STEREO Weekly Meeting Minutes for 2012-11-20 (Week 47) ANNOUNCEMENTS ------------- * Significant coverage shortfalls for the Behind spacecraft are expected starting during week 46 and continuing through the end of the year. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 46 (Nov 12-18) * On day 319 (Nov 14), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0650z. This anomaly resulted in the loss of two frames of SSR data. See DR# N108532 for more information. * On day 320 (Nov 15), during the DSS-26 support for Ahead, the command bind was lost for one minute at 1347z. See DR# G113385 for more information. * On day 322 (Nov 17), during the DSS-65 support for Ahead, turbo decoder lock was lost intermittently beginning at 0615z through 0952z due to heavy rain. This anomaly resulted in the loss of several minutes (18393 frames) of SSR data. See DR# M107000 for more information. * On day 323 (Nov 18), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0728z. This anomaly resulted in the loss of one frame of SSR data. See DR# N108535 for more information. * On day 322 (Nov 17), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0051z for 6.5 hours. IMPACT (Part 15) reached 95% full at 0451z for 2.5 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 317 (Nov 12), during the DSS-62 (Cebreros) support for Behind, turbo decoder lock was lost intermittently beginning at 1355z through 1358z. This anomaly resulted in the loss of 40 frames SSR data. This anomaly is being investigated with ESA. * On day 320 (Nov 15), during the DSS-63 support for Behind, initial telemetry lock was established late at 1609z due to a Receiver and Ranging Processor (RRP) problem. A second RRP was placed online to correct the problem. This anomaly resulted in the loss of several minutes of SSR data. See DR# M106997 for more information * On day 323 (Nov 18), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1351z. This anomaly resulted in the loss of 29 frames of SSR data. DR# requested for more information. * On day 318 (Nov 13), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1828z for 0.03 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 319 (Nov 14), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1617z for 3 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 320 (Nov 15), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0421z for 12.2 hours. SWAVES (Part 13) reached 100% full at 2012z for 3.8 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 321 (Nov 16), the SSR science partitions on Behind filled as follows: SWAVES(Part 13) remained 100% full at 0000z for 15.7 hours. SWAVES(Part 13) reached 100% full at 1956z for 4.1 hours. IMPACT(Part 15) reached 95% full at 0347z for 12.2 hours. IMPACT (Part 15) reached 95% full at 1947z for 4.2 hours. PLASTIC(Part 17) reached 95% full at 1415z for 1.5 hours. PLASTIC(Part 17) reached 95% full at 2017z for 3.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 322 (Nov 17), the SSR science partitions on Behind filled as follows: SWAVES(Part 13) remained 100% full at 0000z for 0.9 hours. SWAVES(Part 13) reached 100% full at 0302z for 15.5 hours. IMPACT(Part 15) remained 95% full at 0000z for 0.8 hours. IMPACT(Part 15) reached 95% full at 0256z for 15.5 hours. PLASTIC(Part 17)remained 95% full at 0000z for 0.8 hours. PLASTIC(Part 17) reached 95% full at 0312z for 15.3 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 323 (Nov 18), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1208z for 1.5 hours. The primary cause was the accumulated shortage of track time throughout the week. * The average daily SSR playback volume during the week was 4.4 gigabits for Ahead, and 3.0 gigabits for Behind. * It is believed that the larger amount of SWAVES data lost during the week is due to the instrument still producing at the old rate. Week 47 (Nov 19-25) * Thursday, Nov 22 is Thanksgiving. Both Thursday and Friday, Nov 22-23, are holidays at APL. * Ahead has 15 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Nov 19, Wednesday, Nov 21, and Thursday, Nov 22, all using station 14. * Behind has 11 passes during the week, and coverage is short 11.3 hours. This is an improvement over the previous 18.2 hour shortage. The shortage covers days 326-330 (Wednesday-Sunday, Nov 21-25). 70 meter passes are scheduled for Monday, Nov 19, Tuesday, Nov 20, and Saturday, Nov 24, all using station 63. The station 26 pass on Saturday, Nov 24, will be carried out at 160 kbps. Week 48 (Nov 26-Dec 2) * Behind reaches aphelion on day 337 (Dec 2). * Upgrades to the MOC DMZ are scheduled for Wednesday, Nov 28, from 23:00 to 02:00 UT. This will require restarting the relay streams. * Ahead has 13 passes during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Nov 26 (D63), Tuesday, Nov 27 (D63), Thursday, Nov 29 (D14), and Saturday, Dec 1 (D63 at 720 kbps, D14). The station 26 pass on Wednesday, Nov 28, will be carried out at 240 kbps. * Behind has 10 passes during the week, and overall coverage is short 11.4 hours. This coverage mainly affects days 333-336 (Nov 28-Dec 1). There are 70 meter passes on Monday, Nov 26, Tuesday, Nov 27, Friday, Nov 30, and Sunday, Dec 2, all using station 63. An ESA Cebreros pass is scheduled for Saturday, Dec 1. Week 49 (Dec 3-9) * The 52nd momentum dump on Ahead is scheduled for Thursday, Dec 6, with ignition at 16:45 UT. * The 23rd SECCHI stepped calibration roll on Behind is scheduled for Tuesday, Dec 4, starting at 08:15 UT. This is the aphelion roll. * The second annual battery discharge on Behind is scheduled for Tuesday, Dec 4, starting at 13:00 UT, during the station 63 pass. * Additional upgrades to the MOC DMZ are scheduled for Wednesday, Dec 5, from 23:20 to 02:20 UT. * Ahead has 14 passes during the week, and overall coverage is nominal. There are 70 meter passes on Thursday, Dec 6 (D14), and Saturday, Dec 8 (D63). The station 26 passes on Thursday, Dec 6, and Sunday, Dec 9, will both be carried out at 240 kbps. * Behind has 11 passes during the week, and overall coverage in nominal. There are 70 meter passes scheduled for Tuesday, Dec 4 (D63), Wednesday, Dec 5 (D63), Thursday, Dec 6 (D63), and Saturday, Dec 8 (D14 at 720 kbps). The station 45 pass on Friday, Dec 7, will be carried out at 160 kbps. Week 50 (Dec 10-16) * Ahead has 15 passes during the week, and overall coverage is short 12 hours, affecting the period from Tuesday to Sunday, Dec 11-16. No 70 meter stations are scheduled during the week. Station 26 passes on Monday, Dec 10, Thursday, Dec 13, and Saturday, Dec 15, will all be carried out at 240 kbps. ESA New Norcia passes are scheduled for Monday, Dec 10, Wednesday, Dec 12, Friday, Dec 14, and Saturday, Dec 15. * Behind has 11 passes during the week, and overall coverage is short 19.8 hours, affecting the period from Wednesday to Sunday, Dec 12-16. There are 70 meter passes on Monday, Dec 10 (D63), and Saturday, Dec 15 (D14). ESA New Norcia passes are scheduled for Monday, Dec 10, Wednesday, Dec 12, and Friday, Dec 14, and an ESA Cebreros pass is scheduled for Sunday, Dec 16. The station 26 passed on Wednesday and Thursday, Dec 13-14, and the station 45 pass on Sunday, Dec 16, will all be carried out at 160 kbps. Week 51 (Dec 17-23) * The 24th SECCHI stepped calibration roll on Ahead is scheduled for Tuesday, Dec 18, starting at 10:15 UT. This is the midpoint roll. * The 47th momentum dump on Behind is scheduled for Thursday, Dec 20, starting at 21:00 UT. * Ahead has 14 passes during the week, and overall coverage is short 9.4 hours, mainly affecting days 352-356 (Dec 17-21). There are 70 meter passes on Friday, Dec 21, and Sunday, Dec 23, both using station 14. The station 26 passes on Wednesday, Dec 19, and Saturday, Dec 22, will both be carried out at 240 kbps. ESA New Norcia passes are scheduled for Wednesday, Dec 19, and Friday, Dec 21. * Behind has 10 passes during the week, and overall coverage is short 11.5 hours, affecting the period from Tuesday to Thursday, Dec 18-20. There are 70 meter passes scheduled for Monday, Dec 17 (D14 at 720 kbps), Friday, Dec 21 (D63), and Saturday, Dec 22 (D14). The station 26 pass on Thursday, Dec 20, will be carried out at 160 kbps. An ESA Cebreros pass is scheduled for Thursday, Dec 20, and an ESA New Norcia pass is scheduled for Friday, Dec 21. Week 52 (Dec 24-30) * The MOC will be closed for the Christmas holiday Monday and Tuesday, Dec 24-25. * Ahead has 12 passes during the week, and overall coverage is short 13.7 hours, mainly affecting days 361-365 (Dec 26-30). The station 26 pass on Thursday, Dec 27, will be carried out at 240 kbps. * Behind has 9 passes during the week, and overall coverage is short 10.25 hours, mainly affecting days 361-363 (Dec 26-28). There are 70 meter passes on Monday, Dec 24 (D14), Tuesday, Dec 25 (D63), Thursday, Dec 27 (D63), and Saturday, Dec 29 (D63). Week 01 (Dec 31-Jan 6) * The MOC will be closed for the New Year holiday Monday, Dec 31, and Tuesday, Jan 1. * Ahead has 10 passes during the week, and overall coverage is short 25.2 hours. The station 65 pass on Monday, Dec 31, and the station 26 pass on Thursday, Jan 3, will be carried out at 240 kbps. * Behind has 8 passes during the week, and overall coverage is short 20.5 hours. There are 70 meter passes on Wednesday, Jan 2, and Saturday, Jan 5, both using station 63. The station 26 pass on Friday, Jan 4, will be carried out at 160 kbps. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 47: M Nov 19 (324) T Nov 20 (325) W Nov 21 (326) T Nov 22 (327) Thanksgiving F Nov 23 (328) S Nov 24 (329) S Nov 25 (330) Notes: * Significant telemetry shortfalls for Behind are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 48: M Nov 26 (331) T Nov 27 (332) W Nov 28 (333) T Nov 29 (334) F Nov 30 (335) S Dec 01 (336) S Dec 02 (337) Notes: * Significant telemetry shortfalls for Behind are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 49: M Dec 03 (338) T Dec 04 (339) Behind: SECCHI stepped calibration roll, 08:15 UT W Dec 05 (340) T Dec 06 (341) Ahead: Momentum dump, 16:45 UT F Dec 07 (342) S Dec 08 (343) S Dec 09 (344) ------------------------------------------------------------------------------- Scheduled activities for Week 50: M Dec 10 (345) T Dec 11 (346) W Dec 12 (347) T Dec 13 (348) F Dec 14 (349) S Dec 15 (350) S Dec 16 (351) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 51: M Dec 17 (352) T Dec 18 (353) Ahead: SECCHI stepped calibration roll, 10:15 UT W Dec 19 (354) T Dec 20 (355) Behind: Momentum dump, 21:00 UT F Dec 21 (356) S Dec 22 (357) S Dec 23 (358) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 52: M Dec 24 (359) T Dec 25 (360) Christmas W Dec 26 (361) T Dec 27 (362) F Dec 28 (363) S Dec 29 (364) S Dec 30 (365) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Dec 31 (366) T Jan 01 (001) New Year W Jan 02 (002) T Jan 03 (003) F Jan 04 (004) S Jan 05 (005) S Jan 06 (006) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Upcoming events: 2013: * May 3 Ahead: Switch downlink rate to 120 kbps * 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 * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet 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