Daily Report #5167
HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science
DAILY REPORT #5167
PERIOD COVERED: 5am August 24 - 5am August 25, 2010 (DOY 236/09:00z-237/09:00z)
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
For DOY 221:
12362 - GSAcq(2,1,1) at 221/23:59:30z required two attempts to achieve
CT-DV on FGS2.
Observations possibly affected: STIS 12 Proposal ID#11568
COMPLETED OPS REQUEST: (None)
COMPLETED OPS NOTES: (None)
FGS GSAcq 04 04
FGS REAcq 11 11
OBAD with Maneuver 03 03
SIGNIFICANT EVENTS: (None)
CCD Dark Monitor Part 2
Monitor the darks for the STIS CCD.
CCD Bias Monitor-Part 2
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.
STIS Cycle 17 MAMA Dark Monitor
This proposal monitors the behavior of the dark current in each of the
The basic monitor takes two 1380s ACCUM darks each week with each
detector. However, starting Oct 5, pairs are only included for weeks
that the LRP has external MAMA observations planned. The weekly pairs
of exposures for each detector are linked so that they are taken at
opposite ends of the same SAA free interval. This pairing of exposures
will make it easier to separate long and short term temporal
variability from temperature dependent changes.
For both detectors, additional blocks of exposures are taken once
every six months. These are groups of five 1314s FUV-MAMA Time-Tag
darks or five 3x315s NUV ACCUM darks distributed over a single
SAA-free interval. This will give more information on the brightness
of the FUV MAMA dark current as a function of the amount of time that
the HV has been on, and for the NUV MAMA will give a better measure of
the short term temperature dependence.
Massive Star CSI: Has The Progenitor of SN2008S Vanished?
SN2008S in NGC6946 is the prototype of a new class of optical
transients. Its luminosity was low for a Type II supernova, and the
progenitor star was identified as a completely dust obscured log
(L/Lsun)=4.5, T=440K massive star (~10 Msun) in archival Spitzer data.
It is uncertain whether this is a new class of low-luminosity
supernova (e.g. an electron capture supernova) or a new class of
massive star outburst. The transient has now faded to the point where
the source is again invisible in the optical. Near-IR detections are
consistent with a somewhat hotter source, T~1200K, somewhat brighter
than the progenitor and still fading at ~3 mag/year. Using two epochs
of IRAC observations to constrain the mid-IR emission, and two epochs
of HST H-band/J-band observations to constrain emission from cool
stars, we will solve this mystery by either identifying and
characterizing the surviving progenitor or ruling out its survival.
Illuminating the HI Structure of a Proto-cluster Region at z=2.84
We propose very deep intermediate-band Lyman alpha imaging in the
field of a newly-discovered proto-cluster region surrounding the
extremely luminous QSO HS1549+19 at z=2.844. The large structure,
initially discovered in a spectroscopic survey of galaxies in fields
surrounding the brightest QSOs at z=2.5-2.8, represents an ideal
laboratory for studying the response of the intergalactic medium to a
source of ionizing photons that exceeds the UV background by factors
1000. Within a single pointing of WFC3-UVIS there are already more
than 45 known Lyman alpha emitters, most of which are already
spectroscopically confirmed, and at least 3 of which are giant ``Lyman
alpha blobs''. Many of the objects have properties similar to those
expected from the process of fluorescence, in which Lyman alpha
emission is induced by the UV radiation field of the QSO in any HI gas
that dense enough to remain partially self-shielded. Fortuitously, the
F467M filter (Stromgren "b") in WFC3-UVIS is a perfect match to Lyman
alpha at z=2.844. In combination with an equally deep broad-band
continuum image, the observations will allow the construction of a
Lyman alpha map tracing dense gas throughout the inner parts of a
proto-cluster region at sub-kpc resolution. The ability to measure the
spatial sub-structure and surface brightness distribution of Lya
emission, relative to known protocluster galaxies and AGN, will
illuminate the ?cosmic web'' in a dense region caught in a violent
stage of formation.
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).
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