ACE Weekly 04/10/2013 - 04/16/2013 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 04/16/2013 DOY 106 2013 Thrusters 2R 4R+ 4R- Duration 9:59 min Start 18:47:52z Stop 18:57:53z HGAStart -8.01deg HGAStop +8.92deg SunStart 11.99deg SunStop 11.04deg SpinStart 5.0864rpm SpinStop 5.0889rpm Nutation 0.12deg Firing 51 pulses FuelUsed 0.1609lbm FuelRemain 114.9204lbm FinalSCMass 1349.180lbm The next attitude maneuver is scheduled for Tuesday 04/23/2013. ======================================================================== OCRs: DOY 102 (04/12/2013) ACE-309 New block bin for medium rate. ACE has 4 block bins loaded on the spacecraft for changing downlink formats. This OCR adds a 5th block bin for switching to medium rate. The block bins are called by time tag bins when automatic downlink format changes are needed. Block Bin 6 Hi-Rate ADC with SSR A Block Bin 7 Hi-Rate ADC with SSR B Block Bin 8 Lo-Rate RTSW Block Bin 9 Lo-Rate ADC Block Bin 11 Med-Rate ADC <- New DOY 105 (04/15/2013) ACE-310 Authorization for Santiago Uplink Test The first test for Santiago ranging (with uplink) was performed on Monday 4/15/2013 (1320-1400z). Some configuration changes were needed and Santiago was able to receive their own ranging tones in the last 7 minutes of the test. The ACE team monitored the spacecraft via the shadow track with WS1 while the spacecraft was in medium rate. There were no problems with the uplink signal and no commands were sent from Santiago. Flight Dynamics analyzed the ranging data and found issues with the UTDF RTLT/range field, the Doppler bias and the Doppler noise. We are waiting to hear from the Near Earth Network as to their plans for future testing. The testing will be used in planning for the DSCOVR mission. Uplink power at spacecraft (antenna angle ~8 degrees) antenna power EIRP power seen by ACE ---------------- ------- -------- ----------------- DSN BWG 34m 2,000W 99 dBW -91 dBm NEN Santiago 9m 10,000W 73 dBW -103 dBm DSN DSS-27 34m 250W 78 dBW -105 dBm NEN WS1 18m 150W 80 dBW -113 dBm ======================================================================== Activities: Data Capture: 100% DOY 097-104 2013 The only impact from the moderate solar storm over the weekend was the ULEIS shutter closing down to 25% for 19 hours. Sat Apr 13 2013, DOY 103 21:55:07z closed to 25% Sun Apr 14 2013, DOY 104 17:02:50z opened to 100% ======================================================================== Anomalies: DOY 101 04/11/2013 S-ACE-0662 G13-0006 ITOS Cleanup Failed ITOS generated an error while disabling commanding after the pass. IMPACT: No impact to the pass. This type of error occasionally has significant impacts on ITOS running future passes. Manual intervention required to clean-up ITOS after the pass.