Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_01/hst_status_06_15_01 Дата изменения: Fri Jun 15 14:56:33 2001 Дата индексирования: Sun Dec 23 10:20:57 2007 Кодировка:

HUBBLE SPACE TELESCOPE

DAILY REPORT #2894

PERIOD COVERED: 0000Z (UTC) 06/14/01 - 0000Z (UTC) 06/15/01

Daily Status Report as of 166/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 8828 (Cycle 9 Supplemental Darks pt3/3)

The WF/PC-2 was used to obtain three dark frames every day to
provide data for monitoring and characterizing the evolution of hot
pixels. The proposal completed with no reported problems.

1.2 Completed WF/PC-2 8581 (A Search For Low-Mass Companions To
Ultracool Dwarfs)

The WF/PC-2 was used to search for very low-mass {VLM} companions
to a complete sample of 120 late-M and L dwarfs, drawn mainly from the
2MASS and SDSS surveys. The primary goal is to determine the multiplicity
of M < 0.1 M_odot dwarfs. In particular, we aim to identify binary systems
suitable for long-term astrometric monitoring and mass measurement, and
systems with cool, sub-1000K companions. The proposal completed with no
reported problems.

1.3 Completed WF/PC-2 8592 (Pixel Microlensing of M87)

The WF/PC-2 was used to undertake a pixel microlensing study of M87
in order to: 1} probe the lower end of the M87 IMF via star-star lensing,
2} possibly obtain the first evidence of Massive Compact Objects (MACHOs)
in the halo of a galaxy other than our own, and 3} search for intracluster
MACHOs. The proposal completed nominally.

1.4 Completed WF/PC-2 8602 (A Snapshot Survey of the Sites of Recent,
Nearby Supernovae)

The WF/PC-2 was used to conduct a snapshot survey in V and I of the
sites of the nearby SNe, which have precisely known positions, to obtain
high-resolution information on their local environment. The proposal
completed with no reported problems.

1.5 Completed WF/PC-2 9133 (Imaging of Gravitational Lenses)

The WF/PC-2 was used to observe gravitational lenses that offer
unique opportunities to study cosmology, galactic structure, galaxy
evolution, quasar hosts and extinction. They are also the only sample of
galaxies selected on the basis of their mass rather than their luminosity
or surface brightness. While gravitational lenses can be discovered with
ground-based optical and radio observatories, converting them from
curiosities into scientific tools requires HST. There were no reported
anomalies.

1.6 Completed WF/PC-2 8632 (A UV Atlas of Nearby Galaxies)

The WF/PC-2 was used to perform a snapshot survey of local galaxies
at UV wavelengths with the F300W filter. The aim of the project is to
build a reference UV Atlas of normal galaxies, whose optical images are
well known, with the highest possible degree of information, covering all
the morphological types and luminosity classes. The proposal completed
normally.

1.7 Completed WF/PC-2 9115 (The Evolution of Extreme Gas Rich Galaxies)

The WF/PC-2 was used to observe a recently discovered sample of the
closest known low surface brightness, very gas-rich dwarf galaxies outside
of the Local Group. These galaxies represent an extreme star formation
environment, where the fuel for star formation appears plentiful, the local
environment {the Centaurus A group of galaxies} provides opportunities for
tidally-induced star formation, and yet star formation appears to be
surpressed {by two orders of magnitude} compared to other `typical'
galaxies. The goal is to understand the star formation history in this
puzzling environment of low stellar density and high gas content. By
resolving the underlying stellar component, the observer will obtain
critical information on the mean metallicity and star formation history of
these galaxies.

1.8 Completed WF/PC-2 8597 (The Fueling of Active Nuclei: Why are
Active Galaxies Active?)

The WF/PC-2 was used to investigate the accretion onto massive
black holes that are believed to be the energy source for AGN. However,
evidence for black holes in quiescent galaxies has also been reported. Why
are these galaxies inactive? One possibility is that active galaxies are
better at providing fuel to the nuclear region than quiescent
galaxies. Other possible fueling mechanisms such as ``bars-within-bars''
or nuclear spirals cannot be investigated from the ground because they are
relatively small features in the ISM. The observations were completed as
planned.

1.9 Completed WF/PC-2 9085 (Measuring The Masses Of High-Z Quasar Host
Galaxies)

The WF/PC-2 was used to investigate the close link between
black-hole mass and spheroid mass in both quiescent and active galaxies in
the local universe. Consequently black-hole and spheroid formation/growth
are now viewed as intimately related processes, and establishing the mass
of quasar host galaxies as a function of redshift is now seen as a key
measurement in observational cosmology. From the Cycle 7 NICMOS program,
the best estimate to date of the mass evolution of the hosts of both
radio-quiet and radio-loud quasars out to z ~eq 2 has been derived. Under
the assumption of passive stellar-population evolution our results are
consistent with the black-hole/spheroid population being unchanged out to z
~eq 2. However, the crucial assumption of passive evolution needs to be
tested. All observations competed nominally.

1.10 Completed WF/PC-2 8601 (A Snapshot Survey of Probable Nearby Galaxies)

The WF/PC-2 was used to continue the very successful snapshot
survey in order to use the high spatial resolution of HST to determine
whether selected galaxies are nearby on the basis of resolution into stars,
and the magnitudes and colors of the brightest stars. There were no
reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 8
Successful: 8

Scheduled Re-acquisitions: 8
Successful: 8

2.2 FHST Updates:
Scheduled: 17
Successful: 17

2.3 Operations Notes:

The STIS instrument remains in safe mode.

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

The engineering status buffer limits were adjusted twice, per ROP
DF-18A.

Per HSTAR 8242, after a successful guide star acquisition at
165/055059Z when a measurement was made of the V1 (roll) error while
guiding. This measured value (-1583.476 a-s) was saved in the telemetry
point QSFGENB0 which registered out-of-limits. The red low limit is
approximately 990 a-s. The subsequent guide star acquisition was successful.

The planned June iteration of the RMGA calibration was completed at
165/1458Z.

A TTR was written for a required re-transmit during a 486 load at
166/0712Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW