ACE Weekly 11/14/03 - 11/20/03

All ACE spacecraft subsystems are performing nominally. No attitude 
maneuvers were executed this reporting period. The next 
stationkeeping/attitude maneuver is scheduled for 11/21/03 (See Orbit Events).

============================================================================
Orbit Events:

(From Craig Roberts, FDF)
ACE stationkeeping maneuver (SK-30) is scheduled to coincide with the next 
attitude maneuver on 11/21/03. This will be our first SK burn since 
6/23/03. The delta-V will be of relatively modest size at approximately 33 
cm/sec. A delta-V of this size implies a continuous burn time of about 57 
seconds, and would consume roughly 0.223 lbm (0.101 kg) of fuel. The 
anti-Sunward direction of this delta-V will require the top deck jets 1A 
and 2A.

A few days after SK-30, the next SEZ transit will begin. Its particulars 
remain basically the same as previously given. Closest angular approach to 
the Sun will be approximately 0.58 degree closer than the September 
transit, which was 1.76 deg. To summarize the 24-day transit by epoch and 
SEV angle:

      26 Nov 20:56Z   4.75 deg (inbound)
       5 Dec 01:22Z    2.0 deg
       8 Dec 18:17Z    1.19 deg (minimum)
     12 Dec 19:27Z    2.0 deg
     20 Dec 22:00Z    4.75 deg (outbound)

=====================================================================
OCRs Executed:

None.

=====================================================================
Ongoing Activities:

TAPS:
Release 4.1.11 was delivered on 11/19/03 and is currently being tested by 
the FOT.  The SUG is currently being reviewed by the FOT and SGT.

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Automation (ROBOTT):

- ROBOTT version 0.2 (Offline) is operational on String 1.
- ROBOTT Version 0.3 was installed on String 2 (11/05/03) following the FOT 
verification of fixed Offline and HSM DRs on String 3. The FOT is currently 
testing the release on String 2.
- Command & Control is still being tested by the Automation team and the FOT.
- The first draft of the SUG is expected soon.

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

DOY 03318 (11/14/2003) ACE Anomaly G03-0115 - TPOCC Error Message - 
Received a message that "snap error ace_cmdstat terminated prematurely", 
while running G_END_DAY.  IMPACT:  None.  The cmd_stat page printed nominally.

DOY 03321 (11/17/2003) ACE Anomaly G03-0116 - GDS 34m (DSS-27) Transmitter 
Problems
At 16:12:04, DSS-27 informed ACE FOT that they were having transmitter 
problems, a technician was sent out to the site, and they should be up 
momentarily.  Telemetry online at 16:24:25 but no command 
capability.  Command capability established at 16:44:27.   IMPACT:  Delayed 
pass activities.  All telemetry was subsequently recovered.  DR# G103696

DOY 03324 (11/20/2003) ACE Anomaly G03-0117 - GDS 34m (DSS-27) Transmitter 
Problems
At 15:40, DSS-27 informed the FOT that there were problems with the 
transmitter.  No ETA was given as to when the problem would be 
fixed.  Obtained a Short Tracking Pass with Station 46 from 1950 (BOT) to 
2125 (EOT).  IMPACT:  No pass activities were performed during the 
scheduled Station 27 pass.  DR# G103722

DOY 03324 (11/20/2003) ACE Anomaly G03-0118 - GDS 34m (DSS-27) No Telemetry 
Online
Telemetry was not online from DSS-27 until 17:55.  At the beginning of the 
pass, DSS-27 had data type 78 online but the MOC didn't see any coming into 
the system.  After troubleshooting both JPL and NASA networks DSS-27 
switched to data type 78 and the MOC finally received telemetry.  No 
command capability because of the concurrent transmitter 
problem.   IMPACT:  No pass activities were performed during the scheduled 
Station 27 pass.  All telemetry recovered on later passes. DR # N101618


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~