ACE Weekly 06/05/2013 - 06/11/2013

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type         Attitude
	Date         06/11/2013
	DOY          162 2013
	Thrusters    2R 4R+ 4R-
	Duration     6:37 min
	Start        18:54:11z
	Stop         19:00:48z
	HGAStart     -8.84 deg
	HGAStop      +8.96 deg
	SunStart     14.38 deg
	SunStop      18.19 deg
	SpinStart    4.9489 rpm
	SpinStop     4.9504 rpm
	Nutation      0.07 deg
	Firing          33 pulses
	FuelUsed       0.1096 lbm
	FuelRemain   113.6984 lbm
	FinalSCMass  1347.958 lbm

The next attitude maneuver is scheduled for Tuesday 06/18/2013.

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OCRs:

DOY 162 (06/11/2013) 1836-1846z & 2133-2136z  SIS-055  14 cmds
The SIS instrument team performed a 2.75 hour test with the >30MeV
proton rate replaced with the heavy ion rate in the real-time solar wind
data (http://www.swpc.noaa.gov/ace/SIS_7d.html).  The heavy ion rate may
be useful for some real-time solar wind users (e.g. the MUOS-2 launch
scheduled 7/19/2013).  During the Tuesday test, the heavy ion rate
processed by SWPC (Space Weather Prediction Center) was ~0.115
counts/cm2-s-sr instead of the expected value of ~0.003.  The instrument
team will analyze the recorded data, which will be dumped on the
following pass.  It is possible that the algorithm used by SWPC may need
to be modified.  At the end of the pass, the SIS instrument was returned
to the nominal configuration with >30MeV proton rate in RTSW.


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Activities:

Data Capture:  100%  DOY 153-160 2013

Last week's report mentioned that the WS1 ground receipt time was ~0.38
seconds behind DSN.  Further investigation found that this had always
been the case, but only for low-rate data.  Previously, only the ground
receipt time for high-rate data had been compared (DSN vs. WS1).  The
high-rate ground receipt times agreed enough for ACE clock calibration.

The ACE clock calibration software can be updated it to handle the extra
delay for WS1 at low-rate.  Of course, in a typical pass, the spacecraft
is at low-rate for only a brief period of time, so there has been
negligible impact in previous clock calibrations.  It was only during
the 5/29/2013 command test when the spacecraft was kept at low-rate for
the entire test that the extra delay was noticed.


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Anomalies:

None