STEREO Weekly Meeting Minutes for 2013-12-03 (Week 49) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 48 (Nov 25-Dec 1) * On day 329 (Nov 25), during the DSS-15 support for Ahead , MOC commanding was delayed 21 minutes until 1446z due to no monitor data coming from the station. See DR# N109223 more information. * On day 331 (Nov 27), during the DSS-15 support for Ahead, the track was terminated three hours early at 1700z due to antenna oscillation problems. The SSR playback was stopped before releasing the antenna to prevent data loss. See DR# G114436 more information. * On day 334 (Nov 30), during the DSS-15 support for Ahead, no command uplink was provided due to a transmitter problem. See DR# G114440 more information. * On day 335 (Dec 1), the DSS-14 support for Ahead was cancelled at beginning of track due to antenna sub-reflector problems. On the next track with DSS-63 at 336-1000z, the SSR pointers were repositioned prior to the outage and all data were recovered. See DR# G114447 for more information. * On days 331-333 (Nov 27-29), the Comet ISON perihelion imaging operation was conducted successfully on both spacecraft. * On day 329 (Nov 25), during the DSS-26 support for Behind, turbo decoder lock was lost briefly at 2300z. This anomaly resulted in the loss of one frame of SSR data. * On day 331 (Nov 27), the DSS-15 support for Behind was cancelled due to antenna oscillation problems. The ongoing ESA Malargue (DSS-84) track was extended 3 hours until 2350z to prevent SSR data loss. See DR# G114447 for more information. * On day 333 (Nov 29), during the DSS-43 support for Behind, turbo decoder lock was lost intermittently beginning at 0855z through 0859z. This anomaly resulted in the loss of 546 frames of SSR data. A DR# has been requested for more information. * On day 335 (Dec 1), during the DSS-15 support for Behind, no command uplink was provided due to a transmitter problem. See DR# G114450 more information. * On day 329 and 330 (Nov 25, 26), the 17th and 18th SECCHI 180 degree Comet ISON rolls were executed successfully at 1000z each day. * On days 334 and 335 (Nov 30, Dec 1), the 1st and 2nd SECCHI 290 degree Comet ISON rolls were executed successfully at 0600z each day. * The average daily SSR playback volume during the week was 5.1 gigabits for Ahead, and 4.3 gigabits for Behind. * A question was asked about the uncommitted data from station 15. Aside from the antenna oscillation problems discussed above, and the transmitter problem which had no effect, there were no problems with the station 15 passes. * The MOC would like to thank ESA for their support during the Comet ISON operations, and the DSN for making station 15 available. * Station 15 will be coming back online sometime next week, a little earlier than originally expected. * There was a question raised about continuing SECCHI observations of Comet ISON. SECCHI would like to continue rolling to observe the remains of the comet for at least a little while. However, if the roll maneuvers interfere with getting enough track time, then the roll should be cancelled. They will monitor the data closely to determine whether the roll observations are still useful. 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 11 passes during the week, and overall coverage is short 12 hours, mainly between Tuesday-Friday, Dec 10-13. 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. ESA New Norcia passes are scheduled for Thursday, Dec 12, and Friday, Dec 13. However, because of the extra 3 hours of ESA track time during week 48, one of these tracks will likely be canceled. Week 51 (Dec 16-22) * Simultaneous 30 degree rolls of the Ahead spacecraft, and 290 degree rolls of the Behind 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. * 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 13 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 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Dec 17 (D43), and 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. Week 52 (Dec 23-29) * Simultaneous 30 degree rolls of the Ahead spacecraft, and 315 degree rolls of the Behind spacecraft, to observe Comet ISON are scheduled for Monday, Dec 23, 18-22 UT, Tuesday, Dec 24, 12-16 UT, and Wednesday, Dec 25, 2-6 UT. * APL will closed for the Christmas holiday starting the afternoon of Tuesday, Dec 24, and on Christmas Day, Dec 25. * The 27th SECCHI stepped calibration roll is scheduled for Thursday, Dec 26, starting at 13:10 UT. This is the aphelion roll. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Dec 23 (D63), Tuesday, Dec 24 (D14), and Friday, Dec 27 (D63). The following passes will be carried out at 160 kbps: Monday, Dec 23 (D45), and Thursday, Dec 26 (D26). * Behind has 14 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Saturday, Dec 28 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, Dec 24 (D26), Thursday, Dec 26 (D45), and Saturday, Dec 28 (D26). Week 01 (Dec 30-Jan 5) * APL will be closed for the New Year's Day holiday starting the afternoon of Tuesday, Dec 31, and on Jan 1. * Simultaneous 30 degree rolls of the Ahead spacecraft, and 315 degree rolls of the Behind spacecraft, to observe Comet ISON are scheduled for Monday, Dec 30, Tuesday, Dec 31, and Wednesday, Jan 1, between 2-6 UT each day. * Ahead has 8 passes during the week, and overall coverage is short 18.4 hours, mainly between Monday-Friday, Dec 30-Jan 3. 70 meter passes are scheduled for Tuesday, Dec 31 (D63), and Friday, Jan 3 (D63). The station 26 pass on Sunday, Jan 5, will be carried out at 160 kbps. * Behind has 8 passes during the week, and overall coverage is short 16.4 hours, mainly between Monday-Friday, Dec 30-Jan 3. 70 meter passes are scheduled for Saturday, Jan 4 (D63 at 720 kbps, D14). The following passes will be carried out at 160 kbps: Wednesday, Jan 1 (D25), and Sunday, Jan 5 (D25, D45). COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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) ------------------------------------------------------------------------------- Scheduled activities for Week 52: M Dec 23 (357) Ahead: 30 degree roll to observe Comet ISON, 6-10 UT Behind: 315 degree roll to observe Comet ISON, 6-10 UT T Dec 24 (358) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 315 degree roll to observe Comet ISON, 2-6 UT W Dec 25 (359) Christmas Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 315 degree roll to observe Comet ISON, 2-6 UT T Dec 26 (360) Behind: SECCHI stepped calibration roll, 13:10 UT F Dec 27 (361) S Dec 28 (362) S Dec 29 (363) ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Dec 30 (364) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 315 degree roll to observe Comet ISON, 2-6 UT T Dec 31 (365) Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 315 degree roll to observe Comet ISON, 2-6 UT W Jan 01 (001) New Year Ahead: 30 degree roll to observe Comet ISON, 2-6 UT Behind: 315 degree roll to observe Comet ISON, 2-6 UT T Jan 02 (002) F Jan 03 (003) S Jan 04 (004) S Jan 05 (005) Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Upcoming events: 2013: * Dec 3-Jan 8 Ahead: 30 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