STEREO Weekly Meeting Minutes for 2019-06-04 (Week 23) 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 still under development. The possibility of modifying the commonly used Perl mirror script to use ftps instead of ftp was found to be not feasible. The sftp protocol is still allowed by NASA, but this requires each user to have an account. It should also be possible to set up an ftps server, and the SSC would like to know whether anyone has a desire to use this protocol. 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 22 (May 27-Jun 2) * On day 149 (May 29), a short test track with the DSN test station, DTF-21, was conducted to test the command binding fix of the new command workstation in the MOC using CCSDS SLE bluebook version 4. The initial issue of the command and control application crashing after commanding binding multiple times was recreated. After the software patch was applied, 50 repeated command binds were successful and a no-op command was sent satisfactory. * On day 150 (May 30), during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 0427z and 0612z. This anomaly resulted in the loss of six frames of SSR data. * On day 150 (May 30), another short test track with the DSN test station, DTF-21, was conducted to test the command binding fix of the new command workstation in the MOC using CCSDS SLE bluebook version 4. 35 repeated command binds were successful and a no-op command was sent satisfactory. * On day 153 (Jun 2), during the DSS-14 support for Ahead, DTT v13.3 PITs was to validate tracking and telemetry performance. The MOC sent four commands successfully and all telemetry was received as expected. * The average daily science data return for Ahead was 6.2 Gbits during this week. Week 23 (Jun 3-9) * The MOC plans to switch back to SLE version 4 for commanding this afternoon, starting with the station 14 track at 20:00 UT. * Thursday, Jun 6, telemetry, tracking and commanding software V1.6 demonstration track with DSN-14 for 1.1 hrs (no instrument commanding and no SSR playback as the data are not committed.) * Ahead has ten passes during the week, all at 720 kbps, and overall coverage is nominal. Week 24 (Jun 10-16) * Ahead has eight passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and one at 240 kbps. Week 25 (Jun 17-23) * Wednesday, Jun 19, there will be a 3 hour project interface test of the three links per operator concept of operations with DSN-14 (no instrument commanding and no SSR playback as the data are not committed.) * On Friday, Jun 21, the MOC will begin using the backup workstation with SLE version 4. At that point, all three workstations--primary, backup, and recovery--will be using version 4. * Ahead has ten passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, one at 360 kbps, one at 240 kbps, and one at 160 kbps. Week 26 (Jun 24-30) * The 120th momentum dump is scheduled for 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. * 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 28 (Jul 8-14) * 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. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 03 (154) T Jun 04 (155) W Jun 05 (156) T Jun 06 (157) Ahead: Project Interface Test, DSN-14 F Jun 07 (158) S Jun 08 (159) S Jun 09 (160) ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 10 (161) T Jun 11 (162) W Jun 12 (163) T Jun 13 (164) F Jun 14 (165) S Jun 15 (166) S Jun 16 (167) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 17 (168) T Jun 18 (169) W Jun 19 (170) Ahead: Project Interface Test, DSN-14 T Jun 20 (171) F Jun 21 (172) S Jun 22 (173) S Jun 23 (174) ------------------------------------------------------------------------------- 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) 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) ------------------------------------------------------------------------------- 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