Status Report

Hubble Space Telescope Daily Report #2808 14 Feb 2001

By SpaceRef Editor
February 14, 2001
Filed under ,

HUBBLE SPACE TELESCOPE

DAILY REPORT #2808

PERIOD COVERED: 0000Z (UTC) 02/13/01 – 0000Z (UTC) 02/14/01

Daily Status Report as of 045/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Three Sets of WF/PC-2 8827 (Cycle 9 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 proposal completed nominally.

1.2 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.

1.3 Completed Five Sets of STIS/CCD 8562 (Probing the Large Scale
Structure: Cosmic Shear Observations)

The Space Telescope Imaging Spectrograph (CCD) was used to probe
the distortion of light bundles from distant galaxies, looking at the
statistical properties of the intervening inhomogeneous {dark} matter
distribution. The proposal completed nominally.

1.4 Completed Three Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. The proposal completed with no reported problems.

1.5 Completed STIS/CCD/MA2 8612 (Boron in the Lithium-Rich K-Giants: A
Critical Test of Deep Stellar Mixing Versus Brown-Dwarf Ingestion)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
observe the B I 2500Angstrom lines in four Li-rich K- giants using HST with
STIS/G230M in order to test two different evolutionary scenarios invoked to
explain the high Li abundances: the cool bottom process versus the possible
accretion of brown dwarfs/planets. There were no reported problems.

1.6 Completed Two Sets of WF/PC-2 8805 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
WFPC2 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 proposal completed with no reported
problems.

1.7 Completed STIS/CCD/MA2 8770 (The Nucleosynthesis of Boron –
Benchmarks for the Galactic Disk)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
determine boron (B) abundance. In spite of several HST cycles of B
abundance determinations, we do not know the true, ambient, present-day
abundance of B. Only two stars {with undepleted Li and Be} have been
observed to derive the Population I true B abundance. Past cycles have
focused on {1} halo stars with low metallicity and {2} solar-type stars
with Li and/or Be deficiencies. In this proposal, the stellar abundances
of B will be determined, measured from the B I 2497 Angstrom line from STIS
echelle spectra, of main sequence F-G stars that have retained their full
initial abundances of boron. Our target stars are those for which
ground-based observations show that beryllium is undepleted. These new
abundances will map evolution of the B abundance in the Galactic disk in
the metallicity range from one-third solar up to solar. Then the B, and
previously determined Li and Be abundances, will be used to improve
understanding of the nucleosynthesis of B. There were no reported anomalies.

1.8 Completed STIS/CCD/MA2 8569 (A New Survey for Low-Redshift Damped
Lyman-Alpha Lines in QSO MgII Systems)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
support studies which have shown that most of the observable neutral gas
mass in the Universe resides in QSO damped LyAlpha {DLA} systems. However,
at low redshift , DLA can only be found by searching in the UV with
HST. By boot-strapping from the MgII statistics, we will be able to
further improve the determination of the low- redshift statistical
properties of DLA {their incidence and cosmological mass density} and open
up new opportunities for studies at low redshift. The observations
completed nominally.

1.9 Completed WF/PC-2 8812 (Cycle 9 Internal Monitor)

The WF/PC-2 was used to obtain routine internal monitors for WFPC2
in order 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. There were no reported problems.

1.10 Completed STIS/CCD 8838 (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. The proposal completed nominally.

1.11 Completed WF/PC-2/STIS/CCD 8577 (Ozone, Condensates, and Dust in
the Martian Atmosphere)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to study the spatial and seasonal variations in ozone, condensates,
and dust in the Martian atmosphere. The data obtained promise to be
critical in addressing recent breakthroughs in understanding the basic
radiative, transport, and microphysical processes that provide for both
long-term and short-term balance within the global Mars climate
system. There were no reported problems.

1.12 Completed STIS/MA2 8843 (Cycle 9 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA2) was used to perform
the routine monitoring of the MAMA detector dark noise. The proposal
completed nominally.

1.13 Completed WF/PC-2 8725 (The Formation Epoch{s} of Globular
Clusters Around Ellipticals from Ultraviolet Photometry)

The WF/PC-2 was used to study the formation history of elliptical
galaxies by obtaining far-UV photometry of their globular clusters. The
far-UV photometry will be used in conjunction with existing optical data to
constrain the ages of these clusters, and thus the formation epochs of
their host galaxies. There were no reported problems.

1.14 Completed WF/PC-2/STIS/CCD 8679 (Constraining the Age of the
Oldest Stars from the White Dwarf Cooling Sequence in M4)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to search for the oldest and hence coolest white dwarfs {WDs} in M4,
the nearest Galactic globular cluster to the Sun. New models for cooling
hydrogen white dwarfs predict that their colors should become bluer, rather
than redder, with increasing age. The goal is to test these models and at
the same time constrain the age of M4. The proposal completed with no problems

1.15 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.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 5

Successful: 5

Scheduled Re-acquisitions: 10

Successful: 10

2.2 FHST Updates:

Scheduled: 11

Successful: 11

2.3 Operations Notes:

The SSR EDAC error counter was cleared twice per ROP SR-1A.

A TTR was written for a required re-transmit during a NSSC-1 load
uplink at 044/210103Z.

SI C&DH erros were reset at 044/2106Z, using ROP NS-5.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

SpaceRef staff editor.