STEREO Weekly Meeting Minutes for 2019-06-25 (Week 26) ANNOUNCEMENTS ------------- * The SSC reports that all ftp servers at NASA will have to be shut down by July 31. Instrument teams that get their data via ftp from the stereoftp server will have to change their scripts to get the data from https://stereo-ssc.nascom.nasa.gov. A new procedure for updating SolarSoft is in beta testing. 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 25 (Jun 17-23) * On day 170 (Jun 19), during the DSS-65 support for Ahead, the STEREO MOC transitioned two command workstations to the SLE version 4 operational telemetry servers with TTC v1.6 and ended the use of SLE version 1. * On day 170 (Jun 19), DSS-14 conducted a successful Project Interface Test for the three links per operator (3-LPO) concept. * On day 171 (Jun 20), during the DSS-14 support for Ahead, the STEREO MOC transitioned the last x86 backup command workstation to the RIONet. During this track, MOPs tested the three command workstations and all are now functioning properly on the RIONET. Thanks to DSN and the instrument teams for their participation in the system testing. * On day 174 (Jun 23), during the DSS-43 support for Ahead, the MOC lost all SLE telemetry and command binds at 0417z due to AT&T network maintenance. MOPs arrived in the MOC at 0527z to re-bind the SLE telemetry and command system. The outage resulted in the loss of 1.2 hours of real-time telemetry and commanding. * The average daily science data return for Ahead was 6.1 Gbits during this week. Week 26 (Jun 24-30) * The 120th momentum dump is scheduled for this afternoon (Jun 25), with ignition at 17:30 UT. This will the 39th dump without using the gyros. * Ahead has eleven passes during the week, and overall coverage is nominal. There are nine passes at 720 kbps, and two at 240 kbps. Week 27 (Jul 1-7) * Thursday, Jul 4, is Independence Day, which is a holiday at APL. * Friday, Jul 5, there will be a 3 hour return-to-service demonstration track with station 25. There will be no instrument commanding or SSR playback during this track. * Ahead has ten passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, and two at 240 kbps. Week 28 (Jul 8-14) * Ahead has eleven passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, two at 360 kbps, and one at 240 kbps. Week 29 (Jul 15-21) * Ahead has ten passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, four at 360 kbps, and one at 240 kbsp. Week 30 (Jul 22-28) * 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 31 (Jul 29-Aug 4) * The 49th SECCHI stepped calibration roll is scheduled for Monday, Jul 29, starting at 12:10 UTC. This is the midpoint roll. System momentum is expected to be 7 N-m-s. This will be the 18th calibration roll without using the gyros. * Ahead has ten passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, two at 360 kbps, and two at 240 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 24 (175) T Jun 25 (176) Ahead: Momentum dump, 17:30 UT W Jun 26 (177) T Jun 27 (178) F Jun 28 (179) S Jun 29 (180) S Jun 30 (181) ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 01 (182) T Jul 02 (183) W Jul 03 (184) T Jul 04 (185) Fourth of July holiday F Jul 05 (186) Ahead: Return-to-service track with DSN-25 S Jul 06 (187) S Jul 07 (188) ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 08 (189) T Jul 09 (190) W Jul 10 (191) T Jul 11 (192) F Jul 12 (193) S Jul 13 (194) S Jul 14 (195) ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 15 (196) T Jul 16 (197) W Jul 17 (198) T Jul 18 (199) F Jul 19 (200) S Jul 20 (201) S Jul 21 (202) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 22 (203) T Jul 23 (204) W Jul 24 (205) T Jul 25 (206) F Jul 26 (207) S Jul 27 (208) S Jul 28 (209) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 29 (210) Ahead: SECCHI stepped calibration roll, 12:10 UT T Jul 30 (211) W Jul 31 (212) T Aug 01 (213) F Aug 02 (214) S Aug 03 (215) S Aug 04 (216) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * 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