ACE Weekly 12/09/2015 - 12/15/2015 All ACE spacecraft subsystems are performing as expected. ======================================================================== Attitude/Orbit: Type Attitude Date 12/15/2015 DOY 349 2015 Thrusters 2R 4R+ 4R- Duration 5:41 minutes Start 16:38:35z Stop 16:44:16z ra,decStart 260.28,-8.65 ra,decStop 265.46,-8.73 ra,decExpect 265.74,-8.83 Deviation 0.29 deg (-5.2%) HGAStart -8.91 deg HGAStop 9.00 deg SunStart 14.83 deg SunStop 14.85 deg SpinStart 5.0423 rpm SpinStop 5.0437 rpm Nutation 0.06 deg Firing 29 pulses FuelUsed 0.0947 lbm FuelRemain 93.9328 lbm FinalSCMass 1328.193 lbm Upcoming Maneuver Schedule: - Attitude maneuver: Monday, 12/21/2015 - SK-78 maneuver: January 2016 (Actual Date TBD) ======================================================================== OCRs: SIS OCR-64 (MOCR ACE-358): Raising Matrix detector thresholds on SIS Telescope A and disabling 5 noisy Matrix detector strips SIS RTSW rates have been showing increased noise since December 3, 2015. As a result of the approaching seasonal perihelion, Matrix detectors are getting warmer which causes more noise on their strips. Per SIS Team direction, the ACE FOT raised thresholds on all Matrix strips on Telescope A, and disabled the following 5 strips: M1AHV #26, 28, 44, 46 and M1BHV #45. SIS OCR-64 was implemented during the 2015 DOY 349 DSS-15 contact, following the successful completion of the weekly attitude maneuver. Note: SIS Team close evaluation of RTSW rates following the DOY 349 implementation indicates some of the matrix detector strips are still noisy. The SIS Team will monitor RTSW data over the upcoming weekend and develop another SIS commanding sequence to implement before the Holiday next week. ======================================================================== Activities: Data Capture: 99.998% DOY 340-347 2015 Note: 12-sec data gap during the carryover playback of 342:00:00:00 - 342:23:59:59 (unrecoverable). ======================================================================== Anomalies: DOY 349 (12/15/15) SOAR S-ACE-68: Late Acquisition due to Transmitter Problem (DR #G116803) A 34 minute and 2 second late acquisition occurred due to a transmitter problem at DSS-15 (Goldstone). The transmitter output power fluctuated between 100 W and 300 W, causing CLTU bind to be interrupted. Automated bind was attempted during the unstable power occurrence and was unsuccessful. After a recalibration was performed at the station, the carrier was brought up and the MMOC established commanding capabilities. IMPACT: Approximately a 30 minute delay on the start of the weekly attitude maneuver and the SIS instrument commanding (SIS OCR-64), in addition to 15.5 minutes of carryover playback for the next day (DOY 350).