STEREO Weekly Meeting Minutes for 2022-08-30 (Week 35) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is in operational mode, but with a moderately higher than normal background rate. * 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 34 (Aug 22-28) * On day 237 (Aug 25), during the DSS-55 support for Ahead, the antenna was stowed inadvertently at 1818z. The antenna was returned to point at 1825z. This anomaly resulted in the loss of seven minutes of real-time telemetry, command, 2-way tracking, and SSR data. The MOPs team repositioned the SSR pointers and recovered all the affected data. See DR #G122997 for more information. * On day 237 (Aug 25), the IMPACT GSE located in the MOC could not connect to the command system, due to network configuration issues and an outdated SSH client. The maintenance team corrected the problems, so IMPACT will try commanding again next week. * On day 239 (Aug 27), during the DSS-25 support for Ahead, turbo decoder lock was lost briefly at 0144z. This anomaly resulted in the loss of 34 frames of SSR data. * On day 234 (Aug 22), the MOPs team successfully conducted the 12th battery discharge event on Ahead at 1800z to redistribute the electrolytes within the nickel hydrogen battery cells. * On day 235 (Aug 23), the 63rd SECCHI stepped calibration was executed at 0220z for perihelion in the Ahead orbit. This was the 32nd SECCHI stepped calibration roll conducted without gyro use. * On day 236 (Aug 24), the 149th momentum dump on Ahead was executed successfully at 2000z, which imparted an estimated delta V of 0.057 m/sec. This was the 68th momentum dump conducted without gyro use. After thruster operations completed, there was a 1.1 degree of roll angle error. Fine pointing stabilized 3.3 minutes after completion of the momentum dump. * As of day 240 (Aug 28), all PLASTIC systems on Ahead are behaving well, except there is a moderate background count rate, which the team is continuing to monitor. * The average daily science data return for Ahead was 6.7 Gbits during this week. Week 35 (Aug 29-Sep 4) * Ahead has twelve tracks during the week, all at 720 kbps, and overall coverage is nominal. ESA Malague tracks have been added on Tuesday, Aug 30, Thursday, Sep 1, and Friday, Sep 2. The total number of tracks has been increased from 9 to 12 to clear up a shortage toward the end of the week. * The Artemis I launch scheduled for Aug 29 was scrubbed. Launch contingency plans have not been activated yet. * The IMPACT/HET team will try again to do their real-time commanding tomorrow, Aug 31. They also have a backup plan to command through Berkeley, if necessary. * Parker Solar Probe will have a perihelion pass between Sep 2-11. * Solar Orbiter will fly by Venus on Sunday, Sep 4. Week 36 (Sep 5-11) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. ESA Malague tracks have been added on Tuesday, Sep 6, and Wednesday, Sep 7, and ESA Cebreros tracks have been added on Wednesday, Sep 7, and Saturday, Sep 10. * Monday, Sep 5, is Labor Day, which is an APL holiday. Week 37 (Sep 12-18) * Ahead has ten tracks during the week, all at 720 kbps, and overall coverage is nominal. One track was removed due to Artemis contingency planning. Week 38 (Sep 19-25) * Ahead has ten tracks during the week, all at 720 kbps, and overall coverage is nominal. ESA Cebreros and Malague tracks were added on Thursday, Sep 22, for Artemis launch contingency, replacing two DSN tracks. Week 39 (Sep 26-Oct 2) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. * The 150th momentum dump on Ahead is scheduled for Tuesday, Sep 27, with ignition at 18:30 UT. Week 40 (Oct 3-9) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 22 (234) Ahead: Battery discharge cycle, 18:00 UT T Aug 23 (235) Ahead: SECCHI stepped calibration roll, 02:20 UT Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT W Aug 24 (236) Ahead: Momentum dump, 20:00 UT T Aug 25 (237) F Aug 26 (238) S Aug 27 (239) S Aug 28 (240) Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 29 (241) T Aug 30 (242) Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT W Aug 31 (243) T Sep 01 (244) F Sep 02 (245) S Sep 03 (246) Ahead: SECCHI EUVI 171A Deep Field + COR2 Deep Field S Sep 04 (247) Ahead: SECCHI EUVI 171A Deep Field + COR2 Deep Field Solar Orbiter Venus flyby Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. * Parker Solar Probe perihelion pass, Sep 2-11. ------------------------------------------------------------------------------- Scheduled activities for Week 36: M Sep 05 (248) Ahead: SECCHI EUVI 171A Deep Field + COR2 Deep Field Labor Day T Sep 06 (249) Ahead: SECCHI COR2 pB campaign + COR2 Deep Field W Sep 07 (250) Ahead: SECCHI COR2 pB campaign + COR2 Deep Field T Sep 08 (251) Ahead: SECCHI COR2 pB campaign + COR2 Deep Field F Sep 09 (252) Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT S Sep 10 (253) S Sep 11 (254) Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. * Parker Solar Probe perihelion pass, Sep 2-11. ------------------------------------------------------------------------------- Scheduled activities for Week 37: M Sep 12 (255) T Sep 13 (256) Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT W Sep 14 (257) T Sep 15 (258) F Sep 16 (259) S Sep 17 (260) S Sep 18 (261) Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. ------------------------------------------------------------------------------- Scheduled activities for Week 38: M Sep 19 (262) T Sep 20 (263) Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT W Sep 21 (264) T Sep 22 (265) F Sep 23 (266) S Sep 24 (267) S Sep 25 (268) Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. ------------------------------------------------------------------------------- Scheduled activities for Week 39: M Sep 26 (269) T Sep 27 (270) Ahead: Momentum dump, 18:30 UT Ahead: SECCHI HI-2 Betelgeuse observations, 20-22 UT (TBC) W Sep 28 (271) T Sep 29 (272) F Sep 30 (273) S Oct 01 (274) S Oct 02 (275) Notes: * Betelgeuse in HI-2 field-of-view, Aug 9-Sep 29. ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Oct 03 (276) T Oct 04 (277) W Oct 05 (278) T Oct 06 (279) F Oct 07 (280) S Oct 08 (281) S Oct 09 (282) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2022: * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Jan 3 Solar Orbiter Mercury transit * Mar 13-23 Parker Solar Probe perihelion pass * Apr 16 Solar Orbiter Venus occultation * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * Jun 27 Solar Orbiter Mercury transit * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth * Aug 21 Parker Solar Probe Venus flyby * 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 * Nov 6 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Dec 20-29 Parker Solar Probe perihelion pass 2025: * Feb 18 Solar Orbiter Venus flyby * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: * Dec 24 Solar Orbiter Venus flyby 2027: * Feb 1 Behind: Mercury transit 2028: * Mar 18 Solar Orbiter Venus flyby 2029: * Jun 10 Solar Orbiter Venus flyby * Jun 30 Ahead: Mercury transit 2030: * Sep 3 Solar Orbiter Venus flyby