ACE Weekly 11/28/03 - 12/04/03
All ACE spacecraft subsystems are performing nominally. A successful
stationkeeping/attitude maneuver was executed 12/03/03. The next attitude
maneuver will occur on 12/18/03.
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Orbit Events:
The SEZ transit has begun. 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)
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OCRs Executed:
None.
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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.
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Anomalies:
DOY 03332 (11/28/2003) ACE Anomaly G03-0119 - TPOCC (AC1FE1A) Displays Crashed
AC1FE1A crashed 3 minute into the pass, when an attempt was made to bring
up display pages. However, telemetry continued to flow without any problems
for the remainder of the pass.
DOY 03333 (11/29/2003) ACE Anomaly G03-0120 - TPOCC Error Message
Received a message that "snap error ace_cmdstat terminated prematurely",
while running G_END_DAY. The same problem occurred on DOY 03318 - AR#G03-0115.
DOY 03336 (12/02/2003) ACE Anomaly G03-0121 - GDS 34m (DSS-27) Antenna Problem
At 15:29:00 DSS-27 informed the ACE FOT that they were having antenna
problems and would not be able to bring carrier up on time. At 15:46:17
DSS-27 had carrier up with no telemetry online. At 15:47:10 telemetry was
online. IMPACT: Delayed pass activities. All telemetry was subsequently
acquired. DR# G103782
DOY 03338 (12/04/2003) ACE Anomaly S03-0027 - SEPICA SSD 2 Temp Yellow High
Violation
Mnemonic SSSSSD2T violated its Yellow High limit 10 times. Mark Popecki
notified. IMPACT: Unknown. FOT is awaiting further instructions from the
PI. FOT will continue to monitor.
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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
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