STEREO Weekly Meeting Minutes for 2014-05-20 (Week 21) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 20 (May 12-18) * On day 132, May 12, during the DSS-14 support for Behind, turbo decoder lock was lost briefly at 2305z. This anomaly resulted in the loss of two frames of SSR data. * On day 134, May 14, MOps permanent macro release 1.1.20 was copied to EEPROM on both spacecraft. This release removed all SSR housekeeping double playback commands from all relevant macros to ensure all attitude history data is downlinked. * On day 135, May 15, the Ahead SECCHI instrument reset at 13:40:47z. The SECCHI team reconfigured the instrument to operational mode at 1700z. This was the 35th reset of SECCHI on the Ahead spacecraft. * On day 137, May 17, during the DSS-43 support for Behind, turbo decoder lock was briefly at 0103z, 0248z and 0521z. This anomaly resulted in the loss of five frames of SSR data. * On day 137, during the DSS-65 support for Behind, turbo decoder lock was briefly at 1120z, then again intermittently between 1228z and 1235z. This anomaly resulted in the loss of 23 frames of SSR data. * On day 137, at 0140z, a test of the HGA side lobe RF pattern on Behind was conducted with the DSN during the DSS-43 support. The HGA was off-pointed 9 degrees and back, at 0.2 degrees increments during a 45 minute period. The purpose of this test was to characterize the received signal power on the side lobes of the HGA. Analysis of the test data is underway. * The average daily SSR playback volume was 5.1 Gbits for both Ahead and Behind during this week. Week 21 (May 19-25) * The 30th SECCHI stepped calibration roll on Ahead is being performed May 20, starting at 14:45 UT. The system momentum is expected to be 1 N-m-s. This is the midpoint roll. Real time commanding set up for PLASTIC to adjust MCP voltage. * LGA Calibration test on Behind (was scheduled for May 23) is being rescheduled. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes, all using station 14 at 720 kbps, are scheduled for Tuesday, May 20, Friday, May 23, and Sunday, May 25. The following passes will be carried out at 160 kbps: Wednesday, May 21 (D55), and Saturday, May 24 (D65). The following station 26 passes will be carried out at 240 kbps: Monday, May 19, and Thursday, May 22. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes, all at 720 kbps, are scheduled for Monday, May 19 (D63), Wednesday, May 21 (D14), and Friday, May 23 (D63). The following passes will be carried out at 160 kbps: Tuesday, May 20 (D24), Thursday, May 22 (D54), Friday, May 23 (D24), and Saturday, May 24 (D55, D15). The station 26 pass on Sunday, May 25, will be carried out at 240 kbps. Week 22 (May 26-Jun 1) * Monday, May 26, is Memorial Day * On Wednesday, May 28, parameters will be loaded to C&DH RAM for C&DH and D&C on both spacecraft in preparation for conjunction. Date and time tentative. * Ahead has 12 passes during the week, and overall coverage is nominal. 70 meter passes, all at 720 kbps, are scheduled for Monday, May 26 (D14), Friday, May 30 (D63), and Saturday, May 31 (D63). The following passes will be carried out at 160 kbps: Tuesday, May 27 (D55), Friday, May 30 (D26), and Sunday, Jun 1 (D25). The station 26 pass on Wednesday, May 28, will be carried out at 240 kbps. * Behind has 8 passes during the week, and overall coverage is nominal. 70 meter passes, all at 720 kbps, are scheduled for Monday, May 26 (D63), Tuesday, May 27 (D14), and Saturday, May 31 (D14). The following station 55 passes will be carried out at 160 kbps: Wednesday, May 28, Thursday, May 29, and Friday, May 30. The station 26 pass on Sunday, Jun 1, will be carried out at 240 kbps. Week 23 (Jun 2-8) * Momentum dumps are scheduled for both spacecraft on Tuesday, Jun 3. The 68th dump on Ahead is scheduled to start at 17:30 UT, and the 63rd dump on Behind is scheduled for 23:00 UT. * On Sunday, Jun 8 there will be an LGA calibration test on Ahead using D63. Date and time tentative * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes, all at 720 kbps, are scheduled for Monday, Jun 2 (D63), Thursday, Jun 5 (D14), Saturday, Jun 7 (D14), and Sunday, Jun 8 (D63). The station 45 pass on Thursday, Jun 5, will be carried out at 160 kbps. The following station 26 passes will be carried out at 240 kbps: Monday, Jun 2, and Sunday, Jun 8. * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Jun 4 (D63 at 720 kbsp), and Friday, Jun 6 (D14). The following passes will be carried out at 160 kbps: Monday, Jun 2 (D25), Tuesday, Jun 3 (D15), Friday, Jun 6 (D55), Saturday, Jun 7 (D55), and Sunday, Jun 8 (D55). The station 26 pass on Saturday, Jun 7, will be carried out at 240 kbps. Week 24 (Jun 9-15) * On Tuesday, Jun 10 there will be downloads of MOps macros and fault protection releases to EEPROM on both spacecraft in preparation for solar conjunction. Date and time tentative. * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 9 (D14 at 720 kbps), Friday, Jun 13 (D63), and Saturday, Jun 14 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, Jun 10 (D24), Thursday, Jun 12 (D26), Friday, Jun 13 (D26), and Saturday, Jun 14 (D25). The following station 26 passes will be carried out at 240 kbps: Thursday, Jun 12, and Sunday, Jun 15. * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes, both at 720 kbps, are scheduled for Monday, Jun 9 (D63), and Wednesday, Jun 11 (D14). The following passes will be carried out at 160 kbps: Tuesday, Jun 10 (D55), Thursday, Jun 12 (D55), Friday, Jun 13 (D55), Saturday, Jun 14 (D54), and Sunday, Jun 15 (D25). Week 25 (Jun 16-22) * Mission operations spacecraft testing readiness review Thursday June 19 for Ahead * Ahead has 10 passes during the week, and overall coverage is nominal. A 70 meter pass with station 43 is scheduled for Saturday, Jun 21. The following passes will be carried out at 160 kbps: Thursday, Jun 19 (D55), Friday, Jun 20 (D65), and Saturday, Jun 21 (D65). The following station 26 passes will be carried out at 240 kbps: Wednesday, Jun 18, and Sunday, Jun 22. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 16 (D63), Friday, Jun 20 (D63 at 720 kbps), and Sunday, Jun 22 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Jun 16 (D65), Tuesday, Jun 17 (D54), Wednesday, Jun 18 (D66), Thursday, Jun 19 (D54), and Saturday, Jun 21 (D25). COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 21: M May 19 (139) T May 20 (140) Ahead: SECCHI stepped calibration roll, 14:45 UT W May 21 (141) T May 22 (142) F May 23 (143) S May 24 (144) S May 25 (145) ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 26 (146) Memorial Day T May 27 (147) W May 28 (148) T May 29 (149) F May 30 (150) S May 31 (151) S Jun 01 (152) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 02 (153) T Jun 03 (154) Momentum dumps, Ahead: 17:30 UT, Behind: 23:00 UT W Jun 04 (155) T Jun 05 (156) F Jun 06 (157) S Jun 07 (158) S Jun 08 (159) ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 09 (160) T Jun 10 (161) W Jun 11 (162) T Jun 12 (163) F Jun 13 (164) S Jun 14 (165) S Jun 15 (166) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 16 (167) T Jun 17 (168) W Jun 18 (169) T Jun 19 (170) F Jun 20 (171) S Jun 21 (172) S Jun 22 (173) ------------------------------------------------------------------------------- Upcoming events: 2014: * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * Sep 21 MAVEN arrival at Mars * Oct 17 Behind: Comet Siding Spring encounter with Mars 2015: * Jan 14 - Mar 19 (TBC) Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * Feb 11 - Jul 08 (TBC) Ahead: Spacecraft behind Sun * Aug 25 - Oct 19 (TBC) Behind: Possible interference from Sun * Jul DAWN - End of nominal mission 2016: * Jul 5 Juno arrival at Jupiter 2017: * Jul 11 Ahead: Switch downlink rate to 160 kbps * Jul 22 Behind: Switch downlink rate to 160 kbps 2018: * Mar 5 Ahead: Mercury transit