Notice: For the foreseeable future, the daily reports may
contain
apparent discrepancies between some proposal descriptions
and the listed
instrument usage. This is due to the conversion of
previously approved
ACS WFC or HRC observations into WFPC2, or NICMOS
observations
subsequent to the loss of ACS CCD science capability in
late January.
HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT # 4384
PERIOD COVERED: UT June 14, 2007 (DOY 165)
OBSERVATIONS SCHEDULED
FGS 10927
The Weight-Watcher Program for Subdwarfs
We propose to use HST/FGS1r to measure five subdwarf
spectroscopic
binaries to determine masses for the components. Their
metallicities,
[Fe/H], range from -0.5 to -2.5, and their projected
minimum separations
range from 9 to 24 mas. These binaries are resolvable with
HST/FGS1r but
not any ground-based technique. Currently, there are only
two subdwarf
systems having any mass measurements. The proposed work
will boost the
total number of subdwarf systems with masses from two to
seven, and
allow us to construct the first mass-luminosity relation
for
low-metallicity stars.
NIC1/NIC2/NIC3 8794
NICMOS Post-SAA calibration - CR Persistence Part 5
A new procedure proposed to alleviate the CR-persistence
problem of
NICMOS. Dark frames will be obtained immediately upon
exiting the SAA
contour 23, and every time a NICMOS exposure is scheduled
within 50
minutes of coming out of the SAA. The darks will be
obtained in parallel
in all three NICMOS Cameras. The POST-SAA darks will be
non- standard
reference files available to users with a USEAFTER
date/time mark. The
keyword 'USEAFTER=date/time' will also be added to the
header of each
POST-SAA DARK frame. The keyword must be populated with
the time, in
addition to the date, because HST crosses the SAA ~8 times
per day so
each POST-SAA DARK will need to have the appropriate time
specified, for
users to identify the ones they need. Both the raw and
processed images
will be archived as POST-SAA DARKSs. Generally we expect
that all NICMOS
science/calibration observations started within 50 minutes
of leaving an
SAA will need such maps to remove the CR persistence from
the science
images. Each observation will need its own CRMAP, as
different SAA
passages leave different imprints on the NICMOS detectors.
NIC3 10996
NICMOS J-band Imaging of Strongly Lensing Clusters
We propose to use deep imaging in the F110W {'J'} band
over a large area
to search for highly magnified galaxies around massive
lensing clusters.
WFPC2 10818
Very Young Globular Clusters in M31 ?
We propose to use HST's unique high spatial resolution
imaging
capabilities to conclusively confirm or refute the
presence of alleged
very young globular clusters in M31. Such young globular
clusters with
ages < 3 Gyr are not present in our galaxy, and, if
real, would lead to
a striking difference in the age distribution of the GCs
between M31 and
the
in M31 is confirmed through our proposed ACS imaging {now
WFPC2 imaging}
with HST, this would suggest major differences in the
history of
assembly of the two galaxies, with probable substantial
late accretion
into M31 which did not occur in our own galaxy.
WFPC2 11084
Probing the Least Luminous Galaxies in the Local Universe
We propose to obtain deep color-magnitude data of eight
new Local Group
galaxies which we recently discovered: Andromeda XI,
Andromeda XII, and
Andromeda XIII {satellites of M31}; Canes Venatici I,
Canes Venatici II,
Hercules, and Leo IV {satellites of the Milky Way}; and
Leo T, a new
"free-floating" Local Group dwarf spheroidal
with evidence for recent
star formation and associated H I gas. These represent the
least
luminous galaxies known at *any* redshift, and are the
only accessible
laboratories for studying this extreme regime of galaxy
formation. With
deep WFPC-2 F606W and F814W pointings at their centers, we
will
determine whether these objects contain single or multiple
age stellar
populations, as well as whether these objects display a
range of
metallicities.
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are
preliminary reports
of potential non-nominal performance that will be
investigated.)
HSTARS: 10862 – GSacq(2,1,1) failed to RGA control.
GSacq(2,1,1) scheduled at 166/05:12:52 failed at 05:16:35
due to scan
step limit exceeded on FGS 2. OBAD1 showed errors of
V1=-433.76,
V2=-3218.95, V3=691.56,and RSS= 3320.85. OBAD2 showed
errors of
V1=-2.74, V2=-10.01, V3=9.53, and RSS= 14.09. the map at
05:20:22 showed
errors of V1=-0.61, V2=7.16, V3=3.43, and RSS = 7.96.
COMPLETED OPS REQUEST: (None)
SCHEDULED
SUCCESSFUL
FGS
GSacq
8
7
FGS
REacq
6
6
OBAD with Maneuver
28
28
COMPLETED OPS NOTES: (None)
SIGNIFICANT EVENTS: (None)