STEREO Weekly Meeting Minutes for 2013-11-19 (Week 47) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 46 (Nov 11-17) * On day 318 (Nov 14), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0903z. This anomaly resulted in the loss of 16 frames of SSR data. * On day 320 (Nov 16), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0725z. This anomaly resulted in the loss of one frame of SSR data. * On day 319 (Nov 15), during the DSS-63 support for Behind, turbo decoder lock was lost intermittently beginning at 1207z through 1216z. This anomaly resulted in the loss of 6675 frames of SSR data. See DR# N109204 more information. * On day 315 (Nov 11), the 10th SECCHI 180 degree Comet ISON roll was executed successfully on Behind at 0200z. * On day 315 (Nov 11), the SSR science partitions on Behind filled as follows: PLASTIC (Part 17) reached 95% full at 0803z for 2.4 hours. * On day 316 (Nov 12), the 11th SECCHI 180 degree Comet ISON roll was executed successfully on Behind at 1000z. * On day 316 (Nov 12), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1745z for 2.7 hours. PLASTIC (Part 17) reached 95% full at 1500z for 5.6 hours. * On day 317 (Nov 13), the 12th SECCHI 180 degree Comet ISON roll was executed successfully on Behind at 0200z. * On day 317 (Nov 13), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0300z for 11.0 hours. SWAVES (Part 13) reached 100% full at 1923z for 4.6 hours. IMPACT (Part 15) reached 95% full at 0823z for 5.8 hours. IMPACT (Part 15) reached 95% full at 1913z for 4.8 hours. PLASTIC (Part 17) reached 95% full at 0209z for 12.0 hours. PLASTIC (Part 17) reached 95% full at 1835z for 5.4 hours. * On day 318 (Nov 14), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 20.3 hours. IMPACT (Part 15) remained 95% full at 0000z for 20.9 hours. PLASTIC(Part 17) remained 95% full at 0000z for 20.6 hours. SECCHI (Part 19) reached 100% full at 1747z for 2.5 hours. * On day 318 (Nov 14), the 57th momentum dump was executed successfully on Behind at 2300Z, which imparted a delta V of 0.052 m/sec. * On day 319 (Nov 15), the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 1011z for 1.8 hours. IMPACT (Part 15) reached 95% full at 0930z for 2.5 hours. PLASTIC (Part 17) reached 95% full at 0824z for 3.6 hours. The cause of the partition filling during the week was the cancellation of the ESA tracks. * The average daily SSR playback volume during the week was 3.0 gigabits for Ahead, and 2.7 gigabits for Behind. Week 47 (Nov 18-24) * MAVEN successfully launched on Monday, Nov 18. * The 62nd momentum dump on Ahead took place this morning (Nov 19), with ignition at 13:30 UT. * The DSN has brought a dropped frame issue to the attention of the MOC. At the end of a momentum dump maneuver, the gyros are turned back off. This results in a temporary glitch in pointing for a few minutes which can result in the dropping of telemetry lock. The MOC is looking into changing the CONOPS to avoid this. * 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 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Nov 20 (D63), Friday, Nov 22 (D63, D14 at 720 kbps), and Sunday, Nov 24 (D43, D63). * Behind has 13 passes during the week, and overall coverage is nominal. 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 18 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 17 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: Monday, Nov 25 (D26), and Saturday, Nov 30 (D26). ESA Malargue 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 on station 15. Week 49 (Dec 2-8) * The first of the 30 degree rolls of the Ahead to observe Comet ISON are scheduled for Wednesday-Friday, Dec 4-6, between 0:01-4:00 UT each day. * 290 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Monday, Dec 2, 2-6 UT, Tuesday, Dec 3, 0:01-4 UT, Wednesday, Dec 4, 0:01-4 UT, Thursday, Dec 5, 0:01-4 UT, Friday, Dec 6, 0:01-4 UT, and Saturday, Dec 7, between 2-6 UT. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Dec 2 (D63), Wednesday, Dec 4 (D63), Friday, Dec 6 (D63), Saturday, Dec 7 (D63), and Sunday, Dec 8 (D63, D43 at 720 kbps). The station 15 pass on Thursday, Dec 5, will be performed with noncommitted data. An ESA New Norcia pass is scheduled for Tuesday, Dec 3. * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Dec 2 (D43), Tuesday, Dec 3 (D43 at 720 kbps), Wednesday, Dec 4 (D43 at 720 kbps), and Thursday, Dec 5 (D43 at 720 kbps). The station 26 pass on Sunday, Dec 8, will be carried out at 160 kbps. Week 50 (Dec 9-15) * Simultaneous 30 degree rolls of Ahead, and 290 degree rolls of Behind, to observe Comet ISON, are scheduled for Monday-Wednesday, Dec 9-11, between 2-6 UT each day. * A transit of Mercury across the disk of the Sun will be observed by the Ahead spacecraft on Thursday, Dec 12, between approximately 2:00-7:20 UT. The complete period during which Mercury will be visible in either the COR1 or EUVI fields of view ranges from Wednesday, Dec 11, from approximately 11 UT, to Thursday, Dec 12, until approximately 19 UT, though visibility will depend on the coronal brightness behind Mercury. * The 28th SECCHI stepped calibration roll on Ahead is scheduled for Friday, Dec 13, starting at 04:05 UT. * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Dec 9 (D63,), Tuesday, Dec 10 (D63), Wednesday, Dec 11 (D14), Thursday, Dec 12 (D43), Saturday, Dec 14 (D63), and Sunday, Dec 15 (D63). * Behind has 8 passes during the week, and overall coverage is short 23.2 hours, mainly between Tuesday-Saturday, Dec 10-14. A 70 meter pass is scheduled for Friday, Dec 13 (D14). The following passes will be carried out at 160 kbps, both using station 26: Wednesday, Dec 11, and Sunday, Dec 15. * There was some discussion about whether the in situ teams can lower their telemetry rates during the week to avoid losing data. However, this does not appear to be practical. Week 51 (Dec 16-22) * 30 degree rolls of the Ahead spacecraft to observe Comet ISON are scheduled for Monday, Dec 16, 18-22 UT, Tuesday, Dec 17, 12-16 UT, and Wednesday, Dec 18, 2-6 UT. * 290 degree rolls of the Behind spacecraft to observe Comet ISON are scheduled for Monday, Dec 16, 2-6 UT, Tuesday, Dec 17, 14-18 UT, and Wednesday, Dec 18, 2-6 UT. * The third battery discharge cycle on Behind is scheduled for Wednesday, Dec 18, starting at 13:30 UT. * The 63rd momentum dump on Ahead is scheduled for Thursday, Dec 19, with ignition at 13:30 UT. * The 58th momentum dump on Behind is scheduled for Thursday, Dec 19, with ignition at 15:00 UT. * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Dec 16 (D63), Tuesday, Dec 17 (D43 at 720 kbps), and Friday, Dec 20 (D63). * Behind has 11 passes during the week, and overall coverage is short 3.8 hours, mainly on Tuesday, Dec 17. A 70 meter pass is scheduled for Friday, Dec 20 (D43 at 720 kbps). The following passes will be carried out at 160 kbps, all using station 26: Wednesday, Dec 18, Friday, Dec 20, and Sunday, Dec 22. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- Scheduled activities for Week 49: M Dec 02 (336) Behind: 290 degree roll to observe Comet ISON, 2-6 UT T Dec 03 (337) Behind: 290 degree roll to observe Comet ISON, 0-4 UT W Dec 04 (338) Ahead: 30 degree roll to observe Comet ISON, 0-4 UT Behind: 290 degree roll to observe Comet ISON, 0-4 UT T Dec 05 (339) Ahead: 30 degree roll to observe Comet ISON, 0-4 UT Behind: 290 degree roll to observe Comet ISON, 0-4 UT F Dec 06 (340) Ahead: 30 degree roll to observe Comet ISON, 0-4 UT Behind: 290 degree roll to observe Comet ISON, 0-4 UT S Dec 07 (341) Behind: 290 degree roll to observe Comet ISON, 2-6 UT S Dec 08 (342) Notes: * Comet ISON in HI1 field-of-view on Ahead unrolled, Dec 1-7 ------------------------------------------------------------------------------- Scheduled activities for Week 50: M Dec 09 (343) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 2-6 UT T Dec 10 (344) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 2-6 UT W Dec 11 (345) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 2-6 UT T Dec 12 (346) Ahead: Mercury transit, 2:00-7:20 UT F Dec 13 (347) Ahead: SECCHI stepped calibration roll, 04:05 UT S Dec 14 (348) S Dec 15 (349) Notes: * Significant telemetry shortages are expected for the Behind spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 51: M Dec 16 (350) Ahead: 30 degree roll to observe Comet ISON, 18-22 UT Behind: 290 degree roll to observe Comet ISON, 18-22 UT T Dec 17 (351) Ahead: 30 degree roll to observe Comet ISON, 12-16 UT Behind: 290 degree roll to observe Comet ISON, 12-16 UT W Dec 18 (352) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 2-6 UT Behind: Battery discharge cycle, 13:30 UT T Dec 19 (353) Momentum dumps: Ahead, 13 UT, Behind 15 UT F Dec 20 (354) S Dec 21 (355) S Dec 22 (356) Notes: * Significant telemetry shortages are expected for the Behind spacecraft during the week. ------------------------------------------------------------------------------- Upcoming events: 2013: * 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 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