STEREO Weekly Meeting Minutes for 2013-06-11 (Week 24) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 23 (Jun 3-9) * On day 154 (Jun 3), during the DSS-63 support for Ahead, turbo decoder lock was lost intermittently beginning at 0521z through 0740z. This anomaly resulted in the loss of 1776 frames of SSR data. See DR #N108901 for more information. * On day 155 (Jun 4), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0539z and again at 0542z. This anomaly resulted in the loss of five frames of SSR data. See DR #N108907 for more information. * On day 157 (Jun 6), DSN performed the DSS-43 Return-To-Service (RTS) Engineering Demo. * On day 158 (Jun 7), during the DSS-63 support for Ahead, the receiver and ranging processor unexpectedly went out of lock beginning at 0631z through 0658z. Also during this track, turbo decoder lock was lost intermittently between 0703z-0812z. These anomalies resulted in the loss of 74428 frames of SSR data, affecting all four instruments. See DR #M107346 for more information. * The MOC noted that the station 63 performance seemed to be lower than usual the last few weeks. Specifically, the station has been dropping more frames. DSN will look into this, but this is believed to be related to ongoing issues which have been also seen by other missions. * On day 159 (Jun 8), during the DSS-14 support for Ahead, no telemetry for the entire track because the antenna was declared red at BOT due to an antenna cooling problem. During the next support with DSS-43 (RTS engineering demo), the SSR pointers were repositioned to minimize data loss. The anomaly resulted in the loss of two hours of SSR data for the SECCHI instrument. See DR #G113986 for more information. * On day 159 (Jun 8), DSN performed the DSS-43 Return-To-Service (RTS) Engineering Demo with Ahead. The end of track was extended to 1600330z to assist STEREO Ahead with recovering lost SSR data from the failed DSS-14 support. * On day 160 (Jun 9), DSN performed the DSS-43 Return-To-Service (RTS) Engineering Demo. DSN reports that everything looks good now with station 43. The ranging problem has been fixed, and the mirror problem reported last week appears to have been corrected with a reload of the software, and is currently being watched. * On day 155 (Jun 4), during the DSS-84 ESA support for Behind, telemetry and commanding was not available in the MOC from 1944z through 2001z due the SLE Binds aborting. The problem was with the JPL Matrix Switch controller, which required a reset. All SSR data were recovered via an SLE offline transfer. See DR #N108909 for more information. * On day 156 (Jun 5), during the DSS-65 support for Behind, turbo decoder lock was lost briefly at 1633z. This anomaly resulted in the loss of two frames of SSR data. See DR #N108921 for more information. * On day 157 (Jun 6), during the DSS-65 support for Behind, turbo decoder lock was lost briefly at 1816z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108922 for more information. * On day 158 (Jun 7), during the DSS-63 support for Behind, turbo decoder lock was lost intermittently beginning at 1548z through 1835z. This anomaly resulted in the loss of 54 frames of SSR data. See DR #N108932 for more information. * On day 159 (Jun 8), during the DSS-54 support for Behind, turbo decoder lock was lost briefly at 1809z. Also during this support, the SLE command bind was lost at 1633z until the MOC automation successfully recovered the bind at 1803z. The turbo decoder anomaly resulted in the loss of 16 frames of SSR data. See DRs #N108930 and #N108931 respectively for more information. * On day 158 (Jun 7), IMPACT conducted real-time commanding on Behind at 1608z for HET to set thresholds and disable stimulus event generation. * The average daily SSR playback volume during the week was 3.7 gigabits for Ahead, and 3.9 gigabits for Behind. Week 24 (Jun 10-16) * On day 162 (Jun 11), the 26th SECCHI stepped calibration was executed at 0835z for the midpoint in the orbit. * Behind will be at perihelion on Saturday, Jun 15. * Some frames were dropped during the station 63 pass for Behind this morning (Jun 11). * 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). Week 25 (Jun 17-23) * The 25th SECCHI stepped calibration roll on Behind will be carried out on Tuesday, Jun 18, starting at 17:00 UT. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 17 (D63), Thursday, Jun 20 (D14), and Saturday, Jun 22 (D63). The station 26 pass on Friday, Jun 21, will be carried out at 240 kbps. The following passes will be carried out at 160 kbps: Tuesday, Jun 18 (D26), Thursday, Jun 20 (D15), and Sunday, Jun 23 (D25). * Behind has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 17 (D14), Wednesday, Jun 19 (D63), Friday, Jun 21 (D63), and Saturday, Jun 22 (D63), all at 720 kbps. The station 54 pass on Sunday, Jun 23, will be carried out at 160 kbps. Week 26 (Jun 24-30) * On Wednesday, Jun 26, station 54 will be shadowing the Behind pass on station 55 to test a new antenna controller. * Ahead has 13 passes during the week, and overall coverage is short 5 hours, mainly on Wednesday, Jun 26. 70 meter passes are scheduled for Monday, Jun 24 (D14), Thursday, Jun 27 (D14, D43), Saturday, Jun 29 (D14 at 720 kbps), and Sunday, Jun 30 (D63 at 720 kbps, D43). The following passes will be carried out at 160 kbps: Tuesday, Jun 25 (D26), and Wednesday, Jun 26 (D65). An ESA New Norcia pass is scheduled for Tuesday, Jun 25. * Behind has 12 passes during the week, and overall coverage is short 7.2 hours, mainly on Wednesday and Thursday. 70 meter passes are scheduled for Tuesday, Jun 25 (D63 at 720 kbps), Friday, Jun 28 (D43, D63 at 720 kbps), Saturday, Jun 29 (D63 at 720 kbsp), and Sunday, Jun 30 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Wednesday, Jun 26 (D54), Thursday, Jun 27 (D26), and Saturday, Jun 29 (D26). Week 27 (Jul 1-7) * The 58th momentum dump is scheduled for Ahead on Jul 1, with ignition at 16:00 UT. * A return-to-service track for station 24 is scheduled with the Ahead spacecraft on Wednesday, Jul 3. There will be no SSR downlink or instrument commanding during this track. * Jul 4 is Independence Day, which is a holiday at APL. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Friday, Jul 5, and Sunday, Jul 7, both using station 63 at 720 kbps. The following passes will be carried out at 160 kbps: Monday, Jul 1 (D26), and Thursday, Jul 4 (D15). * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 1 (D43), Wednesday, Jul 3 (D63 at 720 kbps), Friday, Jul 5 (D14 at 720 kbps), Saturday, Jul 6 (D63 at 720 kbps), and Sunday, Jul 7 (D63 at 720 kbps). Week 28 (Jul 8-14) * Additional engineering demos using attenuators with the STEREO beacon broadcast on Behind are scheduled for Monday, Jul 8 (D24), and Tuesday, Jul 9 (D55). * The 18th HGA calibrations are scheduled for the Ahead spacecraft on Tuesday, Jul 9, at 17:00 UT, and for the Behind spacecraft on Wednesday, Jul 10, at 16:00 UT. * A return-to-service track for station 55 with the Ahead spacecraft is scheduled for Wednesday, Jul 10. There will be no SSR downlink or instrument commanding during this track. * The 53rd momentum dump on Behind is scheduled for Thursday, Jul 11, 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, Jul 8, Wednesday, Jul 10, Thursday, Jul 11, and Friday, Jul 12, all using station 14. The station 15 pass on Saturday, Jul 13, will be carried out at 160 kbps. * Behind has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 8, and Tuesday, Jul 9, both using station 63 at 720 kbps. The following passes will be carried out at 160 kbps: Saturday, Jul 13 (D65), and Sunday, Jul 14 (D24). Week 29 (Jul 15-21) * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 15 (D14), Wednesday, Jul 17 (D14), Thursday, Jul 18 (D43, D14), Friday, Jul 19 (D43), Saturday, Jul 20 (D14), and Sunday, Jul 21 (D14). * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 15 (D43), and Wednesday, Jul 17 (D43, D14 at 720 kbps). The following passes will be carried out at 160 kbps: Saturday, Jul 20 (D54, D24). Week 30 (Jul 22-28) * Ahead has 10 tracks during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Jul 23 (D14), Wednesday, Jul 24 (D43), Thursday, Jul 25 (D14), and Saturday, Jul 27 (D14 at 720 kbps). The station 26 pass on Sunday, Jul 28, will be carried out at 240 kbps. * Behind has 14 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Thursday, Jul 25 (D43 at 720 kbps). The station 26 pass on Saturday, Jul 27, will be carried out at 240 kbps. The following passes will be carried out at 160 kbps: Monday, Jul 22 (D26), Friday, Jul 26 (D26 twice), and Sunday, Jul 28 (D54). Week 31 (Jul 29-Aug 4) * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 29 (D14), Tuesday, Jul 30 (D14), Thursday, Aug 1 (D14), and Friday, Aug 2 (D14, D43). The following passes will be carried out at 160 kbps: Wednesday, Jul 31 (D54), and Saturday, Aug 3 (D54, D25). * Behind has 10 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Jul 30 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, Jul 30 (D55), and Sunday, Aug 4 (D55). Week 32 (Aug 5-11) * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Aug 6 (D14), Wednesday, Aug 7 (D14), and Sunday, Aug 11 (D63). The following passes will be carried out at 160 kbps: Thursday, Aug 8 (D54) and Saturday, Aug 10 (D45). * Behind has 11 passes during the week, and overall coverage is nominal 70 meter passes are scheduled for Thursday, Aug 8 (D14), and Sunday, Aug 11 (D63 at 720 kbps). The station 26 pass on Wednesday, Aug 7, will be carried out at 160 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 17 (168) T Jun 18 (169) Behind: SECCHI stepped calibration roll, 17:00 UT W Jun 19 (170) T Jun 20 (171) F Jun 21 (172) S Jun 22 (173) S Jun 23 (174) ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 24 (175) T Jun 25 (176) W Jun 26 (177) Behind: D54 shadow track during D55 pass T Jun 27 (178) F Jun 28 (179) S Jun 29 (180) S Jun 30 (181) Notes: * Significant telemetry shortages are expected during the week for both spacecraft. ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 01 (182) Ahead: Momentum dump, 16:00 UT T Jul 02 (183) W Jul 03 (184) Ahead: Return-to-service track for station 24 T Jul 04 (185) Independence Day F Jul 05 (186) S Jul 06 (187) S Jul 07 (188) ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 08 (189) Behind: Engineering demo with station 24 T Jul 09 (190) Ahead: HGA calibration, 17:00 Behind: Engineering demo with station 55 W Jul 10 (191) Ahead: Return-to-service track for station 55 Behind: HGA calibration, 16:00 T Jul 11 (192) Behind: Momentum dump, 17:00 F Jul 12 (193) S Jul 13 (194) S Jul 14 (195) ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 15 (196) T Jul 16 (197) W Jul 17 (198) T Jul 18 (199) F Jul 19 (200) S Jul 20 (201) S Jul 21 (202) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 22 (203) T Jul 23 (204) W Jul 24 (205) T Jul 25 (206) F Jul 26 (207) S Jul 27 (208) S Jul 28 (209) ------------------------------------------------------------------------------- Scheduled activities for Week 31: M Jul 29 (210) T Jul 30 (211) W Jul 31 (212) T Aug 01 (213) F Aug 02 (214) S Aug 03 (215) S Aug 04 (216) ------------------------------------------------------------------------------- Scheduled activities for Week 32: M Aug 05 (217) T Aug 06 (218) W Aug 07 (219) T Aug 08 (220) F Aug 09 (221) S Aug 10 (222) S Aug 11 (223) ------------------------------------------------------------------------------- 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