ACE Weekly 05/01/2012 - 05/07/2012

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type        Attitude
	Date        05/04/2012
	DOY         125 2012
	Thrusters   2R 4R+ 4R-
	Duration    22:06 min
	Start       14:25:57z
	Stop        14:48:03z
	HGAStart    -7.29deg
	HGAStop     +7.65deg
	SunStart     7.89deg
	SunStop      6.76deg
	SpinStart   5.0512rpm
	SpinStop    5.0580rpm
	Nutation     0.24deg
	Firing      112 pulses
	FuelUsed      0.3311lbs
	FuelRemain  122.0904lbs
	FinalSCMass 1356.351lbs

The next attitude maneuver is scheduled for Monday 05/14/2012.
Station-keeping #61 is scheduled for Friday 05/25/2012.


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OCRs:

None

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Activities:

Data Capture:  100%  DOY 120-127 2012

There were no problems from this weekend's Solar Exclusion Zone (SEZ)
transit with either DSN's DSS-27 antenna or NOAA's ~11m antennas.

Additional SEZ Info
The ACE Lissajous orbit is opening up after the sun crossing in February
2012.  This weekend's Solar Exclusion Zone (SEZ) transit had a minimum
Sun-Earth-Vehicle (SEV) angle of 0.67 degrees (sun radius=0.26 degrees).
The solar radio flux (10.7cm) ranged from 114-123 sfu.  The Signal to
Noise Ratio (SNR) for this weekend's passes with the DSN's DSS-27 ground
station were 8-9dB which is significantly more than is necessary (SNR
needs to be greater than -2dB).  Typical SNR values for DSS-27 are
10-15dB.

The next SEZ transit (August 2012) has a minimum Sun-Earth-Vehicle angle
at 1.2 degrees.  DSN 34m antennas and NOAA 11m antennas have not had any
problem with SEV angles greater than 1 degree.  Therefore, there will be
no further reporting of the Solar Exclusion Zone in these weekly reports
until the next sun crossing in 8 years -- 2020.

WS1 ranging tests on Tuesday 05/01/2012, Thursday 05/03/2012 and Friday
05/04/2012.  WS1 continues to analyze their ranging data from ACE.


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Anomalies:

None