STEREO Weekly Meeting Minutes for 2018-08-28 (Week 35) 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 34 (Aug 20-26) * On day 233 (Aug 21), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently from 1730z through 1842z. This anomaly resulted in the loss of 19 frames of real-time telemetry and SSR data. * The average daily science data return for Ahead was 6.0 Gbits during this week. Week 35 (Aug 27-Sep 2) * The 112th momentum dump on Ahead is scheduled for Wednesday, Aug 29, with ignition at 14:30 UT. This will be the 31st dump without using the gyros. * Ahead has 12 tracks during the week, and overall coverage is now nominal. There are six tracks at 720 kbps, two at 360 kbps, one at 240 kbps, and three at 160 kbps. * 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. * The DSN network will be down for maintenance between 11-15 UT on Wednesday, Sep 5. This will have no effect on STEREO operations. * Ahead has 13 tracks during the week, and overall coverage is now nominal with the addition of two ESA Malargue passes on Thursday and Friday. There are six tracks at 720 kbps, one at 360 kbps, four at 240 kbps, and two at 160 kbps. * There are no recovery passes for Behind during the week. Week 37 (Sep 10-16) * There are ten tracks for Ahead during the week, and overall coverage is now nominal with the addition of ESA Malargue tracks on Wednesday and Thursday. There are three tracks at 720 kbps, two at 360 kbps, one at 240 kbps, and four at 160 kbps. * There are no recovery passes for Behind during the week. Week 38 (Sep 17-23) * There will be a telemetry assessment review on Wednesday, Sep 19, from 9-12 AM at APL. Webex invitations have been sent out. Please let APL know ahead of time if you plan to attend in person, so that security passes can be obtained. * Ahead has eight passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, two at 240 kbps, and one at 160 kbps. * Recovery passes for Behind using the 1 kHz frequency acquisition sequence are scheduled for Friday, Sep 21 (battery), and on Saturday and Sunday, Sep 22,23 (both carrier). Week 39 (Sep 24-30) * Ahead has nine passes during the week, and overall coverage is now nominal with the addition of an ESA New Norcia pass on Monday, and an ESA Cebreros pass on Thursday. There are six passes at 720 kbps, one pass at 360 kbps, and two passes at 160 kbps. * There are no recovery passes for Behind during the week. Week 40 (Oct 1-7) * Ahead has eleven passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, one at 360 kbps, one at 240 kbps, and three at 160 kbps. This includes an ESA Malargue pass on Tuesday, and an ESA Cebreros pass on Thursday. * There are no recovery passes for Behind during the week. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 27 (239) T Aug 28 (240) W Aug 29 (241) Ahead: Momentum dump, 14:30 UT 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) ------------------------------------------------------------------------------- Scheduled activities for Week 37: M Sep 10 (253) T Sep 11 (254) W Sep 12 (255) T Sep 13 (256) F Sep 14 (257) S Sep 15 (258) S Sep 16 (259) ------------------------------------------------------------------------------- Scheduled activities for Week 38: M Sep 17 (260) T Sep 18 (261) W Sep 19 (262) T Sep 20 (263) F Sep 21 (264) Behind: Recovery track, DSN 14 (1 kHz, battery) S Sep 22 (265) Behind: Recovery track, DSN 14 (1 kHz, carrier) S Sep 23 (266) Behind: Recovery track, DSN 14 (1 kHz, carrier) ------------------------------------------------------------------------------- Scheduled activities for Week 39: M Sep 24 (267) T Sep 25 (268) W Sep 26 (269) T Sep 27 (270) F Sep 28 (271) S Sep 29 (272) S Sep 30 (273) ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Oct 01 (274) T Oct 02 (275) W Oct 03 (276) T Oct 04 (277) F Oct 05 (278) S Oct 06 (279) S Oct 07 (280) ------------------------------------------------------------------------------- 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