ACE Weekly 08/13/2014 - 08/19/2014

All ACE spacecraft subsystems are performing as expected.

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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.

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OCRs:

None

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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.

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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.