STEREO Weekly Meeting Minutes for 2025-06-24 (Week 26) 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 25 (June 16-22) * On day 167 (Jun 16), during the DSS-53 support, turbo decoder lock was lost briefly at 07:15 UT. This anomaly resulted in the loss of 16 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. * On day 167 (Jun 16), DSN conducted a Mission Network Maintenance from 10:30 UT through 14:30 UT. After the maintenance, the MOPs team verified the SLE telemetry and command connectivity with DSN. * On day 169 (Jun 18), during the DSS-53 support, turbo decoder lock was lost briefly at 02:32 UT. This anomaly resulted in the loss of 90 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. See DR #M118015 for more information. * On day 169 (Jun 18), the DSS-34 Project Interface Test (PIT) was conducted successfully. The purpose was to validate Data Capture & Delivery (DCD) software. The MOC received telemetry and sent four commands. * On day 169 (Jun 18), the 177th momentum dump was executed successfully at 13:00 UT, which imparted an estimated delta V of 0.065 m/sec. This was the 96th momentum dump conducted without gyro use. After thruster operations completed, there was a 0.3 degree of roll angle error. Fine pointing stabilized 2.5 minutes after completion of the momentum dump. * On day 173 (Jun 22), during the DSS-53 support, turbo decoder lock was lost briefly at 07:39 UT. This anomaly resulted in the loss of 8 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 7.5 Gbits during this week. Week 26 (June 23-29) * Ahead has seventeen passes during the week, all at 720 kbps, and overall coverage is nominal. Week 27 (June 30 - July 6) * Ahead has seventeen passes during the week, all at 720 kbps, and overall coverage is nominal. * APL will be closed on Friday, July 4th, for Independence Day. Week 28 (July 7-13) * Ahead has twelve passes during the week, all at 720 kbps, and overall coverage is nominal. Week 29 (July 14-20) * Ahead has fourteen passes during the week, all at 720 kbps, and overall coverage is nominal. Week 30 (July 21-27) * Ahead has eighteen passes during the week, all at 720 kbps, and overall coverage is nominal. * The 178th momentum dump is scheduled for Wednesday, July 23rd, with ignition at 19:05 UT. Week 31 (July 28-Aug 3) * Ahead has sixteen passes during the week, all at 720 kbps, and overall coverage is nominal. * There is a DSN network maintenance event scheduled from Thursday, July 31st, at 23:00 to Friday, August 1st, at 02:00. Other COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 23 (174) T Jun 24 (175) W Jun 25 (176) T Jun 26 (177) F Jun 27 (178) S Jun 28 (179) S Jun 29 (180) ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jun 30 (181) T Jul 01 (182) W Jul 02 (183) T Jul 03 (184) F Jul 04 (185) Independence Day holiday S Jul 05 (186) S Jul 06 (187) ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 07 (188) T Jul 08 (189) W Jul 09 (190) T Jul 10 (191) F Jul 11 (192) S Jul 12 (193) S Jul 13 (194) ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 14 (195) T Jul 15 (196) W Jul 16 (197) T Jul 17 (198) F Jul 18 (199) S Jul 19 (200) S Jul 20 (201) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 21 (202) T Jul 22 (203) W Jul 23 (204) Ahead: Momentum dump, 19:05 UT T Jul 24 (205) F Jul 25 (206) S Jul 26 (207) S Jul 27 (208) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 28 (209) T Jul 29 (210) W Jul 30 (211) T Jul 31 (212) F Aug 01 (213) S Aug 02 (214) S Aug 03 (215) Upcoming events: 2025: * Sep 7-12 Solar Orbiter Remote Sensing Window 22 * Sep 13-23 Solar Orbiter Remote Sensing Window 23 * Sep 12-20 Parker Solar Probe perihelion pass * Oct 1-6 Solar Orbiter Remote Sensing Window 24 * 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 ########################################################################