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Daily Report #4760



 
 
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Old December 19th 08, 06:02 PM posted to sci.astro.hubble
Cooper, Joe
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Default Daily Report #4760

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT****** #4760

PERIOD COVERED: 5am December 18 - 5am December 19, 2008 (DOY
*************************** 353/1000z-354/1000z)

OBSERVATIONS SCHEDULED

WFPC2 10877

A Snapshot Survey of the Sites of Recent, Nearby Supernovae

During the past few years, robotic {or nearly robotic} searches for
supernovae {SNe}, most notably our Lick Observatory Supernova Search
{LOSS}, have found hundreds of SNe, many of them in quite nearby
galaxies {cz 4000 km/s}. Most of the objects were discovered before
maximum brightness, and have follow-up photometry and spectroscopy;
they include some of the best-studied SNe to date. We propose to
conduct a snapshot imaging survey of the sites of some of these nearby
objects, to obtain late-time photometry that {through the shape of the
light and color curves} will help reveal the origin of their lingering
energy. The images will also provide high-resolution information on
the local environments of SNe that are far superior to what we can
procure from the ground. For example, we will obtain color-color and
color-magnitude diagrams of stars in these SN sites, to determine the
SN progenitor masses and constraints on the reddening. Recovery of the
SNe in the new HST images will also allow us to actually pinpoint
their progenitor stars in cases where pre- explosion images exist in
the HST archive. This proposal is an extension of our successful Cycle
13 snapshot survey with ACS. It is complementary to our Cycle 15
archival proposal, which is a continuation of our long-standing
program to use existing HST images to glean information about SN
environments.

FGS 11870

Calibrating FGS1R's Optical Field Angle Distortion (OFAD), Second
Epoch

This proposal gathers the data needed to calibrate the optical field
angle distortions in FGS1r to the level of accuracy required for
astrometry science. Selected stars from the galactic cluster M35 are
repeatedly observed in POSITION mode by FGS1r with F583W filter at a
variety of spacecraft pointings and telescope roll angles. Ideally the
observations are to occur at a time when this ecliptic star field is
near the anti-sun direction so that HST's roll angle is unconstrained.
Unfortunately this is not possible under two gyro operations.
Therefore, the observations in this proposal are somewhat very
constrained in roll. However, this test should suffice as an adequate
update to the original FGS1r OFAD that executed in December 2000. For
each visit, the desired telescope pointing is specified by POS TARG
and ORIENT special requirements.

FGS 11943

Binaries at the Extremes of the H-R Diagram

We propose to use HST/Fine Guidance Sensor 1r to survey for binaries
among some of the most massive, least massive, and oldest stars in our
part of the Galaxy. FGS allows us to spatially resolve binary systems
that are too faint for ground-based, speckle or optical long baseline
interferometry, and too close to resolve with AO. We propose a
SNAP-style program of single orbit FGS TRANS mode observations of very
massive stars in the cluster NGC 3603, luminous blue variables, nearby
low mass main sequence stars, cool subdwarf stars, and white dwarfs.
These observations will help us to (1) identify systems suitable for
follow up studies for mass determination, (2) study the role of
binaries in stellar birth and in advanced evolutionary states, (3)
explore the fundamental properties of stars near the main
sequence-brown dwarf boundary, (4) understand the role of binaries for
X-ray bright systems, (5) find binaries among ancient and nearby
subdwarf stars, and (6) help calibrate the white dwarf mass - radius
relation.

WFPC2 11944

Binaries at the Extremes of the H-R Diagram

We propose to use HST/Fine Guidance Sensor 1r to survey for binaries
among some of the most massive, least massive, and oldest stars in our
part of the Galaxy. FGS allows us to spatially resolve binary systems
that are too faint to observe using ground-based, speckle or optical
long baseline interferometry, and too close to resolve with AO. We
propose a SNAP-style program of single orbit FGS TRANS mode
observations of very massive stars in the cluster NGC 3603, luminous
blue variables, nearby low mass main sequence stars, cool subdwarf
stars, and white dwarfs. These observations will help us to (1)
identify systems suitable for followup studies for mass determination,
(2) study the role of binaries in stellar birth and in advanced
evolutionary states, (3) explore the fundamental properties of stars
near the main sequence-brown dwarf boundary, (4) understand the role
of binaries for X-ray bright systems, (5) find binaries among ancient
and nearby subdwarf stars, and (6) help calibrate the white dwarf mass
- radius relation.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.)

HSTARS: (None)

COMPLETED OPS REQUEST:

18375-0 - Safe NICMOS

COMPLETED OPS NOTES: (None)

*********************** SCHEDULED***** SUCCESSFUL

FGS GSacq************** 14***************** 14
FGS REacq*************** 0****************** 0
OBAD with Maneuver **** 27***************** 27

SIGNIFICANT EVENTS:

Flash Report NICMOS Safe:

At 353/19:32:26 UTC, NICMOS was commanded to safe mode to reduce any
NICMOS parasitic heat effects during the NCS cooldown period.


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