Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_99/hst_status_06_01_99 Дата изменения: Tue Jun 1 14:39:46 1999 Дата индексирования: Sun Dec 23 11:02:33 2007 Кодировка: Поисковые слова: virgo cluster

HUBBLE SPACE TELESCOPE

DAILY REPORT #2383

PERIOD COVERED: 0000Z (UTC) 05/28/99 - 0000Z (UTC) 06/01/99

Daily Status Report as of 152/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Five 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 Ten Sets of WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats --
Part II)

The WF/PC-2 was used to take Earth flat calibration images. This
proposal obtains sequences of Earth streak flats to construct high quality
flat fields for the WF/PC-2 filter set. The observations were executed as
scheduled, and no anomalies were noted.

1.3 Completed Three Sets of WF/PC-2 8059 (POMS Test Proposal: WF-2
Targeted Parallel Archive Proposal)

The WF/PC-2 was used to make observations in parallel with the prime
science observations. The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels. Local group galaxies offer the opportunity
for a closer look at young stellar populations. The observations were
completed as planned, and no anomalies were reported.

1.4 Completed Seven Sets of 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.

1.5 Completed Three Sets of WF/PC-2 8210 (HST Imaging of Bi-Polar
Proto-Planetary Nebulae and Circumstellar Arcs)

The WF/PC-2 was used to make observations of the bi-polar
proto-planetary nebulei IRAS16594, IRAS20028 and IRAS17106.
Proto-planetary nebulae provide the best opportunity to test theories of
asymptotic giant branch mass loss {symmetric/asymmetric,
continuous/episodic} and the processes which shape planetary nebulae. The
observations were completed as planned, and no problems were reported.

1.6 Completed Two Sets of WF/PC-2/STIS/CCD 7615 (Determination of the
Mass Function of a Globular Cluster Through Gravitational Microlensing)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make gravitational microlensing observations of the large globular
cluster NGC-6656 located in Sagittarius in order to study its mass
function. Gravitational microlensing offers a unique and direct method of
determining the masses of stars and other compact objects down to planetary
masses. A bias and dark calibration observations were also taken. The
observations were completed as planned, and no problems were reported.

1.7 Completed WF/PC-2 7387 (T-Tauri Star Snapshot Survey)

The WF/PC-2 was used to make observations of the star SR-24S as part
of a T-Tauri class star survey. The observations were executed as
scheduled, and no anomalies were noted.

1.8 Completed Ten 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 both
low and 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. The observations were
completed as scheduled, and no anomalies were reported.

1.9 Completed STIS/MA1 7363 (The Nature of Two New Optical Counterparts
of Globular Cluster X-ray Sources)

The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of globular cluster NGC-6441 in order to study a new optical
counterpart to an X-ray source within the cluster. This source is a binary
star and has the shortest known binary period of any such star. A
wavelength calibration image was also taken. The observations were
executed as scheduled, and no anomalies were noted.

1.10 Completed Four 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 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.

1.11 Completed STIS/CCD/MA2 7334 (The Primordial Abundance of Deuterium
From a Metal-Poor Damped Lyman Alpha System)

The Space Telescope Imaging Spectrograph (CCD and MA1) were used to
make observations of the quasar Q2206-1958 to study the primordial
abundance of deuterium from a metal-poor damped Lyman-Alpha system. It
should be possible to detect D absorption in many Lyman series lines and
the chance of contamination by interloper H clouds is reduced by a factor
of > 150. A wave length calibration image was also taken. The
observations were executed as scheduled, and no anomalies were noted.

1.12 Completed STIS/CCD/MA1 7295 (Galaxy Rotation Curves at Large Radius
using Lyman-alpha Absorption Lines)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make rotational spectrographic observations of the galaxy TON1542. This is
to investigate the outer rotation curves of eight spiral galaxies at very
large galactocentric radii by using the kinematical information from
Lyman-alpha absorption lines in the spectra of background quasars. A
wavelength calibration image was also taken. The observations were
executed as scheduled, and no problems were reported.

1.13 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.

1.14 Completed STIS/CCD 8227 (The Shock Cones and Underlying Stars in
Interacting Wolf-Rayet Binaries)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the interacting Wolf-Rayet binary star WR86. This system
is a strong radio emitter of non-thermal radiation. A wavelength
calibration image was also taken. The observations were executed as
scheduled, and no anomalies were noted.

1.15 Completed WF/PC-2 7282 (A Continuing Snapshot Survey for Compact
Stellar Groups and Clusters around Wolf-Rayet Stars)

The WF/PC-2 was used to make observations of the Wolf-Rayet star
WR93 as part of a continuing snapshot survey of compact stellar groups and
clusters. The newly-imaged clusters allow us to accurately determine the
distances, luminosities, and ages of the WR members. The observations were
executed as scheduled, and no anomalies were noted.

1.16 Completed Two Sets of WF/PC-2 6574 (Ionization Structure,
Photoevaporation, and Star Formation in M-17)

The WF/PC-2 was used to make observations of the ionization
structure, the photoevaporation, and star formation in M-17.
Photoionization of photoevaporative flows provides a paradigm that ties the
density, ionization, and dynamical structure of H-II regions together in a
single physical description. The observations were completed as planned
and no problems were reported.

1.17 Completed Three 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+1610+29, B2+1527+30 and B2+0034+25. 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.

1.18 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-16490. 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.

1.19 Completed Two Sets of STIS/CCD/MA1 7432 (Morphological and Spectral
Evolution of Galaxies)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations to study the morphological and spectral evolution of the
galaxies 3C223-1 and 3C223-2. A library of ultraviolet images of normal
galaxies at low redshifts is essential to our understanding of the
properties and evolution of the high redshift universe. The observations
were completed as planned, and no problems were reported.

1.20 Completed Two Sets of STIS/CCD/MA2 8225 (Absorption and Obscuration
in Radio-Loud Quasars)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations of the radio-loud quasars MRC2136-25 and MRC2156-24. The
role of associated absorption systems and dust obscuration close to the
central engines of AGN is not understood. A wavelength calibration image
was also taken. The observations were completed as planned, and no
anomalies were reported.

1.21 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
0635) 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.

1.22 Completed WF/PC-2 7470 (A Snapshot Survey of Galactic Globular
Clusters)

The WF/PC-2 was used to make snapshot survey observations of the
crowded center of the galactic globular cluster NGC-6316. The resulting
color-magnitude diagram will include all stars down to about one magnitude
below the main-sequence turnoff. The observations were completed as
scheduled, and no problems were reported.

1.23 Completed WF/PC-2 7386 (A Snapshot Survey of Nova Shells)

The WF/PC-2 was used to make observational images of the super nova
shell Nova-Cen-1 in order to detect and measure its expanding gaseous
shell. These observations will trace the distribution of hot and cool gas
in the nova shells, and show their degree of inhomogeneity on both large
and small scales. The observations were completed as scheduled, and no
problems were noted.

1.24 Completed STIS/CCD/MA1 7757 (Time-Resolved Spectrophotometry of the
Smallest Mass Function Binary Star)

The Space Telescope Imaging Spectrograph (MA1) was used to make time
resolved spectrographic observations of the x-ray, small mass, contact
binary star KZ-Tra (a.k.a., The 7s Pulsar). The optical counterpart of
this star exhibits optical pulsations with the same period as the X-ray
pulsations. A wavelength calibration image was also taken. The
observations were executed as scheduled, and no anomalies were noted.

1.25 Completed 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.

1.26 Completed STIS/CCD 8540 (STIS UV Spectroscopy of the Bright
Galactic Nova Velorum 1999)

The Space Telescope Imaging Spectrograph (CCD) was used to make
ultraviolet spectrographic observations of the bright galactic
Nove-Velorum-1999. Nova Velorum 1999 {V382 Vel}, discovered on 1999 May
22, is the ninth brightest classical nova in recorded history, and probably
the brightest nova that will occur during the HST mission. A wave length
calibration image was also taken. The observations were executed as
scheduled, and no anomalies were noted.

1.27 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 HBC636 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.

1.28 Completed WF/PC-2 7379 (The Dense Core of M-30)

The WF/PC-2 was used to study the dense post core collapse globular
cluster NGC-7099 (a.k.a., M-30). These studies will be combined with our
ground-based observations of M-30 to help formulate a coherent
understanding of this remarkable cluster, teaching us more about the
dynamics of dense evolved clusters and the nature of the exotic objects
once hidden in their cores. The observations were executed as scheduled,
and no anomalies were noted.

1.29 Completed Two Sets of STIS/MA1 7950 (Cycle 7 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA1) 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.

2.0 FLIGHT OPERATIONS SUMMARY

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 30
Successful : 30

Scheduled Reacquisitions : 33
Successful : 33

2.2 FHST Updates:

Scheduled : 63
Successful : 62

As detailed in HSTAR 7150, the FHST roll delay update scheduled for
150/171235Z failed due to FHST-1. The following two full maneuver updates
as well as the next acquisition succeeded.

2.3 Operations Notes:

The HST operations team returned to the MOR at 149/1240Z, but
continue using the PRS ground system.

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

Per an operation requests the NICMOS FPA temperature sensor detector
#1 was enabled twice, at 150/1631Z and at 150/1831Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH