STEREO Weekly Meeting Minutes for 2012-09-25 (Week 39) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 38 (Sep 17-23) * On day 261 (Sep 17), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0603z. This anomaly resulted in the loss of 75 frames of SSR data. See DR# N108415 for more information. * On day 263 (Sep 19), during the DSS-14 support for Ahead, initial telemetry lock was established late at 1234z due to a sub-reflector problem that occurred before the start of the track. The sub-reflector was fixed at 45° for the remainder of the track. This anomaly resulted in the loss of one frame of SSR data. See DR# G113236 for more information. * On day 266 (Sep 22), during the DSS-63 support for Ahead, the command uplink was delayed eight minutes at 0507z due to a latency issue with monitor data coming from the station. Also, turbo decoder lock was lost intermittently beginning at 0627z through 0739z. This anomaly resulted in the loss of 121 frames of SSR data. A DR was requested for the turbo decoder anomaly. See DR# N108422 more information. * On day 267 (Sep 23), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 1605z. This anomaly resulted in the loss of 74 frames of SSR data. A DR was requested. * On day 262 (Sep 18), the 23rd SECCHI stepped calibration on Ahead was executed for the aphelion in the orbit. * On day 262 (Sep 18) during the DSS-32 (New Norcia) support for Behind, turbo decoder lock was lost intermittently beginning at 1047z through 1134z due to weather. This anomaly resulted in the loss of 14 frames of SSR data. This anomaly is being investigated with ESA. * On day 263 (Sep 19), during the DSS-14 support for Behind, initial telemetry lock was established late at 1752z due to a sub-reflector problem that occurred before the start of the track. The sub-reflector was fixed at 45° for the remainder of the track. SSR pointers were repositioned to minimize data loss. Later in the support, turbo decoder lock was lost briefly at 2101z. This anomaly resulted in the loss of one frame of SSR data. See DRs# G113237 and N108419 for more information. * On day 264 (Sep 20), during the DSS-14 support for Behind, telemetry lock was lost at 265-0004z for 46 minutes due to a sub-reflector problem. Station personnel made sub-reflector adjustments to resume tracking. This anomaly resulted in the loss of approximately 7.5 hours of SSR data for all instruments. See DR# G113240 for more information. Maintenance had been performed on the subreflector after the problems of the previous day, but it failed again. * On day 266 (Sep 22), during the DSS-65 support for Behind, the command uplink was delayed eight minutes at 1012z due to a latency issue with monitor data coming from the station. Also, turbo decoder lock was lost briefly at 1044z and 1313z. This anomaly resulted in the loss of 36 frames of SSR data. See DRs# N108425 and N108444 for more information. * On day 267 (Sep 23), during the DSS-65 support for Behind, turbo decoder lock was lost intermittently beginning at 1037z through 1251z due to rain. This anomaly resulted in the loss of 20 minutes of real-time telemetry and approximately 55 minutes of SSR data for all instruments. See DR# M106918 for more information. * The average daily SSR playback volume during the week was 5.9 gigabits for Ahead, and 4.9 gigabits for Behind. * DSN reports that the subreflector on station 14 will be fixed at 45° until Thursday, Sep 27. Week 39 (Sep 24-30) * Ahead reaches aphelion on Sep 26. * Sep 30 marks the end of the 2nd extended mission for STEREO. * Momentum dumps were successfully carried out for both spacecraft during the week, with the 50th dump on Ahead occuring yesterday (Sep 24), and the 45th dump on Behind happening this morning (Sep 25). These dumps were scheduled a week early due to track coverage. * The second battery discharge cycling on Ahead is scheduled for tomorrow morning (Sep 26), starting at 14:00 UT. This will be for 2 hours during a station 14 track. * Project Interface Tests (PIT) will be carried out with the Ahead spacecraft on Thursday, Sep 27 for 1.8 hours using station 24, and Sunday, Sep 30 for 3.2 hours using station 26. Realtime data will be flowing during these tests, but there will be no instrument commanding or SSR playback. The MOC asked whether they needed to send commands during the Sunday test. The answer was that if the Thursday test is okay, then the Sunday test will only be to collect more ranging data. * Ahead has 70 meter passes every day except Thursday, Sep 27, with two passes on Tuesday, Sep 25, and Sunday, Sep 30. The first 70 meter pass on each of those two days, using station 63, will be at 720 kbps. There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Sep 24 (D14), Tuesday, Sep 25 (D63 at 720 kbps), Thursday, Sep 27 (D14, D63), and Friday, Sep 28 (D14). There are 9 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Friday, Sep 28. Week 40 (Oct 1-7) * Testing of the turbo encoding mode for the space weather beacon data will be carried out with Ahead on Wednesday, Oct 3, starting at 10:05 UT after the station 63 pass, and with Behind on Thursday, Oct 4, starting at 11:50 UT after the ESA New Norcia pass. * Ahead has 70 meter passes on Monday, Oct 1 (D14), Wednesday, Oct 3 (D63), Saturday, Oct 6 (D63), and Sunday, Oct 7 (D63). There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Oct 1 (D14 at 720 kbps), Friday, Oct 5 (D43, D14), and Saturday, Oct 6 (D14 at 720 kbps). There are 9 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Thursday, Oct 4. Week 41 (Oct 8-14) * Ahead has 70 meter passes on Monday, Oct 8 (D14), Tuesday, Oct 9 (D14), Wednesday, Oct 10 (D14), Friday, Oct 12 (D14), Saturday, Oct 13 (D63, D43), and Sunday, Oct 14 (D63). There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Tuesday, Oct 9 (D14), Thursday, Oct 11 (D43 at 720 kbps), Friday, Oct 12 (D43), and Sunday, Oct 14 (D63, D43). The D34 pass on Friday Oct 12 will be stepped to 240 kbps. There are 9 passes during the week, and overall coverage is nominal. Week 42 (Oct 15-21) * Ahead has 70 meter passes on Monday, Oct 15 (D14), Wednesday, Oct 17 (D63), Saturday, Oct 20 (D63, D14), and Sunday, Oct 21 (D63). There are 14 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Oct 15 (D43, D14), Tuesday Oct 16 (D14), Wednesday, Oct 17 (D63), Thursday, Oct 18 (D14), Saturday, Oct 20 (D14) and Sunday, Oct 21 (D63). There are 8 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Friday, Oct 19. Week 43 (Oct 22-28) * The second refresh of the IMU EEPROMs will be performed during the week. The EEPROMs for IMU1 on both spacecraft will be refreshed on Wednesday, Oct 24, and those for IMU2 on both spacecraft will be refreshed on Thursday, Oct 25. * Ahead has 70 meter passes on Monday, Oct 22 (D63, D14), Tuesday, Oct 23 (D14), Wednesday, Oct 24 (D14), Friday, Oct 26 (D63), Saturday, Oct 27 (D63), and Sunday, Oct 28 (D63, D43 at 720 kbps). There are 14 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Tuesday, Oct 23 (D63), Wednesday, Oct 24 (D63), Thursday, Oct 25 (D63), Friday, Oct 26 (D43), and Sunday, Oct 28 (D63). There are seven passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Monday, Oct 22. Week 44 (Oct 29-Nov 4) * The 51st momentum dump on Ahead is scheduled for Tuesday, Oct 30, with ignition at 15:00 UT. * Daylight savings time ends in the U.S. on Sunday, Nov 4. * Ahead has 70 meter passes on Monday, Oct 29 (D14), Tuesday, Oct 30 (D14), Wednesday, Oct 31 (D14), Friday, Nov 2 (D14), Saturday, Nov 3 (D63, D43), and Sunday, Nov 4 (D63). There are 11 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Oct 29 (D14), Tuesday, Oct 30 (D63, D14), Thursday, Nov 1 (D63), Friday, Nov 2 (D43), Saturday, Nov 3 (D14), and Sunday, Nov 4 (D14). There are 9 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Friday, Nov 2. Other * A report on the Turbo decoder issues will be distributed shortly. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 39: M Sep 24 (268) Ahead: Momentum dump, 16:00 UT T Sep 25 (269) Behind: Momentum dump, 15:00 UT W Sep 26 (270) T Sep 27 (271) F Sep 28 (272) S Sep 29 (273) S Sep 30 (274) ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Oct 01 (275) T Oct 02 (276) W Oct 03 (277) Ahead: Turbo beacon test, 10:05-04:55 next day T Oct 04 (278) Behind: Turbo beacon test, 11:50-17:40 F Oct 05 (279) S Oct 06 (280) S Oct 07 (281) Notes: * Tests of Turbo decoding of beacon data from European stations on both spacecraft. ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 08 (282) T Oct 09 (283) W Oct 10 (284) T Oct 11 (285) F Oct 12 (286) S Oct 13 (287) S Oct 14 (288) ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 15 (289) T Oct 16 (290) W Oct 17 (291) T Oct 18 (292) F Oct 19 (293) S Oct 20 (294) S Oct 21 (295) ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 22 (296) T Oct 23 (297) W Oct 24 (298) T Oct 25 (299) F Oct 26 (300) S Oct 27 (301) S Oct 28 (302) ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 29 (303) T Oct 30 (304) W Oct 31 (305) T Nov 01 (306) F Nov 02 (307) S Nov 03 (308) S Nov 04 (309) End of daylight savings time in U.S. ------------------------------------------------------------------------------- Upcoming events: 2012: * Nov 4 Behind: Switch downlink rate to 120 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * May 3 Ahead: Switch downlink rate to 120 kbps * Dec 12 Ahead: Mercury transit 2014: * Jan 20 Behind: End use of 480 kbps on 70 m DSN subnet * Apr 21 Behind: Resume use of 480 kbps on 70 m DSN subnet * Apr 29 Behind: Mercury transit * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet 2015: * Feb DAWN - Ceres arrival * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar 17 - Jul 14 (TBC) Ahead: Spacecraft behind Sun * Jul 2 Behind: Resume use of 480 kbps on 70 m DSN subnet * Aug 25 - Oct 19 (TBC) Behind: Spacecraft behind Sun * Sep 25 Behind: End use of 480 kbps on 70 m DSN subnet * Jul DAWN - End of nominal mission 2016: * Apr 3 Behind: Resume use of 480 kbps on 70 m DSN subnet * Jul 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