ACE Weekly 05/28/2008 - 06/03/2008

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        06/02/2008
	DOY         154 2008
	Thrusters   2R 4R+ 4R-
	Duration    13:52 min
	Start       17:09:01z
	Stop        17:22:53z
	HGAStart    -6.90deg
	HGAStop     +7.33deg
	SunStart    15.87deg
	SunStop      5.11deg
	Nutation     0.42deg
	Firing      71 pulses
	FuelUsed      0.2285lbs
	FuelRemain  149.6924lbs
	FinalSCMass 1383.952lbs

The next attitude maneuver is scheduled for Friday 06/13/2008.

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OCRs:

DOY 154 (06/02/2008)  GND-192 Discontinued - Two Person Commanding
The requirement for two-person commanding has been re-instated.  Two people
will again be required for maneuvers and special commanding.

DOY 155 (06/03/2008)  SEP-071 30kV Discharge Flag Cleared
The SBS30KVRESET command to clear the 30kV discharge flag was sent
17:10:59z.  The flag was set on DOY 146 2008 at 17:20:01z.  SSS30KV and
SSS30KI, however, remained at nominal values (4.04V and 41.5mA).

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Activities:

There have been no updates on the JPL ISO router problem that resulted in
several lost ACE passes in May (DOY 124-126 and DOY 134).

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Anomalies:

DOY 149  05/28/2008  S-ACE-0324  G08-0061  AC1WS1 Display Failure
AC1WS1 workstation monitor failed.  Hardware maintenance was notified and
replaced the monitor.
IMPACT: Hardware failures have increased in 2008 but have been manageable.

DOY 154  06/02/2008  S-ACE-0325  G08-0062  DSS-24 Communication to Exciter
At 1722z, DSS-24 lost commanding capability when communications to exciter
failed.  Station reset the exciter at and uplink was re-established at
1805z.  DR#G108644
IMPACT: Minimal.  No commanding was necessary during this time.  Redumps of
data gaps will be performed on the following pass.

DOY 154  06/02/2008  S-ACE-0326  G08-0063  AC3WS2 & AC3WS3 Display Failure
Two workstation monitors have failed.  Hardware maintenance has been
notified.
IMPACT: Hardware failures have increased in 2008 but have been manageable.