ACE Weekly 07/23/2014 - 07/29/2014 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 07/29/2014 DOY 210 2014 Thrusters 2R 4R+ 4R- Duration 11:30 min Start 17:30:25z Stop 17:41:55z ra,decStart 112.28,27.37 ra,decStop 116.25,18.63 ra,decExpect 117.37,17.18 Deviation 1.80 deg (-16% short) HGAStart -10.49 deg HGAStop -6.41 deg SunStart 17.45 deg SunStop 6.41 deg SpinStart 4.9912 rpm SpinStop 4.9910 rpm Nutation 0.10 deg Firing 58 pulses FuelUsed 0.1799 lbm FuelRemain 105.3096 lbm FinalSCMass 1339.570 lbm The next attitude maneuver is scheduled for Tuesday 08/05/2014. The attitude maneuvers (7/21, 7/29 and 8/5) are longer than usual as we cross the ecliptic plane (~8/7/2014). This week's attitude maneuver was again short. The investigation continues. The extra buffer is sufficient so that the next maneuver is still next Tuesday. Date Actual ra,dec Expected ra,dec deviation short (%) 04/01/2014 18.95 -5.15 19.18 -5.06 0.25 deg -3% 04/08/2014 27.53 -0.69 27.76 -0.74 0.24 -2% 04/15/2014 36.18 2.70 36.37 2.52 0.26 -1% 04/22/2014 44.93 5.96 45.12 5.83 0.23 -1% 04/29/2014 54.60 12.03 54.87 11.87 0.31 -1% 05/06/2014 60.45 26.36 60.85 27.05 0.78 -5% 05/13/2014 63.39 32.25 63.78 33.05 0.86 -12% 05/20/2014 69.49 35.51 70.20 35.72 0.61 -9% 05/27/2014 76.45 37.45 76.99 37.51 0.43 -7% 06/03/2014 82.17 39.11 82.40 39.11 0.18 -3% 06/10/2014 91.99 38.97 91.84 39.06 0.15 +2% 06/17/2014 95.60 39.71 95.96 39.70 0.28 -8% 06/24/2014 101.96 39.24 102.16 39.13 0.19 -3% 07/01/2014 108.48 38.10 108.74 37.98 0.24 -4% 07/08/2014 114.35 36.62 114.77 36.37 0.42 -7% 07/15/2014 118.89 35.15 119.48 34.81 0.59 -12% 07/21/2014 112.43 27.58 111.98 26.45 1.32 -11% 07/29/2014 116.25 18.63 117.37 17.18 1.80 -16% ======================================================================== OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 201-208 2014 ======================================================================== Anomalies: DOY 207 07/26/2014 S-ACE-0684 G14-0011 DSN Earth Receive Time Additional instances of DSN's Earth Receive Time being behind by 1 second continues. DSN believes the problem to be a synchronization problem between the TCT (Time Code Translator), DCC (Downlink Channel Controller), and RRT (Receiver, Ranging, and Telemetry). DSN has assigned Anomaly Number 118875 to this problem. DSN has linked this problem to one found with Voyager (DR#N109529) IMPACT: Since the ERT deviation is short (~3 minutes), it has negligible impact on the clock calibration report sent to ASC and NOAA SWPC. DOY Date Station ERT behind duration DSN DR# 197 07/14/2014 DSS-65 -1 second 15:30:44 to 15:38:16z 201 07/20/2014 DSS-15 -1 second 16:11:48 to 16:14:45z N109669 207 07/26/2014 DSS-24 -1 second 14:45:48 to 14:48:30z N109670