ACE Weekly 03/12/2014 - 03/18/2014

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type         Attitude
	Date         03/18/2014
	DOY          077 2014
	Thrusters    2R 4R+ 4R-
	Duration     9:06 min
	Start        12:44:28z
	Stop         12:53:34z
	HGAStart     -8.57 deg
	HGAStop      +8.85 deg
	SunStart     16.96 deg
	SunStop      13.02 deg
	SpinStart    4.9833 rpm
	SpinStop     4.9846 rpm
	Nutation      0.19 deg
	Firing       46 pulses
	FuelUsed       0.1471 lbm
	FuelRemain   108.2312 lbm
	FinalSCMass  1342.491 lbm

The next attitude maneuver is scheduled for Tuesday 03/25/2014.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 068-075 2014

The Near Earth Network continues to perform range tests in order to
analyze the Doppler bias with the Flight Dynamics Facility.
	03/14/2014  073  1810-1940  WS1

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Anomalies:

DOY 066  03/07/2014  S-ACE-0675  G14-0003  DSN Monitor Data blocked
After the pass on Friday 3/7/2014, the IP address of DSN's Monitor Data
system was changed.  Since the data is sent via UDP, the MMOC software
does not need to know the IP address of the system sending the data.
However, the MMOC firewall is configured to only allow specific IP
addresses and blocked the incoming DSN Monitor Data.  This was fixed on
3/18/2014.
IMPACT:  Minimal.  Ten days of DSN Monitor Data were not saved.
Background Info:  DSN Monitor Data includes information on the downlink
signal strength.  This information is not used for daily operations, but
is used for long-term analysis.  For example, it is used for determining
how far the spacecraft antenna can be turned away from Earth while
maintaining a sufficient RF link.  


DOY 071  03/12/2014 S-ACE-0677  G14-0005  DSS-15 Earth Receive Time
When DSS-15 re-acquired telemetry at the high data-rate, the station's
Earth Receive Time (ERT) was behind by 0.271 seconds when compared with
the spacecraft clock.  The ERT remained behind for the remainder of the
pass.  The DOY 071 clock calibration was recalculated with the invalid
ERTs removed.  DR#G114836
IMPACT:  Minimal.  The original clock calibration generated for DOY 071
corresponded to an error of 0.122 seconds per day.  This did not impact
the NOAA SWPC processing of ACE data.  The corrected clock calibration
report was resent on DOY 072.