ACE Weekly 07/05/2011 - 07/11/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Friday 07/15/2011.

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OCRs:

None


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Activities:

Data Capture:  96%  DOY 184-191 2011
6 hour 39 seconds 189-05:14:02 - 11:14:41  AR#G11-0048
31 seconds        191-06:11:49 - 06:12:19

The Chandra mission is in safe-mode
(http://cxc.harvard.edu/announcements/safemode_july2011.html).  The ACE
pass on Thursday 7/7/2011 (DOY 188) and on Saturday 7/9/2011 (DOY 190)
were deleted so that Chandra could have the antenna time.
Unfortunately, DSN problems during ACE's 2nd pass on Friday 07/08/2011
(DOY 189) resulted in 6 hours of data loss.  Reference AR#G11-0048.


The GRAIL mission is expected to launch 09/08/2011.  ACE has reduced DSN
antenna time during September.  The current schedule has ACE losing ~10%
data over 3 weeks in September.  The data loss will be greater if there
are problems with any of the passes.


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Anomalies:

DOY 189  07/08/2011  S-ACE-0621  G11-0048  JPL SLE TLM Provider Problems
The MMOC SLE software (MUS) was unable to bind to the JPL SLE TLM
Provider and generated the error message: "Returning to the unbound
state because the provider REFUSED this operation".  The FOT arrived in
the MMOC at BOT+90 minutes to investigate and reduce data loss.  The FOT
asked JPL to restart the ACE SLE TLM Provider process.  After the
restart, the MMOC SLE software was able to bind.  DR#N107474
IMPACT:  Activities delayed 95 minutes.  6 hours data loss.  The data
loss would have been 10 hours without FOT intervention.  The risk of
data loss was known when the antenna time was released for Chandra on
DOY 188 and DOY 190.  No impact to NOAA Space Weather Prediction Center
(SWPC) since the spacecraft remained in the Real-Time Solar Wind (RTSW)
format and was tracked by the NOAA antennas.