HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT #4873
PERIOD COVERED: 5am June 23 - 5am June 24, 2009 (DOY
174/0900z-175/0900z)
OBSERVATIONS SCHEDULED:
COS23/FUV 11356
COS FUV Initial On-Orbit Turn-On
This proposal specifies the procedure for SMOV initial HV
turn-on and
ramp-up of the COS FUV detector. (The FUV will have been
commanded to
its Operate state to support execution of proposal 11353.)
The procedure
is detailed in the Observing Description, but in summary,
the following
is done: The initial transition from FUV Operate to HVLow
is broken into
two parts, with a gap of 4 hours between turning on the HV
and ramping
to the HVLow (SAA) voltage. This will be followed by 5
cycles of HV
ramp-up and return to HVLow. Cycles will ramp up to
successively higher
(magnitude) voltage, with the fifth cycle going to the
nominal operating
values. There will be a gap of at least 4 hours between
cycles. All HV
ramp-up will be done at 10 sec per HV "step".
The step rate and cycle
voltage values (for Segments A and B) must be patched in
FSW in each
cycle prior to the HV ramp commanding. Memory monitors
will be set on
the patched memory locations. Immediately after any HV
commanding, and 4
hours after ramp-up commanding, the DCE memory will be
dumped.
Immediately after HV ramp-up commanding higher than HVLow,
short DARK &
WAVE exposures will be obtained. Visits 01 and 02, and all
the
subsequent even numbered visits (the ones 4 hours after HV
ramp-ups),
end with NSSC-1 COS event flag 3 being set. If the flag
remains set,
subsequent FUV commanding will be skipped. Thus,
Operations Requests
must be in place to clear the flag prior to those
subsequent visits.
Real-time monitoring of the telemetry will be used to
guide the
decisions whether or not to clear the flag. The final
visit (13)
provides a scheduled final opportunity to clear flag 3,
and if the flag
is cleared, initiates nominal FUV HV commanding and
requests a DARK
exposure.
ACS/WFC 11369
ACS CCD functional test for WFC
During the ACS Repair (ACS-R) conducted during Hubble
Servicing Mission
4 (SM4), astronauts will install a CCD Electronics Box
Replacement
(CEB-R) and Low-Voltage Power Supply Replacement (LVPS-R).
A rudimentary
aliveness/functional test (AT/FT) will be conducted
on-orbit during SM4.
Shortly after SM4, the more comprehensive CCD function
test (FT) defined
in this program will be conducted as part of SMOV. This
program is
modeled after the original CCD functional test (HST
program 9005, PI
Mark Clampin) conducted following the initial installation
of ACS during
Hubble Servicing Mission
3B. This WFC-only proposal has a companion HRC
proposal 11396.
WFC3/IR 11420
IR Detector Functional Test
This program measures the baseline performance and operability
of the IR
detector using only internal observations: darks and
internal (WFC3
calsystem) flatfields. The images will be used to evaluate
readnoise,
dark current, gain, and cursory characterization of the
reference
pixels. Most data will be taken in default full-frame
readout mode
(four-amp, gain 2.5 setting), but in addition darks and
flats will be
taken in each of the 4 subarrays. A set of internal
flatfields will be
acquired to provide absolute gain measurements for each
amplifier at the
nominal setting (2.5 e-/DN).
WFC3 11421
WFC3 Channel Select Mechanism Test
The operation and positioning of the Channel Select
Mechanism (CSM) will
be verified for the WFC3 UVIS and IR channels. An extended
target will
be observed in both channels to verify that the field of
view is not
blocked or vignetted in any way when the CSM is set for
UVIS and IR
channel operations. Internal IR flat field images will
also be used to
verify the correct positioning of the IR diffuser paddle.
This proposal
corresponds to activity ID WFC3-08.
WFC3/UVIS 11424
WFC3 UVIS Initial Alignment
The corrector mechanism will be used to iteratively bring
the UVIS
channel of WFC3 into alignment with the OTA using phase
retrieval of
focus diverse star images over the field. Three visits are
required;
corrector offsets will be uplinked after each visit via
realtime
command.
This proposal is activity id WFC3-11
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are
preliminary reports
of potential non-nominal performance that will be
investigated.)
HSTARS:
11895 - ACS Suspended @ 174/16:19:58z
11896 - At 175/01:43:47 we received a search radius limit
exceeded on
FGS
3 before the scheduled start of the GSAcq. The GSAcq(1,3,3) was
scheduled
to start at 175/01:44:28, GSAcq(1,3,3) was successful
Observations
Affected, None
HSTAR for DOY 167:
11894 - A Loss of Lock occurred at 2009.167/00:11:34 while
guiding on P1S3D3.
COMPLETED OPS REQUEST:
18549-4 - COS Suspend Recovery @ 174/19:53z
COMPLETED OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS GSAcq 4
4
FGS REAcq 0
0
OBAD with Maneuver
4 4
SIGNIFICANT EVENTS:
Flash Report:
The COS successfully
completed it's recovery to Operate with the FUV
ramped to HVNom at 274/19:50.