STEREO Weekly Meeting Minutes for 2019-05-28 (Week 22) 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 21 (May 20-26) * On day 142 (May 22), the MOC transitioned to the new command and control workstations using CCSDS SLE version 4. As STEREO has daily track coverage, one of the old command workstations will remain on the RIONet through June 21st (day 172) as a contingency. * On day 144 (May 24), the MOC switched back to SLE version 1 for commanding only due to an intermittent loss of command bind that occurred while using SLE version 4 on day 143. This switch back to version 1 is preventative to ensure commanding occurs during each track, since the MOC is operates with unattended tracks. A fix has been developed and will be tested with DTF-21 on day 148 (today). * On day 145 (May 25), during the first DSS-14 support for Ahead that day, initial telemetry in the MOC was nine minutes late at 0324z due to a configuration problem at the station. This anomaly resulted in the loss of seven minutes of real-time telemetry and SSR data. See DR #G120238 for more information. * On day 145 (May 25), during the second DSS-14 support for Ahead that day, turbo decoder lock was lost briefly at 2321z. This anomaly resulted in the loss of four frames of SSR data. * On day 141 (May 21), the 119th momentum dump on Ahead was executed successfully at 1930z, which imparted an estimated delta V of 0.086 m/sec. This was the 38th momentum dump that did not use the IMU. After thruster operations completed, there was a 0.36 degree of roll angle error. Fine pointing stabilized 2.3 minutes after completion of the momentum dump. * The average daily science data return for Ahead was 6.6 Gbits during this week. Week 22 (May 27-Jun 2) * Sunday, Jun 2, for 2.5 hrs there will be a project interface test for downlink tracking and telemetry (software v13.3) at DSN (no instrument commanding and no SSR playback as the data are not committed.) * Ahead has eleven passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, one at 360 kbps, one at 240 kbps, and one at 160 kbps. Week 23 (Jun 3-9) * Thursday, Jun 6, telemetry, tracking and commanding software V1.6 demonstration track with DSN-14 for 1.4 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. * Ahead has ten passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and 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 22: M May 27 (147) Memorial Day T May 28 (148) W May 29 (149) T May 30 (150) F May 31 (151) S Jun 01 (152) S Jun 02 (153) Ahead: Project Interface Test, DSN-14 ------------------------------------------------------------------------------- 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