ACE Weekly 06/05/2013 - 06/11/2013 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 06/11/2013 DOY 162 2013 Thrusters 2R 4R+ 4R- Duration 6:37 min Start 18:54:11z Stop 19:00:48z HGAStart -8.84 deg HGAStop +8.96 deg SunStart 14.38 deg SunStop 18.19 deg SpinStart 4.9489 rpm SpinStop 4.9504 rpm Nutation 0.07 deg Firing 33 pulses FuelUsed 0.1096 lbm FuelRemain 113.6984 lbm FinalSCMass 1347.958 lbm The next attitude maneuver is scheduled for Tuesday 06/18/2013. ======================================================================== OCRs: DOY 162 (06/11/2013) 1836-1846z & 2133-2136z SIS-055 14 cmds The SIS instrument team performed a 2.75 hour test with the >30MeV proton rate replaced with the heavy ion rate in the real-time solar wind data (http://www.swpc.noaa.gov/ace/SIS_7d.html). The heavy ion rate may be useful for some real-time solar wind users (e.g. the MUOS-2 launch scheduled 7/19/2013). During the Tuesday test, the heavy ion rate processed by SWPC (Space Weather Prediction Center) was ~0.115 counts/cm2-s-sr instead of the expected value of ~0.003. The instrument team will analyze the recorded data, which will be dumped on the following pass. It is possible that the algorithm used by SWPC may need to be modified. At the end of the pass, the SIS instrument was returned to the nominal configuration with >30MeV proton rate in RTSW. ======================================================================== Activities: Data Capture: 100% DOY 153-160 2013 Last week's report mentioned that the WS1 ground receipt time was ~0.38 seconds behind DSN. Further investigation found that this had always been the case, but only for low-rate data. Previously, only the ground receipt time for high-rate data had been compared (DSN vs. WS1). The high-rate ground receipt times agreed enough for ACE clock calibration. The ACE clock calibration software can be updated it to handle the extra delay for WS1 at low-rate. Of course, in a typical pass, the spacecraft is at low-rate for only a brief period of time, so there has been negligible impact in previous clock calibrations. It was only during the 5/29/2013 command test when the spacecraft was kept at low-rate for the entire test that the extra delay was noticed. ======================================================================== Anomalies: None