ACE Weekly 08/06/2014 - 08/12/2014 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 08/12/2014 DOY 224 2014 Thrusters 2R 4R+ 4R- Duration 8:29 min Start 16:37:46z Stop 16:46:15z ra,decStart 123.99,9.55 ra,decStop 130.38,6.32 ra,decExpect 131.51,5.92 Deviation 1.19 deg (-14% short) HGAStart -11.01 deg HGAStop +10.66 deg SunStart 18.55 deg SunStop 14.45 deg SpinStart 4.9904 rpm SpinStop 4.9922 rpm Nutation 0.11 deg Firing 43 pulses FuelUsed 0.1373 lbm FuelRemain 104.9620 lbm FinalSCMass 1339.222 lbm The next attitude maneuver is scheduled for Tuesday 08/19/2014. This week's attitude maneuver was again short (-14%). The extra buffer has been sufficient so that the next maneuver is still on Tuesday. The investigation continues. The catbed temperatures have not been rising as fast intermittently during these problem maneuvers. Several theories are being discussed, but we'll avoid putting the speculation into these weekly reports. ======================================================================== OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 215-222 2014 ACE data forwarding was unable to connect to the NOAA Space Weather Alternate Processing Site (APS) on Sunday 8/10/2014 and Monday 8/11/2014. NOAA SWPC was notified and the NOAA firewalls were corrected. This did not impact ACE data forwarding to the NOAA SWPC operations server. ======================================================================== Anomalies: DOY 224 08/12/2014 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 224 08/12/2014 DSS-24 -1 second 18:51:18 to 18:55:17z pending