ACE Weekly 03/31/2010 - 04/06/2010

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        03/31/2010
	DOY         090 2010
	Thrusters   2R 4R+ 4R-
	Duration    14:56 min
	Start       14:28:59z
	Stop        14:43:55z
	HGAStart    -6.65deg
	HGAStop      7.90deg
	SunStart    15.43deg
	SunStop      5.88deg
	SpinStart   5.0518rpm
	SpinStop    5.0539rpm
	Nutation     0.03deg
	Firing      76 pulses

The next attitude maneuver is scheduled for Friday 04/16/2010.

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OCRs:

DOY 098 (04/08/2010)  MMOC-0129  DSN Time Tag First Bit
Since launch, DSN had been time tagging the last bit of ACE telemetry
frames for the Earth Receipt Time (aka Ground Receipt Time).  To be
consistent with the SLE protocol, DSN will be using a new table (FB161)
that will tag the first bit of each telemetry frame (starting Thursday
04/08/2010).  The delays used for calculating the clock calibration have
been adjusted appropriately.  There will be no change in the clock
reports sent to the ACE Science Center (ASC) or NOAA Space Weather
Prediction Center (SWPC).

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Activities:

Data Capture:  100%  DOY 094-101 2010



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Anomalies:

DOY 096  04/06/2010  S-ACE-0496  G10-0019 ITOS tlmClient Memory Leak
The ITOS developers had known about a memory leak with tlmClient in ITOS
803-3.  It had not, however, been seen with ACE or WIND.  It appeared
for the first time on DOY 096.  Oddly, it only affected the real-time
data stream, not the playback data stream.  The real-time tlmClient was
restarted each time it died; 8 times during the 3.5 hour pass.  The ITOS
developers have fixed the problem in ITOS 804-7.  The FOT is reviewing
the software for delivery.
IMPACT:  Manual intervention required to reconnect ITOS to the real-time
data stream.