STEREO Weekly Meeting Minutes for 2023-07-25 (Week 30) 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 29 (Jul 17-23) * On day 198 (Jul 17), the 158th momentum dump was executed successfully at 1930z, which imparted an estimated delta V of 0.092 m/sec. This was the 77th momentum dump conducted without gyro use. After thruster operations completed, there was a 1.1 degree of roll angle error. Fine pointing stabilized 2.6 minutes after completion of the momentum dump. * On day 204 (Jul 23), the third week of the SECCHI high downlink campaign (HDC) was completed for STEREO-A closest approach to Earth (occurs on Aug 17, 2023). During the HDC, SECCHI will be repeating data collections from 2007 and 2008 for high cadence EUVI, COR1/2, and HI1/2 images. Extra DSN track coverage has been planned for the HDC (Jul 3 - Aug 2, 2023) to increase the daily science data return to 10-11 Gbits per day (normally 5-6 Gbits). * As of day 204 (Jul 23), all PLASTIC systems 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 9.2 Gbits during this week. Week 30 (Jul 24-30) * Ahead has fifteen passes during the week, all at 720 kbps, and overall coverage is nominal. * Additional tracks for SECCHI high downlink campaign (Weeks 27-31). * Yesterday, Jul 24, station 63 antenna was declared red just before the pass. Pointers were moved, but about 2 hours of SECCHI telemetry were lost, between around 4:42-6:39 UT. Week 31 (Jul 31-Aug 6) * Ahead has thirteen passes during the week, all at 720 kbps, and overall coverage is nominal. * Last week of SECCHI high downlink campaign, ends on Wednesday, Aug 2. * An ESA Malargüe track is scheduled for Monday, Jul 31. * The 14th battery discharge event is scheduled for Thursday, Aug 3, starting at 15:00 UT. Week 32 (Aug 7 - Aug 13) * Ahead has eleven passes during the week, all at 720 kbps, and overall coverage is nominal. * Aug 7 will begin slow roll to prepare for closest approach to Earth on Aug 17. The roll will be from Aug 7-21. * Wednesday Aug 9, DSN mission network maintenance 06:30-10:30 UT. We don't have a track during that time, but do have one after that. Week 33 (Aug 14 - Aug 20) * Ahead has ten passes during the week, all at 720 kbps, and overall coverage is nominal. * Aug 17 STEREO-A closest approach to Earth Week 34 (Aug 21-27) * Ahead has ten passes during the week, all at 720 kbps, and overall coverage is nominal. * STEREO Ahead's slow roll ends on Aug 21. * Parker Solar Probe will fly by Venus to adjust its orbit on Aug 21. Week 35 (Aug 28-Sep 3) * Ahead has nine passes during the week, all at 720 kbps, and overall coverage is nominal. * The 159th momentum dump on Ahead is scheduled for Tuesday, Aug 29, with ignition at 14:30 UT. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 24 (205) T Jul 25 (206) W Jul 26 (207) T Jul 27 (208) F Jul 28 (209) S Jul 29 (210) S Jul 30 (211) Notes: * SECCHI high downlink campaign Jul 3-Aug 2 - Science goals: Coronal outflows, AR at/close to limb, Jul 17-Aug 2 - EUVI (195 @ 2.5-min; 304 @ 10-min; 171/284 @ 2-hr full disk) - COR2 (tB @ 2.5-min w/ 18-sec exp) - HI1 @ 20-min, HI2 @ 2-hr ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 31 (212) T Aug 01 (213) W Aug 02 (214) End of SECCHI high downlink campaign T Aug 03 (215) Ahead: battery discharge maintenance event, 15:00 UT F Aug 04 (216) S Aug 05 (217) S Aug 06 (218) Notes: * SECCHI high downlink campaign Jul 3-Aug 2 - Science goals: Coronal outflows, AR at/close to limb, Jul 17-Aug 2 - EUVI (195 @ 2.5-min; 304 @ 10-min; 171/284 @ 2-hr full disk) - COR2 (tB @ 2.5-min w/ 18-sec exp) - HI1 @ 20-min, HI2 @ 2-hr ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 07 (219) T Aug 08 (220) W Aug 09 (221) T Aug 10 (222) F Aug 11 (223) S Aug 12 (224) S Aug 13 (225) ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 14 (226) T Aug 15 (227) W Aug 16 (228) T Aug 17 (229) Ahead: Closest approach to Earth F Aug 18 (230) S Aug 19 (231) S Aug 20 (232) ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 21 (233) Parker Solar Probe Venus flyby T Aug 22 (234) W Aug 23 (235) T Aug 24 (236) F Aug 25 (237) S Aug 26 (238) S Aug 27 (239) ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 28 (240) T Aug 29 (241) Ahead: Momentum dump W Aug 30 (242) T Aug 31 (243) F Sep 01 (244) S Sep 02 (245) S Sep 03 (246) ------------------------------------------------------------------------------- Upcoming events: 2023: * Sep 23-Oct 3 Parker Solar Probe perihelion pass * Oct 1-10 Solar Orbiter Remote Sensing Window 10 * Oct 12-21 Solar Orbiter Remote Sensing Window 11 * Oct 23-Nov 1 Solar Orbiter Remote Sensing Window 12 * Nov 13 Solar Orbiter Full Disk Mosaic * Dec 25-Jan 3 Parker Solar Probe perihelion pass * Dec 28 Solar Orbiter off-point for Parker Solar Probe 2024: * Mar 13-24 Solar Orbiter Remote Sensing Window 13 * Mar 26-Apr 4 Parker Solar Probe perihelion pass * Mar 27-Apr 9 Solar Orbiter Remote Sensing Window 14 * Apr 12-15 Solar Orbiter Remote Sensing Window 15 * 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 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