ACE Weekly 12/03/04 - 12/09/04

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

Maneuvers completed
	Type          Attitude         Station Keeping
	Date          12/06/04         12/06/04
	DOY           341 2004         341 2004
	Thrusters     2R 4R+ 4R-       3A 4A
	Duration      14:58 minutes    00:58 minutes
	Start Time    16:37:28z        18:38:48z
	Stop Time     16:52:26z        18:39:45z
	Firing        76 pulses        continuous

The next attitude maneuver is scheduled for 12/20/04.

The ACE Solar Exclusion Zone transit (SEV angle < 4.75�) ends on 12/09/04.
The minimum SEV angle for this transit was 0.83� (solar disc radius~0.26�).
DSN 34m stations and DSS-27 have had no problems acquiring downlink for
angles greater than 0.50�.  DSN 26m stations are not used for angles less
than 1.0�.  The next transit will be from 02/10/05 to 03/04/05 with a
minimum SEV angle of 1.44� on 02/21/05.  All subsequent SEV angles will be
greater than 1.0� and no further problems are expected until 2009 when the
SEZ transits begin again.


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OCRs Executed:

None

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Ongoing Activities:

ROBOTT
ACE transitioned to Lights Out Operations on 11/13/04. All nominal realtime
operations are now being performed using ROBOTT, with the exceptions of
maneuvers and special commanding.  20 DRs have been written for ROBOTT v0.9.

The ROBOTT developers have uncovered and are fixing a year rollover problem.
Since Week 1 starts on the first week with 4 days in the new year, it is
possible to have Jan 1, 2 and 3 in the previous year's final week (52 or
53).  The software currently deletes the previous year's schedule on Jan 2.
A temporary patch is being developed and will be implemented before the end
of the year.

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Extra Spacecraft Activities:

We have received a request from Jim Griffee (SWEPAM) to investigate the
possibility of commanding the SWEPAM-Ion instrument to collect certain data.
The goal is to characterize the instrument's spectral sensitivity to CEM
voltage steps, but doing so in the presence of an ever varying "calibration"
signal...the real-time solar wind.   A telecon was held on 12/07/04,
12/07/04, to further discuss the data collection requirements and the
feasibility of commanding the instrument to capture that data.

============================================================================
Anomalies:

DOY 338 (12/03/04) ACE Anomaly G04-0149  GDS 26m (DSS-16) CMD MOD Index
Incorrect CMD MOD Index delayed beginning of activities by 30 minutes.
IMPACT:  None.  Playback completed with 9 minutes to spare.  DR#G105031

DOY 340 (12/05/04) ACE Anomaly S04-0020  SWICS Limit Violations
SSCGRP28V2, SSCGR20V, SSCPAP5V and SSCPAM5V had brief red and yellow limit
violations between 07:03:49 and 07:40:14 during elevated solar activity.
Jim Raines Notified.  IMPACT:  Unknown

DOY 340 (12/05/04) ACE Anomaly G04-0150  GDS 26m (DSS-16) CMD MOD Index
Incorrect CMD MOD Index delayed beginning of activities by 40 minutes.
Problem resolved during off-shift by FOT contacting DSN from home.  IMPACT:
None.  Playback completed with 1 minute to spare.  DR#G105037

DOY 340 (12/05/04) ACE Anomaly G04-0151  Error in ROBOTT Notification
ROBOTT C&C notification for 'proc stalled' incorrectly states which proc is
stalled.  IMPACT:  Increased effort to isolate and resolve anomaly.
CDSID#21118

DOY 343 (12/08/04) ACE Anomaly G04-0152  Premature Procedure Start
ROBOTT/C&C did not complete results checking for the procedure
uleis_motor_error before starting the procedure s_ops_plbk_complete.  Two
minutes after starting s_ops_plbk_complete, results checking for
uleis_motor_error timed out and C&C killed all active procedures.  IMPACT:
Minimal.  Proc s_ops_plbk_complete was near completion when terminated.
CDSID#21122

DOY 343 (12/08/04) ACE Anomaly G04-0153  ROBOTT Continuous Loop
After the premature termination of s_ops_plbk_complete, C&C started issuing
the 'proc failed' message.  C&C did not start the proc 'g_end_day'.  After
C&C was resumed after EOT, C&C went into a continuous loop of (killp all,
/pause, /clear).  C&C was terminated and the proc 'g_acedown' was not
executed.  IMPACT:  Final spacecraft state-of-health check was not
completed.  CDSID#21123

DOY 343 (12/08/04) ACE Anomaly G04-0154  CMD Count Incorrectly Calculated
FOT pass summary tool incorrectly calculated the day's CMD Count since the
downlink format was Science at EOT (Science has the cmd counts in different
minor frames.)   IMPACT:  File manually updated.  MOCR 04-1112