ACE Weekly 01/29/2014 - 02/04/2014 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 02/04/2014 DOY 035 2014 Thrusters 2R 4R+ 4R- Duration 9:43 min Start 16:00:02z Stop 16:09:45z HGAStart -8.17 deg HGAStop -5.05 deg SunStart 14.98 deg SunStop 9.92 deg SpinStart 4.9751 rpm SpinStop 4.9769 rpm Nutation 0.12 deg Firing 49 pulses FuelUsed 0.1560 lbm FuelRemain 109.0552 lbm FinalSCMass 1343.315 lbm The next attitude maneuver is scheduled for Tuesday 02/11/2014. ======================================================================== OCRs: DOY 035 (02/04/2014) 1534z SIS-062 1 cmd On 1/27/2014 (OCR SIS-061), the instrument team tested a scenario for increasing the number detector strips with larger thresholds. From the instrument team: The test did not produce desired results. We will further analyze both the data and flight software in order to find out why the test didn't work, but in the meantime we need to restore the instrument state. ======================================================================== Activities: Data Capture: 100% DOY 026-033 2014 Antenna time is less of a problem now, compared to the beginning of January. During the winter months, the northern hemisphere antennas (9 out of 12 DSN antennas) have less view on ACE and other sunward missions. Also there had been a series of DSN problems that have improved. The new moon (Thursday 1/30/2014) is usually a problem, but LADEE has been reducing their coverage to ~90 hours per week. A WS1 pass was taken on 1/27/2014 to get an additional 2 hours of antenna time. The Near Earth Network continues to perform range tests in order to analyze the range bias with the Flight Dynamics Facility. 01/29/2014 1705-1825z 9m Santiago 01/31/2014 1500-1900z 9m Santiago 02/01/2014 1425-1615z WS1 02/02/2014 1435-1515z WS1 02/03/2014 1615-1745z 9m Santiago FDF reported that the regular (non-testing) WS1 pass on 1/27/2014 had a larger range bias than normal. On 12/16/2013, ACE Science Center (ASC) notified the FOT that the data from WS1 had been generating a header error. Investigation found that the first frame received from WS1 had zeroed the 5th (Spacecraft ID) and 9th (Segment Identifier) bytes of the ACE telemetry frame header. The MMOC software was updated to run the WS1 data through the MMOC's Reed-Solomon decoder before sending it to ASC. This update resulted in a new problem with partial/empty files and manual generation/transmission being necessary. That problem was fixed after the WS1 pass on 1/27/2014. No data was lost or corrupted. WS1 was notified of the first frame header problem on 1/7/2014. ======================================================================== Anomalies: Update for G13-0011 MMOC Network-Attached Storage. The backup NAS RAID (Synology Model DS410) had 2 of 4 hard drives had fail in November 2014. A third drive Friday 01/31/2014. Note, since the RAID is a backup, no data is lost.