ACE Weekly 12/02/2015 - 12/08/2015 All ACE spacecraft subsystems are performing as expected. ======================================================================== Attitude/Orbit: Type Attitude Date 12/08/2015 DOY 342 2015 Thrusters 2R 4R+ 4R- Duration 6:04 minutes Start 14:02:42z Stop 14:08:46z ra,decStart 254.93,-8.48 ra,decStop 260.51,-8.68 ra,decExpect 260.75,-8.81 Deviation 0.27 deg (-4.2%) HGAStart -8.91 deg HGAStop 9.05 deg SunStart 14.27 deg SunStop 15.17 deg SpinStart 5.0409 rpm SpinStop 5.0424 rpm Nutation 0.05 deg Firing 31 pulses FuelUsed 0.1006 lbm FuelRemain 94.0276 lbm FinalSCMass 1328.288 lbm Upcoming Maneuver Schedule: - Attitude maneuver: Tuesday, 12/15/2015 - Station-keeping maneuver: Tuesday, 01/05/2016 ======================================================================== OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 333-340 2015 ======================================================================== Anomalies: DOY 342 (12/08/15) SOAR S-ACE-45: Autonomy Bin Dump Miscompares - Autononmy Bin 41 miscompare notification received during daily end of pass state of health verification activities. IMPACT: No impact to automated pass operations. FOT verified correct autonomy bins were disabled (41) and enabled (42) based on current SSR in record (SSR B). The ace gri was updated nominally via automation during the DOY 343 contact. Background: - The SSR failover Bins (41 and 42) are enabled/disabled daily and the ACE ground reference image (GRI) is updated with the latest corresponding bin state. - Once the nominal SSR swap had occurred and SSR B had been placed in record, Bin 41 and Bin 42 were commanded on the S/C to disable and enable states, respectively. - The Bin 41 and 42 states were scheduled to be updated sequentially in the GRI. However, the Bin 41 GRI update process did not complete nominally. - A preliminary investigation suggests the ace_gri updating procedure encountered an (infrequent) execution issue due to the "race" conditions setup during the automated running of the ace_gri script (i.e, the Bin 41 GRI update process starts, but does not end before the start of the Bin 42 GRI update). - The FOT will submit a MOCR to update the operational procedure with a "WAIT until" completion condition. However, given the relatively low occurrence of this issue (last occurrence was on 2014 DOY 308) the procedure will be updated once the need for another procedure update is required.