ACE Weekly 04/26/2011 - 05/02/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        04/29/2011
	DOY         119 2011
	Thrusters   2R 4R+ 4R-
	Duration    11:54 min
	Start       14:00:41z
	Stop        14:12:35z
	HGAStart    -5.00deg
	HGAStop     +7.74deg
	SunStart    12.43deg
	SunStop      5.20deg
	SpinStart   5.0788rpm
	SpinStop    5.0808rpm
	Nutation     0.18deg
	Firing      61 pulses
	FuelUsed      0.1947lbs
	FuelRemain  129.4056lbs
	FinalSCMass 1363.666lbs

The next attitude maneuver is scheduled for Monday 05/09/2011.

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OCRs:

None


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Activities:

Data Capture:  100%  DOY 114-121 2011

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Anomalies:

DOY 117  04/27/2011  S-ACE-0606  G11-0033  ITOS Closed Inadvertently
During a training session, ITOS was inadvertently closed at the end of a
WIND pass, but in the middle of an ACE pass (1915z).  ITOS was restored
1.5 hours later.
IMPACT:  No solar wind data forwarded to NOAA Space Weather Prediction
Center for 1.5 hours.  Manual intervention required.

DOY 119  04/29/2011  S-ACE-0607  G11-0034  D27 Transmitter Trip Off
DSS-27's transmitter tripped off due to a power supply fault (1441z).
Downlink (non-coherent) re-established at 1445z.  Uplink re-established
at 1455z.  Subsequent commands to DSS-27 via SLE returned "command
negative: unable to process".  The SLE FCLTU needed to be manually
disconnected and reconnected.  The command negative problem last
occurred on 02/08/2011. (AR#G11-0012).  DR#G111413
IMPACT:  Minor data loss to NOAA Space Weather (~5 minutes).  Manual
intervention required for commanding.

DOY 120  04/30/2011  S-ACE-0592  G11-0021  ITOS tm_controller
Before Beginning Of Track, ITOS had problems connecting telemetry,
"timeout reading from tm_controller".  ITOS was stopped and restarted
and the ACE pass was taken successfully.  CDSID#00027515
IMPACT:  Manual intervention required.