STEREO Weekly Meeting Minutes for 2013-11-05 (Week 45) ANNOUNCEMENTS ------------- * ESA has informed the STEREO project that, due to budgetary and accounting reasons, telemetry support from the ESA stations for NASA will no longer be carried out, effective immediately. This is being done even though the current schedule has ESA tracks out through November, and the STEREO mission still has extra unallocated hours. The expected effect is that many of the upcoming weeks may suffer from telemetry shortages. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 44 (Oct 28-Nov 3) * On day 301 (Oct 28), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 1115z. The SSR pointers for were repositioned prior to the outage and all data were recovered. * On day 305 (Nov 1), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0910z. This anomaly resulted in the loss of one frame of SSR data. * On day 307 (Nov 3), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 1443z. This anomaly resulted in the loss of two frames of SSR data. * On day 304 (Oct 31), the SECCHI instrument on Ahead reset at 21:27:36z. The SECCHI team reconfigured the instrument to operational mode the next day at 305-1113z. This was the 32nd reset of SECCHI on the Ahead spacecraft. * On day 306 (Nov 2), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 1059z for 7.6 hours. PLASTIC (Part 17) reached 95% full at 0658z for 11.6 hours. * On day 305 (Nov 1), during the DSS-45 support for Behind, MOC commanding was delayed twenty minutes until 2225z due no monitor data coming from the station. See DR# N109192 more information. Monitor data was visible at GSFC and at JPL, but not at APL. The cause is still under investigation. * On day 306 (Nov 2), during the DSS-25 support for Behind, turbo decoder lock was lost briefly at 1711z. This anomaly resulted in the loss of one frame of SSR data. * On day 307 (Nov 3), during the DSS-26 support for Behind, turbo decoder lock was lost briefly at 1928z. This anomaly resulted in the loss of one frame of SSR data. * On days 301, 302, and 303, the 4th, 5th, and 6th SECCHI 180 degree Comet Ison rolls were executed successfully at 1400z each day. * The average daily SSR playback volume during the week was 3.2 gigabits for Ahead, and 3.6 gigabits for Behind. Week 45 (Nov 4-10) * 180 degree rolls of the Behind spacecraft to observe Comet ISON were carried out yesterday and today (Nov 4-5), and will be carried out tomorrow, Nov 6, from 6-10 UT each day. * There was a problem with the station 63 subreflector during the pass for Behind today (Nov 5) which caused a 38 minute delay in telemetry receipt. This resulted in a loss of 36 minutes of telemetry. * There will be an internet upgrade at APL starting Wednesday, Nov 6, from 23:30-02:30 UT, which is outside of any tracks. There will be no instrument commanding during this time. * Ahead has 8 passes during the week, and overall coverage is currently nominal, but may be affected by the cancelling of ESA passes. 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 currently scheduled for Thursday, Nov 7, but is expected to be cancelled. * Behind has 8 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), and Thursday, Nov 7 (D26). Week 46 (Nov 11-17) * DCD maintenance is scheduced between 08:05-09:05 UT on Monday, Nov 11. This will result in the delay of some IDR files. * 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 currently nominal, but may be affected by the cancelling of ESA passes. 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, but is expected to be cancelled. * Behind has 11 passes during the week, and overall coverage is currently nominal, but may be affected by the cancelling of ESA passes. 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, but are expected to be cancelled. Week 47 (Nov 18-24) * MAVEN is currently scheduled for launch on Monday, Nov 18. * 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 currently nominal, but may be affected by the cancelling of ESA passes. 70 meter passes are scheduled for Wednesday, Nov 20 (D63), Friday, Nov 22 (D63, D14 at 720 kbps), and Sunday, Nov 24 (D43, D63). An ESA New Norcia pass is scheduled for Wednesday, Nov 20, but is expected to be cancelled. * Behind has 11 passes during the week, and overall coverage is currently nominal, but may be affected by the cancelling of ESA passes. 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. ESA New Norcia passes are scheduled for Friday, Nov 22, and Sunday, Nov 24, but are expected to be cancelled. 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 currently nominal, but may be affected by the cancelling of ESA passes. 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, but are expected to be cancelled. * Behind has 16 passes during the week, and overall coverage is currently nominal, but may be affected by the cancelling of ESA passes. 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 Malargue passes are scheduled for Wednesday, Nov 27, and Thursday, Nov 28, but are expected to be cancelled. * Several passes during the week for both spacecraft will be carried out with uncommitted data on station 15. Week 49 (Dec 2-8) * The 28th SECCHI calibration roll on Ahead is scheduled for Tuesday, Dec 3, starting at 14:30 UT. * The first of the 30 degree rolls of the Ahead to observe Comet ISON are scheduled for Wednesday-Friday, Dec 4-6, between 2-6 UT each day. * 290 degree rolls of the Behind spacecraft to observe Comet ISON will be carried out Monday-Saturday, Dec 2-7, between 18-22 UT each day. * Ahead has 9 passes during the week, and overall coverage is short 10.7 hours, mainly between Tuesday-Wednesday, Dec 3-4. 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. * Behind has 10 passes during the week, and overall coverage is short 12.25 hours, mainly between Thursday-Saturday, Dec 5-7. 70 meter passes are scheduled for Monday, Dec 2 (D43), Tuesday, Dec 3 (D43 at 720 kbps), and Wednesday, Dec 4 (D43 at 720 kbps). The following passes will be carried out at 160 kbps, both using station 26: Saturday, Dec 7, and Sunday, Dec 8. 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. * 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. The following passes will be carried out at 160 kbps, both using station 26: Wednesday, Dec 11, and Sunday, Dec 15. Other * The IMPACT team reports seeing a 64 second periodicity in their MAG data on the Behind spacecraft, but only during periods of slow solar wind. They are asking the other instrument teams whether there are any operations which might be causing this. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- 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, 18-22 UT T Dec 03 (337) Ahead: SECCHI stepped calibration roll, 14:30 UT Behind: 290 degree roll to observe Comet ISON, 18-22 UT W Dec 04 (338) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 18-22 UT T Dec 05 (339) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 18-22 UT F Dec 06 (340) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 290 degree roll to observe Comet ISON, 18-22 UT S Dec 07 (341) Behind: 290 degree roll to observe Comet ISON, 18-22 UT S Dec 08 (342) Notes: * Comet ISON in HI1 field-of-view on Ahead unrolled, Dec 1-7 * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- 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) S Dec 14 (348) S Dec 15 (349) 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