STEREO Weekly Meeting Minutes for 2019-03-12 (Week 11) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. * 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 10 (Mar 4-10) * On day 063 (Mar 4), during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 0932z. This anomaly resulted in the loss of five frames of real-time telemetry and SSR data. * On day 067 (Mar 8), the DSS-26 support for Ahead beginning at 069-2050z was deleted to assist the MSL mission with switching over to their redundant avionics. Data return was not impacted. * On day 069 (Mar 10), for the DSS-14 support for Ahead, no uplink was available as the transmitter was declared red. This anomaly delayed the recovery from the SECCHI reset on day 069 and resulted in the loss of 4 hours of commanding and two-way tracking data. All SSR data were received. * On day 063 (Mar 4), the 117th momentum dump on Ahead was executed successfully at 1930z, which imparted an estimated delta V of 0.074 m/sec. This was the 36th momentum dump that did not use the IMU. After thruster operations completed, there was a 0.45 degree of roll angle error. Fine pointing stabilized 2.7 minutes after completion of the momentum dump. * On day 068 (Mar 9), the SECCHI instrument reset at 09:00:44z. The SECCHI team reconfigured the instrument to operational mode by 068-1200z. This was the 50th reset of the SECCHI instrument on the Ahead observatory. * On day 069 (Mar 10), the SECCHI instrument reset at 08:11:34z. The SECCHI team reconfigured the instrument to operational mode by 070-1800z. This was the 51st reset of the SECCHI instrument on the Ahead observatory. * The average daily science data return for Ahead was 5.6 Gbits during this week. Week 11 (Mar 11-17) * A redo of the SECCHI stepped calibration roll has been added on Friday, Mar 15, starting at 11:35 UTC. The COR1 telescope has seen two new particles land on the objective lens recently, one on Feb 5 and another on Feb 17, caused by micrometeor hits on the spacecraft creating sprays of debris. Since the recent calibration roll was in between these two events, it cannot be used to characterize the instrumental background before Feb 5 or after Feb 17. This will be the 16th stepped calibration roll without using the gyros. * SLE version 4 testing with the instrument teams will be carried out during the station 14 pass starting at 16:50 UT. There will be no instrument SSR playback during this pass; instrument data will be brought down in another track a few hours later. The SWAVES, SECCHI, IMPACT/IDPU and PLASTIC teams will do testing during this pass. IMPACT/SEP testing will be carried out Thursday, Mar 21. The instrument teams are requested to use the voice communications link during the testing. * Ahead has ten passes during the week, all at 720 kbps, and overall coverage is nominal. Week 12 (Mar 18-24) * SLE version 4 testing with IMPACT/SEP will be carried during the station 63 pass starting at 17:55 UT on Thursday, Mar 21. Additional testing with the instrument teams can be carried out if needed or desired. * Ahead has twelve passes during the week, all at 720 kbps, and overall coverage is nominal. Week 13 (Mar 25-31) * Sunday, Mar 31, marks the beginning of the second SECCHI observing campaign for Parker Solar Probe. This campaign goes through day 100 (Apr 10). * Ahead has eleven passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, and one pass at 240 kbps. Week 14 (Apr 1-7) * The SECCHI observing campaign for Parker Solar Probe perihelion continues throughout the week. This will include a COR2 deep exposure campaign, Apr 1-4. * Ahead has nine passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, and one at 240 kbps. Week 15 (Apr 8-14) * The SECCHI observing campaign for Parker Solar Probe perihelion ends on Wednesday, Apr 10. * Ahead has ten passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, one at 360 kbps, and one at 240 kbps. Week 16 (Apr 15-21) * Ahead has ten passes during the week, and overall coverage is nominal. There are nine passes at 720 kbps, and one at 240 kbps. Other * A momentum dump will need to be scheduled sometime during weeks 15 or 16. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 11 (070) T Mar 12 (071) W Mar 13 (072) T Mar 14 (073) F Mar 15 (074) Ahead: SECCHI stepped calibration roll, 11:35 UT Ahead: SLE testing with instrument teams, DSS-14, 16:50 UT S Mar 16 (075) S Mar 17 (076) ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 18 (077) T Mar 19 (078) W Mar 20 (079) T Mar 21 (080) Ahead: SLE testing with IMPACT/SEP, DSS-63, 17:55 UT F Mar 22 (081) S Mar 23 (082) S Mar 24 (083) ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 25 (084) T Mar 26 (085) W Mar 27 (086) T Mar 28 (087) F Mar 29 (088) S Mar 30 (089) S Mar 31 (090) Ahead: Begin SECCHI observations for Parker Solar Probe Notes: * Parker Solar Probe perihelion pass, Mar 31-Apr 10 ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Apr 01 (091) Ahead: SECCHI/COR2 deep exposure campaign T Apr 02 (092) Ahead: SECCHI/COR2 deep exposure campaign W Apr 03 (093) Ahead: SECCHI/COR2 deep exposure campaign T Apr 04 (094) Ahead: SECCHI/COR2 deep exposure campaign F Apr 05 (095) S Apr 06 (096) S Apr 07 (097) Notes: * Parker Solar Probe perihelion pass, Mar 31-Apr 10 ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 08 (098) T Apr 09 (099) W Apr 10 (100) Ahead: End SECCHI observations for Parker Solar Probe T Apr 11 (101) F Apr 12 (102) S Apr 13 (103) S Apr 14 (104) Notes: * Parker Solar Probe perihelion pass, Mar 31-Apr 10 ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 15 (105) T Apr 16 (106) W Apr 17 (107) T Apr 18 (108) F Apr 19 (109) S Apr 20 (110) S Apr 21 (111) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * Mar 31-Apr 10 Parker Solar Probe perihelion pass * Aug 28-Sep 7 Parker Solar Probe perihelion pass * Nov 4 Ahead: Close approach of Parker Solar Probe * Dec 26 Parker Solar Probe Venus flyby 2020: * Jan 24-Feb 4 Parker Solar Probe perihelion pass * 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