ACE Weekly 08/13/2014 - 08/19/2014 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 08/19/2014 DOY 231 2014 Thrusters 2R 4R+ 4R- Duration 8:53 min Start 16:52:44z Stop 17:01:37z ra,decStart 130.49,6.09 ra,decStop 137.32,3.09 ra,decExpect 138.51,2.75 Deviation 1.24 deg (-14% short) HGAStart -10.86 deg HGAStop +10.68 deg SunStart 19.19 deg SunStop 14.86 deg SpinStart 4.9921 rpm SpinStop 4.9925 rpm Nutation 0.16 deg Firing 45 pulses FuelUsed 0.1430 lbm FuelRemain 104.8192 lbm FinalSCMass 1339.079 lbm The next attitude maneuver is scheduled for Tuesday 08/26/2014. ======================================================================== OCRs: None ======================================================================== Activities: Data Capture: 99.988% DOY 222-229 2014 DOY 226 04:18:46-04:18:52 7 seconds lost gap during redump DOY 226 04:18:56-04:19:27 32 seconds lost gap during redump DOY 226 11:28:00-11:28:30 31 seconds lost SSR Failover Thanks to the Chandra mission and DSN Maintenance for providing time on DOY 226 for recovering 2.5 hours of data that would have been lost. (See anomaly report below). ACE data forwarding was unable to connect to the NOAA Space Weather Alternate Processing Site (APS) on Tuesday 8/19/2014. NOAA SWPC was notified and the problem was corrected. This did not impact ACE data forwarding to the NOAA SWPC operations server. FDF provides 28 day text ephemeris to NOAA SWPC for space weather processing. The previous 2 files (7/31 and 8/18) covered an old time range (7/17-8/14). NOAA SWPC notified the team of the issue on 8/19/2014 and FDF resolved the problem the same day. ======================================================================== Anomalies: DOY 225 08/13/2014 S-ACE-0685 G14-0012 DSS-65 Antenna red DSS-65 was red due to a problem with the Antenna Drive Cabinet that prevented the antenna from moving. DR#M108243 IMPACT: The playback from the previous day (Tuesday 8/12/2014 DOY 224) had not been completed (missing DOY 224 1530-1700z). An SSR failover at 1128z on Thursday (8/14/2014 DOY 226) would have overwritten that data. Chandra and DSN Maintenance provided time on DSS-54 so that the 2.5 hours could recovered. Short gaps while catching up and during the SSR failover resulted in ~2.5 minutes of data loss. DOY 227 08/15/2014 S-ACE-0676 G14-0004 Backup NAS RAID disk fail The backup NAS RAID hard disk drive #3 failed (Synology Model DS410). The disk was replaced on 8/15/2014 and the redundancy rebuilt on 08/18/2014. The last disk failure occurred on this RAID 1/31/2014. IMPACT: Minimal. No data is lost for a single disk failure. Since this is a backup, there would be no data loss if 2 or more disks failed.