STEREO Weekly Meeting Minutes for 2018-07-24 (Week 30) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally on the main lobe of the high gain antenna. * Behind has transitioned to a monthly schedule to attempt to recover the spacecraft. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 29 (Jul 16-22) * On day 200 (Jul 19), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 1151z and 1314z. This anomaly resulted in the loss of two frames of real-time telemetry and SSR data. * On day 202 (Jul 21), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 1130z. This anomaly resulted in the loss of six frames of real-time telemetry and SSR data. * The average daily science data return for Ahead was 6.7 Gbits during this week. Week 30 (Jul 23-29) * The 111th momentum dump on Ahead is scheduled for Tuesday, Jul 24, with ignition at 20:30 UT. This will be the 30th dump without using the gyros. * Ahead has 12 tracks during the week, and overall coverage is nominal. There are three tracks at 720 kbps, six at 360 kbps, and three at 240 kbps. * There are no recovery passes for Behind during the week. Week 31 (Jul 30-Aug 5) * Ahead has 12 tracks during the week, and overall coverage is nominal. There are six tracks at 720 kbps, four at 360 kbps, and two at 240 kbps. * There are no recovery passes for Behind during the week. Week 32 (Aug 6-12) * Ahead has nine tracks during the week, and overall coverage is nominal. There are three tracks at 720 kbps, three at 360 kbps, two at 240 kbps, and one at 160 kbps. * There are no recovery passes for Behind during the week. Week 33 (Aug 13-19) * The 44th SECCHI stepped calibration roll is scheduled for Tuesday August 14th at 05:55 UT and taking 4.5 hours. This will be the midpoint roll. System momentum will be 1 N-m-s. * The project interface test originally scheduled for Sunday, Aug 19, has been moved to week 34. * Ahead has ten tracks during the week, and overall coverage is nominal. There are five tracks at 720 kbps, two at 360 kbps, two at 240 kbps, and one at 160 kbps. * Recovery tracks for Behind using the double diamond search pattern are scheduled for Monday, Aug 13 (battery), Tuesday, Aug 14 and Wednesday, Aug 15 (both carrier). Week 34 (Aug 20-26) * A project interface test with station 55 is scheduled for Thursday, Aug 19, 15:30-17:45 UT. There will be no SSR commanding or instrument commanding during this pass. * Ahead has 14 tracks during the week, and overall coverage is nominal. There are six tracks at 720 kbps, three at 360 kbps, four at 240 kbps, and one at 160 kbps. * There are no recovery passes for Behind during the week. Week 35 (Aug 27-Sep 2) * Ahead has 11 tracks during the week, and overall coverage is currently short 4.7 hours between Monday and Tuesday. There are five tracks at 720 kbps, one at 360 kbps, two at 240 kbps, and three at 160 kbps. A request for ESA time to relieve the shortage has been submitted. * There are no recovery passes for Behind during the week. Week 36 (Sep 3-9) * Monday, Sep 3, is Labor Day, which is an APL holiday. * Ahead has 11 tracks during the week, and overall coverage is currently short 4 hours between Thursday and Friday. There are six tracks at 720 kbps, two at 360 kbps, and three at 240 kbps. A request for ESA time to relieve the shortage has been submitted. * There are no recovery passes for Behind during the week. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 23 (204) T Jul 24 (205) Ahead: Momentum dump, 20:30 UT W Jul 25 (206) T Jul 26 (207) F Jul 27 (208) S Jul 28 (209) S Jul 29 (210) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 30 (211) T Jul 31 (212) W Aug 01 (213) T Aug 02 (214) F Aug 03 (215) S Aug 04 (216) S Aug 05 (217) ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 06 (218) T Aug 07 (219) W Aug 08 (220) T Aug 09 (221) F Aug 10 (222) S Aug 11 (223) S Aug 12 (224) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 13 (225) Behind: Recovery track, DSN 14 (search, battery) T Aug 14 (226) Ahead: SECCHI stepped calibration roll, 5:55 UT Behind: Recovery track, DSN 14 (search, carrier) W Aug 15 (227) Behind: Recovery track, DSN 14 (search, carrier) T Aug 16 (228) F Aug 17 (229) S Aug 18 (230) S Aug 19 (231) ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 20 (232) T Aug 21 (233) W Aug 22 (234) T Aug 23 (235) Ahead: Project interface test with station 55 F Aug 24 (236) S Aug 25 (237) S Aug 26 (238) ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 27 (239) T Aug 28 (240) W Aug 29 (241) T Aug 30 (242) F Aug 31 (243) S Sep 01 (244) S Sep 02 (245) ------------------------------------------------------------------------------- Scheduled activities for Week 36: M Sep 03 (246) Labor Day T Sep 04 (247) W Sep 05 (248) T Sep 06 (249) F Sep 07 (250) S Sep 08 (251) S Sep 09 (252) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * Mar Ahead: Switch downlink rate to 240 kbps for 34 meter * Apr Behind: Switch downlink rate to 240 kbps for 34 meter 2020: * 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 * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter 2021: * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter 2022: 2023: * May 5 Behind: Mercury transit * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth 2024: 2025: * Apr 7 Ahead: Mercury transit 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit