ACE Weekly 02/20/2008 - 02/26/2008

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        02/20/2008
	DOY         051 2008
	Thrusters   2R 4R+ 4R-
	Duration    15:42 min
	Start       13:49:02z
	Stop        14:04:44z
	HGAStart    -8.20deg
	HGAStop     +7.56deg
	SunStart     6.21deg
	SunStop     16.68deg
	Nutation     0.23deg
	Firing      80 pulses
	FuelUsed      0.2550lbs
	FuelRemain  151.3136lbs
	FinalSCMass 1385.573lbs

The next attitude maneuver is scheduled for Thursday 03/06/2008.

Note that the pre-maneuver HGA aspect angle was 8.2 degrees.  The High-Gain
Antenna performance continues to behave as expected.  At this angle, the
downlink SNR drops by approximately 2dB per degree.  Beyond 10 degrees, the
antenna performance drops precipitously.

           HGA Angle   Downlink SNR (26m DSS-66)
preman     -8.20deg     7.5dB
postman    +7.56deg     8.8dB

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OCRs:

None

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Activities:

None

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Anomalies:

Update G08-0019 AC1WS3 failure
Operations continue on String 3 while waiting for String 1 configuration
after the workstation failure.

Update G08-0024 DSS-27 Red DOY 050
The SSR failover resulted in a 32 second gap (2008-051 10:39:47-10:40:18);
no clock calibration reports for DOY 050 and 051; and no attitude/orbit
report for DOY 050.  Unfortunately, no additional DSN time was available and
SSR playback was not caught up until Saturday DOY 054.