STEREO Weekly Meeting Minutes for 2020-12-29 (Week 53) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is in operational mode, but with a high 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 52 (Dec 21-27) * On day 359 (Dec 24), the SWAVES instrument team discovered a problem with the MOC poc_cmd_acceptor software while sending commands to their POC queue dated for the year 2021. The software was coded with a default timeout date of 2020-365-23:59:59 for commands that do not have a timeout value in the command header. Therefore, the software rejects commands without timeout dates included, which have enable times after the default date. The MOC ground software engineer has located the date in the code and has made the change. The SWAVES commands have been successfully resent, along with additional commands. SECCHI was unaffected, because they include timeouts in their commands. * On day 360 (Dec 25), the RIONet network prime circuit began exhibiting errors at 0644z, therefore, Goddard Comms released the line for maintenance and switched to the backup circuit at 1604z. Subsequently, the RIONet backup circuit failed at 1757z because of the early morning explosion in Nashville TN. The primary circuit was restored at 361-1830z (12/26), and the backup circuit was restored at 362-0457z (12/27). The loss of both RIONet circuits for 35 hours prevented the MOC from making SLE binds with DSN for commanding and real-time telemetry. * On day 360 (Dec 25), during the DSS-14 support for Ahead, the MOC could not perform SLE binds with DSN because both RIONet primary and backup network circuits were red. This anomaly resulted in the loss 5.6 hours of real-time telemetry, commanding and monitor data. The station performed the track successfully, and DSN forwarded the telemetry files using the nominal process via the internet. * On day 361 (Dec 26), during the DSS-63 support for Ahead, the MOC could not perform SLE binds with DSN because both RIONet primary and backup network circuits were red. This anomaly resulted in the loss 2.4 hours of real-time telemetry, commanding and monitor data. The station performed the track successfully, and DSN forwarded the telemetry files using the nominal process via the internet. * Although there were problems with SLE binds for an extended period of time, the MOC was able to get commands up well before the 60 hour software limit was reached. Hence, a contingency track on Sunday, Dec 27, was deleted. * On day 356 (Dec 21), the 56th SECCHI stepped calibration was executed at 1330z for midpoint in the Ahead orbit. This was the 25th SECCHI stepped calibration roll conducted without gyro use. * As of day 362 (Dec 27), all PLASTIC systems on Ahead are behaving well, except there is a high background count rate, which the team is continuing to monitor. * The average daily science data return for Ahead was 6.3 Gbits during this week. Week 53 (Dec 28-Jan 3) * Ahead has thirteen passes during the week, and overall coverage is nominal. There are eleven passes at 720 kbps, and two at 480 kbps. * APL will be closed for a half day on New Year's Eve, Dec 31, and will be closed all day on Friday, Jan 1, for the New Year's holiday. Week 01 (Jan 4-10) * Ahead has ten tracks during the week, and overall coverage is nominal. There are five tracks at 720 kbps, four at 480 kbps, and one at 360 kbps. An ESA Cebreros pass is scheduled for Thursday, Jan 7, and an ESA New Norcia track is scheduled for Saturday, Jan 9. Week 02 (Jan 11-17) * Ahead has ten tracks during the week, and overall coverage is nominal. There are nine passes at 720 kbps, and one at 480 kbps. * The 134th momentum dump on Ahead is scheduled for Monday, Jan 11, with ignitition at 19:00 UT. * The seventh Parker Solar Probe perihelion pass campaign is scheduled for Jan 13-23. Week 03 (Jan 18-24) * Ahead has nine passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, and four at 480 kbps. * Monday, Jan 18, is Martin Luther King Day, which is an APL holiday. * An ESA Cebreros pass is scheduled for Tuesday, Jan 19. * A return-to-service pass for station 43 is scheduled for Saturday, Jan 23. There will be no instrument commanding or SSR playback during this pass. * The Parker Solar Probe perihelion pass period ends on Saturday, Jan 23. Week 04 (Jan 26-31) * Ahead has ten passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and three at 480 kbps. An ESA New Norcia pass is scheduled for Thursday, Jan 28. Week 05 (Feb 1-7) * Ahead has nine passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and two at 480 kbps. * Solar Orbiter will be running a Remote Sensor Synoptics campaign Feb 1-19. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 53: M Dec 28 (363) T Dec 29 (364) W Dec 30 (365) T Dec 31 (366) F Jan 01 (001) New Year S Jan 02 (002) S Jan 03 (003) ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Jan 04 (004) T Jan 05 (005) W Jan 06 (006) T Jan 07 (007) F Jan 08 (008) S Jan 09 (009) S Jan 10 (010) ------------------------------------------------------------------------------- Scheduled activities for Week 02: M Jan 11 (011) Ahead: Momentum dump, 19:00 UT T Jan 12 (012) W Jan 13 (013) Start of Parker Solar Probe perihelion pass T Jan 14 (014) F Jan 15 (015) Ahead: EUVI 171A Deep Field, COR2 deep field S Jan 16 (016) Ahead: EUVI 171A Deep Field, COR2 deep field S Jan 17 (017) Ahead: EUVI 171A Deep Field, COR2 pB series only Notes: * Parker Solar Probe perihelion pass, Jan 13-23. ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 18 (018) Martin Luther King Day Ahead: EUVI 171A Deep Field, COR2 pB series only T Jan 19 (019) W Jan 20 (020) T Jan 21 (021) F Jan 22 (022) S Jan 23 (023) Ahead: Return-to-service pass with station 43 End of Parker Solar Probe perihelion pass S Jan 24 (024) Notes: * Parker Solar Probe perihelion pass, Jan 13-23. ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 25 (025) T Jan 26 (026) W Jan 27 (027) T Jan 28 (028) F Jan 29 (029) S Jan 30 (030) S Jan 31 (031) ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Feb 01 (032) Start of Solar Orbiter Remote Sensor Synoptics T Feb 02 (033) W Feb 03 (034) T Feb 04 (035) F Feb 05 (036) S Feb 06 (037) S Feb 07 (038) Notes: * Solar Orbiter Remote Sensor Synoptics, Feb 1-19 ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2021: * Feb 1-19 Solar Orbiter Remote Sensor Synoptics * Feb 15 Ahead: Momentum dump * Feb 20 Parker Solar Probe Venus flyby * Feb 20-25 Solar Orbiter Remote Sensor Checkout Window 2 * Mar 21-24 Solar Orbiter Remote Sensor Checkout Window 3 * Apr 21-28 Solar Orbiter Remote Sensor Synoptics * Apr 25-May 4 Parker Solar Probe perihelion pass * May 13-Jul 15 Betelgeuse visible in SECCHI HI2 with 180 degree roll * Aug 5-15 Parker Solar Probe perihelion pass * Oct 16 Parker Solar Probe Venus flyby * Nov 17-26 Parker Solar Probe perihelion pass 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Mar 13-23 Parker Solar Probe perihelion pass * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth * Aug 21 Parker Solar Probe Venus flyby * Sep 23-Oct 3 Parker Solar Probe perihelion pass * Dec 25-Jan 3 Parker Solar Probe perihelion pass 2024: * Mar 26-Apr 4 Parker Solar Probe perihelion pass * 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: * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit