STEREO Weekly Meeting Minutes for 2013-10-08 (Week 41) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 40 (Sep 30-Oct 6) * On day 276 (Oct 3), during the DSS-65 support for Ahead, turbo decoder lock was lost intermittently beginning at 0605z through 0817z. This anomaly resulted in the loss of 20 frames of SSR data. * On day 277 (Oct 4), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 1516z. This anomaly resulted in the loss of 73 frames of SSR data. See DR #N109148 for more information. * On day 277 (Oct 4), the MOC successfully conducted the IMU-2 LIM testing on Ahead from 1400z through 1900z. During this time, the IMU data was enabled for use by the G&C. The LIM values and spacecraft pointing (X, Y, and Z) returned to the same values prior to the day 261 IMU-2 power off. The SECCHI team has not yet analyzed their data to see if the pointing improved during this period. * On day 273 (Sep 30), during the DSS-34 support for Behind, turbo decoder lock was lost briefly at 0603z. This anomaly resulted in the loss of one frame of SSR data. * On day 274 (Oct 1), during the DSS-26 support for Behind, turbo decoder lock was lost briefly at 275-0104z. This anomaly resulted in the loss of one frame of SSR data. * On day 276 (Oct 3), during the DSS-65 support for Behind, turbo decoder lock was lost intermittently beginning at 1423z through 1615z. This anomaly resulted in the loss of 123 frames of SSR data. See DR #N109144 for more information. * On day 279 (Oct 6), during the DSS-55 support for Behind, turbo decoder lock was lost briefly at 1607z. This anomaly resulted in the loss of one frame of SSR data. * The average daily SSR playback volume during the week was 3.9 gigabits for Ahead, and 4.3 gigabits for Behind. * The primary NASA MUG unit was upgraded as scheduled on Tuesday, Oct 1. The scheduled maintenance for the backup unit on Thursday, Oct 3, has been postponed due to the government shutdown. Week 41 (Oct 7-13) * Station 65 experienced issues with the transmitter during the scheduled pass for Ahead on Monday, Oct 7. This resulted in a 20 minute delay in telemetry, and no transmitter for the entire track. Downlink was started on station 54, and then switched over to station 65 once that station was repaired. * Attenuator engineering demos will be carried out with beacon telemetry from the Ahead spacecraft using station 54 on Monday, Oct 7, at 05:40 UT, and station 34 on Thursday, Oct 10, at 20:50 UT. * A test 290 degree roll of the Behind spacecraft to prepare for the Comet ISON observations is scheduled for Tuesday, Oct 8, from 16-20 UT. At the time of the telecon, it was currently underway. * The station 65 transmitter is still red, and is expected to be back online tomorrow (Oct 9) at 17:00 UT. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Oct 8 (D63), Wednesday, Oct 9 (D14 at 720 kbps), Friday, Oct 11 (D63 at 720 kbps), and Saturday, Oct 12 (D63). The station 45 pass on Sunday, Oct 13, will be carried out at 160 kbps. * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Oct 7 (D43 at 720 kbps), Tuesday, Oct 8 (D43 at 720 kbps), Wednesday, Oct 9 (D14), Friday, Oct 11 (D63, D14), and Sunday, Oct 13 (D63). The station 26 pass on Thursday, Oct 10, will be carried out at 240 kbps. The following passes will be carried out at 160 kbps: Monday, Oct 7 (D65), and Sunday, Oct 13 (D34). Week 42 (Oct 14-20) * An attenuator engineering demo is scheduled for the Ahead spacecraft using station 45 on Monday, Oct 14, starting at 20:35 UT, and on the Behind spacecraft using station 45 on Tuesday, Oct 15, at 04:30 UT. * 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) * An attenuator engineering demo is scheduled for the Ahead spacecraft using station 54, on Wednesday, Oct 23, starting at 07:20 UT. This test may be canceled, due to the successful test yesterday (Oct 7). * 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 11 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. A 70 meter pass is scheduled for Tuesday, Oct 29 (D43 at 720 kbsp). 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 Monday-Wednesday, Nov 11-13, from 2-4 UT each day. * The 57th momentum dump on Behind is scheduled for Thursday, Nov 14, with ignition at 23:00 UT. * Ahead has 7 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, and Friday, Nov 15. * Behind has 9 passes during the week, and overall coverage is short 12.8 hour, mainly between days 316-318 (Nov 12-14). A 70 meter pass is scheduled for 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). * The ESA schedule for the week is still being worked. It appears that the Ahead schedule is probably okay, but the Behind schedule is still being worked. ESA tracks are expected for both spacecraft, but the timing is not ideal. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 07 (280) Ahead: Attenuator engineering demo using D54, 05:40 UT T Oct 08 (281) Behind: 290 degree test roll for Comet ISON, 16-20 UT W Oct 09 (282) T Oct 10 (283) Ahead: Comet ISON enters HI2 field-of-view Ahead: Attenuator engineering demo using D34, 20:50 UT F Oct 11 (284) S Oct 12 (285) S Oct 13 (286) ------------------------------------------------------------------------------- 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) Ahead: Attenuator engineering demo using D54, 07:20 UT 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, 2-4 UT T Nov 12 (316) Behind: 180 degree roll to observe Comet ISON, 2-4 UT W Nov 13 (317) Behind: 180 degree roll to observe Comet ISON, 2-4 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. ------------------------------------------------------------------------------- Upcoming events: 2013: * Oct 10-Nov 23 Ahead: Comet ISON in HI2 field-of-view * Oct 24-Nov 20 Behind: 180 degree rolls 3 days/week for Comet ISON * Nov 21-26 Behind: Daily 180 degree rolls for Comet ISON * Nov 21-28 Ahead: Comet ISON in HI1 field-of-view * Nov 28 Both: Perihelion passage of Comet ISON http://stereo-ssc.nascom.nasa.gov/comet_ison/ * 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