STEREO Weekly Meeting Minutes for 2013-01-22 (Week 4) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 03 (Jan 14-20) * On day 014 (Jan 14), during the DSS-15 track for Ahead, turbo decoder lock was lost intermittently beginning at 1430z (BOT) through 2120z (EOT) due to an antenna elevation encoder problem. This anomaly resulted in sporadic SSR data loss from day 013 through 014. See DR #G113610 for more information. * On day 015 (Jan 15), during the DSS-15 track for Ahead, initial telemetry lock and commanding were established 1.25 hours late at 1545z due to an antenna elevation encoder problem. No ranging was performed for this track. This anomaly resulted in the loss of 1.25 hours of SSR data for each instrument. See DR #G113613 for more information. * On day 018 (Jan 18), during the DSS-34 track for Ahead, turbo decoder lock was lost briefly at 2056z. This anomaly resulted in the loss of one frame of SSR data. See DR #N108615 for more information. * On day 020 (Jan 20), during the DSS-15 track for Ahead, monitor data was not received throughout the entire support. Other than a delay in commanding, this anomaly had no other impact. See DR G113631 for more information. * On day 020 (Jan 20), during the DSS-15 track for Ahead, a DCD failover occurred as a result of a fault tolerance check. This anomaly had no impact, since all data were recovered. See DR N108607 for more information. * On day 016 (Jan 16), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 1052z for 8.4 hours. SWAVES (Part 13) reached 100% full at 2315z for 0.8 hours. IMPACT (Part 15) reached 95% full at 1222z for 7.2 hours. IMPACT (Part 15) reached 95% full at 2249z for 1.2 hours. PLASTIC(Part 17) reached 95% full at 1549z for 3.6 hours. PLASTIC(Part 17) reached 95% full at 2311z for 0.8 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 017 (Jan 17), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 14.4 hours. SWAVES (Part 13) reached 100% full at 1742z for 1.5 hours. SWAVES (Part 13) reached 100% full at 2319z for 0.7 hours. IMPACT (Part 15) remained 95% full at 0000z for 14.9 hours. IMPACT (Part 15) reached 95% full at 1654z for 2.5 hours. IMPACT (Part 15) reached 95% full at 2308z for 0.9 hours. PLASTIC(Part 17) remained 95% full at 0000z for 14.5 hours. PLASTIC(Part 17) reached 95% full at 1727z for 1.9 hours. PLASTIC(Part 17) reached 95% full at 2316z for 0.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 018 (Jan 18), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 19.2 hours. IMPACT (Part 15) remained 95% full at 0000z for 19.7 hours. PLASTIC(Part 17) remained 95% full at 0000z for 19.4 hours. SECCHI (Part 19) remained 100% full at 1212z for 7.0 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 019 (Jan 19), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0233z for 4.8 hours. SWAVES (Part 13) remained 100% full at 1624z for 2.8 hours. IMPACT (Part 15) remained 95% full at 0141z for 5.8 hours. IMPACT (Part 15) remained 95% full at 1606z for 3.3 hours. PLASTIC(Part 17) remained 95% full at 0219z for 5.2 hours. PLASTIC(Part 17) remained 95% full at 1626z for 3.0 hours. SECCHI (Part 19) remained 100% full at 0535z for 1.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 020 (Jan 20), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0513z for 2.2 hours. IMPACT (Part 15) remained 95% full at 0504z for 2.5 hours. PLASTIC(Part 17) remained 95% full at 0517z for 2.3 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 016 (Jan 16), during the DSS-32 (New Norcia) support for Behind, turbo decoder lock was lost briefly at 0048z. This anomaly resulted in the loss of six frames of SSR data. This anomaly was investigated with ESA and the cause was reported as unknown. * On day 017 (Jan 17), during the DSS-63 track for Behind, the antenna brake was applied at 1618z causing the loss of telemetry, commanding, and ranging for the remainder of the track. The problem was caused by a pump failure in the Hydrostatic Bearing Assembly. This anomaly resulted in the loss of 1.5 hours of SSR data. See DR #M107074 for more information. * On day 020 (Jan 20), during the DSS-65 track for Behind, initial telemetry lock was approximately 6 minutes late due to a MASER receiver failure. A switch to the HEMT receiver was performed and telemetry lock achieved at 1351z. Turbo decoder lock was also lost intermittently throughout the support due to weather, resulting in the loss of several minutes (16878 frames) of SSR data. Finally, during this support a DCD failover occurred as a result of a fault tolerance check. See DRs M107078, M107079 and N108613 respectively for more information. * On day 019 (Jan 19), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) remained 100% full at 1813z for 0.9 hours. The primary cause was the accumulated shortage of track time throughout the week. * The average daily SSR playback volume during the week was 1.3 gigabits for Ahead, and 2.7 gigabits for Behind. Week 04 (Jan 21-27) * Ahead has 11 passes during the week, and overall coverage is short 10.25 hours. No 70 meter passes are scheduled during the week. The station 25 pass on Tuesday, Jan 22, and the station 26 passes on Saturday and Sunday, Jan 26-27, will all be carried out at 240 kbps. ESA New Norcia passes are scheduled for Tuesday, Jan 22, and Thursday, Jan 24. * Behind has 12 passes during the week, and overall coverage is short 7.5 hours. 70 meter passes are scheduled using station 26 each day between Monday to Friday, Jan 21-25, with two 70 meter passes on Friday. The station 45 pass on Friday, Jan 25, and the station 26 pass on Saturday, Jan 26, will both be carried out at 160 kbps. ESA New Norcia passes are scheduled for Tuesday and Wednesday, Jan 22-23, and Saturday and Sunday, Jan 26-27. Week 05 (Jan 28-Feb 3) * The 48th momentum dump on Behind is scheduled for Monday, Jan 28, with ignition at 17:15 UT. * Ahead has 13 passes during the week, and overall coverage is short 13.4 hours. A 70 meter pass is scheduled for Sunday, Feb 3 (D14 at 720 kbps). The station 26 passes on Tuesday, Jan 29, Wednesday, Jan 30, and Friday, Feb 1, and the station 34 pass on Thursday, Jan 31, will all be carried out at 240 kbps. ESA New Norcia passes are scheduled for Monday, Jan 28 (twice), and Wednesday, Jan 30. * Behind has 12 passes during the week, and overall coverage is short 2.4 hours on Jan 29. 70 meter passes are scheduled for Monday, Jan 28 (D63), Tuesday, Jan 29 (D14), Wednesday, Jan 30 (D63), Thursday, Jan 31 (D63), Friday, Feb 1 (D14), Saturday, Feb 2 (D14 at 720 kbps), and Sunday, Feb 3 (D63 at 720 kbps). The station 26 support on Tuesday, Jan 29, will be carried out at 160 kbps. ESA New Norcia supports are on Wednesday, Thursday, and Friday, Jan 30-Feb 1. Week 06 (Feb 4-10) * Bind testing will be performed with the Ahead spacecraft using the new ESA station at Malargue, Argentina (D84), on Tuesday, Feb 5, between 18-20 UT. * Ahead has 11 passes during the week, and overall coverage is even. 70 meter passes are scheduled for Tuesday, Feb 5 (D63), Friday, Feb 8 (D14), and Saturday, Feb 9 (D14 at 720 kbps). The station 26 pass on Thursday, Feb 7, will be carried out at 240 kbps. ESA New Norcia supports are on Wednesday and Thursday, Feb 6-7, and on Sunday, Feb 10. * Behind has 11 passes during the week, and overall coverage is short 3.8 hours on day 37 (Feb 6). 70 meter passes are scheduled for Monday, Feb 4, Tuesday, Feb 5, and Thursday, Feb 7, all using station 63. The station 65 pass on Wednesday, Feb 6, and the station 26 passes on Wednesday, Feb 6, Friday, Feb 8, and Sunday, Feb 10, will all be carried out at 160 kbps. ESA New Norcia supports are on Thursday and Friday, Feb 7-8. Week 07 (Feb 11-17) * Additional bind testing will be performed with the Ahead spacecraft using the new ESA station at Malargue, Argentina (D84), on Tuesday, Feb 12, between 18-20 UT. * Ahead has 10 passes during the week, and overall coverage is short by 5.5 hours, mainly on Wednesday and Thursday, Feb 13-14. 70 meter passes are scheduled for Tuesday, Feb 12 (D14), Friday, Feb 15 (D14 at 720 kbps), Saturday, Feb 16 (D63) and Sunday, Feb 17 (D14 at 720 kbps). The station 26 pass on Wednesday, Feb 26, will be carried out at 240 kbps. ESA New Norcia supports are on Tuesday and Wednesday, Feb 12-13. * Behind has 12 passes during the week, and overall coverage will be short by 6.5 hours, mainly on Tuesday and Wednesday, Feb 12-13. 70 meter passes are on Monday, Feb 11 (D14), Tuesday, Feb 12 (D63), and Friday, Feb 15 (D63 at 720 kbps). The D26 passes on Wednesday, Feb 13, and Saturday, Feb 16, will be at 240 kbps. ESA New Norcia supports are on Thursday, Feb 14, and Saturday, Feb 16, and ESA Cebreros on Thursday, Feb 14. Week 08 (Feb 18-24) * The 54th momentum dump for Ahead is scheduled for Monday, Feb 18, with ignition at 19:00 UT. * The 49th momentum dump for Behind is scheduled for Tuesday, Feb 19, with ignition at 17:00 UT. This is much earlier than usual due to DSN schedule constraints. * Ahead has 9 passes, and overall coverage is nominal. 70 meter passes are on Tuesday, Feb 19 (D63 at 720 kbps) and Wednesday-Saturday (D14), Feb 20-13. D26 passes on Monday, Feb 18, and Sunday, Feb 24, will be carried out at 240 kbps. * Behind has 11 tracks, and overall coverage is nominal. 70 meter passes are on Tuesday, Feb 19, Thursday, Feb 21, and Friday, Feb 22 (all on D63) and Sunday (D14 at 720 kbps). The D55 pass on Monday, Feb 18, and the D34 pass on Sunday, Feb 14, are both at 160 kbps. ESA New Norcia passes are scheduled for Wednesday, Feb 20, and Friday, Feb 22, and an ESA Cebreros pass for Friday, Feb 22. Week 09 (Feb 25-Mar 3) * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Feb 26 (D63), Wednesday, Feb 27 (D14 at 720 kbps), Saturday, Mar 2 (D14), and Sunday, Mar 3 (D14). The station 26 and 45 passes on Monday, Feb 25, the station 26 pass on Thursday, Feb 28, and the station 65 pass on Sunday, Mar 3, will all be carried out at 240 kbps. An ESA New Norcia pass is scheduled for Thursday, Feb 28. * Behind has 13 passes during the week, and overall coverage is short 8.4 hours, mainly during the period from Thursday, Feb 28, to Friday, Mar 1. 70 meter passes are scheduled for Monday, Feb 25 (D14), Wednesday, Feb 27 (D14), Saturday, Mar 2 (D14 at 720 kbps), and Sunday, Mar 3 (D14 at 720 kbps). The station 24 pass on Tuesday, Feb 26, will be carried out at 160 kbps, and the station 26 pass on Thursday, Feb 28, will be carried out at 240 kbps. ESA New Norcia passes are scheduled for Tuesday, Feb 26, Wednesday, Feb 27, and Friday, Mar 1, and an ESA Cebreros pass is scheduled for Wednesday, Feb 27. Week 10 (Mar 4-10) * Ahead has 10 passes during the week, and overall coverage is short 14.3 hours. 70 meter passes are scheduled for Friday, Mar 8 (D14 at 720 kbps), and Sunday, Mar 10 (D63). The station 26 pass on Monday, Mar 4 will be carried out at 360 kbps, and the station 26 pass on Saturday, Mar 9, will be carried out at 240 kbps. * Behind has 10 passes during the week, and overall coverage is short 11.4 hours. 70 meter passes are scheduled for Monday, Mar 4 (D63), Wednesday, Mar 6 (D63), Thursday, Mar 7 (D63), Friday, Mar 8 (D63 at 720 kbps), and Sunday, Mar 10 (D63 at 720 kbps). The station 26 and 65 passes on Saturday, Mar 9, will both be carried out at 160 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 21 (021) T Jan 22 (022) W Jan 23 (023) T Jan 24 (024) F Jan 25 (025) S Jan 26 (026) S Jan 27 (027) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 28 (028) Behind: Momentum dump, 17:15 UT T Jan 29 (029) W Jan 30 (030) T Jan 31 (031) F Feb 01 (032) S Feb 02 (033) S Feb 03 (034) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 04 (035) T Feb 05 (036) W Feb 06 (037) T Feb 07 (038) F Feb 08 (039) S Feb 09 (040) S Feb 10 (041) Notes: * Significant telemetry shortfalls for the Behind spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 11 (042) T Feb 12 (043) W Feb 13 (044) T Feb 14 (045) F Feb 15 (046) S Feb 16 (047) S Feb 17 (048) Notes: * Significant telemetry shortfalls for both spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 18 (049) Ahead: Momentum dump, 19:00 UT T Feb 19 (050) Behind: Momentum dump, 17:00 UT W Feb 20 (051) T Feb 21 (052) F Feb 22 (053) S Feb 23 (054) S Feb 24 (055) ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 25 (056) T Feb 26 (057) W Feb 27 (058) T Feb 28 (059) F Mar 01 (060) S Mar 02 (061) S Mar 03 (062) Notes: * Significant telemetry shortfalls for the Behind spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 04 (063) T Mar 05 (064) W Mar 06 (065) T Mar 07 (066) F Mar 08 (067) S Mar 09 (068) S Mar 10 (069) 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