Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_00/hst_status_04_03_00 Дата изменения: Mon Apr 3 14:58:44 2000 Дата индексирования: Sun Dec 23 10:13:15 2007 Кодировка: Поисковые слова: galactic cluster

HUBBLE SPACE TELESCOPE

DAILY REPORT #2593

PERIOD COVERED: 0000Z (UTC) 03/31/00 - 0000Z (UTC) 04/03/00

Daily Status Report as of 094/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Five Sets of WF/PC-2 8460 (Cycle 8 Supplemental Darks pt2/3)

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 observations completed with no reported problems.

1.2 Completed Five Sets of STIS/CCD 8217 (Tests of Stellar Models Using
Four Extremely Massive Spectroscopic Binaries in the R136 Cluster)

The Space Telescope Imaging Spectrograph (CCD) was used to observe
four non-interacting double-lined spectroscopic binaries discovered in the
R136 cluster by the Cycle 6 FOS spectroscopy. The proposal completed
nominally.

1.3 Completed Eight 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. As described in 2.1 and HSTAR 7563, the
acquisition for the final iteration of this proposal defaulted to fine lock
backup on one FGS, possibly affecting two observations. Otherwise, the
observations were executed as scheduled, and no further anomalies were noted.

1.4 Completed Three Sets of STIS/CCD 8439 (Bias Monitor-Part 2 C8)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at
gain = 4, to build up high-S/N superbiases and track the evolution of hot
columns. The proposal completed with no reported problems.

1.5 Completed Three Sets of STIS/CCD 8228 (The Black Hole Versus Bulge
Mass Relationship in Spiral Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the galaxies NGC-4303, NGC-5713 and NGC-3887 in order to
study the black hole versus bulge mass relationship in spiral
galaxies. Wavelength calibration images were also taken. The observations
were executed as scheduled, and no anomalies were noted.

1.6 Completed Three Sets of WF/PC-2 8445 (WF/PC-2 Cycle 8 Earth Flats)

The WF/PC-2 was used to make Cycle 8 Earth flat calibration
observations. This is to obtain 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.

1.7 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

The WF/PC-2 was used to make a bias, and an internal flat,
observation as part of a Cycle-8 monitoring program to monitor the health
of the cameras. 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. The
observations were executed as scheduled, and no anomalies were noted.

1.8 Completed Five Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. The proposal completed nominally.

1.9 Completed Two Sessions of FGS 8527 (Near Term Stability)

FGS-2R was used to determine the near term stability of the
instrument. The goals are twofold: {1} to establish the baseline Long Term
Stability measurement for the new FGS and monitor changes in the relative
plate scale and distortion since the SMOV MiniOFAD; and {2} to monitor
changes in the transfer function over months. The proposal completed
nominally.

1.10 Completed Three Sets of STIS/CCD 8796 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

The Space Telescope Imaging Spectrograph (CCD) was used in the
parallel mode to make some low galactic latitude archive observations. The
observations were executed as scheduled, and no anomalies were noted.

1.11 Completed Six Sets of STIS/CCD 8549 (POMS Test Proposal:
Non-Scripted Parallel Proposal Continuation I)

The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude, non-scripted parallel observations as part of a POMS
test proposal. The observations were completed as planned, and no
anomalies were reported.

1.12. Completed STIS/CCD 8176 (Confirmation and Characterization of
Brown Dwarfs and Giant Planets from NICMOS 7226/7227)

The Space Telescope Imaging Spectrograph (CCD) was used to make
confirmation and characterization observations of object GL577B. This is a
continuation of NICMOS 7226/7227 using the STIS. A systematic search for
giant planet and brown dwarf companions to stars in the solar neighborhood
was the cornerstone of the NICMOS IDT's Environments of Nearby Stars {EONS}
program. The observations were completed as planned, and no anomalies were
reported.

1.13 Completed WF/PC-2 8230 (Snapshot Survey of Dynamically Close
Galaxy Pairs from z=0.1 to z=0.5)

The WF/PC-2 was used to make snapshot survey observations of
galactic cluster Gal-Clus-0. This is to obtain snapshot images of a large,
well-defined, and dynamically selected sample of close galaxy pairs at
moderate redshift. The observations were executed as scheduled, and no
anomalies were noted.

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

The WF/PC-2 was used to observe the parallel opportunities
available 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. Narrow-band images in F656N can be used both to identify
young stars via their emission lines, and to map the gas distribution in
star-forming regions. The observations completed nominally.

1.15 Completed Two Sets of STIS/CCD/MA1/MA2 8165 (Pervasive Hot Gas
Hidden in Galaxy Groups: A Substantial Baryon Reservoir?)

The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was
used to make observations of galactic cluster H1821+643 to look for
pervasive hot gas in the intracluster media. Cosmological simulations
predict that at z ~ 0, most groups of galaxies should be embedded in large
filaments and sheets of shock heated gas at 10^5 -- 10^6 ^degrees K. A
wavelength calibration image was also taken. The observations were
executed as scheduled, and no anomalies were noted.

1.16 Completed WF/PC-2 8696 (Disentangling the Bulge and NGC 6528 - A
Proper Motion Study)

The WF/PC-2 was used to obtain second epoch observations of the
Galactic globular cluster NGC 6528. These will be used to obtain proper
motions of the cluster relative to the background bulge field and thus
provide, for the first time, a color-magnitude diagram of NGC 6528 free
from background stars. The proposal completed nominally.

1.17 Completed WF/PC-2 8263 (Snapshots of Sub-mJy Starburst Galaxies)

The WF/PC-2 was used to make observations of the starbursting
galaxy GAL-011126. Some of the most ambitious and widely cited
extragalactic observations in recent years have been the constraints made
on the star formation history of the Universe. The observations were
completed as planned, and no anomalies were reported.

1.18 Completed WF/PC-2 8270 (Proper Motion of the Leo II Dwarf Spheroidal)

The WF/PC-2 was used to continue the investigation into the proper
motion of distant satellites of the Milky Way with a series of HST
snapshots around faint galaxies within the Leo II astrometric field. A
proper motion for Leo II will be determined by combining images from 111
Palomar 200" photographic plates taken by Baade between 1950-1959 with the
HST snapshots. Only with the fine pixel scale of HST can we realistically
hope to match the exquisite Baade images, which were all taken on the very
best nights from a decade of Baade's allotment of about forty 200 arcsecond
nights a year. The observations completed with no reported problems.

1.19 Completed WF/PC-2 8457 (UV Earth Flats)

The WF/PC-2 was used to obtain a series of Ultraviolet Earth
flats. The observations were completed with no reported problems.

1.20 Completed STIS/CCD 8418 (CCD Sensitivity Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard source AGK+81D266 as part of a CCD
sensitivity-monitoring program in Cycle-8. The sensitivity of each CCD
grating mode is monitored to detect any change due to contamination or
other causes. A wavelength calibration image was also taken. The
observations were completed as planned, and no anomalies were reported.

1.21 Completed WF/PC-2 8322 (The Distance to NGC 2841: Improving the TF
Calibration and Definitively Testing MOND)

The WF/PC-2 was used to measure a distance to the spiral galaxy NGC
2841 using Cepheid variables. NGC 2841 provides a unique opportunity to
simultaneously probe three separate phenomenon in extragalactic astronomy:
1} It will provide the highest rotational velocity data point for the
Cepheid based calibration of the I-band Tully-Fisher relation and thus will
firmly determine if this relation experiences curvature or remains linear
all the way out to high rotational velocities. 2} It has hosted two SN Ia
events; both of which have good photometry {1957A and 1972R}- this
significantly adds to the number of calibrators for the SN Ia distance
scale; 3} If its distance can be shown to be significantly less than 19.5
MPC, then MOND can be definitively ruled out because NGC 2841 will require
a value of a_o substantially in excess of the empirically determined
"universal" value. The observations completed nominally.

1.22 Completed WF/PC-2 8100 (Calibration of Nearby Type Ia Supernovae
as Standard Candles: The Next Step)

The WF/PC-2 was used to continue the calibration experiment for M{
max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to
their parent galaxies. The proposal completed nominally.

1.23 Completed STIS/CCD/MA1 8311 (Moderate Redshift Analogs To
Lyman-Break Galaxies?)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
determine whether high luminosity galaxies selected using rest ultraviolet
luminosity at low-to-moderate redshift {0.2 Galaxies are related to Lyman-Break galaxies at high redshift {3 selected by the drop-out technique. The observations completed with no
reported problems.

1.24 Completed WF/PC-2 8544 (POMS Test Proposal: WFII Backup Parallel
Archive Proposal II)

The WF/PC-2 was used to execute a POMS test proposal which was
designed to simulate scientific plans. No problems were encountered.

1.25 Completed STIS/CCD/MA1 8273 (The Oxygen Abundance in Translucent
Interstellar Clouds)

The Space Telescope Imaging Telescope (CCD and MA1) was used to
obtain high-resolution STIS echelle observations of the interstellar O I
Lambda1356 absorption toward a sample of stars behind six translucent
clouds characterized by large H I column densities and high
extinctions. Previous GHRS measurements of this weak feature in diffuse
clouds have shown no evidence of density-dependent O depletion from the gas
phase and indicate a total {gas + dust} interstellar O abundance that is
about 2/3 of the solar value. As described in 2.1 and HSTAR 7563, the
acquisition for this proposal defaulted to fine lock backup on one FGS,
possibly affecting three observations. Otherwise, the observations were
completed nominally with no further problems..

1.26 Completed STIS/CCD/MA2 8188 (Snapshot Spectroscopic Diagnostic
Survey of the Symbiotic Stars)

The Space Telescope imaging Spectrograph (CCD and MA1) was used to
make ultraviolet observations of star LMC1 as part of a snapshot
spectroscopic diagnostic survey of symbiotic stars. Using these data we
will be able to establish meaningful statistical limits on the nature of
hot component sources of ionization and fundamental wind parameters, which
are vital steps toward understanding the accretion hydrodynamics and the
evolutionary status of symbiotic systems. A wavelength calibration image
was also taken. The observations were executed as scheduled, and no
anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 21
Successful: 21

Per HSTAR 7563, the acquisition at 093/190243Z defaulted to fine
lock backup on FGS-1 only when FGS-3 exceeded the scan step limit. The
proposals detailed in 1.3 and 1.25 may have been affected.
Scheduled Re-acquisitions: 19
Successful: 19

2.2 FHST Updates:
Scheduled: 52
Successful: 52

2.3 Operations Notes:

This weekend, using ROP SR-1A, the SSR EDAC error counter was
cleared five times.

Operations returned to CCS string "A" at 091/2341Z. Strings "A"
and "G" acquired no date at an AOS beginning at 092/0805Z. The cross
points were re-cycled at 092/0819Z, but "A" string remained down. CCS "G"
string was made prime at 092/0946Z. "A" string was subsequently brought
up. A line outage recorder dump was requested and began to be re-played at
093/2200Z to recover data lost during this period. HSTAR 7564 was written
to document these events.

SI C&DH errors were reset at 092/0522Z, at 092/1349Z and at
093/1744Z per ROP NS-5.

A TTR was written for a period during which no ODMs or GCMRs could
be sent due to NCC problems. This lasted from 091/2227Z until
092/0009Z. There was no operational impact.

HSTARs 7560 and 7565 document two periods, on day 92 and on day
094, when the battery discharge ratios for batteries 1-6 were out-of-limits
high for approximately one orbit. During the next orbit day, the batteries
reached a trickle charge and all buffers and the trickle charge timer were
reset.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW