ACE Weekly 09/24/2014 - 09/30/2014

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

Type         	 	Attitude
Date         		09/30/2014
DOY           		273 2014
Thrusters     		2R 4R+ 4R-
Duration      		10:52 min
Start         		15:15:15z
Stop          		15:26:07z
ra,decStart  		176.28,-14.27
ra,decStop   		185.99,-18.28
ra,decExpect 		186.46,-18.45
Deviation      	   	   0.48 deg (-4% short)
HGAStart      	  	  -9.76 deg
HGAStop      		+10.73 deg
SunStart      		  15.37 deg
SunStop       		  15.49 deg
SpinStart    		4.9896 rpm
SpinStop     		4.9925 rpm
Nutation       		    0.22 deg
Firing        		   55 pulses
FuelUsed       		    0.1715 lbm
FuelRemain   		103.7484 lbm
FinalSCMass  		1338.008 lbm

The next attitude maneuver is scheduled for Tuesday 10/07/2014.

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OCRs: 

None

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Activities:

Data Capture:  99.98%  DOY 264-271 2014
  DOY 269  04:52:57-04:54:10	74 seconds
  DOY 271  07:47:53-07:48:59	67 seconds
  DOY 271  09:54:49-09:55:19	31 seconds

There were 172 seconds of data loss due to SSR B being stuck in playback, a SSR failover and no redumps performed when we are behind in the SSR playback.

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Anomalies:

DOY 269  09/26/2014  S-ACE-0689  ACE_PASS procedure stuck waiting for command verification
Nominal end of pass activities were not completed during the support due to an ITOS command graph error which interrupted procedure execution.    When the SSR playback is longer than the pass, the SSR is commanded to idle before switching to the low-rate (RTSW) data format.  SSR B was still in playback when the downlink format automatically changed to RTSW @ EOT.
IMPACT:  The ground procedures are designed to handle this contingency.  However, 172 seconds of data was lost because SSR stuck in playback, SSR failover occurred and redumps are not performed when the playback is behind.   

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Jacqueline Maldonado Snell
WIND, Geotail and ACE Flight Operations Team Manager
Honeywell Technology Solutions Incorporated (HTSI)
Goddard Space Flight Center
Bldg. 14 Rm N284, Mailstop 428.2
Greenbelt, MD 20771
Office: 301-286-7072
Cell:      443-896-8868
Fax:      301-286-8257
Email:  Jacqueline.M.Snell@nasa.gov