Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_97/hst_status_08_15_97 Дата изменения: Fri Aug 15 19:08:00 1997 Дата индексирования: Sun Dec 23 10:51:23 2007 Кодировка: Поисковые слова: m 31

HUBBLE SPACE TELESCOPE

DAILY REPORT #1942

PERIOD COVERED: 0000Z (UTC) 08/14/97 - 0000Z (UTC) 08/15/97

Daily Status Report as of 227/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

The WF/PC-2 was used to make supplemental dark calibration images.
This set of calibrations is intended to obtain three dark frames every day
to provide data for monitoring and characterizing the evolution of hot
pixels. The observations were executed as scheduled, and no anomalies were
noted.

1.2 Completed STIS/CCD 7659 (Daily Darks to Update Acquisition Bad Pixel
Table)

The Space Telescope Imaging Spectrograph (CCD) was used to make dark
calibration images in order to update the acquisition bad pixel table.
Daily hot pixel lists can also be used for science data analysis. The
observations were executed as scheduled, and no anomalies were noted.

1.3 Completed Three Sets of STIS/CCD 7601 (CCD Dark and Bias Monitor)

The Space Telescope Imaging Spectrograph (CCD) was used to conduct
bias and dark monitoring. Also, observations were made to track the growth
of hot pixels on the CCD in general and within the various target
acquisition apertures specifically. The observations were completed as
planned, and no anomalies were reported.

1.4 Completed Three Sets of NIC/2 7420 (A Near-Infrared Search for Very
Low Mass Companions to Stars Within 10 Parsecs of the Sun)

The Near Infrared Camera (Camera Two) was used to make searching
observations for very low mass companions to variable stars HD10700,
HD165222 and FN-Vir. These stars are known to be within 10 parsecs of the
Sun. The observations were executed as scheduled, and no anomalies were
noted.

1.5 Completed Two Sets of NIC/2 7331 (Near-IR Properties of the Bulges
of Spiral Galaxies)

The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxies NGC-7013 and NGC-4980.
Near-IR data at HST resolution are essential for correcting for the effect
of dust and will enable us to derive robust nuclear properties for the
sample. The observations were executed as scheduled, and no anomalies were
noted.

1.6 Completed NIC/2 7366 (Intense Galactic X-ray Sources in Crowded Fields)

The Near-Infrared Camera (Camera Two) was used to make observations
of the intense galactic x-ray, variable, binary, low mass star
NP-Serpentis. This source lies in a severely optically crowded field, and
there is strong evidence that past work has been deceived by spurious
superpositions of unrelated objects. The observations were executed as
scheduled, and no anomalies were noted.

1.7 Completed WF/PC-2 6659 (A Search For Superplanets Around Weak
T-Tauri Stars)

The WF/PC-2 was used to make observations in the 1 micron band of
the T-Tauri class star HBC633 in order to search for superplanets. Weak
T-Tauri class stars are thought to have dissipated their circumstellar
disks recently, possibly by forming planetary systems. The observations
were completed as planned, and no anomalies were reported.

1.8 Completed WF/PC-2 6905 (WF/PC-2 Cycle 6 Calibration: Internal Monitor)

The WF/PC-2 was used to make several internal calibration
observations including biases and internal flats as part of a Cycle 6
calibration procedure. A variety of internal exposures are run weekly to
verify and monitor the health of the camera. The observations were
executed as scheduled, and no anomalies were noted.

1.9 Completed Two Sets of WF/PC-2/NIC/2 6859 (Stellar Populations in the
M-31 Disk)

The WF/PC-2 was used to make observations of the inner (i.e., 6
kpcs) and outer (i.e., 25 kpcs) regions of the Andromeda Galaxy (a.k.a.,
M-31) in order to study its stellar populations. The ability to observe
faint stars will allow us to disentangle the effects of age and metallicity
on the location and spread of the giant branch because if younger stars are
present, one will be able to see the upper main sequence. During the
second iteration of this proposal, at 226/1128Z, the acquisition defaulted
to fine lock on one FGS only. HSTAR 6151 was written. No effects on any
science was noted. Otherwise, the observations were completed as planned,
and no further problems were reported.

1.10 Completed Three Sets of STIS/CCD 7781 (STIS Non-Scripted Parallel
Archive Proposal - Full Orbit)

The Space Telescope Imaging Spectrograph (CCD) was used for a
non-scripted parallel archive proposal (one full orbit). During the second
iteration of this proposal, the acquisition default described in 1.9
occurred with no scientific impact being reported. Otherwise, the
observations were executed as scheduled, and no further anomalous activity
was noted.

1.11 Completed NIC/1/2/3 7328 (High Resolution IR Imaging Survey (IRIS)
of the Centers of the Nearest Active Galaxies)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make high resolution infrared observations of the nearest active Markarian
galaxy in order to study its inner nuclear region. Observing in the
near-IR minimizes the dust obstruction and maximizes sensitivity to the old
stellar population which dominates the mass. The observations were
executed as scheduled, and no anomalies were noted.

1.12 Completed NIC/1/2/3 7412 (An HST/NICMOS Search for Young Brown
Dwarfs and Giant Planets)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations taken in parallel with the prime science observations to
be part of a survey to look for large planets and/or small brown dwarf
stars which are in orbit around T-Tauri class stars. At an age of 2 to 20
million years these low-mass companions will be considerably brighter than
more evolved brown dwarfs or giant planets orbiting main-sequence stars,
and hence will be much easier to detect. The observations were completed
as planned, and no anomalies were noted.

1.13 Completed NIC/1/2/3 7447 (The Cosmological Evolution of Quasar Host
Galaxies)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of galaxy SGP2-47 as part of a survey to study the
cosmological evolution of galaxies which host quasars. Other point spread
function observations were taken to test the calibration of the cameras.
The observations were executed as scheduled, and no anomalies were noted.

1.14 Completed STIS/CCD 7782 (STIS Non-Scripted Parallel Archive
Proposal - Half Orbit)

The Space Telescope Imaging Spectrograph (CCD) was used for a
non-scripted parallel archive proposal (one-half orbit). The observations
were executed as scheduled, and no anomalies were noted.

1.15 Completed NIC/2 7338 (A Study of the Gravitational Lensing
Potential in MG 0414+0534)

The Near Infrared Camera (Camera Two) was used to make observations
of the quadruple gravitational lens system MG0414+0534 in order to search
for new gravitational lensing effects. It is intend to determine whether
the primary lens galaxy and its dark halo are sufficient to explain the
observed lensing geometry or whether there are significant external tidal
perturbations. The observations were completed as scheduled, and no
anomalies were reported.

1.16 Completed WF/PC-2 6872 (Morphology of the Active Nucleus and Radial
Filaments of NGC 1808)

The WF/PC-2 was used to make high resolution observations of the
galactic core of NGC-1808 in order to resolve questions as to the nature of
it's energetic core "hot spots" variously attributed to unusual
circumnuclear starburst activity, massive supernova remnants or black hole
accretion disk models. The observations were completed as scheduled, and
no anomalies were reported.

1.17 Completed NIC/1/2/3 7729 (NICMOS Short One Orbit Parallel)

The Near Infrared Camera (Cameras One, Two, and Three) was used to
obtain "JHK" imaging of sky regions while another instrument was prime.
These observations were part of the short NICMOS one-orbit parallel
program. 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 : 14

As described in 1.9, one acquisition defaulted to control on one FGS
only. The proposal described in 1.10 may also have been affected.

Scheduled Reacquisitions : 4
Successful : 4

2.2 FHST Updates:

Scheduled : 17
Successful : 17


2.3 Operations Notes:

On August 13 at 14:45 GMT, the KRSWCC (K-Relay Software Charge
Control) Test was activated. The purpose of the test was to verify that
the KRSWCC algorithm functions as designed and observe battery thermal
stability when charging to higher voltage levels. KRSWCC's logic performed
as expected. However,as a result of the additional energy being applied to
the batteries, Battery 3 temperature reached 3 degees C at approximately
08:00 GMT, August 14. Subsequently, at 13:31 GMT, Battery 5 temperature
exceeded 3 degees C. Nominally, the battery temperatures range from
approximately -4 to 0 degrees C. In an attempt to decrease the battery
temperatures, the K62 Voltage/Temperature level was changed from 2 to 3.
However, this was not successful in lowering the temperatures. The test
was terminated at 16:35 on the 14th. The vehicle is currently running
under normal operational hardware charge control and the battery
temperatures have returned to nominal operating temperatures.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH