STEREO Weekly Meeting Minutes for 2013-04-16 (Week 16) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 15 (Apr 8-14) * On day 100 (Apr 10), during the DSS-65 support for Ahead, turbo decoder lock was lost briefly at 1336z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108745 for more information. * On day 101 (Apr 11), during the DSS 55 support for Ahead, turbo decoder lock was lost briefly at 1048z. This anomaly resulted in the loss of eight frames of SSR data. See DR #N108747 for more information. * On day 099 (Apr 9), during the DSS-65 support for Behind, turbo decoder lock was lost intermittently beginning at 1731z through 1744z. This anomaly resulted in the loss of 327 frames of SSR data. See DR #N108739 for more information. * On day 101 (Apr 11), during the DSS 55 support for Behind, turbo decoder lock was lost briefly at 1543z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108748 for more information. * On day 102 (Apr 12), during the DSS-25 support for Behind, telemetry was received seven minutes late at 0122z due to Goldstone supporting the DIF spacecraft emergency. This anomaly resulted in the loss of seven minutes of SSR data. See DR #G113842 for more information. * On day 102 (Apr 12), during the DSS 14 support for Behind, turbo decoder lock was lost intermittently beginning at 2331z through 2340z. This anomaly resulted in the loss of 7411 frames of SSR data. See DR #N108757 for more information. * On day 103 (Apr 13), the Behind spacecraft autonomy rule #11 (Enforce Reaction Wheel #1 power ON) fired at 19:40:44z. A review of telemetry indicates that Reaction Wheel #1 power was offline for nine seconds when the fault protection system detected the problem and restored power. This resulted in a brief pointing error of several arcminutes which affected the SECCHI EUVI and COR1 instrument data. There was no other interruption to science data and all SSR data was received in the MOC. The root cause of the anomaly is still unknown and the engineer team is actively investigating. * The average daily SSR playback volume during the week was 4.5 gigabits for Ahead, and 4.4 gigabits for Behind. Week 16 (Apr 15-21) * The 29th SECCHI watchdog reset on Ahead occurred yesterday (Apr 15). It was recovered on the following pass. * High winds at the Goldstone station caused intermittent loss of telemetry lock during the Ahead pass, ending with the antenna being stowed 20 minutes before the end of the pass. * Ahead has 10 tracks during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Friday, Apr 19, using station 63. The following passes will all be carried out at 240 kbps: Monday, Apr 15 (D25), Tuesday, Apr 15 (D55), Friday, Apr 19 (D26), Saturday, Apr 20 (D25), and Sunday, Apr 21 (D65, D15). * Behind has 11 tracks during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Monday, Apr 15, using station 63 at 720 kbps. The station 26 pass on Friday, Apr 19, will be carried out at 240 kbps. The following passes will all be carried out at 160 kbps: Tuesday, Apr 16 (D24), Saturday, Apr 20 (D54, D15), and Sunday, Apr 21 (D54, D25). 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 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). * 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 16:30z. * 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 Saturday, June 1 (D26 at 240 kbps). The following passes will be carried out at 240 kbps: Wednesday, May 29 (D26), and Saturday, Jun 1 (D26). 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) ------------------------------------------------------------------------------- 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