HUBBLE
SPACE TELESCOPE - Continuing to collect World Class Science
DAILY
REPORT #4898
PERIOD
COVERED: 5am July 29 - 5am July 30, 2009 (DOY 210/09:00z-211/09:00z)
OBSERVATIONS
SCHEDULED
COS
11474
COS
NUV Internal/External Wavelength Scales
Observe
external radial velocity standard targets (preferably, though
not
required, in CVZ) in TIME-TAG (FLASH=YES) mode with as many grating
and
central wavelength combinations as feasible. The purpose is to
obtain
zero-point offsets for the wavelength scale (internal wavecal
lamp
scale to external standard wavelength scale) for all central
wavelengths.
Following this determination, adjustments of the nominal
science
target spectral range for each grating and central wavelength
combination
will be made via SMS patchable constant for nominal OSM2
positions
corresponding to each central wavelength. Subsequent to this
modification
of the wavelength scale (and its verification in COS 15 -
program
11475), NUV science-related operations and wavelength-scale
dependent
EROs can commence.
COS
11478
COS
NUV Flat Fields
Acquire
long NUV flat field exposures using the internal deuterium
calibration
lamp with the G185M grating. Use central wavelengths of 1835
angstroms,
1850 angstroms, and 1864 angstroms. Based on data taken
during
thermal vacuum testing in 2003 (Test 1750), a total of 65,000
seconds
of data should be sufficient to obtain ~7.5x10^7 total counts in
the
science region of the detector (> 200 counts per pixel, or 1800
counts
per 3 x 3 pixel resolution element).
This
is SMOV4 Activity COS-18.
STIS07
11404
CCD
Dark and Bias Monitor for SMOV4/Cycle 17 Activity STIS-07
Monitor
the darks for the STIS CCD. 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.
STIS18
11351
NUV
MAMA HV Recovery
This
proposal addresses the concerns over Cesium migration from the NUV
MAMA
photocathode into the pores of the microchannel plate and lays out
the
procedures necessary to permit a safe and controlled recovery of the
NUV-MAMA
detector to science. This procedure should only be used during
the
SMOV4 high voltage recommissioning phase for the NUV-MAMA. After,
the
normal ramping procedure should be used. This proposal is loosely
based
on proposal 10036, STIS MAMA Anomalous Recovery, with the
differences
summarized below: (1) additional plateaus during voltage
commanding,
(2) longer dwells after each 50 V step, (3) intermediate
ramp
re-structured into 2 parts, (4) change in yellow and red limits and
the
MCP Hi limit, setting new values for the next plateau, and (5)
adding
a fold test at 300V below the nominal MCP voltage. The recovery
consists
of four separate procedures (visits) and they must be completed
successfully
and in order. They are: (1) a signal processing electronics
check,
(2) 1st high voltage ramp-up to an intermediate MCP voltage of
-1500
V with limits modifications and voltage plateaus, (3) 2nd high
voltage
ramp-up to an intermediate MCP voltage of -1750 V (300 V below
the
nominal MCP voltage) with limits modifications and voltage plateaus
followed
by a fold distribution test, and (4) a final high voltage
ramp-up
to the full operating voltage, again with limits modifications
and
voltage plateaus, followed by a fold distribution test. During the
1st
high voltage ramp- up, diagnostics are performed followed by a dark
exposure.
During the 2nd and 3rd high voltage ramp-ups, diagnostics are
performed
followed by a dark, flat field ACCUMs, and a fold analysis
test.
All required parameters are defined in 07-248 FUV and NUV SMOV
Ramp-up
Parameters Excel workbook. Supports Activity STIS-18.
WFC3
11426
UVIS
SMOV Contamination Monitor
The
UV throughput of WFC3 during SMOV is monitored via weekly standard
star
observations in a subset of key filters (as many as will fit into a
single
orbit but to include at a minimum F218W, F225W, F275W, and
F606W).
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. In addition, a small set of internal exposures
are
included with the externals, to provide verification of detector
stability.
This
proposal corresponds to Activity WFC3-13.
WFC3
11798
UVIS
PSF Core Modulation
UVIS
shutter consists of two blades (or Sides). It rotates in one
direction,
so Side 1 and Side 2 alternately shade consecutive exposures.
The
shutter movement causes vibrations of the UVIS channel that affect
the
UVIS PSF peak in the short exposures. The peak-to-peak effect will
be
evaluated. Subarray images of a moderately bright, isolated star will
be
obtained with a series of increasing exposures times designed to
obtain
very high SNR in the central pixel of the PSF.
WFC3
11808
WFC3
UVIS Bowtie Monitor
The
UVIS detector was observed during ground testing to occasionally
exhibit
flat field and dark variations with a bowtie pattern. These
variations
are most significant as ~1% flat field (gain) variations
across
the field of view. It is believed that this represents a state or
condition
into which the detector can transition for reasons and under
circumstances
which are not currently understood. It is also very
unlikely
that most science observations will determine the state (bowtie
or
no-bowtie) of the detector. Ground test data indicates that this
state
is long lived (many hours to ~one day). Hysteresis or memory of
past
light exposure is also associated with this state.
Recent
evidence suggests that exposing the detector to ~200k to 500k
electrons
may quench this state. This proposal obtains an internal flat
field
sequence of three exposures: one at 10x full well with two at 0.5x
full
well immediately before and after. Each exposure is 3x3 binned to
reduce
the data volume required.
These
visits should be scheduled 2x per day until further direction is
provided.
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
05
05
FGS
REAcq
12
12
OBAD
with Maneuver
04
04
SIGNIFICANT
EVENTS: (None)