STEREO Weekly Meeting Minutes for 2020-07-14 (Week 29) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is back to operational mode, but with a higher 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 28 (Jul 6-12) * On day 193 (Jul 11), during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 0526z. This anomaly resulted in the loss of three frames of SSR data. * On day 194 (Jul 12), during the DSS-14 support for Ahead, the transmitter was declared red due to the dichroic mirror being stuck in the extended position. This anomaly resulted in the loss of 2.8 hours of real-time commanding and 2-way tracking data. See DR #G121213 for more information. * As of day 194 (Jul 12), all PLASTIC Ahead systems are behaving well, except there is a high background count rate, which the team is continuing to monitor. * The average daily science data return for Ahead was 6.8 Gbits during this week. Week 29 (Jul 13-19) * Ahead has nine passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, one at 480 kbps, and two at 360 kbps. * The second 180 degree roll to observe Betelgeuse was carried out yesterday (Jul 13), between 20-22 UT. * The 54th SECCHI stepped calibration roll is scheduled for Wednesday, Jul 15, starting at 16:35 UT. This is the midpoint roll. Week 30 (Jul 20-26) * Ahead has twelve passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, two at 480 kbps, and three at 360 kbps. * An ESA New Norcia pass is scheduled for Thursday, Jul 23, 06:00-8:30 UT. * The third 180 degree roll to observe Betelgeuse is scheduled for Monday, Jul.20, between 12-14 UT. Week 31 (Jul 27-Aug 2) * Ahead has eleven passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, and five at 480 kbps. * The fourth and final 180 degree roll to observe Betelgeuse is scheduled for Monday, Jul 27, between 8-10 UT. Week 32 (Aug 3-9) * Ahead has fifteen passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, two at 480 kbps, and five at 360 kbps. * An ESA New Norcia pass is scheduled for Thursday, Aug 6, 08:30-12:30. * A test of the three links per operator link test is scheduled for Friday, Aug 7, using station 14. There will be no instrument commanding or SSR downlink during this pass. Week 33 (Aug 10-16) * Ahead has thirteen passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, one at 480 kbps, and two at 360 kbps. * The 130th momentum dump on Ahead is scheduled for Tuesday, Aug 11, with ignition at 21:00 UT. Week 34 (Aug 17-23) * Ahead has eleven passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, three at 480 kbps, and three at 360 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 13 (195) Ahead: 180 degree roll for observation of Betelgeuse, 20-22 UT T Jul 14 (196) W Jul 15 (197) Ahead: SECCHI stepped calibration roll, 16:35 UT T Jul 16 (198) F Jul 17 (199) S Jul 18 (200) S Jul 19 (201) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 20 (202) Ahead: 180 degree roll for observation of Betelgeuse, 12-14 UT T Jul 21 (203) W Jul 22 (204) T Jul 23 (205) F Jul 24 (206) S Jul 25 (207) S Jul 26 (208) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 27 (209) Ahead: 180 degree roll for observation of Betelgeuse, 8-10 UT T Jul 28 (210) W Jul 29 (211) T Jul 30 (212) F Jul 31 (213) S Aug 01 (214) S Aug 02 (215) ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 03 (216) T Aug 04 (217) W Aug 05 (218) T Aug 06 (219) F Aug 07 (220) Ahead: 3 links/operator link test with station 14 S Aug 08 (221) S Aug 09 (222) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 10 (223) T Aug 11 (224) Ahead: Momentum dump, 21:00 UT W Aug 12 (225) T Aug 13 (226) F Aug 14 (227) S Aug 15 (228) S Aug 16 (229) ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 17 (230) T Aug 18 (231) W Aug 19 (232) T Aug 20 (233) F Aug 21 (234) S Aug 22 (235) S Aug 23 (236) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2020: * Sep 22-Oct 2 Parker Solar Probe perihelion pass 2021: * Jan 13-23 Parker Solar Probe perihelion pass * Feb 20 Parker Solar Probe Venus flyby * Apr 25-May 4 Parker Solar Probe perihelion pass * Aug 5-15 Parker Solar Probe perihelion pass * Oct 16 Parker Solar Probe Venus flyby * Nov 17-26 Parker Solar Probe perihelion pass 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Mar 13-23 Parker Solar Probe perihelion pass * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * 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: * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit