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#46030
Thu 17 Sep 2009 12:15: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 #4932
PERIOD COVERED: 5am September 16 - 5am September 17, 2009 (DOY 259/09:00z-260/09:00z)
OBSERVATIONS SCHEDULED
ACS/WFC3 11879
CCD Daily Monitor (Part 1)
This program comprises basic tests for measuring the read noise and dark
current of the ACS WFC and for tracking the growth of hot pixels. The
recorded frames are used to create bias and dark reference images for
science data reduction and calibration. This program will be executed
four days per week (Mon, Wed, Fri, Sun) for the duration of Cycle 17. To
facilitate scheduling, this program is split into three proposals. This
proposal covers 352 orbits (22 weeks) from 31 August 2009 to 31 January
2010.
COS/FUV 11997
FUV Internal/External Wavelength Scale Monitor
This program monitors the offsets between the wavelength scale set by
the internal wavecal versus that defined by absorption lines in external
targets. This is accomplished by observing two external targets in the
SMC: SK191 with G130M and G160M and Cl* NGC 330 ROB B37 with G140L
(SK191 is too bright to be observed with G140L). The cenwaves observed
in this program are a subset of the ones used during Cycle 17. Observing
all cenwaves would require a considerably larger number of orbits.
Constraints on scheduling of each target are placed so that each target
is observed once every ~2-3 months. Observing the two targets every
month would also require a considerably larger number of orbits.
COS/NUV 11896
NUV Spectroscopic Sensitivity Monitoring
The purpose of this proposal is to monitor sensitivity of each NUV
grating mode to detect any changes due to contamination or other causes.
COS/NUV/FUV 11673
Dynamics in the Atmosphere of the Evaporating Planet HD189733b
With HST/STIS, we detected and characterized the upper atmosphere of the
extrasolar planet HD209458b, showing that the planet must be evaporating
at a rate of ~10^10 g/s in a "blow-off" mechanism.
More recently, using ACS we concluded that HD189733b is also
evaporating. However, because of the low resolution of the ACS prism
spectroscopy, the escape rate and mechanism are still to be determined.
This is one of the prime objectives of the present proposal.
COS observations of the absorption line profile with 15 km/s resolution
will allow us to probe the dynamics of the escaping gas, and therefore
to determine the escape rate. Simultaneous observations of the transit
depth and spectral shape in several important lines (not only HI, but
also OI, CII and possibly NI) will constrain the escape mechanism and
allow us to distinguish between several scenarios. The results will
enlighten the physical phenomenons at work in the exosphere of these
extrasolar planets, and provide new constraints for the modeling of the
evaporation of hot-Jupiters.
STIS/CCD 11844
CCD Dark Monitor Part 1
The purpose of this proposal is to monitor the darks for the STIS CCD.
STIS/CCD 11846
CCD Bias Monitor-Part 1
The purpose of this proposal is to monitor the bias in the 1x1, 1x2,
2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up
high-S/N superbiases and track the evolution of hot columns.
WFC3/ACS/IR 11600
Star Formation, Extinction, and Metallicity at 0.7<z<1.5: H-Alpha Fluxes
and Sizes from a Grism Survey of GOODS-N
The global star formation rate (SFR) is ~10x higher at z=1 than today.
This could be due to drastically elevated SFR in some fraction of
galaxies, such as mergers with central bursts, or a higher SFR across
the board. Either means that the conditions in z=1 star forming galaxies
could be quite different from local objects. The next step beyond
measuring the global SFR is to determine the dependence of SFR,
obscuration, metallicity, and size of the star-forming region on galaxy
mass and redshift. However, SFR indicators at z=1 typically apply local
calibrations for UV, [O II] and far-IR, and do not agree with each other
on a galaxy-by-galaxy basis. Extinction, metallicity, and dust
properties cause uncontrolled offsets in SFR calibrations. The great
missing link is Balmer H-alpha, the most sensitive probe of SFR. We
propose a slitless WFC3/G141 IR grism survey of GOODS-N, at 2
orbits/pointing. It will detect Ha+[N II] emission from 0.7<z<1.5, to
L(Ha) = 1.7 x 10^41 erg/sec at z=1, measuring H-alpha fluxes and sizes
for > 600 galaxies, and a small number of higher-redshift emitters. This
will produce: an emission-line redshift survey unbiased by magnitude and
color selection; star formation rates as a function of galaxy
properties, e.g. stellar mass and morphology/mergers measured by ACS;
comparisons of SFRs from H-alpha to UV and far-IR indicators;
calibrations of line ratios of H-alpha to important nebular lines such
as [O II] and H-beta, measuring variations in metallicity and extinction
and their effect on SFR estimates; and the first measurement of scale
lengths of the H-alpha emitting, star-forming region in a large sample
of z~1 sources.
WFC3/UVIS 11650
Mutual Orbits, Colors, Masses, and Bulk Densities of 3 Cold Classical
Trans-Neptunian Binaries
Many Trans-Neptunian Objects (TNOs) have been found to be binary or
multiple systems. As in other astrophysical settings, Trans-Neptunian
Binaries (TNBs) offer uniquely valuable information. Their mutual orbits
allow the direct determination of their system masses, perhaps the most
fundamental physical quantity of any astronomical object. Their
frequency of occurrence and dynamical characteristics provide clues to
formation conditions and evolution scenarios affecting both the binaries
and their single neighbors. Combining masses with sizes, bulk densities
can be measured. Densities constrain bulk composition and internal
structure, key clues to TNO origins and evolution over time. Several TNB
bulk densities have been determined, hinting at interesting trends. But
none of them belongs to the Cold Classical sub- population, the one
group of TNOs with demonstrably distinct physical characteristics. Two
top-priority Spitzer programs will soon observe and measure the sizes of
3 Cold Classical TNBs. This proposal seeks to determine the mutual
orbits and thus masses of these systems, enabling computation of their
densities.
WFC3/UVIS 11905
WFC3 UVIS CCD Daily Monitor
The behavior of the WFC3 UVIS CCD will be monitored daily with a set of
full-frame, four-amp bias and dark frames. A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations. The internals from this
proposal, along with those from the anneal procedure (Proposal 11909),
will be used to generate the necessary superbias and superdark reference
files for the calibration pipeline (CDBS).
WFC3/UVIS 11907
UVIS Cycle 17 Contamination Monitor
The UV throughput of WFC3 during Cycle 17 is monitored via weekly
standard star observations in a subset of key filters covering 200-600nm
and F606W, F814W as controls on the red end. The data will provide a
measure of throughput levels as a function of time and wavelength,
allowing for detection of the presence of possible contaminants.
WFC3/UVIS 11908
Cycle 17: UVIS Bowtie Monitor
Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days.
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i.e., a QE offset without any discernable pattern. These lab tests
have further revealed that overexposing the detector to count levels
several times full well fills the traps and effectively neutralizes the
bowtie. Each visit in this proposal acquires a set of three 3x3 binned
internal flatfields: the first unsaturated image will be used to detect
any bowtie, the second, highly exposed image will neutralize the bowtie
if it is present, and the final image will allow for verification that
the bowtie is gone.
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: (None)
COMPLETED OPS NOTES: (None)
SCHEDULED SUCCESSFUL
FGS GSAcq 9 9
FGS REAcq 8 8
OBAD with Maneuver 8 8
SIGNIFICANT EVENTS: (None)
David Cottle
UBB Owner & Administrator
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