Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_98/hst_status_09_15_98 Дата изменения: Tue Sep 15 15:20:16 1998 Дата индексирования: Sun Dec 23 10:57:58 2007 Кодировка: Поисковые слова: m 31

HUBBLE SPACE TELESCOPE

DAILY REPORT #2208

PERIOD COVERED: 0000Z (UTC) 09/14/98 - 0000Z (UTC) 09/15/98

Daily Status Report as of 258/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks. 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 executed as scheduled, and no
anomalies were noted.

1.2 Completed Two Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

The Space Telescope Imaging Spectrograph (CCD) was used to measure
CCD dark current and bias rates for the two supported amplifier settings
{GAIN=1 and GAIN=4} in order to gather data for making superdarks and
superbiases. The data will be used 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 Three Sets of NIC/2 7441 (A Search for Zodiacal Dust
around Bright Nearby Stars)

The Near Infrared Camera (Camera Two) was used to make observations
of the zodiacal lights around the bright nearby stars Altair and Tau-Cet.
Dust particles around a main sequence star are quickly removed by
Poynting-Robertson drag, therefore, the existence of such dust is an almost
certain signature of a current presence of a population of larger bodies in
orbit around the star. The observations were executed as scheduled, and no
anomalies were noted.

1.4 Completed Five Sets of WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images. This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels. The observations were executed as scheduled, and no anomalies were
noted.

1.5 Completed WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination)

The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure.
Ultraviolet-blocking contaminants were removed, and hot pixels cured, by
warming the CCDs to +20C for 6 hours. A variety of internal images were
taken before and after the decontamination in order to verify its success
and to monitor the instrument health. The procedures were conducted as
scheduled, and no problems were reported.

1.6 Completed NIC/2 7894 (Completing A Near-Infrared Search for Very Low
Mass Companions to Stars within 10 pc)

The Near Infrared Camera (Camera Two) was used to make observations
searching for very low mass (VLM) companions to the star HD131156. This
search will be the largest, most sensitive, volume-limited search for VLM
companions ever undertaken. The observations were completed as planned,
and no anomalies were reported.

1.7 Completed NIC/1/2/3 7886 (NICMOS Snap Shot Survey of Early-Type
Galaxies)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the early-type galaxy NGC-5845 as part of a snap-shot
broad-band imaging survey. Since almost all early-type galaxies harbor
dust, these images which are less sensitive to extinction and will provide
superior light profiles for dynamical studies of the cores of these
galaxies. The observations were completed as scheduled, and no problems
were reported.

1.8 Completed Three Sets of STIS/MA1/MA2 7950 (Cycle 7 MAMA Dark
Measurements)

The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to
make a dark calibration image. This is to establish if the detectors are
performing nominally, that no internal movement of the MCP has taken place,
and establish dark level in orbit for a given operating temperature. These
darks will be used in later image reduction and also trended over
instrument life time as indicators of detector degradation or damage. The
observations were completed as planned, and no problems were reported.

1.9 Completed Two Sets of STIS/MA1 7439 (H-Lyman Alpha Emission from the
Upper Atmosphere of Uranus)

The Space Telescope Imaging Spectrograph (MA1) was used to make
H-Lyman Alpha observations of the emissions from the upper atmosphere of
the planet Uranus. An excess of H-Lyman Alpha emission from Uranus' sunlit
hemisphere has been detected by the IUE satellite since 1982, and some
excess was confirmed with the Voyager 2 UVS during the 1986 encounter with
Uranus. The observations were executed as scheduled, and no anomalies were
noted.

1.10 Completed WF/PC-2 6651 (WLR Distances from Accurate Multi-Color
WF/PC-2 Photometry of A & B Supergiants in M-31 and M-33)

The WF/PC-2 was used to make multi-color photometric observations of
NGC-598 (a.k.a., M-33). This is to study A and B supergiant stars in M-31
and M-33 with a precision far exceeding that of existing ground-based
estimates. The observations were completed as planned, and no problems
were reported.

1.11 Completed Three Sets of NIC/2/3 8082 (NICMOS pure parallel Fall 98)

The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel observations while another instrument is prime. The
observations were executed as scheduled, and no anomalies were noted.

1.12 Completed Six Sets of STIS/CCD 8062 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations take in parallel with the prime science
observations. The observations were completed as planned, and no problems
were reported.

1.13 Completed NIC/2 7226 (Search for Massive Jupiters)

The Near Infrared Camera (Camera Two) was used to make a corographic
search for massive planets around nearby, young main sequence stars.
Because of the extreme youth of these objects, any low-mass brown dwarf and
planetary companions will still be in a higher luminosity phase and thus
easily detectable. A dark calibration image was also taken. The
observations were executed as scheduled, and no anomalies were noted.

1.14 Completed WF/PC-2 7909 (POMS Test Proposal: WF II Parallel Archive
Proposal)

The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal. This test proposal is designed to simulate scientific
plans. The observations were completed as planned, and no problems were
reported.

1.15 Completed WF/PC-2 6619 (High Resolution Images of QSO Lyman Alpha
Absorbing Galaxies)

The WF/PC-2 was used to make several images of galaxy field (Field
0047) in order to obtain high resolution observations of the Lyman Alpha
absorbing galaxies within this field-of-view. The purpose is to directly
identify the objects responsible for low and intermediate redshift QSO
Lyman-Alpha systems. The observations were executed as scheduled, and no
anomalies were noted.

1.16 Completed NIC/2/3 8063 (NICMOS Pure Parallel Sponge - Backup)

The Near Infrared Camera (Cameras Two and Three) was used to make
observations taken in parallel with the prime science observations. This
proposal is PRE-the new FOM default. The observations were executed as
scheduled, and no anomalies were noted.

1.17 Completed FOC/96 7347 (Direct Imaging of Betelgeuse)

The Faint Object Camera (f/96) was used to make observations of the
super giant star Betelgeuse (a.k.a., HD39801 or Alpha Orionis). Our UV
images of Alpha Orionis obtained with the FOC in 1995 {Cycle 5} are the
first direct images of the surface of a star other than the Sun. The
observations were completed as planned, and no anomalies were reported.

1.18 Completed NIC/2 7329 (The Nature of the Damped LyAlpha Absorbers --
A New Study of Young Galaxies)

The Near Infrared Camera (Cameras Two) was used to make observations
of the young galaxy PSS1435+30 in order to study the nature of its damped
Lyman-Alpha Absorbers (DLAs). The DLA line systems, occasionally found in
quasar spectra, provide one of only a few practical methods of detecting
and studying significant numbers of galaxies at high redshifts. 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

The acquisition scheduled for 258/075152Z failed due to a walkdown
failure on FGS-3. HSTAR 6674 was written. NICMOS proposal 7898, which will
be described in tomorrow's report, was affected.

Scheduled Reacquisitions : 3
Successful : 3

2.2 FHST Updates:

Scheduled : 31
Successful : 28

Per HSTAR 6668, the full maneuver updates at 257/113419Z and
257/113704Z failed due to FHST-3. The following acquisition was
successful, and a map taken at 257/124300Z showed good attitude.

As described in HSTAR 6669, the roll delay update scheduled at
257/131620Z failed due to FHST-3. There had been no attitude change since
the event described in the previous HSTAR. Following a type 2 slew at
257/131633Z, both full maneuver updates and an acquisition were successful.

2.3 Operations Notes:

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

The HST IP operated as the prime system from approximately 257/1200Z
through approximately 257/2000Z. This will occur every day this week.

There was a NICMOS single bit error at 258/032156Z. The error log
was dumped at 258/0635Z, when the limit was also reset to 14.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH