ACE Weekly 07/17/2013 - 07/23/2013 All ACE spacecraft subsystems are performing as expected. ======================================================================== 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. ======================================================================== OCRs: None ======================================================================== 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. ======================================================================== 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.