ACE Weekly 11/21/2012 - 11/27/2012

All ACE spacecraft subsystems are performing as expected.  

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Orbit/Attitude:

	Type        Attitude
	Date        11/27/2012
	DOY         332 2012
	Thrusters   2R 4R+ 4R-
	Duration    9:13 min
	Start       21:34:23z
	Stop        21:43:36z
	HGAStart    -8.70deg
	HGAStop     +8.75deg
	SunStart    10.76deg
	SunStop     16.80deg
	SpinStart   5.0699rpm
	SpinStop    5.0719rpm
	Nutation     0.14deg
	Firing      47 pulses
	FuelUsed      0.1498lbs
	FuelRemain  117.7544lbs
	FinalSCMass 1352.015lbs

The next attitude maneuver is scheduled for Tuesday 12/04/2012.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 323-330 2012

The WS1 certification test on 11/27/2012 was successful (2nd of 3
scheduled).  The NOAA processing of SIS with data from WS1 has been
resolved by delaying the data by a few seconds.  A data flow issue with
the mmoc_fanout continues to be investigated, but that problem is
internal to the MMOC.

On 11/27/2012, NISN upgraded the network switches at VAFB for the
network that is used to send data from AFSCN to NOAA SWPC via the MMOC.
The VAFB SCD successfully connected to the MMOC.  But a full end-to-end
test will wait for NOAA SWPC to schedule AFSCN antenna time.

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Anomalies:

DOY 327  11/22/2012  S-ACE-0624  G11-0051  MUS CMD unable to BIND
The MMOC SLE (MUS) cmd process (ace-d27-cmd) generated the error "Cannot
send a BIND because of the following Anite error condition:
ace-d27-cmd's F-CLTU provider object could not thread off an Operations
server because".  This error last occurred on 10/01/2012.  MUS CMD was
restarted and no further problems occurred.
IMPACT:  Manual intervention required.  Activities delayed 22 minutes.

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Average Sun Angles With Weekly Attitude Maneuvers

Dates        Avg SEV  Avg Sun  Sun-SEV (indicates extra s/c tilt)
-----------  -------  -------  ----------------------------------
10/18-10/23  5.1deg   11.0deg  5.9deg
10/23-10/28  3.3deg    9.3deg  6.0deg
10/28-11/06  2.0deg    7.3deg  5.3deg
11/06-11/13  3.8deg    8.4deg  4.6deg
11/13-11/20  6.3deg   10.3deg  4.0deg
11/20-11/27  8.6deg   12.7deg  4.1deg

The SEV angle is currently increasing, which improves the average sun
angle.  Also, when ACE is directly above or below the sun-earth line,
the Sun-SEV angle will be greater (~6deg) compared to when ACE is in the
ecliptic plane (~4deg).  ACE passed through the ecliptic plane on
11/9/2012.

The following is background information that will be included in each
weekly report.
The project has accepted the SWEPAM team proposal to keep the spacecraft
at larger sun angles with weekly attitude maneuvers.  The SWEPAM-Ion
instrument has a series of channel electron multipliers (CEMs) and
larger sun angles allows more responsive CEMs to measure the solar wind.
The maximum sun angle follows the Sun-Earth-Vehicle angle (SEV).  The
SEV angle is determined by the size/shape of the orbit around L1.  When
the spacecraft antenna is pointed directly towards earth, the
spacecraft's sun angle will be equal to the Sun-Earth-Vehicle angle.
With weekly maneuvers, the sun angle can be kept ~6deg more than the SEV
angle.  This results in the spacecraft antenna aspect angle being kept
between 5 and 9 degrees and never pointing directly back at earth.  For
reference, the SWEPAM team prefers sun angles above 13 degrees.  With
the current size of the L1 orbit, the sun angle will be above 13 degrees
for ~45% of the time.