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SMOV Status & Planning Meeting Notes 5/27/09
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Summary:

Observatory and instruments continue to perfor m nominally and according to plan. PCS continues to perfor m nominally with previously noted jitter . All other spacecraft subsystems are perfor ming well. WFC 3 and C OS science data buffer checks are completed and are nominal. AC S WFC CCDs have been successfully cooled the operating temperature of -81 deg. C . STIS has been recovered fr om Safe to Operate, per the revised plan.

- Observatory Status
o PC S/SAC The Po increas · · inting Contr ol System continues to per for m nominally with the ed jitter as noted in earlier meetings . Investigation into the source of the jitter is narrow ing in on Gyro 3. Data processing has shown that the 16.5 Hz frequency to be the most significant source of jitter . · See attached ppt. · Ops Request #18454 w as executed to collect 2 intervals of PN format data, providing high rate data for all 6 gyros . Looking forward · Initial thoughts are that this will pose no impact to the gyro calibration in mid-June. · If G3 is confirmed as the source of the increased jitter o desirable to remove it fr om the control law prior to the next VDT as it masks other s tructural modes near 16 Hz. o Long ter m mitigation may be possible by us ing a notch filter in FSW. JW irzburger. When do w e plan on turning Gyro1 and Gyro2 off? · Early week 4, post- BEA, and after gyro cal maneuvers Batteries topping 500 Ah every or bit. CPDU1CUR up to 17.2 at about 8:13 this morning, due to STIS being on again. · EPS will assess the load increase, and make recommendation, likely just a limit change All nominal. Bay 8 warmer than they have been, will compare with attitude. All Nominal All Nominal. Nine science dumps coming up.



o EPS

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TCS I&C DM S

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486FSW Nominal SAFING All nominal.


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SIC &DH & P/L FSW All nominal.

- SI Status
o WFC3 Engineering · The three W FC3 Buffer R AM dumps from las t evening have been processed; the repor t indicates that the W FC3 buffer has been loaded with zeroes; no bit flips occurred on any of the three tests executed. · More taking place today. Science · Nothing to add. COS Engineering · MKelly ; The 3 dump files from the "Load C OS Buffer W ith Zeroes" commanding this afternoon have been pr ocessed; no bit flips occurred on any of the three tes ts executed. The relevant pr oducts have been posted on the Payload FSW Web page and can be found by navigating the following links: COS - > Documentation: Software Ops -> FSW Analysis Repor ts -> 09147. This concludes COS science data buffer memory checks. Science · Nothing to add.

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FGS/OTA All hardw are nominal, H STAR #11845 was closed, ther e are no new HSTARs . There w ere 4 GSACQs spanning the previous 24 hours, all w ere successful. ACS Engineering · The AC S WFC TEC was enabled at 146/13:00 and suc cessfully cooled the W FC detec tor to its default operational temperature of 81dgC yes terday mor ning. (See attached pdf) · It took ~50 minutes for the TEC to reach a s table contr ol current draw of ~2.0amps and its initial operations show no anomalous behavior. · Event Flag 10 was then set via Ops Request 18447 (so stored commanding will skip AC S safing ac tivation at 147/04:24). · Anneal, all looks nominal. Back to operate in about 10 hours · The next activity for ACS is stored command recovery from H old to WFHROper with the WFC TEC enabled. The HRC TEC and HRC Backpowering w ill remain disabled (commanding block ed by Event Flags 7 and 9) . · SBC ac tivation is next. Science · Changes to SMOV Proposal 11510 ( External CTE Monitor) o Approved by a spec ial PIT meeting held on 26 May 2009. o The proposal had been revised to include

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exposures recorded in both available CDS readout modes (Dual- Slope Integrator and C lamp & Sample) better assess the relative effec ts of C TE and bias drift on ex ternal tar get images better infor m our upcoming decision over which CD S mode will be the default for Cycle 17 Proposal 11510 is affiliated with, but not str ictly part of, the AC S-R Optimization Campaign (OC). o Will be scheduled after OC Iteration 3, in 159 SMS

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STIS



Engineering · Came up safe- to-operate; all nominal. All temps and v oltages look good. · Working to forw ard plan Science · The team is happy to see STIS recovered from safe o Looking forward to seeing the data to be taken next week. · First internal lamp images will be taken on Tuesday June 2 between 04:00 and 0:605 UT.

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NICMOS/NC S N o c hang e

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P&S Status
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; Calendar /SMS builds; SMS152 · TDRSS suppor t is being worked SMS159 · PASS produc ts and TDR SS suppor t being worked Replans N one

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Operations
o FOT Completed Ops Requests : #18447-0 Set ACS Event Flag 10 so AC S does not Safe @ 146/14:30z, #18453-0 Restore normal AC S SD , tasking orders @ 146/14:35z #18454-0 PN for mat for Gyro D ata Collect @ 147/02:00z

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PACOR All nominal

OPU S & A rchive Last night more data for COS proposal 11354 wer e fast-tracked. Data for iteration 1 of the AC S optimization campaign ( proposal 11809) · will s tart coming dow n very early Thursday morning · will also be fast- tracked.