Status Report

Hubble Space Telescope Daily Report #2984 – 25 Oct 2001

By SpaceRef Editor
October 25, 2001
Filed under , ,

HUBBLE SPACE TELESCOPE

DAILY REPORT #2984

PERIOD COVERED: 0000Z (UTC) 10/24/01 – 0000Z (UTC) 10/25/01

Daily Status Report as of 298/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of STIS/CCD/MA1/MA2 9116 (Understanding
High-Redshift and Starburst Galaxies: A UV Spectroscopic Survey of B- Stars
in the SMC)

The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was
used to construct a high quality spectral library at low metallicity in
order to synthesize the UV spectra of high redshift star-forming galaxies
and nearby starbursts. No problems were reported.

1.2 Completed Three 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.

1.3 Completed Two Sets of WF/PC-2 8936 (Cycle 10 Supplemental Darks Pt1/3)

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

1.4 Completed Two Sets of STIS/CCD 8901 (Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. There was no anomalous activity.

1.5 Completed STIS/CCD 9187 (A Lyman Limit Snapshot Survey: The Search
for Candidate D/H Absorbers)

The Space Telescope Imaging Spectrograph (CCD) was used to measure
D/H in gas clouds seen against background QSOs. This provides a unique and
fundamental cosmological probe of the baryonic density parameter. To date,
most of the QSO absorption line D/H constraints have been derived at high
redshift. In this proposal the proposers investigate a lower redshift
range, because there are two potentially crucial advantages to be gained by
carrying out D/H measurements at intermediate redshift. First, the
background of HI forest lines is lower and contamination of the DI feature
is significantly reduced. Second, a far larger sample of very bright QSOs
exists. There were no reported problems.

1.6 Completed STIS/CCD 9088 (Next Generation Spectral Library of Stars)

The Space Telescope Imaging Spectrograph (CCD) was used to produce
a “Next Generation” Spectral Library of 600 stars for use in modeling the
integrated light of galaxies and clusters by using the low dispersion UV
and optical gratings of STIS. The library will be roughly equally divided
among four metallicities, very low {Fe/H < -1.5}, low {-1.5 < Fe/H < -0.5}, near-solar {-0.5 < Fe/H < 0.1}, and super-solar {Fe/H > 0.1}, well-sampling
the entire HR-diagram in each bin. Such a library will surpass all extant
compilations and have lasting archival value, well into the Next Generation
Space Telescope era. No problems occurred.

1.7 Completed Four Sets of WF/PC-2 9244 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
Archival Pure Parallel program. The program will be used to take parallel
images of random areas of the sky, following the recommendations of the
Parallels Working Group. The observations completed with no anomalous
activity.

1.8 Completed STIS/CCD 9126 (Galaxy Mass and the Fate of Luminous, Blue
Compact Galaxies at z~0.6)

The Space Telescope Imaging Spectrograph (CCD) was used to obtain
long-slit spectra for a sample of 6 luminous, blue, compact galaxies
{LBCGs} at z ~ 0.6. Despite being very luminous, LBCGs have velocity
widths Sigma ~ 60 kms and half-light radii r_e ~ 0.5” {or R_e ~
3Kpc}. Small sizes and velocity widths suggest LBCGs are low- mass stellar
systems , while their blue colors, strong emission lines and low M/L-ratios
indicate they are undergoing a major starburst. I f the star-forming
process halts after the current burst, models predict that LBCGs will fade
by ~2-4 magnitudes after a few Gyrs to reach the low luminosities and
surface brightnesses characteristic of spheroidal galaxies. The proposal
completed with no reported problems.

1.9 Completed STIS/CCD 9187 (A Lyman Limit Snapshot Survey: The Search
for Candidate D/H Absorbers)

The Space Telescope Imaging Spectrograph (CCD) was used to measure
D/H in gas clouds seen against background QSOs. This provides a unique and
fundamental cosmological probe of the baryonic density parameter. To date,
most of the QSO absorption line D/H constraints have been derived at high
redshift. In this proposal the proposers investigate a lower redshift
range, because there are two potentially crucial advantages to be gained by
carrying out D/H measurements at intermediate redshift. First, the
background of HI forest lines is lower and contamination of the DI feature
is significantly reduced. Second, a far larger sample of very bright QSOs
exists. There were no reported problems.

1.10 Completed STIS/CCD 8903 (Bias Monitor – Part 1)

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

1.11 Completed WF/PC-2 9155 (The Cepheid Distance to NGC 1637: A Direct
Comparison with the EPM Distance to SN 1999em)

The WF/PC-2 was used to directly compare distances estimated by two
primary extragalactic distance indicators. The appearance of supernova
1999em, a bright, extremely well- observed type II plateau event in the
nearby SBc galaxy NGC 1637 offers the best chance to test the consistency
of the Expanding Photosphere Method {EPM} of supernova distance
determination with that derived from Cepheid variable stars. Although EPM
distances have been measured to 18 type II supernovae out to 180 Mpc and
used to determine Hubble’s constant independent of the Cepheid distance,
there have never been any measurements of Cepheids in a galaxy that has
hosted a normal type II-P supernova, the classic variety of core-collapse
event to which EPM-derived distances are most robust. The proposal
completed nominally.

1.12 Completed STIS/CCD 9285 (POMS Test Proposal: STIS Non-scripted
Parallel Proposal Continuation III)

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.

1.13 Completed WF/PC-2/STIS/CCD 8573 (Newborn Planets and Brown Dwarf
Companions in IC 348)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to search for young giant planets and brown dwarfs around ~100
low-mass stars and brown dwarfs in the nearby cluster IC 348. The
observations completed with no reported problems.

1.14 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal – Nearby
Galaxies – Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies. This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies. These data will be placed immediately into the Hubble Data
Archive. The observations were completed as scheduled, and no problems
were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 7

Successful: 7

Scheduled Re-acquisitions: 3

Successful: 3

2.2 FHST Updates:

Scheduled: 16

Successful: 16

2.3 Operations Notes:

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

A TTR was written when there was a required re-transmit at
297/124442Z during a NSSC-1 load. Accordingly, at 297/1253Z, per ROP
NS-05, SI C&DH errors were reset.

The plus wing solar array drive mechanism (SADM) shaft temperature
monitor (BE2%DMT3) flagged out-of-limits low (yellow) at 297/211926Z with a
value of 24.3405 degC.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

SpaceRef staff editor.