SMOV Status & Planning Meeting Notes
5/28/09
-
Summary:
Observatory and instruments continue to perform nominally and according
to plan. The excess PCS gyro jitter, reported previously, appears to have little or no affect on
actual boresight jitter, which is ~ 2.5 mas, as measured by FGS and consistent with pre-SM4
predictions. For ACS, the SBC activation sequence and WFC Optimization Campaign have
both begun. STIS memory dump verification is underway. WFC3 science data buffer
verification data have been collected and analysis is proceeding.
- Observatory Status
o
PCS/SAC
 Evaluation of high vehicle jitter concluded;
• Upon further review, true vehicle (bore sight) jitter is as expected for
the G3456 configuration ( ~ 2-3 mas)
o Consistent with predictions pre-SM4 that G3 would not
contribute to jitter
o PCS tools have historically used VCL position path
(QDVTHEP) data as estimate of bore sight jitter
o RS148 16 Hz resonance corrupts VCL parameters, including
position path
o True bore sight jitter as measured by FGS is ~ 2.5 mas
• PCS tools will need to be modified to remove G3 high frequency
noise (low pass filter) for trending, along with addition of periodic
checks using FGS data for jitter calculations
• Request to reconfigure to G456 configuration for VDT2 interval to
observe high frequency disturbances (post gyro calibration)
• High frequency currently dominated by G3 noise, masking structure
disturbances
• Recommend that G345 be restored following VDT2 for remainder of
SMOV and continued science operations
o As true bore sight jitter is unaffected by G3 noise, no impact
to science
o G456 will be a relatively quiet configuration wrt true jitter
o Source of 16 Hz resonance is unknown and could be
indicative of life limiting characteristic of the gyro
o Noisy G3 signal could be problem with poor geometry 3 gyro
configs, reduced gyro ops
• For more info, see attached SMOV_PCS_May_28
 PCS performance is otherwise nominal
o
EPS


o
TCS




CPDU1CUR at 19.00 amps. Still flagging OOL. HSTAR? Yes.
• Still working on getting a good limit.
Battery performance still improving.
HSTAR on V3 equipment shelf this morning (1 count exceedence on 12
degree limit). Not surprising, will be trended.
SIC&DH duty cycle up to 50% due to ACS Optimization Campaign, running
at 56.7 degrees which was the predict.
Comm tray temperatures being trended as well.
MTE temperatures slightly warmer than expected. Analysis underway.
o
I&C

Nominal
o
DMS

Nominal.
o
486FSW
 Nominal
o
SAFING
 Nominal.
o
SIC&DH & P/L FSW
 Nominal.
 48 SBEs total so far, 8 more since last meeting.
- SI Status
o
WFC3
 Engineering
• Status; Protect Operate
nd
• 2 iteration of the Science Data Buffer verification completed
147/22:15 UTC. SSR dumps are down, verification by Payload FSW
is in-work;
• Over the last two days, six checks of WFC3 Buffer RAM have been
conducted during SAA passes. The Payload FSW team has
analyzed the memory dumps and no bit flips occurred.
• WFC3 remains operating nominally in its Protect Operate state.
• Tomorrow morning a repeat of the servicing mission functional test
will occur via stored commanding. This data will take the nominal
path to STScI via PACOR for analysis and will not be captured in
realtime.
• The next major activity for WFC3 will be transitioning out of its
Protect state and detector cooldown, tentatively scheduled for the
week of June 7th.
• Forward Plan
o Activation Test (re-execution of SM4 FT imaging) scheduled
for 149/13:00 UTC

o
COS

Science
• Nothing to add.
Engineering
• Status; Operate/FUV Operate
o Vacuum gauge ~4.7e-6 torr
• Forward Plan
st
o Initial NUV turn-on and signal processing check (1 of 3)
scheduled for 151/12:00 UTC
o OR to be submitted to clear COS event flag 2 following
successful NUV turn-on to allow further NUV commanding to
proceed.
o

To be submitted in coordination with STScI before
nd
~152/03:15 UTC and 2 part of the signal processing check
Science
• Nothing to add
• Keyes noted that the COS enclosure temperature has risen ~ 3 deg.
over the last 24 hours. Probably due to activations of other SIs.
o
FGS/OTA
 Status; all h/w nominal, no new HSTARS
 All 5 GSACQs in last 24 hours successful. 4 more over next 24 hours.
 For more info, see attached SMOV-OTA-May-28
 Recommendation to approve Ed Nelan’s request to modify proposal 11458.
o
ACS

Engineering
• Status;
o
o
o
•

Operate/SBC LV
SBC successfully turned on 148/03:10 UTC
Sci & Eng concur all nominal – OK to clear event flag
Oscilloscope mode optimization observations began
148/03:48 UTC
Forward Plan
o Oscilloscope mode optimization continues..
Science (Golimowski)
• WFC anneal (Prop 11367) is complete. We are awaiting data from
this Proposal, but initial bias and dark frames from fast-tracked
Optimization Campaign show that the number of hot pixels has been
significantly reduced from the levels seen in the Functional Test
data.
• The SBC turn-on (Prop 11370) is proceeding as planned. The first
phase (signal processing) has completed and verified. Authorization
for commencement of phase 2 has been given.
• Specific comments from Tom Wheeler:
ACS SBC Initial Turn-On Signal Processing Test - Prop11370, Visit 1
The SBC signal processing test commenced at 05/27/09 11:10pm
EDT and completed at 11:26pm EDT. I have reviewed the data and
have found that all voltages, currents, and temperatures are within
expected values. Also, when the threshold voltage was reduced to
0.28V, the number of ORCounts received (~15000 counts/second)
for the charge amp temperature (~12 dgC) is within the expected
value. The signal processing electronics appears to be alive and
functioning properly. From my examination, the first phase of the
SBC turn-on (the signal processing test) passed. I recommend that
Flag 2 be cleared to allow the next phase to proceed.
•
Iteration 1 of the Optimization Campaign commenced at 11:10 pm
last night. Four of 6 scheduled data dumps have been completed
(Visits G2, A1-A3).
o Fast-tracking of data through OPUS is running smoothly.
o Analysis of Performance Summary data commencing today.
o A daily status review with GSFC will occur at noon today.
o Checks of OPUS header keywords through first 3 data
dumps show that all commanding was nominal. Bias and
clock voltages are consistent with expectation,
notwithstanding the usual coarse telemetry.
 The most significant deviations from the expected
voltages are V_LG = -2.5 (instead of -3.0 V) and
V_RG (HI) = +8.4 V (instead of +8.0 V). The -0.5 V
discrepancy for V_LG is typical; the +0.4
V discrepancy for V_RG (HI) is larger than expected,
but not far outside the usual scatter in the telemetry.
o
STIS


o
-
NICMOS/NCS
 No change
P&S Status
o
o
-
Engineering
• Status; Operate/MAMAs 1&2 LVOn
• Memory Load/Dump verification completed at 148/06:40 UTC
• SSR dump is down, verification by Payload FSW is in-work
• Forward Plan
o Science Data Buffer verification scheduled for 149/19:11 –
20:45 UTC. Verification by Payload FSW to follow SSR
dump of data
o Mechanism Functional Test begins 152/01:20 UTC
st
o 1 FUV MAMA turn-on 153/11:35 UTC
Science
• STIS data will begin to be taken next week.
o The FUV MAMA recovery will be ongoing
throughout the week
o Several CCD internal and external programs will execute.
• The FUV MAMA turn-on data is fast-tracked
o but for the CCD data we will be relying on the archive.
• The first round of the CCD data will be taken between Tuesday,
June 2 and Friday, June 5.
o Goal to decide by COB on Tuesday June 9 whether it is OK
to proceed with the release for STIS CCD ERO and science
observations beginning June 15.
Calendar/SMS builds;
 SMS152
• TDRSS contacts being worked for required fast-track dumps
• Goal to deliver this afternoon
 SMS159
• TDRSS schedule will be worked on Monday
• Decision on targets for FGS AMA Iter 4 (day 159)
o On the basis of data from AMA “pre-visits” (151)
 KSembach asked for first external light for each instrument.
• Action to Carl
Replans
 None
Operations
o
FOT



o
o
Completed Ops Requests:
#18455-2 18455-2 Change Block Offset to 15 for SSR Sci P/B’s @
147/09:01z, 148/00:22z, 148/00:40z, 148/02:42z, 148/04:47z, 148/06:31,
148/07:17z
#18428-3 Cfg tasking order to collect SI MEM dumps @ 147/14:15z
&14:50z
#18457-1 Restore normal COS tasking orders @ 147/15:50z
#18459-0 Reset Safing Red Limits @ 147/19:43z


PACOR
 All nominal
 Pacor-A received four events with fast-track observations.
• The data was processed and delivered to OPUS without any
problems.
OPUS & Archive
 Starting early this morning, data for iteration 1 of the ACS optimization
campaign (proposal 11809) were fast-tracked
• No problems so far.
• Will continue fast-tracking data today and tomorrow
until iteration 1 is complete.