STEREO Weekly Meeting Minutes for 2025-10-28 (Week 44) 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 43 (Oct 20-26) * On day 294 (Oct 21), during the DSS-56 support, turbo decoder lock was lost briefly at 03:20 UT. This anomaly resulted in the loss of 17 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. * On day 295 (Oct 22), during the DSS-65 support, commanding was delayed by 12 minutes until 02:51 UT, due to command modulation activating late. This anomaly resulted in the loss of 12 minutes of commanding and 20 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. See DR #M118387 for more information. * On day 295 (Oct 22), during the DSS-25 support, turbo decoder lock was lost briefly at 10:22 UT. This anomaly resulted in the loss of two frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. * On day 296 (Oct 23), during the DSS-56 support, the uplink was lost at 09:09 UT through EOT, due to the transmitter tripping off. This anomaly resulted in the loss of 21 minutes of commanding and 2-way tracking data, and 1150 frames of SSR data. The MOPs team repositioned the SSR pointers on the subsequent DSS-25 support and recovered all the affected data. See DR #M118392 for more information. * On day 298 (Oct 25), during the DSS-56 support, turbo decoder lock was lost briefly at 03:53 UT. This anomaly resulted in the loss of 48 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. * The average daily science data return for Ahead was 7.6 Gbits during this week. Week 44 (Oct 27-Nov 2) * Ahead has sixteen passes during the week, all at 720 kbps, and overall coverage is nominal. * Daylight Savings Time ends Sunday, Nov 2nd. Week 45 (Nov 3-9) * Ahead has fifteen passes during the week, all at 720 kbps, and overall coverage is nominal. Week 46 (Nov 10-16) * Ahead has thirteen passes during the week, all at 720 kbps, and overall coverage is nominal. * APL will be closed on Tuesday, November 11 for the Veterans Day holiday. * An ESA Malargue track is scheduled for Thursday, November 13th, from 07:30 to 09:50 UT. * The 6th IMU2 EEPROM refresh is scheduled on Ahead on Thursday, November 13th, at 11:00 UT. This procedure is recommended by the manufacturer to be conducted every three years. Week 47 (Nov 17-23) * Ahead has thirteen passes during the week, all at 720 kbps, and overall coverage is nominal. * The 181st momentum dump is scheduled for Tuesday, November 18th, at 18:30 UT. Week 48 (Nov 24-30) * Ahead has twelve passes during the week, all at 720 kbps, and overall coverage is nominal. Week 49 (Dec 1-7) * Ahead has fifteen passes during the week, all at 720 kbps, and overall coverage is nominal. * An ESA Malargue track is scheduled for Tuesday, December 2nd, from 07:00 to 08:10 UT. * The 72nd SECCHI stepped calibration roll is scheduled for Wednesday, December 3rd, at 22:30 UT. * The 19th battery discharge event will take place on Thursday, December 4th at 12:00 UT. Other * NRL personnel are currently unable to access their VPN, due to a security concern, but still have email access. There is some concern that the current federal government shutdown is consuming the NRL operating funds and the lab may have to shut down if the situation persists too much longer. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 27 (300) T Oct 28 (301) W Oct 29 (302) T Oct 30 (303) F Oct 31 (304) S Nov 01 (305) S Nov 02 (306) ------------------------------------------------------------------------------- Scheduled activities for Week 45: M Nov 03 (307) T Nov 04 (308) W Nov 05 (309) T Nov 06 (310) F Nov 07 (311) S Nov 08 (312) S Nov 09 (313) ------------------------------------------------------------------------------- Scheduled activities for Week 46: M Nov 10 (314) T Nov 11 (315) Veterans Day W Nov 12 (316) T Nov 13 (317) Ahead: IMU2 EEPROM refresh F Nov 14 (318) S Nov 15 (319) S Nov 16 (320) ------------------------------------------------------------------------------- Scheduled activities for Week 47: M Nov 17 (321) T Nov 18 (322) Ahead: Momentum dump, 18:30 UT W Nov 19 (323) T Nov 20 (324) F Nov 21 (325) S Nov 22 (326) S Nov 23 (327) ------------------------------------------------------------------------------- Scheduled activities for Week 48: M Nov 24 (328) T Nov 25 (329) W Nov 26 (330) T Nov 27 (331) F Nov 28 (332) S Nov 29 (333) S Nov 30 (334) ------------------------------------------------------------------------------- Scheduled activities for Week 49: M Dec 01 (335) T Dec 02 (336) W Dec 03 (337) Ahead: SECCHI stepped calibration roll, 22:30 T Dec 04 (338) F Dec 05 (339) S Dec 06 (340) S Dec 07 (341) ------------------------------------------------------------------------------- Upcoming events: 2025: * Dec 9-17 Parker Solar Probe perihelion pass 2026: * Feb 12-27 Solar Orbiter Remote Sensing Window 25 * Feb 28-Mar 10 Solar Orbiter Remote Sensing Window 26 * Mar 8-16 Parker Solar Probe perihelion pass * Mar 29-Apr 3 Solar Orbiter Remote Sensing Window 27 * Jun 4-12 Parker Solar Probe perihelion pass * Aug 4-14 Solar Orbiter Remote Sensing Window 28 * Aug 15-25 Solar Orbiter Remote Sensing Window 29 * Sep 1-9 Parker Solar Probe perihelion pass * Sep 11-21 Solar Orbiter Remote Sensing Window 30 * Nov 28-Dec 6 Parker Solar Probe perihelion pass * 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 ######################################################################## Access the STEREO-SCI-OPS Home Page and Archives: http://listserv.jhuapl.edu/scripts/wa.exe?A0=STEREO-SCI-OPS Unsubscribe from the STEREO-SCI-OPS List: http://listserv.jhuapl.edu/scripts/wa.exe?TICKET=NzM5NDA3IGxhbi5qaWFuQE5BU0EuR09WIFNURVJFTy1TQ0ktT1BTILQVWhe00afS&c=SIGNOFF ########################################################################