STEREO Weekly Meeting Minutes for 2026-09-22 (Week 39) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is in operational mode, but with a moderately higher than normal background rate. * After the initial loss of communications with the Behind observatory in September of 2014, NASA stopped periodic recovery operations with the last support on October 17, 2018. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 38 (Sep 14-20) * On day 258 (Sep 15), 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 260 (Sep 17), during the DSS-54 support, turbo decoder lock was lost briefly at 06:58 UT. This anomaly resulted in the loss of one frame of SSR data. The MOPs team repositioned the SSR pointers during the support and recovered all the affected data. * On day 262 (Sep 19), during the DSS-54 support, the antenna was declared red, due to a hardware problem. This anomaly resulted in the loss of 5.5 hours of real-time telemetry, commanding, tracking, and SSR data. The MOPs team repositioned the SSR pointers during the subsequent DSS-23 track and recovered all the affected data, except for the loss of ~5.5 hours of SECCHI data for day 261 from 13:55 thru 19:23 UT. See DR #M119484 for more information. * On day 262 (Sep 19), during the DSS-23 support, turbo decoder lock was lost briefly at 14:59 UT. This anomaly resulted in the loss of twelve 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 7.1 Gbits during this week. Week 39 (Sep 21-27) * Ahead has fifteen tracks during the week, one at 720 kbps, fourteen at 480 kbps. * An ESA Malargue track was conducted today, September 22nd, from 09:00 to 11:15 UT. * An ESA Malargue track is scheduled for Wednesday, September 23rd, from 09:00 to 11:25 UT. Week 40 (Sep 28 - Oct 4) * Ahead has twelve tracks during the week, all twelve at 480 kbps. Week 41 (Oct 5-11) * Ahead has ten tracks during the week, all ten at 480 kbps. * An ESA Malargue track is scheduled for Tuesday, October 6th, from 08:45 to 11:05 UT. * There is a DSN mission network maintenance scheduled for Tuesday, October 6th, from 16:40 to 20:40 UT. * There is a DCD PIT test scheduled for Saturday, October 10th, from 18:25 to 19:55 during the DSS-36 track. There will be no SSR playback or instrument commanding during this activity. Week 42 (Oct 12-18) * Ahead has fourteen tracks during the week, one at 720 kbps, and thirteen at 480 kbps. * The 189th momentum dump is scheduled for Wednesday, October 14th, at 20:15 UT. * An ESA Malargue track is scheduled for Friday, October 16th, from 06:55 to 08:45 UT. Week 43 (Oct 19-25) * Ahead has thirteen tracks during the week, one at 720 kbps, and twelve at 480 kbps. Week 44 (Oct 26 - Nov 1) * Ahead has twelve tracks during the week, all twelve at 480 kbps. * Monday, October 26th, is the 20th STEREO launch anniversary. * The 81st SECCHI stepped calibration roll is scheduled for Friday, October 30th, at 04:45 UT. * Daylight Savings Time ends Sunday, Nov 1st. Other COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 39: M Sep 21 (264) SolO RSW 24 ends T Sep 22 (265) W Sep 23 (266) T Sep 24 (267) F Sep 25 (268) S Sep 26 (269) S Sep 27 (270) Notes: * Solar Orbiter Remote Sensing Window 30, Sep 11-21 ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Sep 28 (271) T Sep 29 (272) W Sep 30 (273) T Oct 01 (274) F Oct 02 (275) S Oct 03 (276) S Oct 04 (277) ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 05 (278) T Oct 06 (279) W Oct 07 (280) T Oct 08 (281) F Oct 09 (282) S Oct 10 (283) S Oct 11 (284) ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 12 (285) T Oct 13 (286) W Oct 14 (287) Ahead: Momentum dump, 20:15 UT T Oct 15 (288) F Oct 16 (289) S Oct 17 (290) S Oct 18 (291) ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 19 (292) T Oct 20 (293) W Oct 21 (294) T Oct 22 (295) F Oct 23 (296) S Oct 24 (297) S Oct 25 (298) ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 26 (299) STEREO 20th Launch Anniversary T Oct 27 (300) W Oct 28 (301) T Oct 29 (302) F Oct 30 (303) Ahead: SECCHI stepped calibration roll, 04:45 UT S Oct 31 (304) S Nov 01 (305) ------------------------------------------------------------------------------- Upcoming events: 2026: * Nov 28-Dec 6 Parker Solar Probe perihelion pass * Dec 24 Solar Orbiter Venus flyby 2027: * Feb 25-Mar 4 Parker Solar Probe perihelion pass * Feb 8 Solar Orbiter Perihelion * May 24-31 Parker Solar Probe perihelion pass * July 7 Solar Orbiter Perihelion * Aug 21-28 Parer Solar Probe perihelion pass * Nov 17-24 Parker Solar Probe perihelion pass * Dec 4 Solar Orbiter Perihelion 2028: * Feb 14-21 Parker Solar Probe perihelion pass * Mar 18 Solar Orbiter Venus flyby * May 8 Solar Orbiter Perihelion * May 12-19 Parker Solar Probe perihelion pass * Aug 8-15 Parker Solar Probe perihelion pass * Oct 5 Solar Orbiter Perihelion * Nov 5-12 Parker Solar Probe perihelion pass 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=NzM5ODI3IHNoYWVsYS5pLmpvbmVzbWVjaG9sc2t5QE5BU0EuR09WIFNURVJFTy1TQ0ktT1BTIONO%2Fe5vX26v&c=SIGNOFF ########################################################################