ACE Weekly 07/17/2013 - 07/23/2013

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type         Attitude
	Date         07/23/2013
	DOY          204 2013
	Thrusters    2R 4R+ 4R-
	Duration     5:35 min
	Start        16:49:29z
	Stop         16:55:04z
	HGAStart     -8.96 deg
	HGAStop      +8.95 deg
	SunStart     11.82 deg
	SunStop      11.04 deg
	SpinStart    4.9447 rpm
	SpinStop     4.9457 rpm
	Nutation      0.19 deg
	Firing       28 pulses
	FuelUsed       0.0945 lbm
	FuelRemain   113.0328 lbm
	FinalSCMass  1347.293 lbm

The next attitude maneuver is scheduled for Tuesday 07/30/2013.

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OCRs:

None

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Activities:

Data Capture:  99.997%  DOY 195-203 2013
	DOY 203 16:17:28-16:17:29  2 seconds lost
	DOY 203 16:27:57-16:28:02  6 seconds covered by ADC
	DOY 203 17:40:18-17:40:21  4 seconds covered by ADC
	DOY 203 17:41:50-17:41:53  4 seconds covered by ADC
Problems with DSN's DCD (Anomaly G13-0008) resulted in the playback
being behind schedule.  When that happens, gaps may not be redumped,
which happened this week.  This marks the end of 190 days of perfect
data capture.
	ADC data includes:    CRIS, EPAM, MAG, SIS, and SWEPAM-I
	but does not include: SWEPAM-E, SWICS, SWIMS and ULEIS


The third Santiago ranging/uplink test was performed Thursday 7/18/2013
(1710-1810z).  No problems were observed from the spacecraft.  Uplink
was established ~1714z.  At ~1725z, Santiago restarted their ranging and
successfully obtained range tones in the downlink.  At 1740z, Santiago
applied command modulation on the uplink (Near Earth Network had
requested command modulation be part of the uplink test).  No commands
were sent to the spacecraft.  FDF's analysis of the test will be
included in next week's report.


Another WS1 pass was successfully taken on 7/22/2013.  Note that the WS1
passes are occurring every 4 weeks with the full moon.  With the full
moon, LRO passes occur during the night, leaving WS1 time for an ACE
pass during the day.


On Monday 7/22/2013 (DOY 203), DSN requested that the ACE MOC disconnect
and reconnect from the SLE telemetry provider.  When the MMOC SLE
software connects to JPL, it cycles through 5 SLE providers (SLE3, SLE4,
SLE1, SLE2, SLETEST) connecting to the first available provider.  On
Monday, the MMOC SLE software had connected to SLE3 and JPL requested a
disconnect/reconnect so that it would be connect to SLE4.

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Anomalies:

DOY 202 07/21/2013  S-ACE-0664  G13-0008  DSN DCD Problems
DSN's Data Capture and Delivery (DCD) experienced a failure for ~2 hours
on Sunday (1848-2024z & 2039-2052z; DR#G114096).  No telemetry was
received in the MMOC during this time.  Telemetry from DCD problems are
usually available via DSN's IDR.  But ACE operations decided to redump
the data on Monday 7/22/2013 (some, but not all data had been captured
by the IDR).  With the playback behind schedule, additional short gaps
during Monday's redump were not redumped (2 seconds lost, 14 seconds
covered by ADC).
IMPACT:  No data to NOAA Space Weather Prediction Center during the 2
hour period on Sunday 7/21/2013.