STEREO Weekly Meeting Minutes for 2012-12-04 (Week 49) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 48 (Nov 26-Dec 2) * On day 332 (Nov 27), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0717z. This anomaly resulted in the loss of three frames of SSR data. See DR #N108547 for more information. * On day 332 (Nov 27), during the DSS-15 support for Ahead, turbo decoder lock was lost briefly at 1348z and again at 1608z. This anomaly resulted in the loss of two frames of SSR data. See DR #N108548 for more information. * On day 333 (Nov 28), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0739z and again at 1051z. This anomaly resulted in the loss of five frames of SSR data. See DR #N108549 for more information. * On day 333 (Nov 28), during the DSS-34 support for Ahead, no commanding or ranging for the entire track due to a transmitter problem. Also during the support, turbo decoder lock was lost briefly at 2017z. This anomaly resulted in the loss of one frame of SSR data. See DRs# C109134 and N108550 for more information. * On day 336 (Dec 1), during the DSS-45 support for Behind, no commanding or ranging for the entire track due to a transmitter problem. Also, the initial telemetry lock was established late at 2301z due to the real-time schedule change from DSS-34 to DSS-45. The change was to assist the CASSINI project with an uplink capability for their pre-maneuver commanding. The late telemetry lock anomaly resulted in the loss of several minutes of SSR data. See DRs #C109148 and #C109149 for more information. * On day 332 (Nov 27), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1328z for 0.5 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 334 (Nov 29), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0234z for 19.6 hours. IMPACT (Part 15) reached 95% full at 1840z for 3.5 hours. PLASTIC(Part 17) reached 95% full at 2003z for 2.1 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 335 (Nov 30), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0655z for 7.8 hours. IMPACT (Part 15) reached 95% full at 0733z for 7.2 hours. PLASTIC(Part 17) reached 95% full at 0757z for 6.8 hours. SECCHI (Part 19) reached 100% full at 1350z for 0.9 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 336 (Dec 1), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0815z for 8.5 hours. SWAVES (Part 13) reached 100% full at 1730z for 0.5 hours. IMPACT (Part 15) reached 95% full at 1507z for 1.7 hours. IMPACT (Part 15) reached 95% full at 1725z for 0.6 hours. PLASTIC (Part 17) reached 95% full at 1607z for 0.6 hours. PLASTIC (Part 17) reached 95% full at 1731z for 0.4 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 337 (Dec 2), the SSR science partitions filled as follows: SWAVES (Part 13) reached 100% full at 1230z for 0.3 hours. The primary cause was the accumulated shortage of track time throughout the week. * The average daily SSR playback volume during the week was 4.9 gigabits for Ahead, and 3.5 gigabits for Behind. * The command to reduce the SWAVES telemetry rate on Behind was executed on Sunday, Dec 2. * NASA has given the go-ahead to pursue an extension of the agreement with ESA to use their ground stations. The new station in Argentina may or may not be part of this agreement, and will require testing. 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. ESA New Norcia passes are scheduled for Monday, Dec 3, and Tuesday, Dec 4. The station 26 passes on Tuesday, Dec 4, and Sunday, Dec 9, will be carried out at 240 kbps. * Behind has 11 passes during the week, and overall coverage is 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 passes on Wednesday and Thursday, Dec 13-14, and the station 45 pass on Sunday, Dec 16, will all be carried out at 160 kbps. * There was an earlier request to give up some Behind coverage during the week to SOHO to meet their schedule requirements, but this request could not be met. 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 8.7 hours. 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 11 passes during the week, and overall coverage is short 14.9 hours. 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 45 pass on Monday, Dec 17, and the station 26 pass on Thursday, Dec 20, will both 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 15 passes during the week, and overall coverage is nominal. The station 26 pass on Thursday, Dec 27, will be carried out at 240 kbps. ESA New Norcia passes are scheduled for Wednesday, Thursday, and Friday (Dec 26-28). * Behind has 12 passes during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Dec 24 (D14), Tuesday, Dec 25 (D63), Thursday, Dec 27 (D63), and Saturday, Dec 29 (D63). ESA New Norcia passes are scheduled for Wednesday and Thursday, Dec 26-27, and an ESA Cebreros pass is scheduled for Friday, Dec 28. 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. There are no 70 meter passes during the week. The station 65 pass on Monday, Dec 31, and the station 26 passes on Tuesday, Jan 1, and 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. Other * Station 45 is having problems which will result in a 2 dB drop in signal-to-noise until the end of the month. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- 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