ACE Weekly 04/08/2009 - 04/14/2009

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        04/14/2009
	DOY         104 2009
	Thrusters   2R 4R+ 4R-
	Duration    15:04 min
	Start       15:05:16z
	Stop        15:20:20z
	HGAStart    -7.37deg
	HGAStop     +7.74deg
	SunStart    15.70deg
	SunStop      5.72deg
	SpinStart   5.0042rpm
	SpinStop    5.0077rpm
	Nutation     0.08deg
	Firing      76 pulses
	FuelUsed      0.2460lbs
	FuelRemain  143.6800lbs
	FinalSCMass 1377.940lbs

The next attitude maneuver is scheduled for Friday 05/01/2009.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 095-102 2009

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Anomalies:

DOY 100  04/10/2009  S-ACE-0427  G09-0022  GSFC GMUG Data Problems
The GSFC GMUG was intermittently not forwarding ACE real-time telemetry
(VC1) to NOAA Space Weather Prediction Center (NOAA SWPC) and to the ACE
Science Center starting at Beginning Track (BOT=2015z High-Rate=2021z).
The NOAA team notified the ACE FOT at 2200z.  The ACE FOT notified
Goddard Comm Control.  Data started flowing to NOAA including old data
going back to 2115z.  However, real-time telemetry to the ACE MOC
stopped at 2222z.  At 2313z, the ACE MOC started receiving garbage data
on the VC1 line until the End Of Track at 2345z.  The data flow to the
ACE MOC was resolved before the next pass on DOY 101.  Goddard Comm
Control informed the FOT that no changes had been made.  Trouble Ticket
27073
IMPACT:  CDR data at DSN not impacted.  Final state-of-health checks and
SSR redumps were performed on the next pass (DOY 101).  See AR G09-0023
for the impact due to bad data to the ACE MOC.

DOY 100  04/10/2009  S-ACE-0428  G09-0023  Bad Data from GSFC GMUG
The GSFC GMUG was forwarding garbage data to the ACE MOC from 2313-2345z
(End Of Track).  TPOCC did not decommutate the telemetry but did save
bad time values used for Clock Calibration.
IMPACT:  The FOT tools discarded the bad clock calibration and the
reports for DOY 100 and DOY 101 were sent on Monday DOY 103.  It is
fortunate that TPOCC did not decommutate the garbage data.  The
automated procedures could have resulted in early termination of the
playback (data loss) or not returning the spacecraft to a nominal state
during final state-of-health checks.