ACE Weekly 07/09/2008 - 07/15/2008

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        07/14/2008
	DOY         196 2008
	Thrusters   2R 4R+ 4R-
	Duration    15:14 min
	Start       14:23:37z
	Stop        14:38:51z
	HGAStart    -6.91deg
	HGAStop     +7.37deg
	SunStart     5.65deg
	SunStop     12.71deg
	Nutation     0.20deg
	Firing      78 pulses
	FuelUsed      0.2486lbs
	FuelRemain  148.7560lbs
	FinalSCMass 1383.016lbs

The next attitude maneuver is scheduled for Friday 07/25/2008.

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OCRs:

None

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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).

The Multi-Mission Ops Center (MMOC) will test sending ACE commands to DSN's
Test Facility (DTF-21) on Wednesday 07/23/2008.  This test will occur at the
same time as the ACE's operations pass with DSS-66.

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Anomalies:

DOY 191  07/09/2008  S-ACE-0335  G08-0072  ROBOTT CRON Schedule
After configuring string 2 for operations, the cron schedule used by the
ROBOTT automation software did not contain the upcoming passes.  Reason
unknown.
IMPACT:  Minimal.  The ROBOTT Real-Time Monitor successfully started the
mission software before the pass started.  However, prepass activities
(clock calibration, backup, etc) needed to be performed manually.

DOY 193  07/11/2008  S-ACE-0336  G08-0073  DSN Station Change
DSS-26 was unable to support Stereo A (DR#G108699).  Stereo A was moved to
DSS-24 and ACE was moved to DSS-27.  The DSN schedule was updated at 1202z.
Unfortunately, the last check before the pass by the ROBOTT automation
software was 1145z.  The FOT discovered that SLE FCLTU was still connected
to DSS-24 at BOT (1355z).
IMPACT:  Manual intervention required to switch SLE to DSS-27.  DSN has been
asked to ensure they are using the most recent ACE contact information.

DOY 193  07/11/2008  S-ACE-0337  G08-0074  Commanding Delayed 60 minutes
FOT used incorrect syntax when manually reconfiguring SLE software to
DSS-27.  This also caused the ROBOTT software to move ahead in the
g_initial_contact procedure before commands had been received by the
spacecraft.  CIF 08-0001 has been written to document using UNIX directives
with ROBOTT.
IMPACT:  No commands were sent to the spacecraft for 1 hour.  The
g_initial_contact procedure was returned to the correct position and
commanding was resumed.

DOY 193  07/11/2008  S-ACE-0338  G08-0075  Offline Process Dead
Occasionally, UNIX processes terminate unexpectedly.  This occurred with the
offline process (data archive, cleanup, etc).  This last occurred 08/19/2006
AR#G06-0078.
IMPACT:  Minimal.  The offline process had already calculated redumps for
the following pass (none were needed) and the remaining cleanup activities
were performed on the following day when offline was executed.