ACE Weekly ACE Weekly 10/02/2012 - 10/08/2012

All ACE spacecraft subsystems are performing as expected.

========================================================================
Orbit/Attitude:

	Type        Attitude
	Date        10/08/2012
	DOY         282 2012
	Thrusters   2R 4R+ 4R-
	Duration    16:40 min
	Start       18:18:58z
	Stop        18:35:38z
	HGAStart    -6.80deg
	HGAStop     +9.06deg
	SunStart    15.15deg
	SunStop      5.05deg
	SpinStart   5.0671rpm
	SpinStop    5.0710rpm
	Nutation     0.18deg
	Firing      85 pulses
	FuelUsed      0.2568lbs
	FuelRemain  119.2076lbs
	FinalSCMass 1353.468lbs

The next attitude maneuver is scheduled for Friday 10/19/2012.

This is the second maneuver that used a 9 degree antenna target.  With
the spacecraft antenna angle at 9 degrees and transmitting at the high
data-rate, there is still plenty of link margin with DSS-27, and
sufficient link margin with WS1.  It is expected that DSS-27 could
continue to track ACE slightly beyond 10 degrees (SNR dropping 2-3dB).
But it is expected DSS-27 would have trouble between 10 and 11 degrees
(SNR dropping another ~5dB).  WS1 may not be able to track ACE at 10
degrees.

                   spacecraft      downlink SNR (high-rate)
	date        antenna angle      DSS-27      WS1
	09/06/2012   -4.89 deg        11.9 dB
	09/06/2012   +9.11 deg         7.0 dB
	10/08/2012   -6.80 deg        11.4 dB
	10/08/2012   +9.06 deg         8.0 dB     2.9 dB


========================================================================
OCRs:

None

========================================================================
Activities:

Data Capture:  100%  DOY 274-281 2012

On 10/5/2012 (DOY 279), the second WS1 Engineering Test was performed
with all regular pass activities.  The vc2 connection continued to have
hourly disconnect/reconnects at 38 minutes past the hour.  Goddard Comm
Control has been notified and the problem is being investigated.  We
believe the vc1 data flow problem from the first test was due to the
fact that only one MMOC computer is allowed to forward data to ASC.  ASC
data forwarding was disabled for the second test.  All other activities
were successful.  Another test will be scheduled after the LRO
viewperiod moves later in the day.


========================================================================
Anomalies:

None