STEREO Weekly Meeting Minutes for 2018-05-29 (Week 22) 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 21 (May 21-27) * On day 144 (May 24), the Ahead spacecraft reached aphelion in its orbit. * The average daily science data return for Ahead was 6.2 Gbits during this week. Week 22 (May 28-Jun 3) * Yesterday, during the station 65 support for Ahead, Turbo lock was lost during part of the pass, and then later in the pass telemetry lock was lost, due to heavy rain at the station. This resulted in 47 minutes of lost data for all instruments. * Ahead has 13 passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, four at 360 kbps, one at 240 kbps, and two at 160 kbps. * There are no recovery passes for Behind scheduled during the week. Week 23 (Jun 4-10) * Ahead has 12 passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, four at 360 kbps, one at 240 kbps, and one at 160 kbps. * There are no recovery passes for Behind scheduled during the week. Week 24 (Jun 11-17) * The JPL network will be down for maintenance on Tuesday, Jun 12, between 11:00-15:00 UTC. There are no tracks during this period. * 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. * 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). COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 28 (148) Memorial Day T May 29 (149) W May 30 (150) T May 31 (151) F Jun 01 (152) S Jun 02 (153) S Jun 03 (154) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 04 (155) T Jun 05 (156) W Jun 06 (157) T Jun 07 (158) F Jun 08 (159) S Jun 09 (160) S Jun 10 (161) ------------------------------------------------------------------------------- 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) ------------------------------------------------------------------------------- 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