STEREO Weekly Meeting Minutes for 2013-04-23 (Week 17) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * On day 105 (Apr 15), the SECCHI instrument for Ahead reset at 04:45:53z. The SECCHI team reconfigured the instrument to operational mode at 1725z. This was the 29th reset of SECCHI on the Ahead spacecraft. * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 16 (Apr 15-21) * On day 105 (Apr 15), during the DSS-25 support for Ahead, turbo decoder lock was lost intermittently beginning at 1443z through 2204z due to high winds at the Goldstone complex. At 2205z, the high winds caused DSS-25 to stow the antenna for the remainder of the track. This anomaly resulted in the loss of 1689 frames of SSR data during the intermittently decoder lock losses and the loss of twenty minutes of SSR data during the antenna stowing. See DRs #G113855 and # G113861 for more information. * On day 106 (Apr 16), during the DSS 55 support for Ahead, turbo decoder lock was lost intermittently beginning at 0705z through 0905z. This anomaly resulted in the loss of 15 frames of SSR data. See DR #N108759 for more information. * On day 106 (Apr 16), during the DSS-24 support for Behind, turbo decoder lock was lost briefly at 107-0045z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108762 for more information. * On day 107 (Apr 17), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0707z. This anomaly resulted in the loss of two frames of SSR data. See DR #N108763 for more information. * On day 107 (Apr 17), during the DSS-54 support for Behind, turbo decoder lock was lost intermittently beginning at 1757z through 1808z. This anomaly resulted in the loss of seven frames of SSR data. See DR #N108770 for more information. * On day 108 (Apr 18), during the DSS-54 support for Behind, turbo decoder lock was lost briefly at 1841z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108771 for more information. * On day 109 (Apr 19), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0800z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108773 for more information. * On day 110 (Apr 20), during the DSS-25 support for Ahead, turbo decoder lock was lost briefly at 1921z. This anomaly resulted in the loss of two frames of SSR data. See DR #108775 for more information. * On day 110 (Apr 20), during the DSS-54 support for Behind, turbo decoder lock was lost briefly at 1142z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108774 for more information. * On day 111 (Apr 21), during the DSS-45 support for Ahead, turbo decoder lock was lost briefly at 1946z and intermittently beginning at 2335z through 2337z. This anomaly resulted in the loss of 21 frames of SSR data. See DR #108776 for more information. * The average daily SSR playback volume during the week was 4.6 gigabits for Ahead, and 4.1 gigabits for Behind. Week 17 (Apr 22-28) * The 56th momentum dump on Ahead will be carried out on Thursday, Apr 25, with ignition at 19:30 UT. * Ahead has 10 tracks during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Friday, Apr 26 (D14 at 720 kbps). The station 26 pass on Thursday, Apr 25, will be carried out at 360 kbps. The following passes will be carried out at 240 kbps: Monday, Apr 22 (D26), Saturday, Apr 23 (D55), and Sunday, Apr 27 (D55). * DSN comments that station 14 is currently experiencing a loss of 1.2 dB for elevations below 20 degrees. The Ahead pass will be at 25 degrees at BOT. * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Apr 23 (D14), and Wednesday, Apr 24 (D63 at 720 kbps). The station 26 pass on Sunday, Apr 28, will be carried out at 240 kbps. The following passes will be carried out at 160 kbps: Tuesday, Apr 23 (D15), Thursday, Apr 25 (D65), and Saturday, Apr 27 (D15). Week 18 (Apr 29-May 5) * The nominal telemetry rate for the Ahead spacecraft with the 34 meter stations will be switched to 120 kbps on day 125 (May 5). * 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, and the station 55 pass on Wednesday, May 1 and Saturday, May 4, will be carried out at 160 kbps. * 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). Station ids will be changing - station 32 to 74 and station 62 to 83 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 10 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-June 2) * Monday, May 27 is Memorial Day. * 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, June 2 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Saturday, June 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, June 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 (June 3-June 9) * Wednesday, June 5 is the 52th Behind momentum dump at 15:00 UT. * Ahead has 8 passes during the week, and overall coverage is short 5 hours. 70 meter passes are scheduled for Monday, June 3 (D63), Tuesday, June 4 (D14), Friday, June 7 (D63), and Saturday, June 8 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Wednesday, June 5 (D25) and Sunday, June 9 (D15). * Behind has 7 passes during the week, and overall coverage is short 10.8 hours. 70 meter passes are scheduled for Monday, May 27 (D14 at 720 kbps) and Friday, June 7 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Saturday, June 8 (D54), and Sunday, Jun 9 (D54). Week 24 (June 10-June 16) * Tuesday, June 11 is the 26th Ahead SECCHI step calibration at 08:35 UT. * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, June 11 (D43), Thursday, June 13 (D43), Friday, June 14 (D63 at 720 kbps), and Saturday, June 15 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, June 10 (D15, D26) and Tuesday June 11 (D26). * Behind has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Thursday, June 13 (D43), Friday, June 14, (D43 and D63), and Saturday, June 15 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, June 10 (D15) and Thursday June 13 (D25) and Sunday, June 16 (D15). The following passes will be carried out at 240 kbps: Monday, June 10 (D15). COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 15 (105) T Apr 16 (106) W Apr 17 (107) T Apr 18 (108) F Apr 19 (109) S Apr 20 (110) S Apr 21 (111) Notes: * Passage of Comet Lemmon through HI2-A, Apr 17-May 17 ------------------------------------------------------------------------------- Scheduled activities for Week 17: M Apr 22 (112) T Apr 23 (113) W Apr 24 (114) T Apr 25 (115) Ahead: Momentum dump, 19:30 UT F Apr 26 (116) S Apr 27 (117) S Apr 28 (118) Notes: * Passage of Comet Lemmon through HI2-A, Apr 17-May 17 ------------------------------------------------------------------------------- Scheduled activities for Week 18: M Apr 29 (119) 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) W Jun 05 (156) Behind: Momentum dump, 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 26th Step Calibration 08:35 UT W Jun 12 (163) T Jun 13 (164) F Jun 14 (165) S Jun 15 (166) Behind reaches perhelion 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