STEREO Weekly Meeting Minutes for 2020-02-04 (Week 6) 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 05 (Jan 24-Feb 2) * On day 027 (Jan 27), the DSS-63 support for Ahead was cancelled as the antenna was declared red due to failed antenna servo drives. With an ETRO of day 030-1530z and consecutive DSS-63 supports, three ESA supports were added for days 027 (Jan 27) and 028 (Jan 28). SSR pointers were repositioned and all SSR data was recovered. For more information, see DR #M112019. * On day 028 (Jan 28), during the DSS-74 ESA support for Ahead with New Norcia, the uplink was not enabled due to a miss-communication error. This anomaly resulted in the loss of 3 hours of command and two-way tracking data. All SSR data was recovered. * On day 028 (Jan 28), the DSS-63 support for Ahead was cancelled as the antenna was declared red due to failed antenna servo drives. For more information, see DR #M112023. * On day 032 (Feb 01), during the DSS-34 support for Ahead, turbo decoder lock was lost intermittently from 0638z through 1005z. This anomaly resulted in the loss of 17 frames of SSR data. * On days 028 (Jan 28), 029 (Jan 29), and 031 (Jan 31), the PLASTIC team continued to step the Post Acceleration (PAC) power supply high voltage. 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 6.7 Gbits during this week. Week 06 (Feb 3-9) * On day 034 (Feb 03) PLASTIC encountered an error flag. Day 035 (Feb 04) at 16:00z PLASTIC restarted the recovery process * 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 occurred 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. Week 11 (Mar 9-15) * Ahead has fourteen passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, and three at 360 kbps one 240. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 09 (069) T Mar 10 (070) W Mar 11 (071) T Mar 12 (072) F Mar13 (073) S Mar 14 (074) S Mar 15 (075) ------------------------------------------------------------------------------- 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