ACE Weekly 08/06/2014 - 08/12/2014

All ACE spacecraft subsystems are performing as expected.

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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.
 

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OCRs:

None

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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.

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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