STEREO Weekly Meeting Minutes for 2018-06-12 (Week 24) 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 23 (Jun 4-10) * On day 157 (Jun 6), during the DSS-35 support for Ahead, turbo decoder lock was lost intermittently from 0435z through 0438z. This anomaly resulted in the loss of 500 frames of real-time telemetry and SSR data, which is equivalent to a few seconds of data. See DR #C113504 for more information. * On day 158 (Jun 7), during the DSS-14 support for Ahead, initial telemetry lock was 1.2 hours late occurring at 1707z due to a mechanical anomaly at the station. SSR pointers were repositioned during the track to minimize data loss. This anomaly resulted in the loss of 6.7 hours of SECCHI SSR data. See DR #G119160 for more information. * On day 159 (Jun 8), the SECCHI SSR science partition (#19) on Ahead reached 100% full at 0950z for 6.7 hours due to the DSS-14 anomaly on day 158. * The average daily science data return for Ahead was 5.9 Gbits during this week. Week 24 (Jun 11-17) * The JPL network was scheduled to be down for maintenance earlier this morning (Jun 12). It is believed that this maintenance is now complete. * Sunday, Jun 17, marks the date when the Behind spacecraft should resume the capability of 633 bps on the LGA when 3-axis stabilized, with a 2 dB margin using a 70 meter dish. * Ahead has ten tracks during the week, and overall coverage is nominal. There are five tracks at 720 kbps, three at 360 kbps, and two at 240 kbps. * Search pattern tracks to attempt to recover Behind are scheduled for Tuesday, Jun 12 (battery), and on Thursday, Jun 14, and Friday, Jun 15 (both carrier). Week 25 (Jun 18-24) * The 110th momentum dump on Ahead is scheduled for Thursday, Jun 21, with ignition at 20:00 UT. This will be the 29th dump without using the gyros. * Ahead has 11 tracks during the week, and overall coverage is nominal. There are six tracks at 720 kbps, three at 360 kbps, and two at 240 kbps. * There are no recovery passes for Behind during the week. Week 26 (Jun 25-Jul 1) * Ahead has eleven tracks during the week, and overall coverage is now nominal after a 70 meter pass was added on Monday. There are seven tracks at 720 kbps, and four at 240 kbps. * There are no recovery passes for Behind during the week. Week 27 (Jul 2-8) * Wednesday, Jul 4, is Independence Day, which is a holiday at APL. * Ahead has ten tracks during the week, and overall coverage is nominal. There are five tracks at 720 kbps, three at 360 kbps, and two at 240 kbsp. * There are no recovery passes for Behind during the week. Week 28 (Jul 8-15) * Ahead has twelve tracks during the week, and overall coverage is nominal. There are three tracks at 720 kbps, three at 360 kbps, and six at 240 kbps. * Recovery tracks for Behind using the 1 kHz frequency acquisition sequence are scheduled for Monday, Jul 9 (battery), and Tuesday, Jul 10 and Wednesday, Jul 11 (both carrier). Week 29 (Jun 16-22) * Ahead has 16 tracks during the week, and overall coverage is nominal. There are four tracks at 720 kbps, three at 360 kbps, and nine at 240 kbps. * There are no recovery passes for Behind during the week. Week 30 (Jun 23-29) * Ahead has 11 tracks during the week, and overall coverage is nominal. There are two tracks at 720 kbps, four at 360 kbps, and 5 at 240 kbps. * There are no recovery passes for Behind during the week. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 11 (162) T Jun 12 (163) Behind: Recovery track, DSN 14 (search, battery) W Jun 13 (164) T Jun 14 (165) Behind: Recovery track, DSN 14 (search, carrier) F Jun 15 (166) Behind: Recovery track, DSN 14 (search, carrier) S Jun 16 (167) S Jun 17 (168) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 18 (169) T Jun 19 (170) W Jun 20 (171) T Jun 21 (172) Ahead: Momentum dump, 20:00 UT F Jun 22 (173) S Jun 23 (174) S Jun 24 (175) ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 25 (176) T Jun 26 (177) W Jun 27 (178) T Jun 28 (179) F Jun 29 (180) S Jun 30 (181) S Jul 01 (182) ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 02 (183) T Jul 03 (184) W Jul 04 (185) Independence Day T Jul 05 (186) F Jul 06 (187) S Jul 07 (188) S Jul 08 (189) ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 09 (190) Behind: Recovery track, DSN 14 (1 kHz, battery) T Jul 10 (191) Behind: Recovery track, DSN 43 (1 kHz, carrier) W Jul 11 (192) Behind: Recovery track, DSN 43 (1 kHz, carrier) T Jul 12 (193) F Jul 13 (194) S Jul 14 (195) S Jul 15 (196) ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 16 (197) T Jul 17 (198) W Jul 18 (199) T Jul 19 (200) F Jul 20 (201) S Jul 21 (202) S Jul 22 (203) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 23 (204) T Jul 24 (205) W Jul 25 (206) T Jul 26 (207) F Jul 27 (208) S Jul 28 (209) S Jul 29 (210) ------------------------------------------------------------------------------- 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