ACE Weekly 10/11/2011 - 10/17/2011

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Friday 10/21/2011.

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OCRs:

DOY 285 (10/12/2011) MOCR 357 Return to Record During Pass
Starting on 09/07/2011, ACE stopped recording during passes in order to
reduce the amount of data on the SSRs (Solid State Recorder) and thereby
reducing the amount of antenna time needed during the first 3 weeks of
the GRAIL mission.  DSN antenna availability has increased as GRAIL has
reduced their usage and ACE has returned to recording during passes.
This eliminates the risk of unrecorded data loss when data gaps occur
during a pass.

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Activities:

Data Capture:  99.99%  DOY 282-289 2011
DOY 283 17:01:39-17:02:19  38 seconds  gap in pass, SSR not recording

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Anomalies:

DOY 285  10/12/2011  S-ACE-0630  G11-0056  CMD Corrupted During DSN Test
DSN Goldstone was testing the switching from commercial to generator
power and checking the integrity of local UPS systems.  There was a
power glitch at DSS-27 as a command was being transmitted to the
spacecraft.  The spacecraft flagged and discarded the corrupted command.
When the antenna tracking was restored, the ITOS mission software
retransmitted the command which was successfully received by the
spacecraft.  DR#G112035
IMPACT:  Activities delayed 10 minutes.  The spacecraft flags were
cleared with the TELLTALE_CLEAR command.

     ff 14 0a d0 1b 17 72 18   CMD sequence sent from MMOC
     ff 14 0a d0 e4 e8 8d e7   CMD sequence transmitted by DSN
                               Note the bit inversion after the 4th byte