STEREO Weekly Meeting Minutes for 2022-05-10 (Week 19) 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 18 (May 2-8) * On day 124 (May 4), during the DSS-25 support for Ahead, the antenna was declared red, due to an elevation brake failure. This anomaly resulted in the loss of 2.25 hours of real-time telemetry, command, tracking, and SSR data. The MOPs team repositioned the SSR pointers on the subsequent DSS-35 support and recovered all the affected data. See DR #G122731 for more information. * On day 122 (May 2), the 146th momentum dump was executed successfully on Ahead at 1830z, which imparted an estimated delta V of 0.061 m/sec. This was the 65th momentum dump conducted without gyro use. After thruster operations completed, there was a 0.88 degree of roll angle error. Fine pointing stabilized three minutes after completion of the momentum dump. * As of day 128 (May 8), 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 19 (May 9-15) * Ahead has twelve tracks during the week, all at 720 kbps, and overall coverage is nominal. * Last night (May 9), during the station 25 support, telemetry and command bind was lost due to a server OS upgrade at JPL. The station continued to track, and the MOC moved pointers this morning (May 10) to recover a small amount of data. SECCHI commanding was interrupted, and the three remaining commands were sent up this morning. * On Wednesday May 11 PLASTIC will do some real time commanding to load a new sweep table during the DSN-53 track from 17:50-20:50 UT. The MOC will be manned during this period to assist PLASTIC if needed. Peter Schroeder will also be available if needed. There will be a backup command opportunity on Friday May 13 during the DSN-63 track at 16:35 UT. * The asteroid 3200/Phaeton will pass through the SECCHI HI1-A field-of-view between May 15-17. The SECCHI team will observe this event with their normal synoptic program. Week 20 (May 16-22) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. * The 62nd SECCHI stepped calibration roll for the midpoint in the orbit is scheduled for Thursday, May 19, starting at 10:15 UT Week 21 (May 23-29) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. * The Parker Solar Probe perihelion pass runs from days 148-158, May 28-Jun 7. Week 22 (May 30-Jun 5) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. * Monday, May 30, is Memorial Day, which is an APL holiday. Week 23 (Jun 6-12) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. * The 147th momentum dump on ahead is scheduled for Wednesday, Jun 8, with ignition at 20:45 UT. Week 24 (Jun 13-19) * Ahead has eleven tracks during the week, all at 720 kbps, and overall coverage is nominal. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 19: M May 09 (129) T May 10 (130) W May 11 (131) T May 12 (132) F May 13 (133) S May 14 (134) S May 15 (135) Notes: * 3200/Phaethon in HI1-A field-of-view, May 15-17 ------------------------------------------------------------------------------- Scheduled activities for Week 20: M May 16 (136) T May 17 (137) W May 18 (138) T May 19 (139) Ahead: Stepped calibration roll, 10:15 UT F May 20 (140) S May 21 (141) S May 22 (142) Notes: * 3200/Phaethon in HI1-A field-of-view, May 15-17 ------------------------------------------------------------------------------- Scheduled activities for Week 21: M May 23 (143) T May 24 (144) W May 25 (145) T May 26 (146) F May 27 (147) S May 28 (148) Start of Parker Solar Probe perihelion pass S May 29 (149) Notes: * Parker Solar Probe perihelion pass, May 28-Jun 7. ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 30 (150) Memorial Day T May 31 (151) W Jun 01 (152) T Jun 02 (153) F Jun 03 (154) S Jun 04 (155) S Jun 05 (156) Notes: * Parker Solar Probe perihelion pass, May 28-Jun 7. ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 06 (157) T Jun 07 (158) End of Parker Solar Probe perihelion pass W Jun 08 (159) Ahead: Momentum dump, 20:45 UT T Jun 09 (160) F Jun 10 (161) S Jun 11 (162) S Jun 12 (163) Notes: * Parker Solar Probe perihelion pass, May 28-Jun 7. ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 13 (164) T Jun 14 (165) W Jun 15 (166) T Jun 16 (167) F Jun 17 (168) S Jun 18 (169) S Jun 19 (170) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2022: * Sep 2-11 Parker Solar Probe perihelion pass * Sep 4 Solar Orbiter Venus flyby * 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