ACE Weekly 11/13/2013 - 11/19/2013

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type         Attitude
	Date         11/18/2013
	DOY          322 2013
	Thrusters    2R 4R+ 4R-
	Duration     7:24 min
	Start        17:27:38z
	Stop         17:35:02z
	HGAStart     -8.22 deg
	HGAStop      +9.00 deg
	SunStart     11.25 deg
	SunStop      16.49 deg
	SpinStart    4.9710 rpm
	SpinStop     4.9725 rpm
	Nutation      0.09 deg
	Firing       37 pulses
	FuelUsed       0.1211 lbm
	FuelRemain   110.4136 lbm
	FinalSCMass  1344.674 lbm

The next attitude maneuver is scheduled for Tuesday 11/26/2013.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 314-321 2013

On 11/15/2013, DSN's new Data Capture and Delivery software (DCD v4.1)
was tested with simulated data from DSN's Test Facility (DTF-21).
No problems were found during the 1.5 hour data flow.

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Anomalies:

Update for S13-0001 Tank Temperature & Spin Rate Anomaly

On 9/19/2013 (DOY 262), the B1 Fuel Tank temperature had jumped from
18.4�C to 20.3�C and finally settled between 19.1 and 19.7�C
(temperature resolution 0.63�C).  This also corresponded to a 0.01%
increase in the spacecraft spin.  The current theory is that a warmer
part of the spacecraft came in contact with the B1 Fuel Tank, with the
lower final temperature indicating a loose thermal contact.

During the maneuver on 11/05/2013 (DOY 309), the B1 Fuel Tank
temperature increased again to 20.9�C.  The current theory is that
the warmer part of the spacecraft has made a better thermal contact
with the B1 Fuel Tank resulting in the increased temperature.

These spikes, along with the annual temperature fluctuations, can be
seen in the plot provided by the ACE Science Center.

http://www.srl.caltech.edu/ACE/ASC/DATA/housekeeping/temperatures/gifs/TankB1.jpg

The other tank temperatures are available at

http://www.srl.caltech.edu/ACE/ASC/DATA/housekeeping/temperatures/gifs/TankA1.jpg
http://www.srl.caltech.edu/ACE/ASC/DATA/housekeeping/temperatures/gifs/TankA2.jpg
http://www.srl.caltech.edu/ACE/ASC/DATA/housekeeping/temperatures/gifs/TankB2.jpg

http://www.srl.caltech.edu/ACE/ASC/DATA/housekeeping/temperatures/gifs/