STEREO Weekly Meeting Minutes for 2018-10-30 (Week 44) ANNOUNCEMENTS ------------- * Four years after the initial loss of communications anomaly with Behind observatory, NASA has directed to cease periodic recovery operations with the last support on October 17, 2018. Additional information can be found at: https://stereo-ssc.nascom.nasa.gov/behind_status.shtml INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally on the main lobe of the high gain antenna. Recovery continues for the IMPACT and PLASTIC instruments due to the power consumption anomaly on Sep 23. * Four years after the initial loss of communications anomaly with the Behind observatory, NASA has directed to cease periodic recovery operations with the last support on October 17, 2018. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 43 (Oct 22-28) * On day 296 (Oct 23), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 1139z. This anomaly resulted in the loss of 252 frames of real-time telemetry and SSR data. See DR# M110939 for more information. * Day 298 (Oct 25) marked the 12th year anniversary of the STEREO launch. * On day 298 (Oct 25), during the DSS-43 support for Ahead, monitor data was lost beginning at 0109z through 0120z. This anomaly resulted in the loss of 11 minutes of monitor data. All SSR data were received. See DR# N110995 for more information. * On day 298 (Oct 25), the DSS-65 support was cancelled as the DSCOVR mission declared a spacecraft emergency. See DR# M110926 for more information. The ESA Malargue (DSS-84) station was available later in the day at 2220z for 1.4 hours. During the DSS-84, a blind acquisition was conducted, SSR pointers were moved, and the downlink was returned to the space weather broadcast. All commanding was conducted in the blind, and received successfully, as no real-time telemetry was available due to a station issue. These anomalies resulted in the loss of 0.9 hours of commanding and 2.3 hours of real-time telemetry and twoway tracking data. All SSR data were received on a subsequent DSN support. * On day 298 (Oct 25), the second acceptance test of the CCSDS SLE bluebook version 4 software update between the Ahead MOC with DTF-21 was conducted. While SLE binds were unsuccessful due to a MOC software issue, acceptance test procedures were tested using SLE version 1. Further testing will be scheduled. * The average daily science data return for Ahead was 4.6 Gbits during this week. Week 44 (Oct 29-Nov 4) * The IMPACT SEP team performed commanding last week and yesterday (Oct 29) to look into why the SIT data were not as expected. * The 45th SECCHI stepped calibration roll was successfully carried out this morning, Oct 30, starting at 6:10 UT. * SECCHI will be taking deep exposures with COR2 to support the first perihelion pass of Parker Solar Probe, from Saturday, Nov 3 to Tuesday, Nov 6. * Daylight savings time in the US ends on Sunday, Nov 4. * Ahead has nine passes during the week, and overall coverage is nominal. There are four passes at 720 kbps, three at 360 kbps, and two at 160 kbps, including an ESA Cebreros pass on Monday. Week 45 (Nov 5-Nov 11) * SECCHI COR2 deep exposures in support of the first perihelion pass of Parker Solar Probe continues through Tuesday, Nov 6. * Ahead has thirteen passes during the week and overall coverage is nominal. There are three passes at 720 kbps, two at 360 kbps, two at 240 kpbs and six at 160 kbps, including ESA supports with New Norcia (Tuesday and Friday), and Cebreros (Friday). Week 46 (Nov 12-18) * Ahead reaches perihelion on Nov 12. * The 114th momentum dump is scheduled for Monday, Nov 12, with ignition at 14:30 UT. This will be the 33rd dump without using the gyros. The dump was moved from the original date of Nov 7 at the request of the SECCHI team to avoid conflicts with the first Parker Solar Probe perihelion pass. The momentum dump will be conducted during an ESA Cebreros pass. * Ahead has eleven passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, three at 360 kbps, and three at 160 kbps, including ESA Cebreros passes on Monday and Tuesday. Week 47 (Nov 19-25) * Thursday, Nov 22, is Thanksgiving. Both Thursday and Friday are holidays at APL. * Ahead has eleven passes during the week, and overall coverage is nominal. There are four passes at 720 kbps, one at 360 kbps, three at 240 kbps, and three at 160 kbps, including ESA Cebreros passes on Wednesday and Friday. Week 48 (Nov 26-Dec 2) * Chanukah starts on Dec 2, and runs though Dec 10. * Ahead has nine passes during the week, and overall coverage is nominal. There are four passes at 720 kbps, four at 360 kbps, and one at 160 kbps. Week 49 (Dec 3-9) * Ahead has nine passes during the week, and overall coverage is nominal. There are four passes at 720 kbps, three at 360 kbps, and two at 240 kbps. Week 50 (Dec 10-16) * Ahead has ten passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, one at 360 kbps, two at 240 kbps, and one at 160 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 29 (302) T Oct 30 (303) Ahead: SECCHI stepped calibration roll, 6:10 UT W Oct 31 (304) T Nov 01 (305) F Nov 02 (306) S Nov 03 (307) SECCHI COR2 deep exposure campaign for Parker Solar Probe S Nov 04 (308) SECCHI COR2 deep exposure campaign for Parker Solar Probe Daylight savings time ends in the US ------------------------------------------------------------------------------- Scheduled activities for Week 45: M Nov 05 (309) SECCHI COR2 deep exposure campaign for Parker Solar Probe T Nov 06 (310) SECCHI COR2 deep exposure campaign for Parker Solar Probe W Nov 07 (311) T Nov 08 (312) F Nov 09 (313) S Nov 10 (314) S Nov 11 (315) ------------------------------------------------------------------------------- Scheduled activities for Week 46: M Nov 12 (316) Ahead: Perihelion Ahead: Momentum dump, 14:30 UT T Nov 13 (317) W Nov 14 (318) T Nov 15 (319) F Nov 16 (320) S Nov 17 (321) S Nov 18 (322) ------------------------------------------------------------------------------- Scheduled activities for Week 47: M Nov 19 (323) T Nov 20 (324) W Nov 21 (325) T Nov 22 (326) Thanksgiving F Nov 23 (327) S Nov 24 (328) S Nov 25 (329) ------------------------------------------------------------------------------- Scheduled activities for Week 48: M Nov 26 (330) T Nov 27 (331) W Nov 28 (332) T Nov 29 (333) F Nov 30 (334) S Dec 01 (335) S Dec 02 (336) ------------------------------------------------------------------------------- Scheduled activities for Week 49: M Dec 03 (337) T Dec 04 (338) W Dec 05 (339) T Dec 06 (340) F Dec 07 (341) S Dec 08 (342) S Dec 09 (343) ------------------------------------------------------------------------------- Scheduled activities for Week 50: M Dec 10 (344) T Dec 11 (345) W Dec 12 (346) T Dec 13 (347) F Dec 14 (348) S Dec 15 (349) S Dec 16 (350) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * Mar Ahead: Switch downlink rate to 240 kbps for 34 meter * Mar 31-Apr 10 Parker Solar Probe perihelion pass * Apr Behind: Switch downlink rate to 240 kbps for 34 meter * Aug 28-Sep 7 Parker Solar Probe perihelion pass * Nov 4 Ahead: Close approach of Parker Solar Probe 2020: * Jan 24-Feb 4 Parker Solar Probe perihelion pass * May Behind: Switch downlink rate to 360 kbps for 34 meter * Jun Ahead: Switch downlink rate to 360 kbps for 34 meter * Jun Behind: Switch downlink rate to 480 kbps for 34 meter * Jun 2-13 Parker Solar Probe perihelion pass * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter * Sep 22-Oct 2 Parker Solar Probe perihelion pass 2021: * Jan 13-23 Parker Solar Probe perihelion pass * Apr 25-May 4 Parker Solar Probe perihelion pass * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter * Aug 5-15 Parker Solar Probe perihelion pass * Nov 17-26 Parker Solar Probe perihelion pass 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Mar 13-23 Parker Solar Probe perihelion pass * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth * Sep 23-Oct 3 Parker Solar Probe perihelion pass * Dec 25-Jan 3 Parker Solar Probe perihelion pass 2024: * Mar 26-Apr 4 Parker Solar Probe perihelion pass * Jun 26-Jul 5 Parker Solar Probe perihelion pass * Sep 26-Oct 5 Parker Solar Probe perihelion pass * Dec 20-29 Parker Solar Probe perihelion pass 2025: * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit