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#38375
Sat 05 Jul 2008 12:16:PM
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Joined: Feb 2001
Posts: 381,903
Launch Director
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OP
Launch Director
Joined: Feb 2001
Posts: 381,903 |
HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science
DAILY REPORT #4644
PERIOD COVERED: 5am July 1 - 5am July 2, 2008 (DOY 183/0900z-184/0900z)
OBSERVATIONS SCHEDULED
ACS/SBC 11158
HST Imaging of UV Emission in Quiescent Early-type Galaxies
We have constructed a sample of early type galaxies at z~0.1 that have
blue UV-optical colors, yet also show no signs of optical emission, or
extended blue light. We have cross-correlated the SDSS catalog and the
Galaxy Evolution Explorer Medium Imaging Survey to select a sample of
galaxies where this UV emission is strongest. The origin of the UV
rising flux in these galaxies continues to be debated, and the
possibility that some fraction of these galaxies may be experiencing low
levels of star formation cannot be excluded. There is also a possibility
that low level AGN activity {as evidenced by a point source} is
responsible We propose to image the UV emission using the HST/SBC and to
explore the morphology of the UV emission relative to the optical light.
WFPC2 11024
WFPC2 CYCLE 15 INTERNAL MONITOR
This calibration proposal is the Cycle 15 routine internal monitor for
WFPC2, to be run weekly 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 {both gain 7 and
gain 15 -- to test stability of gains and bias levels}, a test for
quantum efficiency in the CCDs, and a monitor for possible buildup of
contaminants on the CCD windows. These also provide raw data for
generating annual super-bias reference files for the calibration
pipeline.
FGS 11212
Filling the Period Gap for Massive Binaries
The current census of binaries among the massive O-type stars is
seriously incomplete for systems in the period range from years to
millennia because the radial velocity variations are too small and the
angular separations too close for easy detection. Here we propose to
discover binaries in this observational gap through a Faint Guidance
Sensor SNAP survey of relatively bright targets listed in the Galactic O
Star Catalog. Our primary goal is to determine the binary frequency
among those in the cluster/association, field, and runaway groups. The
results will help us assess the role of binaries in massive star
formation and in the processes that lead to the ejection of massive
stars from their natal clusters. The program will also lead to the
identification of new, close binaries that will be targets of long term
spectroscopic and high angular resolution observations to determine
their masses and distances. The results will also be important for the
interpretation of the spectra of suspected and newly identified binary
and multiple systems.
FGS 11213
Distances to Eclipsing M Dwarf Binaries
We propose HST FGS observations to measure accurate distances of 5
nearby M dwarf eclipsing binary systems, from which model-independent
luminosities can be calculated. These objects have either poor or no
existing parallax measurements. FGS parallax determinations for these
systems, with their existing dynamic masses determined to better than
0.5%, would serve as model-independent anchor points for the low-mass
end of the mass-luminosity diagram.
NIC1/NIC2/NIC3 11319
NICMOS Photometric Stability Monitoring
This NICMOS calibration proposal carries out photometric monitoring
observations during Cycle 15. The format is the same as the Cycle 14
version of the program (10725), but a few modifications were made with
respect to the Cycle 12 program 9995 and Cycle 13 program 10381.
Provisions had to be made to adopt to 2-gyro mode (G191B2B was added as
extra target to provide target visibility through most of the year).
Where before 4 or 7 dithers were made in a filter before we moved to the
next filter, now we observe all filters at one position before moving to
the next dither position. While the previous method was chosen to
minimize the effect of persistence, we now realize that persistence may
be connected to charge trapping and by moving through the filter such
that the count rate increases, we reach equilibrium more quickly between
charge being trapped and released. We have also increased exposure times
where possible to reduce the charge trapping non-linearity effects.
NIC1/NIC2/NIC3 11330
NICMOS Cycle 16 Extended Dark
This takes a series of Darks in parallel to other instruments.
NIC1/NIC2/NIC3 8795
NICMOS Post-SAA Calibration - CR Persistence Part 6
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 i
mages. Each observation will need its own CRMAP, as different SAA
passages leave different imprints on the NICMOS detectors.
NIC3 11545
A NICMOS Survey of Newly-Discovered Young Massive Clusters
We are on the cusp of a revolution in massive star research triggered by
2MASS and Spitzer/GLIMPSE, and now is the ideal time to capitalize on
these projects by performing the first survey of massive stars in young
stellar clusters throughout the Galactic plane. A search of the 2MASS
and GLIMPSE surveys has produced over 450 newly-identified massive
stellar cluster candidates in the Galactic plane which are hidden from
our view at optical wavelengths due to extinction. Here we propose a
program of 29 orbits to image the most promising candidate clusters in
broad and narrow band filters using HST/NICMOS. We will be complementing
these observations with approved Spitzer and Chandra programs,
numerous approved and planned ground-based spectroscopic observations,
and state-of-the-art modeling. We expect to substantially increase the
numbers of massive stars known in the Galaxy, including main sequence OB
stars and post-main sequence stars in the Red Supergiant, Luminous Blue
Variable and Wolf-Rayet stages. Ultimately, this program will address
many of the fundamental topics in astrophysics: the slope to the initial
mass function (IMF), an upper-limit to the masses of stars, the
formation and evolution of the most massive stars, gamma-ray burst (GRB)
progenitors, the chemical enrichment of the interstellar medium, and
nature of the first stars in the Universe.
WFPC2 11029
WFPC2 CYCLE 15 Intflat Linearity Check and Filter Rotation Anomaly
Monitor
Intflat observations will be taken to provide a linearity check: the
linearity test consists of a series of intflats in F555W, in each gain
and each shutter. A combination of intflats, visflats, and earthflats
will be used to check the repeatability of filter wheel motions.
{Intflat sequences tied to decons, visits 1-18 in prop 10363, have been
moved to the cycle 15 decon proposal xxxx for easier scheduling.} Note:
long-exposure WFPC2 intflats must be scheduled during ACS anneals to
prevent stray light from the WFPC2 lamps from contaminating long ACS
external exposures.
WFPC2 11070
WFPC2 CYCLE 15 Standard Darks - part II
This dark calibration program obtains dark frames every week in order to
provide data for the ongoing calibration of the CCD dark current rate,
and to monitor and characterize the evolution of hot pixels. Over an
extended period these data will also provide a monitor of radiation
damage to the CCDs.
WFPC2 11312
The Local Cluster Substructure Survey {LoCuSS}: Deep Strong Lensing
Observations with WFPC2
LoCuSS is a systematic and detailed investigation of the mass,
substructure, and thermodynamics of 100 X-ray luminous galaxy clusters
at 0.15<z<0.3. The primary goal is to test our recent suggestion that
this population is dominated by dynamically immature disturbed clusters,
and that the observed mass-temperature relation suffers strong
structural segregation. If confirmed, this would represent a paradigm
shift in our observational understanding of clusters, that were hitherto
believed to be dominated by mature, undisturbed systems. We propose to
complete our successful Cycle 15 program {SNAP:10881} which prior to
premature termination had delivered robust weak-lensing detections in 17
clusters, and candidate strongly-lensed arcs in 11 of these 17. These
strong and weak lensing signals will give an accurate measure of the
total mass and structure of the dark matter distribution that we will
subsequently compare with X-ray and Sunyaev Zeldovich Effect
observables. The broader applications of our project include 1} the
calibration of mass-temperature and mass-SZE scaling relations which
will be critical for the calibration of proposed dark energy
experiments, and 2} the low redshift baseline study of the demographics
of massive clusters to aid interpretation of future high redshift {z>1}
cluster samples. To complete the all-important high resolution imaging
component of our survey, we request deep WFPC2 observations of 20
clusters through the F606W filter, for which wide-field weak-lensing
data are already available from our Subaru imaging program. The
combination of deep WFPC2 and Subaru data for these 20 clusters will
enable us to achieve the science program approved by the Cycle 15 TAC.
WFPC2 11794
Cycle 16 Visible Earth Flats
This proposal monitors flatfield stability. This proposal obtains
sequences of Earth streak flats to construct high quality flat fields
for the WFPC2 filter set. These flat fields will allow mapping of the
OTA illumination pattern and will be used in conjunction with previous
internal and external flats to generate new pipeline superflats. These
Earth flats will complement the Earth flat data obtained during cycles
4-15.
WFPC2 11797
Supplemental WFPC2 CYCLE 16 Intflat Linearity Check and Filter Rotation
Anomaly Monitor
Supplemental observations to 11029, to cover period from Aug 08 to SM4.
Intflat observations will be taken to provide a linearity check: the
linearity test consists of a series of intflats in F555W, in each gain
and each shutter. A combination of intflats, visflats, and earthflats
will be used to check the repeatability of filter wheel motions.
(Intflat sequences tied to decons, visits 1-18 in prop 10363, have been
moved to the cycle 15 decon proposal 11022 for easier scheduling.)
Note: long-exposure WFPC2 intflats must be scheduled during ACS anneals
to prevent stray light from the WFPC2 lamps from contaminating long ACS
external exposures.
Note: These are supplemental observations to cover June to SM4 (Oct 8
'08) + 6 months.
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are preliminary reports
of potential non-nominal performance that will be investigated.)
HSTARS:
11371 GSAcq(1,2,2) failed to RGA Hold (Gyro Control) in LOS @ 183/20:31z
GSAcq @183/20:20:27z and subsequent REAcq @21:58:30z failed to RGA Hold
with (QF1SRLEX), (QF1STOPF) indication flags set on FGS-1. Received 486
ESB "a07" (FGS CT failed-Timeout for data valid FGS-1) @183/20:31 &
22:08z. Possible obs affected: NICMOS 137-145, Proposal ID#11545.
11372 Two REAcqs(2,1,2) failed due to Scan Step Limit Exceeded on FGS 2
@ 184/04:44:03z & 06:19:47z
GSAcq @184/03:06:23 was successful. REAcqs(2,1,2) @04:40:34z and 06:16z
failed to RGA hold due to scan step limit exceeded on FGS 2. Received
QF2SSLEX and QF2STOPF stop flags. Possible obs affected: NICMOS #157-160,
Proposal #11135 & # 11330.
COMPLETED OPS REQUEST: (None)
COMPLETED OPS NOTES: (None)
SCHEDULED SUCCESSFUL
FGS GSacq 08 07
FGS REacq 05 02
OBAD with Maneuver 26 26
SIGNIFICANT EVENTS: (None)
David Cottle
UBB Owner & Administrator
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DAILY REPORT #4644
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Sat 05 Jul 2008 12:16:PM
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