STEREO Weekly Meeting Minutes for 2013-04-30 (Week 18) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * On day 119 (Apr 29), the SECCHI instrument for Behind reset at 21:33 UT. The SECCHI team reconfigured the instrument to operational mode at 01:04 UT the next day, and observations resumed at 02:00 UT. This was the 20th reset of SECCHI on the Behind spacecraft. * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 17 (Apr 22-28) * On day 112 (Apr 22), during the DSS-54 support for Ahead, turbo decoder lock was lost intermittently beginning at 0554z through 0735z. This anomaly resulted in the loss of four frames of SSR data. See DR #108777 for more information. * On day 114 (Apr 24), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0719z. This anomaly resulted in the loss of four frames of SSR data. See DR #108787 for more information. * On day 116 (Apr 26), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 1840z. This anomaly resulted in the loss of one frame of SSR data. See DR #108793 for more information. * On day 117 (Apr 27), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0645z and again at 1426z. This anomaly resulted in the loss of three frames of SSR data. See DR #108794 for more information. * On day 118 (Apr 28), during the DSS-45 support for Ahead, turbo decoder lock was lost briefly at 2005z and again at 2100z. This anomaly resulted in the loss of two frames of SSR data. See DR #108795 for more information. * On day 115 (Apr 25), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 1525z for 0.8 hours. The primary cause was the shortage of track time on day 114 (Wednesday). * On day 115 (Apr 25), the 56th momentum dump was executed successfully on Ahead at 1930Z, which imparted a delta V of 0.088 m/sec. * On day 114 (Apr 24), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1734z and again at 1735z. This anomaly resulted in the loss of two frames of SSR data. See DR #N108788 for more information. * On day 117 (Apr 27), during the DSS-15 support for Behind, turbo decoder lock was lost briefly at 1621z and again at 118-0007z. This anomaly resulted in the loss of 127 frames of SSR data. See DR #108796 for more information. * The average daily SSR playback volume during the week was 4.5 gigabits for Ahead, and 4.0 gigabits for Behind. Week 18 (Apr 29-May 5) * SECCHI-Behind had a watchdog reset late yesterday afternoon (Apr 29). See announcements above for details. * The nominal telemetry rate for the Ahead spacecraft with the 34 meter stations will be switched to 120 kbps on day 125 (May 5). IMPACT and PLASTIC report that they are already operating at the 120 kbps rate. SWAVES will need to command their rate down to match the Behind rate. * The 51st momentum dump for the Behind spacecraft is scheduled for May 1, with ignition at 17:00 UT. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 29 (D14 at 720 kbps), Tuesday, Apr 30 (D14 at 720 kbps), Thursday, May 2 (D63), and Saturday, May 4 (D14 at 720 kbps). The station 26 pass on Friday, May 3, will be carried out at 240 kbps. The following passes will be carried out at 160 kbps: Wednesday, May 1 (D55), Thursday, May 2 (D15), Saturday, May 4 (D55), and Sunday, May 5 (D65). * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 29 (D63, D14), Tuesday, Apr 30 (D14 at 720 kbps), Friday, May 3 (D14, D63 at 720 kbps), and Saturday, May 4 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, May 2 (D65), and Saturday, May 4 (D55). Week 19 (May 6-12) * Ahead has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 6 (D14), Tuesday, May 7 (D14 at 720 kbps), and Friday, May 10 (D14). The following passes will be carried out at 160 kbps: Wednesday, May 8 (D25), Thursday, May 9 (D55), and Sunday, May 12 (D55, D26). An ESA New Norcia pass is scheduled for Thursday, May 9. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Thursday, May 9 (D63 at 720 kbps), Friday, May 10 (D14 at 720 kbps), and Sunday, May 12 (D14 at 720 kbps). The station 25 pass on Thursday, May 9, will be carried out at 160 kbps, and the station 26 pass on Saturday, May 11, will be carried out at 240 kbps. Week 20 (May 13-19) * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 13 (D14), Wednesday, May 15 (D63), Friday, May 17 (D63), and Saturday, May 18 (D63). * Behind has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, May 14 (D14), Thursday, May 16 (D63), and Saturday, May 18 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Friday, May 17 (D25), and Sunday, May 19 (D54). Week 21 (May 20-26) * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, May 21 (D63), Friday, May 24 (D63 at 720 kbps), and Sunday, May 26 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, May 20 (D54), Tuesday, May 21 (D26), and Saturday, May 25 (D26, D54). An ESA New Norcia pass is scheduled for Thursday, May 23. * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Friday, May 24 (D63 at 720 kbps), and Sunday, May 26 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Wednesday, May 22 (D26, D65), and Saturday, May 25 (D26). Week 22 (May 27-Jun 2) * Monday, May 27, is Memorial Day, which is a holiday at APL. * Thursday, May 30, is the 57th Ahead momentum dump at 16:30 UT. * Wednesday, May 29 is a return-to-service track for station D43. There will be no SSR playback or instrument commanding. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 27 (D14), Tuesday, May 28 (D63 at 720 kbps), Wednesday, May 29 (D63), Friday, May 31 (D63), and Sunday, Jun 2 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Saturday, Jun 1 (D54). * Behind has 7 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 27 (D14 at 720 kbps), Tuesday, May 28 (D63 at 720 kbps), Friday, May 31 (D63 at 720 kbps), and Sunday, Jun 2 (D14 at 720 kbps). The following passes will be carried out at 240 kbps: Wednesday, May 29 (D26), and Saturday, Jun 1 (D26). Week 23 (Jun 3-9) * An engineering demo using station 26 with the STEREO Behind spacecraft will take place on Tuesday, Jun 4. No SSR playback or commanding will be available during this test. The test will use the new X-band and K-band attenuators to look at the strong spaceweather beacon signal. The SSC expressed interest in receiving the realtime spaceweather beacon data, but does not wish to impose additional requirements on the test. This may be possible now that the beacon data are Turbo encoded. DSN would like to schedule additional testing. * Wednesday, Jun 5, is the 52nd Behind momentum dump at 18:30 UT. * Ahead has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 3 (D63), Tuesday, Jun 4 (D14), Friday, Jun 7 (D63), and Saturday, Jun 8 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Wednesday, Jun 5 (D25) and Sunday, Jun 9 (D15). An ESA New Norcia pass is scheduled for Wednesday, Jun 5. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 27 (D14 at 720 kbps) and Friday, Jun 7 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Saturday, Jun 8 (D54), and Sunday, Jun 9 (D54). An ESA Malargue pass is scheduled for Tueday, Jun 4, and an ESA New Norcia pass is scheduled for Friday, Jun 7. Week 24 (Jun 10-16) * Tuesday, Jun 11, is the 26th Ahead SECCHI stepped calibration roll at 08:35 UT. * Behind will be at perihelion on Saturday, Jun 15. * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Jun 11 (D43), Thursday, Jun 13 (D43), Friday, Jun 14 (D63 at 720 kbps), and Saturday, Jun 15 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Jun 10 (D26, D15) and Tuesday, Jun 11 (D26). * Behind has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Jun 11 (D63 at 720 kbps), Thursday, Jun 13 (D43), Friday, Jun 14, (D43, D63), and Saturday, Jun 15 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Jun 10 (D15), Thursday Jun 13 (D25), and Sunday, Jun 16 (D15). The following passes will be carried out at 240 kbps: Monday, Jun 10 (D26). COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 18: M Apr 29 (119) Behind: SECCHI watchdog reset, 21:33-01:04 next day T Apr 30 (120) W May 01 (121) Behind: Momentum dump, 17:00 UT T May 02 (122) F May 03 (123) S May 04 (124) Ahead: Switch downlink rate to 120 kbps S May 05 (125) Notes: * Passage of Comet Lemmon through HI2-A, Apr 17-May 17 ------------------------------------------------------------------------------- Scheduled activities for Week 19: M May 06 (126) T May 07 (127) W May 08 (128) T May 09 (129) F May 10 (130) S May 11 (131) S May 12 (132) Notes: * Passage of Comet Lemmon through HI2-A, Apr 17-May 17 ------------------------------------------------------------------------------- Scheduled activities for Week 20: M May 13 (133) T May 14 (134) W May 15 (135) T May 16 (136) F May 17 (137) S May 18 (138) S May 19 (139) Notes: * Passage of Comet Lemmon through HI2-A, Apr 17-May 17 ------------------------------------------------------------------------------- Scheduled activities for Week 21: M May 20 (140) T May 21 (141) W May 22 (142) T May 23 (143) F May 24 (144) S May 25 (145) S May 26 (146) ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 27 (147) Memorial Day T May 28 (148) W May 29 (149) Ahead: Return-to-service track for D43 T May 30 (150) Ahead: Momentum dump, 16:30 UT F May 31 (151) S Jun 01 (152) S Jun 02 (153) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 03 (154) T Jun 04 (155) Behind: Engineering demo with station 26 W Jun 05 (156) Behind: Momentum dump, 18:30 UT T Jun 06 (157) 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) Ahead: SECCHI stepped calibration roll, 08:35 UT W Jun 12 (163) T Jun 13 (164) F Jun 14 (165) S Jun 15 (166) Behind: Perihelion S Jun 16 (167) ------------------------------------------------------------------------------- Upcoming events: 2013: * Nov 28 Both: Perihelion passage of Comet ISON http://stereo-ssc.nascom.nasa.gov/comet_ison/ * 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 * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet * Oct 17 Behind: Comet Siding Spring encounter with Mars 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