ACE Weekly 07/16/2014 - 07/22/2014

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type          Attitude
	Date         07/21/2014
	DOY           202 2014
	Thrusters     2R 4R+ 4R-
	Duration      10:54 min
	Start         14:30:31z
	Stop          14:41:25z
	ra,decStart  118.67,35.16
	ra,decStop   112.43,27.58
	ra,decExpect 111.98,26.45
	Deviation      1.32 deg
	HGAStart     +11.01 deg
	HGAStop       -4.61 deg
	SunStart      14.85 deg
	SunStop       10.43 deg
	SpinStart    4.9893 rpm
	SpinStop     4.9914 rpm
	Nutation       0.20 deg
	Firing        55 pulses
	FuelUsed       0.1715 lbm
	FuelRemain   105.4896 lbm
	FinalSCMass  1339.750 lbm

The next attitude maneuver is scheduled for 07/29/2014.

ACE will cross the ecliptic plane next month (~8/7/2014).  For the next
3 weeks (7/21, 7/28, 8/4), each maneuver will turn the spacecraft
antenna closer to Earth, resulting in a better downlink signal strength.
Between each maneuver, the spacecraft will "drift" away from earth to an
11 degree antenna angle with the reduced downlink signal strength.  This
continues to maximize the spacecraft sun angle (OCR ACE-285 CDS-051
10/18/2012) as the spacecraft is turned from pointing above the ecliptic
plane to below the ecliptic plane.

This week's attitude maneuver was off by 1.32 degrees (~ -11% short).
The investigation into the maneuvers not reaching the target continues.
The "drift" buffer has been increased an additional day to allow for the
intermittent short maneuvers.
 
   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%


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OCRs:

None

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Activities:

Data Capture:  100%  DOY 187-194 2014

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Anomalies:

None