ACE Weekly 01/29/2014 - 02/04/2014

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type         Attitude
	Date         02/04/2014
	DOY          035 2014
	Thrusters    2R 4R+ 4R-
	Duration     9:43 min
	Start        16:00:02z
	Stop         16:09:45z
	HGAStart     -8.17 deg
	HGAStop      -5.05 deg
	SunStart     14.98 deg
	SunStop       9.92 deg
	SpinStart    4.9751 rpm
	SpinStop     4.9769 rpm
	Nutation      0.12 deg
	Firing       49 pulses
	FuelUsed       0.1560 lbm
	FuelRemain   109.0552 lbm
	FinalSCMass  1343.315 lbm

The next attitude maneuver is scheduled for Tuesday 02/11/2014.

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OCRs:

DOY 035 (02/04/2014) 1534z  SIS-062  1 cmd
On 1/27/2014 (OCR SIS-061), the instrument team tested a scenario for
increasing the number detector strips with larger thresholds.  From the
instrument team: The test did not produce desired results.  We will
further analyze both the data and flight software in order to find out
why the test didn't work, but in the meantime we need to restore the
instrument state.

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Activities:

Data Capture:  100%  DOY 026-033 2014

Antenna time is less of a problem now, compared to the beginning of
January.  During the winter months, the northern hemisphere antennas (9
out of 12 DSN antennas) have less view on ACE and other sunward
missions.  Also there had been a series of DSN problems that have
improved.  The new moon (Thursday 1/30/2014) is usually a problem, but
LADEE has been reducing their coverage to ~90 hours per week.  A WS1
pass was taken on 1/27/2014 to get an additional 2 hours of antenna
time.

The Near Earth Network continues to perform range tests in order to
analyze the range bias with the Flight Dynamics Facility.
	01/29/2014  1705-1825z  9m Santiago
	01/31/2014  1500-1900z  9m Santiago
	02/01/2014  1425-1615z  WS1
	02/02/2014  1435-1515z  WS1
	02/03/2014  1615-1745z  9m Santiago

FDF reported that the regular (non-testing) WS1 pass on 1/27/2014 had a
larger range bias than normal.

On 12/16/2013, ACE Science Center (ASC) notified the FOT that the data
from WS1 had been generating a header error.  Investigation found that
the first frame received from WS1 had zeroed the 5th (Spacecraft ID) and
9th (Segment Identifier) bytes of the ACE telemetry frame header.  The
MMOC software was updated to run the WS1 data through the MMOC's
Reed-Solomon decoder before sending it to ASC.  This update resulted in
a new problem with partial/empty files and manual
generation/transmission being necessary.  That problem was fixed after
the WS1 pass on 1/27/2014.  No data was lost or corrupted.  WS1 was
notified of the first frame header problem on 1/7/2014.

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Anomalies:

Update for G13-0011  MMOC Network-Attached Storage.  The backup NAS RAID
(Synology Model DS410) had 2 of 4 hard drives had fail in November 2014.
A third drive Friday 01/31/2014.  Note, since the RAID is a backup, no
data is lost.