ACE Weekly 01/02/03 - 01/08/04

All ACE spacecraft subsystems are performing nominally. A successful 
attitude maneuver was executed on 01/02/04. The next attitude maneuver will 
occur on 01/16/04.

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Orbit Events:

The next SEZ event will start around 02/22/04 and the minimum angle will be 
approximately 0.645 degrees.

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OCRs Executed:

None.

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Ongoing Activities:

TAPS:
Release 4.1.13 was delivered on 01/06/04 and is currently being tested by 
the FOT.  Open DRs have been prioritized by the FOT in preparation for 
transition.

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Automation (ROBOTT):

- ROBOTT version 0.3 (Offline) is operational on String 1.
- ROBOTT Version 0.4 has been installed on String 2 and is currently being 
tested by the FOT. This release included HSM, Offline, and Command & 
Control.   Testing of DRs fixed in Release 0.4 is progressing well.  The 
FOT has completed testing at the individual button level and is almost 
completed testing at the "Start Pre/Post Pass" button level. CRON testing 
of Release 0.4 should begin 01/13/04.  HSM is still having sporadic 
problems detecting true anomalies.  Both advisory and auto modes of C&C 
have been tested by the FOT. There seems to be some problems running C&C in 
auto mode, but this was expected.
- The only component not delivered to the FOT for testing is the Real-time 
Monitor.

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Anomalies:

DOY 04002 (01/02/2004) ACE Anomaly G04-0002  GDS 26m (DSS-16) MPA Problem
At approximately 14:52, DSS-16 called to verify that the spacecraft was at 
the high data rate of 87648 bps. The FOT verified that the spacecraft was 
at the high data rate. At 15:18, DSS-16 stated that they were in the 
process of rebooting the Metric Pointing Assembly (MPA) and possibly 
obtaining new predicts for the antenna. At 15:55, TimeTag Bin 1 kicked off 
to switch the spacecraft back to the low data rate. At 16:28, DSS-16 stated 
that the MPA problems were fixed. Data was online at 16:31:24. The FOT 
extended the EOT with DSS-16 to 20:00 to complete all pass 
activities.  IMPACT:  Delayed pass activities.  All data was eventually 
acquired.   DR #G103915

DOY 04003 (01/03/2004) ACE Anomaly G04-0003 - ROBOTT CRON Terminated
After all maneuver activities were completed and prior to commanding the 
spacecraft to Science all instances of TPOCC were killed.  When the pass 
was extended by the FOT, CRON was not killed. Thus at 18:35, CRON began all 
postpass activities on String 1 at 10 minutes after the original scheduled 
EOT time of 18:25. The remainder of the pass activities were successfully 
performed on the backup string, String 2.  IMPACT:  None

DOY 04004 (01/04/2004) ACE Anomaly G04-0004 - GDS 34m (DSS-24)  TCP Halt
At 15:29:03 ACE FOT noticed that telemetry was offline; Notified DSS-24 of 
situation. At 15:29:21  the command to load the LOS Time Tag Bin was sent; 
since telemetry was offline the command was retransmitted twice (2 extra 
cmd echo).  At 15:30:50, telemetry was back on line.  IMPACT:  Delayed pass 
activities.  All data was eventually acquired. DR #G102932.

DOY 04006 (01/06/2004) ACE Anomaly G04-0005 - MAD 26m (DSS-66) Bad 
Predicts/Late AOS
DSS-66 reported a signal strength of -146 just before BOT. The FOT 
instructed the station to reacquire the S/C. After obtaining new predicts, 
the station was able to acquire the S/C.   IMPACT:  Delayed pass 
activities.  DR# M102225

DOY 04006 (01/06/2004) ACE Anomaly G04-0007 - Monitor Sample Time (0158 
Data) Wrong
The FOT discovered the Monitor Sample Time in the 0158 Monitor Data is 
ahead 1 day. Further
investigations determined the problem has existed since 2004 and affects 
26M data only.  JPL was notified and is in the process of correcting the 
problem.  IMPACT: None



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
ACE Flight Operations Observatory Engineer
Honeywell Technology Solutions Inc.
Goddard Space Flight Center
Building 14, Room W10A
Mail Stop 428.2
Greenbelt, MD 20771

Office: 301-286-7071
Pager: 800-425-3174
Fax:    301-286-1729
Email: gamiller@pop500.gsfc.nasa.gov
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~