ACE Weekly 05/13/2009 - 05/19/2009

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        05/15/2009
	DOY         135 2009
	Thrusters   2R 4R+ 4R-
	Duration    15:14 min
	Start       14:35:08z
	Stop        14:50:22z
	HGAStart    -7.34deg
	HGAStop     +7.48deg
	SunStart    15.93deg
	SunStop      5.36deg
	SpinStart    5.0113rpm
	SpinStop     5.0164rpm
	Nutation     0.19deg
	Firing      77 pulses
	FuelUsed      0.2487lbs
	FuelRemain  143.2060lbs
	FinalSCMass 1377.466lbs

The next attitude maneuver is scheduled for Tuesday 05/26/2009.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 130-137 2009

There was no pass on DOY 134.  There was only 40.5 hours between the
passes on DOY 133 & 135.  Since the SSR capacity is 43 hours, an SSR
failover was avoided and data capture remains 100%.

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Anomalies:

Update on AR#G09-0027  DSS-27 Red
DSS-27 returned to service on Friday May 15.  An ACE pass with DSS-27
was successfully completed on Sunday May 17.  During the 3-week
downtime, 14 of 22 ACE passes were with DSS-27 that needed to be
rescheduled.  There were 2 days without passes, however no data loss
occurred during this time.  Note, ACE playback is initiated via ground
command (as opposed to spacecraft load).  This gives ACE considerable
flexibility in moving automated passes.


DOY 133  05/13/2009  S-ACE-0437  G09-0032  DSS-46 Fire Alarm
Ground station antenna experienced a fire alarm.  Antenna was stowed
(2323z) and the area was confirmed clear of fire.  Telemetry and uplink
restored by 2341z.  DR#C106927
IMPACT:  18 minute outage.  Refer to AR#G09-0033 for further impacts.

DOY 133  05/13/2009  S-ACE-0438  G09-0033  ROBOTT Failure
For unknown reasons, the ACE MOC automation software (ROBOTT) did not
resume after a telemetry/command outage (AR#G09-0032).
IMPACT:  SSR redumps and final state-of-health checks were performed on
the following pass.

DOY 135  05/15/2009  S-ACE-0439  G09-0034  TAPS2 Data Capture Failure
The trending software (TAPS) data capture daemon stopped receiving
telemetry data on DOY 135 and was restarted on DOY 138.  The data
capture daemon occasionally fails when work on the network is being
performed.  This last occurred 03/05/2009.
IMPACT:  Minimal.  The data was copied from TAPS1.

DOY 135  05/15/2009  S-ACE-0441  G09-0036  AC3WS1 Power Supply Failure
The power supply on ac3ws1 failed.  Hardware maintenance replaced the
power supply.
IMPACT:  Minimal.  String 3 was not being used for operations.

DOY 138  05/18/2009  S-ACE-0440  G09-0035  DSS-54 Network Problems
Problems with the station's Enhanced Reliable Network Server (ERNS1)
caused a telemetry outage (1631-1638z).  DR#M105355
IMPACT:  Minimal.  7 minute telemetry outage.  SSR playback had already
completed.