STEREO Weekly Meeting Minutes for 2013-10-15 (Week 42) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 41 (Oct 7-13) * On day 280 (Oct 7), during the DSS-65 support for Ahead, telemetry was delayed by 20 minutes until 0625z due to a low signal level. Telemetry was shipped from the DSS-54 front end (attenuator engineering shadow track) until 0657z. Also, no commanding or ranging was conducted due to a transmitter problem that occurred prior to the track. See DRs #M107541 and #M107540 respectively for more information. * On day 281 (Oct 8), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0726z. This anomaly resulted in the loss of 16 frames of SSR data. * On day 282 (Oct 9), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 1953z. This anomaly resulted in the loss of one frame of SSR data. * On day 283 (Oct 10), the DSS-65 support for Ahead was deleted due to transmitter maintenance. The SSR pointers for SWAVES, IMPACT, PLASTIC, and SECCHI (13, 15, 17, & 20) were repositioned prior to the outage on the next track and all data was recovered. Due to the amount of time between tracks, the SECCHI SSR partition 19 pointers could not be repositioned. This anomaly resulted in the loss of nine hours (from 282-2025z to 283-0525z) of SECCHI data. The SECCHI team reports that attitude history data also appear to be missing for a similar time period. * On day 280 (Oct 7), during the DSS-65 support for Behind, no commanding or ranging was conducted due to a transmitter problem that occurred prior to the track. See DR #M107543 for more information. * On day 286 (Oct 13), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1046z. This anomaly resulted in the loss of 23 frames of SSR data. * On day 287 (Oct 14), during the DSS-34 support for Behind, turbo decoder lock was lost intermittently beginning at 0033z through 0151z. This anomaly resulted in the loss of three frames of SSR data. * On day 281 (Oct 8), the test SECCHI 290 degree ISON roll on Behind was executed successfully at 1600z. The SECCHI team is still evaluating the data. * On day 282 (Oct 9), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 2053z for 1.9 hours. * On day 283 (Oct 10), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1346z for 0.1 hours. * On day 284 (Oct 11), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0404z for 9.4 hours. * On day 286 (Oct 13), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0951z for 1.5 hours. * The SWAVES team will investigate whether their telemetry rate has changed unexpectedly on the Behind spacecraft. * The average daily SSR playback volume during the week was 3.8 gigabits for Ahead, and 4.4 gigabits for Behind. * The SECCHI team reports that Comet ISON has now entered the HI2 field-of-view on Ahead. Week 42 (Oct 14-20) * An internet upgrade will be carried out at APL tomorrow (Oct 16) between 22-23 UT. * A PIT test will be carried out on Thursday, Oct 17, between 14:30-16:00 UT. Simulated data will be played during this test, which should not be visible to the instrument teams. * The 61st momentum dump on Ahead is scheduled for Wednesday, Oct 16, with ignition at 14:00 UT. * The 56th momentum dump on Behind is scheduled for Wednesday, Oct 16, with ignition at 15:00 UT. * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 14 (D63), and Saturday, Oct 19 (D63). * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 14 (D14), Friday, Oct 18 (D43 at 720 kbps), and Sunday, Oct 20 (D43 at 720 kbps, D63). The following passes will be carried out at 160 kbps: Tuesday, Oct 15 (D26), Friday, Oct 18 (D26), and Saturday, Oct 19 (D25). Week 43 (Oct 21-27) * New G&C control parameters will be uplinked to the Ahead spacecraft on Wednesday, Oct 23. This change is expected to reduce the amount of jitter about the Y and Z axes. * The first 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Thursday-Saturday, Oct 24-26, from 6-10 UT each day. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 21 (D14), Tuesday, Oct 22 (D63), Friday, Oct 25 (D63), and Saturday, Oct 26 (D63). The station 45 pass on Wednesday, Oct 23, will be carried out at 160 kbps. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 21 (D43, D63, both at 720 kbps), Tuesday, Oct 22 (D43), Saturday, Oct 26 (D63), and Sunday, Oct 27 (D63). The station 24 pass on Tuesday, Oct 24, will be carried out at 160 kbps. Week 44 (Oct 28-Nov 3) * Daylight savings time ends in the U.S. on Sunday, Nov 3, at 06:00 UT. * 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Monday-Wednesday, Oct 28-30, from 14-18 UT each day. * The MOM mission is scheduled for launch on Monday, Oct 28. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 28 (D43, D63, both at 720 kbps), and Saturday, Nov 2 (D14 at 720 kbps). The station 54 pass on Friday, Nov 1, will be carried out at 160 kbps. ESA New Norcia passes are scheduled for Tuesday, Oct 29, and Wednesday, Oct 30. * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 28 (D43), Tuesday, Oct 29 (D43 at 720 kbsp), and Thursday, Oct 31 (D43). The following passes will be carried out at 160 kbps, both using station 26: Thursday, Oct 31, and Sunday, Nov 3. An ESA New Norcia pass is scheduled for Friday, Nov 1. Week 45 (Nov 4-10) * 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Monday-Wednesday, Nov 4-6, from 6-10 UT each day. * There will be an internet upgrade at APL starting Wednesday, Nov 6, from 23:30-02:30 UT. There will be no instrument commanding during this time. * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Nov 4 (D63), Tuesday, Nov 5 (D14), and Saturday, Nov 9 (D14 at 720 kbps). An ESA New Norcia pass is scheduled for Thursday, Nov 7. * Behind has 9 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Nov 5 (D63). The following passes will be carried out at 160 kbps: Monday, Nov 4 (D26), Thursday, Nov 7 (D26), and Sunday, Nov 10 (D45). Week 46 (Nov 11-17) * 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out on Monday, Nov 11, from 2-6 UT, Tuesday, Nov 12, from 10-14 UT, and Wednesday, Nov 13, from 2-6 UT. * The 57th momentum dump on Behind is scheduled for Thursday, Nov 14, with ignition at 23:00 UT. * Ahead has 8 passes during the week, and overall coverage is short 8.4 hours, mainly between days 317-318 ((Nov 13-14). 70 meter passes are scheduled for Tuesday, Nov 12 (D63), and Friday, Nov 15 (D63). An ESA New Norcia pass is scheduled for Wednesday, Nov 13. * Behind has 11 passes during the week, and overall coverage is short 7.8 hour, mainly between days 317-318 (Nov 13-14). 70 meter passes are scheduled for Monday, Nov 11 (D63), and Friday, Nov 15 (D63 at 720 kbps). The following tracks will be carried out at 160 kbps: Tuesday, Nov 12 (D25), Thursday, Nov 14 (D26), and Sunday, Nov 17 (D26). ESA New Norcia passes are scheduled for Tuesday, Nov 12, and Thursday, Nov 14. Week 47 (Nov 18-24) * The 62nd momentum dump on Ahead is scheduled for Tuesday, Nov 19, with ignition at 13:30 UT. * Daily 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Thursday-Sunday, Nov 21-24, between 6-10 UT each day. * Ahead has 10 passes during the week, and overall coverage is short 6.5 hours, mainly on Thursday, Nov 21. 70 meter passes are scheduled for Wednesday, Nov 20 (D63), Friday, Nov 22 (D63, D14 at 720 kbps), and Sunday, Nov 24 (D43, D63). The station 24 pass on Sunday, Nov 24, will be carried out at 160 kbps. * Behind has 11 passes during the week, and overall coverage is short 6.5 hours, mainly between Thursday-Sunday, Nov 21-24. 70 meter passes are scheduled for Tuesday, Nov 19 (D63), and Wednesday, Nov 20 (D63). The following passes will be carried out at 160 kbps, all using station 26: Monday, Nov 18, Thursday, Nov 21, and Saturday, Nov 23. Week 48 (Nov 25-Dec 1) * There will be a return-to-service track for station 15 with the Ahead spacecraft on Monday, Nov 25, and with the Behind spacecraft on Tuesday, Nov 26. * 180 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Monday-Tuesday, Nov 25-26, between 10-14 UT each day. * 290 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Saturday and Sunday, Nov 30-Dec 1, between 6-10 UT each day. * APL will be closed Thursday-Friday, Nov 28-29, for the Thanksgiving holiday. * Comet ISON reaches perihelion on Thursday, Nov 28. * Ahead has 16 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Nov 25 (D63), Tuesday, Nov 26 (D63), Friday, Nov 29 (D63), Saturday, Nov 30 (D14), and Sunday, Dec 1 (D63, D14). The following tracks will be carried out at 160 kbps: Wednesday, Nov 27 (D54), and Friday, Nov 29 (D26). ESA New Norcia tracks are scheduled each day between Wednesday-Friday, Nov 27-29. * Behind has 16 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Nov 26 (D14), Thursday, Nov 28 (D14 at 720 kbps), and Friday, Nov 29 (D34, D14). The following passes will be carried out at 160 kbps, all using station 26: Monday, Nov 25, Saturday, Nov 30, and Sunday, Dec 1. ESA Cebreros passes are scheduled for Wednesday, Nov 27, and Thursday, Nov 28. * Several passes during the week for both spacecraft will be carried out with uncommitted data. Other * Meetings for STEREO conjunction planning have been postponed until after the federal shutdown. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 14 (287) Ahead: Attenuator engineering demo using D45, 20:35 UT T Oct 15 (288) Behind: Attenuator engineering demo using D45, 04:30 UT W Oct 16 (289) Momentum dumps, Ahead: 14:00 UT, Behind: 15:00 UT T Oct 17 (290) F Oct 18 (291) S Oct 19 (292) S Oct 20 (293) Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 21 (294) T Oct 22 (295) W Oct 23 (296) T Oct 24 (297) Behind: 180 degree roll to observe Comet ISON, 6-10 UT F Oct 25 (298) Behind: 180 degree roll to observe Comet ISON, 6-10 UT S Oct 26 (299) Behind: 180 degree roll to observe Comet ISON, 6-10 UT S Oct 27 (300) Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 ------------------------------------------------------------------------------- Scheduled activities for Week 44: M Oct 28 (301) Behind: 180 degree roll to observe Comet ISON, 14-18 UT T Oct 29 (302) Behind: 180 degree roll to observe Comet ISON, 14-18 UT W Oct 30 (303) Behind: 180 degree roll to observe Comet ISON, 14-18 UT T Oct 31 (304) F Nov 01 (305) S Nov 02 (306) S Nov 03 (307) Daylight savings time ends in U.S. Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 ------------------------------------------------------------------------------- Scheduled activities for Week 45: M Nov 04 (308) Behind: 180 degree roll to observe Comet ISON, 6-10 UT T Nov 05 (309) Behind: 180 degree roll to observe Comet ISON, 6-10 UT W Nov 06 (310) Behind: 180 degree roll to observe Comet ISON, 6-10 UT T Nov 07 (311) F Nov 08 (312) S Nov 09 (313) S Nov 10 (314) Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 ------------------------------------------------------------------------------- Scheduled activities for Week 46: M Nov 11 (315) Behind: 180 degree roll to observe Comet ISON, 2-6 UT T Nov 12 (316) Behind: 180 degree roll to observe Comet ISON, 10-14 UT W Nov 13 (317) Behind: 180 degree roll to observe Comet ISON, 2-6 UT T Nov 14 (318) Behind: Momentum dump, 23:00 UT F Nov 15 (319) S Nov 16 (320) S Nov 17 (321) Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 * Significant telemetry shortages expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 47: M Nov 18 (322) T Nov 19 (323) Ahead: Momentum dump, 13:30 UT W Nov 20 (324) T Nov 21 (325) Behind: 180 degree roll to observe Comet ISON, 6-10 UT F Nov 22 (326) Behind: 180 degree roll to observe Comet ISON, 6-10 UT S Nov 23 (327) Behind: 180 degree roll to observe Comet ISON, 6-10 UT S Nov 24 (328) Behind: 180 degree roll to observe Comet ISON, 6-10 UT Notes: * Comet ISON in HI2 field-of-view on Ahead, Oct 10-Nov 23 * Comet ISON in HI1 field-of-view on Ahead, Nov 21-28 * Significant telemetry shortages expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 48: M Nov 25 (329) Behind: 180 degree roll to observe Comet ISON, 10-14 UT T Nov 26 (330) Behind: 180 degree roll to observe Comet ISON, 10-14 UT W Nov 27 (331) T Nov 28 (332) Both: Perihelion passage of Comet ISON F Nov 29 (333) S Nov 30 (334) Behind: 290 degree roll to observe Comet ISON, 6-10 UT S Dec 01 (335) Behind: 290 degree roll to observe Comet ISON, 6-10 UT Notes: * Comet ISON in HI1 field-of-view on Ahead, Nov 21-28 * Comet ISON in HI1 field-of-view on Ahead unrolled, Dec 1-7 ------------------------------------------------------------------------------- Upcoming events: 2013: * Nov 30-Dec 7 Behind: Daily 290 degree rolls for Comet ISON * Dec 1-7 Ahead: Comet ISON in HI1 field-of-view unrolled * Dec 3-Jan 8 Ahead: 30 degree rolls 3 days/week for Comet ISON * Dec 8-Dec 20 Behind: 290 degree rolls 3 days/week for Comet ISON * Dec 12 Ahead: Mercury transit * Dec 20-Jan 8 Behind: 315 degree rolls 3 days/week for Comet ISON 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: * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * 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