STEREO Weekly Meeting Minutes for 2025-04-29 (Week 18) 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 17 (Apr 21-27) * On day 112 (Apr 22), during the DSS-53 support, turbo decoder lock was lost briefly at 06:19 UT. This anomaly resulted in the loss of 61 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. See DR #M117849 for more information. * On day 115 (Apr 25), during the DSS-35 support, the transmitter was declared red, due to a hardware problem. This anomaly resulted in the loss of two hours of real-time commanding and 2-way tracking data. See DR #C118399 for more information. * On day 116 (Apr 26), during the DSS-65 support, turbo decoder lock was lost briefly at 05:08 UT. This anomaly resulted in the loss of 145 frames of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. See DR #M117853 for more information. * On day 117 (Apr 27), during the DSS-35 support, the transmitter was declared red, due to a hardware problem. This anomaly resulted in the loss of 3.9 hours of real-time commanding and 2-way tracking data. See DR #C118415 for more information. * The average daily science data return for Ahead was 8.4 Gbits during this week. Week 18 (Apr 28 - May 4) * Ahead has sixteen passes during the week, all at 720 kbps, and overall coverage is nominal. Week 19 (May 5-11) * Ahead has fourteen passes during the week, all at 720 kbps, and overall coverage is nominal. A track on Tuesday, May 6, was removed from the schedule. * The 176th momentum dump is scheduled for Wednesday, May 7th, at 13:00 UT. Week 20 (May 12-18) * Ahead has thirteen passes during the week, all at 720 kbps, and overall coverage is nominal. * The DSN network maintenance event originally scheduled for Wednesday, May 14, has been canceled. Week 21 (May 19-25) * Ahead has fourteen passes during the week, all at 720 kbps, and overall coverage is nominal. Week 22 (May 26 - June 1) * Ahead has fourteen passes during the week, all at 720 kbps, and overall coverage is nominal. * APL will be closed on Monday, May 26, for the Memorial Day holiday. * An ESA Malargue track is scheduled for Wednesday, May 28. Week 23 (June 2-8) * Ahead has fifteen passes during the week, all at 720 kbps, and overall coverage is nominal. * The 75th SECCHI stepped calibration roll is scheduled for Tuesday, June 3rd, at 14:50 UT. Other COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 18: M Apr 28 (118) T Apr 29 (119) W Apr 30 (120) Solar Orbiter Remote Sensing Window 21 ends T May 01 (121) F May 02 (122) S May 03 (123) S May 04 (124) Notes: * Solar Orbiter Remote Sensing Window 21, Apr 25-30 ------------------------------------------------------------------------------- Scheduled activities for Week 19: M May 05 (125) T May 06 (126) W May 07 (127) Ahead: Momentum dump, 13:00 UT T May 08 (128) F May 09 (129) S May 10 (130) S May 11 (131) ------------------------------------------------------------------------------- Scheduled activities for Week 20: M May 12 (132) T May 13 (133) W May 14 (134) T May 15 (135) F May 16 (136) S May 17 (137) S May 18 (138) ------------------------------------------------------------------------------- Scheduled activities for Week 21: M May 19 (139) T May 20 (140) W May 21 (141) T May 22 (142) F May 23 (143) S May 24 (144) S May 25 (145) ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 26 (146) Memorial Day holiday T May 27 (147) W May 28 (148) T May 29 (149) F May 30 (150) S May 31 (151) S Jun 01 (152) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 02 (153) T Jun 03 (154) Ahead: SECCHI stepped calibration roll, 14:50 UT W Jun 04 (155) T Jun 05 (156) F Jun 06 (157) S Jun 07 (158) S Jun 08 (159) Upcoming events: 2025: * Jun 15-24 Parker Solar Probe perihelion pass * 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 1-16 Solar Orbiter Remote Sensing Window 24 * Dec 9-17 Parker Solar Probe perihelion pass 2026: * Mar 8-16 Parker Solar Probe perihelion pass * Jun 4-12 Parker Solar Probe perihelion pass * Sep 1-9 Parker Solar Probe perihelion pass * 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=NzM5MjQ2IHNoYWVsYS5pLmpvbmVzbWVjaG9sc2t5QE5BU0EuR09WIFNURVJFTy1TQ0ktT1BTID6aADWmLhmq&c=SIGNOFF ########################################################################