.

1.11 Completed Two Sets of WF/PC-2 6359 (Core Properties of the Bulges of
Spiral Galaxies)

The WF/PC-2 was used to make snapshot survey observations of spiral
galaxies IC5273 and NGC-1258 in order to study their central bulges. The aim
is to investigate the core properties, correlations with global galactic
properties, and the frequency of occurrence of multiple and/or miscentered
nuclei. The observations were completed as scheduled, and no anomalies were
noted.

1.12 Completed WF/PC-2 6362 (Supernova Host Galaxy)

The WF/PC-2 was used to make observations of the supernova host galaxy
Gal-230434. The observations were executed as scheduled, and no anomalies were
noted.

1.13 Completed WF/PC-2 6363 (The Environments and Host Galaxies of BL-Lac
Objects)

The WF/PC-2 was used to make snapshot survey observations of BL-Lac
object PKS0118-27 in order to study its environment and its host galaxy. The
goal is to investigate systematic trends in host galaxy type, unusual
morphological features, nearby companion galaxies, etc. The observations were
executed as scheduled, and no anomalies were noted.

1.14 Completed Two Sets of FOC/96 6349 (Snapshot Search for High Redshift
QSOs with Far-UV Flux)

The Faint Object Camera (f/96) was used to make snapshot images of the
quasi-stellar objects Q-146-537 and Q0041-261. This is to determine if these
high redshifted objects have a far ultraviolet flux. The observations were
executed as scheduled, and no anomalies were noted.

1.15 Completed FOC/96 6350 (FOC Spectroscopy of BALQSOs)

The Faint Object Camera (f/96) was used to make ultraviolet
spectrographic images of BALQSO 2359-12 which is known to show broad emission
lines from abundant ions. This will help us improve our knowledge of these BAL
class objects. The observations were executed as scheduled, and no anomalies
were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 14
Successful : 13

According to HSTAR 7187, the acquisition at 182/0355602Z failed to RGA
control when the scan step limit was exceeded on FGS-3. Two proposals (STIS
8409 and WF/PC-2 6357), occurring during the period of the next report, were
affected.

Scheduled Reacquisitions : 4
Successful : 4

2.2 FHST Updates:

Scheduled : 33
Successful : 33

2.3 Operations Notes:

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

The WF/PC-2 microprocessor was dumped at 181/1959Z and at 182/0117Z per
ROP NS-4.

The STIS MCE-2 reset at 181/1995549Z while the low voltage was on and
while in an SAA interval. The STIS flight software error counter was reset at
181/2007Z as directed by ROP NS-12. The MAMA-2 was recovered via normal SMS
commanding at the time of a high voltage turn-on.

A TTR was written for numerous MA return dropouts and SSA forward loss
due to the STGT timing system power supply. A total of 24-minutes, 16-seconds
of 32k engineering data was irretrievably lost.

SMGT SR3, Part 3A, will be running all day today.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH