STEREO Weekly Meeting Minutes for 2020-01-28 (Week 5) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is in the process of returning to nominal operations after suffering a voltage anomaly on Dec 5. See more information below. * 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 04 (Jan 20-26) * On day 024 (Jan 24), during the DSS 63 support for Ahead, telemetry and command were lost at 1855z, through the end of track, when the antenna unexpectedly went to brake. This anomaly resulted in the loss of 1.6 hours of real-time telemetry, command and tracking data, as well as 6.9 hours SECCHI SSR data. SSR pointers were repositioned on the subsequent support for all in-situ instruments. The SECCHI SSR pointer was not repositioned since 71% of partition 19 had not been played back when telemetry was lost and MOps could not predict how much additional data would be recorded prior to the next unattended track without inadvertently wrapping their R/W pointer. For more information, see DR #M111998. * On day 025 (Jan 25), during the DSS 14 support for Ahead, the antenna was stowed between 0309z and 0405z due to a 4.9 magnitude earthquake near the Goldstone complex. This anomaly resulted in the loss of 0.9 hours of real-time telemetry, command and tracking data. All lost SSR data was recovered on the subsequent track as all SSR pointers were repositioned. For more information, see DR #G120845. * On day 026 (Jan 26), the entire DSS-63 track for Ahead was lost due to the antenna was declared red. This anomaly resulted in the loss of 3.6 hours of real-time telemetry, command and tracking data, as well as 16.3 hours SECCHI SSR data. SSR pointers were repositioned on the subsequent support for all in-situ instruments. The SECCHI SSR pointer was not repositioned since MOps could not predict how much data SECCHI would record prior to the next unattended track without inadvertently wrapping their R/W pointer. For more information, see DR #M112011. * From day 021 through 023 (Jan 21-23), a SECCHI COR2 and PSP WISPR deep field campaign was conducted on Ahead. Although there were gaps in the regular SECCHI telemetry stream during this period, the deep field data were in the SECCHI SSR2 partition, so that 50 hours worth of uninterrupted data came down between 18:01 on Jan 21 and 20:01 UT on Jan 23. * On days 021, 023, and 024 (Jan 21,23,24), the PLASTIC team continued to step the Post Acceleration (PAC) power supply high voltage on Ahead. All PLASTIC systems are behaving well, except there is a high background count rate, which the PLASTIC team is continuing to monitor. * The average daily science data return for Ahead was 4.8 Gbits during this week. Week 05 (Jan 24-Feb 2) * The MOC has been informed that station 63 is expected to be down until 15:30 on Thursday, Jan 30. To avoid triggering the 72 hour command loss timer, the MOC arranged three contacts with ESA. A 4.7 hour contact with ESA Malargue was carried out yesterday (Jan 27), and a 3 hour contact with ESA New Norcia was carried out this morning (Jan 28). There was no uplink during the latter pass because of a communication error, but the necessary commands to avoid triggering the timer went out on the previous pass. An additional 5 hour contact with Cebreros was underway during the telecon. * PLASTIC was performing realtime commanding during the telecon. * The next scheduled pass with station 63 is on Thursday. The antenna is expected to be back to normal operations by then. * Ahead has thirteen passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, and three at 360 kbps. * The Parker Solar Probe perihelion pass is from Jan 24 to Feb 4. Week 06 (Feb 3-9) * Ahead has twelve passes during the week, and overall coverage is nominal. There are eight passes at 720 bps, one at 480 kbps, and three at 360 kbps. * The Parker Solar Probe perihelion pass is from Jan 24 to Feb 4. Week 07 (Feb 10-16) * An additional SECCHI stepped calibration roll is scheduled for Tuesday, Feb 11, starting at 12 UT. This roll is in response to a new particle on the COR1 objective, which occured a few hours after the previous roll on Jan 14. System momentum is expected to be 2 N-m-s. This will be the 21st stepped calibration roll without using the gyros. * Ahead has twelve passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, one at 360 kbps, and one at 160 kbps. Week 08 (Feb 17-23) * Ahead has twelve passes during the week, and overall coverage is nominal. There are eleven passes at 720 kbps, and one at 360 kbps. Week 09 (Feb 24-Mar 1) * The 126th momentum dump is scheduled for Wednesday, Feb 26, with ignition at 19:30 UT. This will be the 45th momentum dump without using the gyros. * Ahead has eleven passes during the week, and overall coverage is nominal. There are 10 passes at 720 kbps, and one at 360 kbps. Week 10 (Mar 2-8) * Daily savings time in the US begins on March 8. * Ahead has fifteen passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and eight at 360 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 20 (020) T Jan 21 (021) Ahead: COR2 deep field campaign with Parker Solar Probe W Jan 22 (022) Ahead: COR2 deep field campaign with Parker Solar Probe T Jan 23 (023) Ahead: COR2 deep field campaign with Parker Solar Probe F Jan 24 (024) Start of Parker Solar Probe perihelion pass S Jan 25 (025) S Jan 26 (026) Notes: * PLASTIC in the process of being recovered to normal operations after power cycling. * Parker Solar Probe perihelion pass, Jan 24-Feb 4. ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 27 (027) T Jan 28 (028) W Jan 29 (029) T Jan 30 (030) F Jan 31 (031) S Feb 01 (032) S Feb 02 (033) Notes: * PLASTIC in the process of being recovered to normal operations after power cycling. * Parker Solar Probe perihelion pass, Jan 24-Feb 4. ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 03 (034) T Feb 04 (035) End of Parker Solar Probe perihelion pass. W Feb 05 (036) T Feb 06 (037) F Feb 07 (038) S Feb 08 (039) S Feb 09 (040) Notes: * Parker Solar Probe perihelion pass, Jan 24-Feb 4. ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 10 (041) T Feb 11 (042) Ahead: SECCHI stepped calibration roll, 12:00 W Feb 12 (043) T Feb 13 (044) F Feb 14 (045) S Feb 15 (046) S Feb 16 (047) ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 17 (048) T Feb 18 (049) W Feb 19 (050) T Feb 20 (051) F Feb 21 (052) S Feb 22 (053) S Feb 23 (054) ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 24 (055) T Feb 25 (056) W Feb 26 (057) Ahead: Momentum dump, 19:30 UT T Feb 27 (058) F Feb 28 (059) S Feb 29 (060) S Mar 01 (061) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 02 (062) T Mar 03 (063) W Mar 04 (064) T Mar 05 (065) F Mar 06 (066) S Mar 07 (067) S Mar 08 (068) Start of daylight savings time in US ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2020: * Apr 27-May 3 Solar Orbiter along Sun-Earth line (TBC after launch) * May Behind: Switch downlink rate to 360 kbps for 34 meter * Jun Ahead: Switch downlink rate to 360 kbps for 34 meter * Jun Behind: Switch downlink rate to 480 kbps for 34 meter * Jun 2-13 Parker Solar Probe perihelion pass * Jul 11 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter * Sep 22-Oct 2 Parker Solar Probe perihelion pass 2021: * Jan 13-23 Parker Solar Probe perihelion pass * Feb 20 Parker Solar Probe Venus flyby * Apr 25-May 4 Parker Solar Probe perihelion pass * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter * 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