Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_99/hst_status_05_14_99 Дата изменения: Fri May 14 14:41:03 1999 Дата индексирования: Sun Dec 23 11:02:16 2007 Кодировка: Поисковые слова: virgo cluster

HUBBLE SPACE TELESCOPE

DAILY REPORT #2372

PERIOD COVERED: 0000Z (UTC) 05/13/99 - 0000Z (UTC) 05/14/99

Daily Status Report as of 134/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 7281 (Snapshot Survey of the B2 Sample
of Radio Galaxies)

The WF/PC-2 was used to make snapshot survey observations of the B2
sample radio galaxies B2+1512+30 and B2+1557+26. This program is aimed to
answer the following key questions: How common are extended nuclear disks?
What is their orientation and morphology? How common are optical jets?
The observations were executed as scheduled, and no anomalies were noted.

1.2 Completed STIS/CCD 7949 (CCD Dark and Bias Monitor -- Cont. to June 99)

The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program. It was also scheduled
to track the growth of hot pixels on the CCD in general and within the
various target acquisition apertures specifically. The observations were
executed as scheduled, and no anomalies were noted.

1.3 Completed Two Sets of WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental
Darks pt3/3)

The WF/PC-2 was used to make supplemental dark calibration images.
This dark calibration program obtains 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 anomalies were noted.

1.4 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as
Cosmological Tools)

The WF/PC-2 was used to make survey observations of object
MG0751+271 by obtaining deep, high-resolution images in the optical and
near IR in order to see if it is gravitational lensed and could be used as
a cosmological tool. The observations were executed as scheduled, and no
anomalies were noted.

1.5 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements. A variety of internal exposures are obtained in
order to provide a monitor of the integrity of the CCD camera electronics
in both bays {gain 7 and gain 15}, a test for quantum efficiency in the
CCDs, and a monitor for possible buildup of contaminants on the CCD
windows. A bias calibration and an internal flat calibration image were
also taken. The observations were executed as scheduled, and no anomalies
were noted.

1.6 Completed WF/PC-2 7409 (Resolving sdB Binary Systems)

The WF/PC-2 was used to make observations to try to resolve the sdB
class binary system Star-15122. This is a continuation of the approved
Cycle 6 Proposal No. 6351, which due to unlucky circumstances did not
succeed in obtaining any data until 8/30/96. The observations were
completed as scheduled, and no anomalies were reported.

1.7 Completed STIS/MA1/MA2 8201 (Ultra-luminous Infrared Galaxies)

The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to
make ultraviolet observations of the ultra-luminous infrared galaxy
IRAS13428. Ultra-luminous Infrared Galaxies are the most luminous galaxies
known in the local universe, and are predominantly powered by massive star
formation. The observations were executed as scheduled, and no anomalies
were noted.

1.8 Completed 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 low 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 7306 (Halo Microlens Source Systems and their
Underlying Stellar Backgrounds)

The WF/PC-2 was to be used to to obtain medium-deep broadband images
of source STAR-0517 looking for microlensing events, plus one additional
star, to determine a} which star was actually lensed, b} the amount of
crowding in our ground-based frames, c} if the stars are normal in the CMD,
and d} if they lie preferentially at the back of the LMC. As explained in
2.1, 2.2 and HSTAR 7128, the full maneuver updates and the acquisition
before this proposal failed, affecting six observations as the take data
flag remained down.

1.10 Completed Five 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 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. As explained in 2.1, 2.2 and HSTAR 7128,
the full maneuver updates and the acquisition before the first iteration of
this proposal failed, affecting one observation as the take data flag
remained down. Otherwise, the observations were completed as scheduled,
and no further anomalies were reported.

1.11 Completed STIS/CCD 8470 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal Continuation V)

The Space Telescope Imaging Spectrograph (CCD) was to be 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 VI proposal. As explained in 2.1, 2.2 and
HSTAR 7128, the full maneuver updates and the acquisition before this
proposal failed, affecting one observation as the take data flag remained
down.

1.12 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.

1.13 Completed WF/PC-2 6798 (The Early Evolution of Local Group Dwarf
Irregular Galaxies)

The WF/PC-2 was used to determine whether the gas-containing dwarf
irregular galaxy know as WLM in the Local Group has significant population
of very ancient stars of age comparable to Population II stars in the
Galaxy, and if so, whether the properties of this old population vary with
the parent galaxy type. The proposal completed with no reported problems.

1.14 Completed Two Sets of STIS/CCD 7912 (STIS Parallel Archive Proposal
- Nearby Galaxies - Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies. This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies. These data will be placed immediately into the Hubble Data
Archive. The observations were completed as scheduled, and no problems
were reported.

2.0 FLIGHT OPERATIONS SUMMARY

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 5
Successful : 4

Per HSTAR 7128, following two full maneuver update failures the
acquisition at 133/105500Z failed when the search radius limit was exceeded
on FGS-3. The proposals described in 1.9, 1.10, and 1.11 were affected by
these failures.

Scheduled Reacquisitions : 7
Successful : 7

2.2 FHST Updates:

Scheduled : 13
Successful : 10

Per HSTAR 7128, the full maneuver updates at 133/102058Z and at
133/102343Z failed, causing the following acquisition to fail.

The roll delay update at 133/150403Z failed due to FHST-3. The
attitude was good, the HST was still on guide stars, and the full maneuver
updates following were successful.

2.3 Operations Notes:

The operations team continues its residence in the SAMS back-up
facility using the PRS ground system.

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

An SI C&DH error was reset at 133/2106Z per ROP NS-5.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH