STEREO Weekly Meeting Minutes for 2013-03-12 (Week 11) ANNOUNCEMENTS ------------- * On Tuesday, March 12th, at 3 PM and possibly through 10 AM on Wednesday, March 13th, connectivity to the STEREO MOC will be unavailable due to a RAID replacement upgrade on the instrument team external MOC workstations. This time frame is outside of schedule tracks, so receipt of real-time telemetry will not be impacted. Instrument teams will not be able to send commands to the MOC during this maintenance period. After the maintenance has been completed, a notification will be sent to advise instrument teams that they can reconnect to the STEREO MOC. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 10 (Mar 4-10) * On day 063 (Mar 4), during the DSS-26 support for Ahead, turbo decoder lock was lost briefly at 1946z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108647 for more information. * On day 064 (Mar 5), after the MOC performed an SLE telemetry rebind for a connectivity issue, the STEREO AHEAD MOC successfully conducted the first operational support with ESA DSS-84 (Malargue, Argentina). * On day 065 (Mar 6), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0711z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108650 for more information. * On day 066 (Mar 7), during the DSS-55 support for Ahead, turbo decoder lock was lost intermittently beginning at 0655z (BOT) through 0704z. This anomaly resulted in the loss of 4109 frames of SSR data. See DR #N108649 for more information. * On day 067 (Mar 8), during the DSS 14 support for Ahead, initial telemetry lock and commanding were established 2.2 hours late at 1913z due to heavy snow at Goldstone. SSR pointers were repositioned to recover data, however the SWAVES SSR partition was 100% full at the beginning of track and on-board autonomy fired to free SSR space before the pointer reposition commands were received. The anomaly resulted in the loss of approximately four hours of SSR data for all instruments. See DR #G113762 for more information. * On day 069 (Mar 10), during the DSS-63 support for Ahead, turbo decoder lock was lost intermittently beginning at 0755z through 0924z. This anomaly resulted in the loss of 192 frames of SSR data. See DR #N108655 for more information. * On day 069 (Mar 10), during the DSS-45 support for Ahead, no commanding or ranging for the entire track due the transmitter being declared red prior to the support. See DR# C109277 for more information. * On day 067 (Mar 8), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 1624z for 1.2 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 063 (Mar 4), during the DSS-65 support for Behind, turbo decoder lock was lost intermittently beginning at 1420z through 1658z due to heavy rain. Telemetry was lost completely from 1659z through 1724z. This anomaly resulted in the loss of more than 25 minutes (37177 frames) of SSR data. See DR #M107133 for more information. * On day 066 (Mar 7), during the DSS-63 support for Behind, turbo decoder lock was lost intermittently beginning at 1716z through 1728z due to heavy rain. This anomaly resulted in the loss of several minutes (30649 frames) of SSR data. See DR #M107143 for more information. * On day 067 (Mar 8), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1219z and again at 1332z. This anomaly resulted in the loss of 30 frames of SSR data. See DR #N108651 for more information. * On day 068 (Mar 9), during the DSS-65 support for Behind, turbo decoder lock was lost intermittently beginning at 1256z through 1502z. This anomaly resulted in the loss of 14 frames of SSR data. See DR #N108653 for more information. * On day 068 (Mar 9), after ESA corrected the downlink rate to 160Kbps (D/L rate was increased from 120Kbps for data return), the STEREO BEHIND MOC successfully conducted the first operational support with ESA DSS-84 (Malargue, Argentina). * On day 069 (Mar 10), during the DSS-63 support for Behind, turbo decoder lock was lost intermittently beginning at 1345z through 1348z. This anomaly resulted in the loss of 506 frames of SSR data. See DR #N108654 for more information. * The average daily SSR playback volume during the week was 4.1 gigabits for Ahead, and 4.3 gigabits for Behind. Week 11 (Mar 11-17) * Some frames were dropped during this morning's (Mar 12) station 63 pass for Ahead. * Ahead reaches perihelion on Sunday, Mar 17. * The 24th SECCHI stepped calibration roll was carried out on Behind this morning (Mar 12). All indications so far are that the roll was successful. * Connectivity to the STEREO MOC will be down Tuesday evening to Wednesday morning, Mar 12-13. See announcement above for details. * Additional testing of the space weather turbo mode will be carried out starting at 16:00 UT on Mar 14, through 13:25 UT on Mar 15. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Mar 11 (D14), Tuesday, Mar 12 (D63 at 720 kbps), Friday, Mar 15 (D63 at 720 kbps), and Saturday, Mar 16 (D63). The station 26 passes on Wednesday and Thursday, Mar 13-14, will be carried out at 240 kbps. * Behind has 7 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Mar 12 (D63 at 720 kbps), Wednesday, Mar 13 (D63), and Friday, Mar 15 (D63 at 720 kbps). The station 65 pass on Thursday, Mar 14, will be carried out at 160 kbps, and the station 26 pass on Saturday, Mar 16, will be carried out at 240 kbps. Week 12 (Mar 18-24) * The 25th SECCHI stepped calibration roll will be carried out on Ahead on Tuesday, Mar 19, starting at 10:10 UT. This will be the perihelion roll. System momentum is expected to be about 6 N-m-s. * The 55th momentum dump on Ahead will be carried out on Thursday, Mar 21, starting at 18:00 UT. * Ahead has 11 passes during the week, and overall coverage is short 2.1 hours, mainly between Wednesday-Thursday Mar 20-21. 70 meter passes are scheduled for Wednesday, Mar 20 (D14), Saturday, Mar 23 (D14 at 720 kbps), and Sunday, Mar 24 (D63 at 720 kbps). The station 26 pass on Thursday, Mar 21, will be carried out at 240 kbps. ESA New Norcia passes are scheduled each day between Monday and Wednesday, Mar 18-20. * Behind has 15 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Mar 19, Wednesday, Mar 20, Saturday, Mar 23, and Sunday, Mar 24, all using station 63. The station 26 passes on Monday, Mar 18, and Thursday, Mar 21, will be carried out at 160 kbps. ESA New Norcia passes are scheduled for Tuesday-Friday, Mar 19-22, and an ESA Cebreros pass is scheduled for Saturday, Mar 23. Week 13 (Mar 25-31) * The 50th momentum dump on Behind will be carried out on Thursday, Mar 28, starting at 16:30 UT. * Ahead has 13 passes during the week, and overall coverage is short 3.24 hours. 70 meter passes are scheduled for Monday, Mar 25 (D14), Thursday, Mar 28 (D14), Saturday, Mar 30 (D63 at 720 kbps), and Sunday, Mar 31 (D63 at 720 kbps). The station 34 pass on Thursday, Mar 28, the station 26 pass on Friday, Mar 29, and the station 15 pass on Sunday, Mar 31, will all be carried out at 240 kbps. ESA New Norcia passes are scheduled for Monday and Tuesday, Mar 25-26. * Behind has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Mar 25 (D14 at 720 kbps), Tuesday, Mar 26 (D14), Thursday, Mar 28 (D63 at 720 kbps), Saturday, Mar 30 (D63), and Sunday, Mar 31 (D63). The station 24 pass on Wednesday, Mar 27, and the station 26 pass on Friday, Mar 29, will both be carried out at 160 kbps. Week 14 (Apr 1-7) * A return-to-service track for station 54 using Ahead is scheduled for Thursday, Apr 4. No SSR playback or instrument commanding will be available during this track. * Ahead has 13 tracks during the week, and overall coverage is short 5 hours, mainly Monday-Wednesday, Apr 1-3. 70 meter tracks are scheduled for Monday, Apr 1 (D63 at 720 kbps), Tuesday, Apr 2 (D14), and Saturday, Apr 6 (D14). The station 26 track on Monday, Apr 1, will be carried out at 360 kbps. ESA New Norcia tracks are scheduled for Tuesday, Apr 2, and twice on Friday, Apr 5, and an ESA Cebreros track is scheduled for Thursday, Apr 4. * Behind has 11 tracks during the week, and overall coverage is nominal. There are 70 meter tracks scheduled for Monday, Apr 1 (D63), Tuesday, Apr 2 (D14), Wednesday, Apr 3 (D63), Friday, Apr 5 (D14, D63 twice), and Saturday, Apr 6 (D63). The station 26 pass on Thursday, Apr 4, will be carried out at 160 kbps. * The 70 meter track for Behind on Apr 1 was originally 720 kbps. This was changed to 480 kbps to increase coverage on Ahead. Week 15 (Apr 8-14) * Ahead has 9 tracks during the week, and overall coverage is nominal. 70 meter tracks are scheduled for Tuesday, Apr 9 (D63 at 720 kbps), and Friday, Apr 12 (D14 at 720 kbps). The station 34 pass on Wednesday, Apr 10, and the station 24 pass on Saturday, Apr 13, will both be carried out at 240 kbps. The station 26 pass on Sunday, Apr 14, will be carried out at 360 kbps. An ESA track is scheduled for Monday, Apr 8. * Behind has 13 tracks during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 8 (D14 at 720 kbps), and Friday, Apr 12 (D14). The station 55 passes on Wednesday and Thursday, Apr 10-11, the station 26 pass on Thursday, Apr 11, and the station 15 pass on Sunday, Apr 14, will all be carried out at 160 kbps. The station 26 pass on Saturday, Apr 13, will be carried out at 240 kbps. ESA tracks are scheduled for Tuesday and Wednesday, Apr 9-10. Week 16 (Apr 15-21) * 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 10 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 follwoing 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), and Sunday, Apr 27 (D55). * Behind has 10 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Apr 23, using station 14. 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). Other * The question was raised whether additional test tracks would be scheduled for the ESA Malarque station, or whether operational tracks should now be scheduled with Malargue. An agreement needs to be in place for the latter. * There will be an annual spacecraft subsystem review tomorrow at APL, from 9:30-12:00 EDT. Call-in information has been distributed to the teams. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 11 (070) T Mar 12 (071) Ahead: Station 54 shadow track Behind: SECCHI stepped calibration roll, 08:35 W Mar 13 (072) T Mar 14 (073) Behind: Space weather Turbo test, starting 16:00 UT F Mar 15 (074) Behind: Space weather Turbo test, ending 13:25 UT S Mar 16 (075) S Mar 17 (076) Notes: * STEREO MOC will be unavailable starting 3:00 PM EDT on Mar 12, and possibly through 10 AM EDT on Mar 13, due to maintenance. * Passage of Comet PanSTARRS through HI1-B, March 10-19 ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 18 (077) T Mar 19 (078) Ahead: SECCHI stepped calibration roll, 10:10 UT W Mar 20 (079) T Mar 21 (080) Ahead: Momentum dump, 18:00 UT F Mar 22 (081) Behind: Space weather Turbo test, 05:28-22:31 UT (TBC) S Mar 23 (082) S Mar 24 (083) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. * Passage of Comet PanSTARRS through HI1-B, March 10-19 ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 25 (084) T Mar 26 (085) W Mar 27 (086) T Mar 28 (087) Behind: Momentum dump, 16:30 UT F Mar 29 (088) S Mar 30 (089) S Mar 31 (090) Notes: * Significant telemetry shortfalls for the Ahead spacecraft are expected during the week ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Apr 01 (091) T Apr 02 (092) W Apr 03 (093) T Apr 04 (094) Ahead: Return-to-service track for station 54. F Apr 05 (095) S Apr 06 (096) S Apr 07 (097) Notes: * Significant telemetry shortfalls for the Ahead spacecraft are expected during the week ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 08 (098) T Apr 09 (099) W Apr 10 (100) T Apr 11 (101) F Apr 12 (102) S Apr 13 (103) S Apr 14 (104) ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- Upcoming events: 2013: * Apr 17-May 17 Passage of Comet Lemmon through HI2-A * May 3 Ahead: Switch downlink rate to 120 kbps * Nov 28 Both: Perihelion passage of 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