STEREO Weekly Meeting Minutes for 2010-09-21 (Week 38) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 37 * Turbo lock was lost momentarily during the Ahead pass on station 63 on day 258 (Sep 15) due to an equipment anomaly at the station. This resulted in the loss of 40 frames of telemetry. * The station 24 antenna stopped tracking for 51 minutes during the Behind pass on day 259 (Sep 16) due to the loss of commercial power. The switchover to generator power did not happen automatically. This resulted in the loss of about 1 hour of SSR data for all instruments. * The average daily SSR downlink was 5.8 gigabits for Ahead, and 5.0 gigabits for Behind. Week 38 * MOC data was unavailable during the station 26 pass for Ahead yesterday (Sep 20). This was traced to a network problem at Goddard. Instrument SSR telemetry was unaffected. * There was a shadow track for Behind yesterday using station 47 at the same time as a station 45 track. This did not affect operations. * There will be a return-to-service track for station 65 on Ahead tomorrow (Sep 22). This will overlap with the Madrid pass on station 55. The MOC will be able to see the telemetry during the pass, but will otherwise will not use the pass. * Ahead will have 720 kbps passes using station 63 on Tuesday, day 264 (Sep 21), Thursday, day 266 (Sep 23), and Friday, day 267 (Sep 24). There will be another 720 kbps on day 267 (Sep 24) using station 43. Overall, there are 14 tracks for Ahead during the week. * Behind will have a 720 kbps pass on Wednesday, day 265 (Sep 22) using station 63 in Madrid. Overall, there are 14 tracks for Behind during the week. * Overall coverage is 3.25 hours over nominal for Ahead, and 2 hours over nominal for Behind. Week 39 * Sep 30 marks the end of the first extended mission. * Ahead has 720 kbps tracks on Monday, Sep 27, Wednesday (Sep 29), Friday (Oct 1), and Saturday (Oct 2), all using station 63 in Madrid. Overall, there are 14 tracks for Ahead during the week. * There are no 720 kbps tracks for Behind during the week. Overall, there are 12 tracks for Behind during the week. * Overall coverage is 4.5 hours over nominal for Ahead, and 4.2 hours over nominal for Behind. Week 40 * There will be a return-to-service track for station 14 on Ahead on Oct. 8. This will overlap with a station 25 track. The MOC will be able to see the telemetry during the pass, but will otherwise will not use the pass. * Ahead has 720 kbps tracks on Tuesday 278 and Thursday 280. Overall, there are 14 tracks for Ahead during the week. * There are no 720 kbps tracks for Behind during the week. Overall, there are 12 tracks for Behind during the week. * There will be a SECCHI aphelion stepped calibration on Behind on Oct 12, starting at 11:15 UT. * Overall coverage is 2.6 hours over nominal for Ahead, and 3.2 hours over nominal for Behind. Week 41 * Week 41 APL will reconfigure the restricted IONet, moving it to a new MOC in preparation for RBSP. Times blocked out for this activity are 12:00-21:00 UT Monday-Thursday, but it may not take that long. This may lead to problems during Ahead tracks on Oct. 11, 13, and 14. The last two hours of the track are affected on Oct 11 and 14, while the 70 meter track on Oct 13 is during the scheduled downtime. Soft command loss timers will be disabled on both spacecraft for several days. The MOC is looking into if it is possible to send up prerecorded commands stored at the DSN. The 70 meter track will be carried out at 720 kbps, but commanding may not be available. * On Oct. 15 there will be a momentum dump on Ahead, starting at 14:00 UT. * Aphelion for Behind is Oct 16. * There will be no 720 kbps tracks for Behind this week and 10 tracks overall. Ahead will have 13 tracks overall. * Days 288-289 (Oct 15-16) there will be a 32 hour gap in coverage for Behind but we should be able to ride over it. * Overall coverage is 6.0 hours over nominal for Ahead, and 1.3 hours over nominal for Behind. Week 42 * There will be a 720 kbps track for Ahead on Friday, Oct 22. There will be 12 tracks overall. * There will be no 720 kbps tracks for Behind this week and 14 tracks overall. * Overall coverage is 3.25 hours over nominal for Ahead, and 2.75 hours over nominal for Behind. Week 43 * Oct 26 is the fourth anniversary of the launch of STEREO. * There will be a 720 kbps track for Ahead on Wednesday, Oct 27. There will be 14 tracks overall. * There will be 720 kbps tracks for Behind on Monday and Tuesday, Oct 25-26. There will be 12 tracks for Behind overall. * There will be a momentum dump for Behind on Thursday Oct. 28, starting at 17:30 UT. * Overall coverage is 2.5 hours over nominal for Ahead, and 1.6 hours over nominal for Behind. Other * The current scheduling process is favoring multiple shorter passes per day instead of a single long pass. This gives more flexibility in the planning process. The instrument teams report that this is working well for them. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 38: M Sep 20 (263) T Sep 21 (264) Ahead: 720 kbps downlink on station 63 W Sep 22 (265) Ahead: Return-to-service track on station 65 Behind: 720 kbps downlink on station 63 T Sep 23 (266) Ahead: 720 kbps downlink on station 63 F Sep 24 (267) Ahead: 720 kbps downlink on station 63, and on station 43 S Sep 25 (268) S Sep 26 (269) ------------------------------------------------------------------------------- Scheduled activities for Week 39: M Sep 27 (270) Ahead: 720 kbps downlink on station 63 T Sep 28 (271) W Sep 29 (272) Ahead: 720 kbps downlink on station 63 T Sep 30 (273) End of extended mission #1 F Oct 01 (274) Ahead: 720 kbps downlink on station 63 S Oct 02 (275) Ahead: 720 kbps downlink on station 63 S Oct 03 (276) ------------------------------------------------------------------------------- Scheduled activities for Week 40: M Oct 04 (277) T Oct 05 (278) Ahead: 720 kbps downlink on station 63 W Oct 06 (279) T Oct 07 (280) Ahead: 720 kbps downlink on station 63 F Oct 08 (281) Ahead: Return-to-service track on station 14 Behind: SECCHI stepped calibration roll, 11:15 UT S Oct 09 (282) S Oct 10 (283) ------------------------------------------------------------------------------- Scheduled activities for Week 41: M Oct 11 (284) IONet down 12-21 UT T Oct 12 (285) IONet possibly down 12-21 UT W Oct 13 (286) IONet possibly down 12-21 UT, Ahead: 720 kbps downlink on station 43 T Oct 14 (287) IONet possibly down 12-21 UT F Oct 15 (288) Ahead: Momentum dump, 14:00 UT S Oct 16 (289) Behind: Aphelion S Oct 17 (290) ------------------------------------------------------------------------------- Scheduled activities for Week 42: M Oct 18 (291) T Oct 19 (292) W Oct 20 (293) T Oct 21 (294) F Oct 22 (295) Ahead: 720 kbps downlink on station 63 S Oct 23 (296) S Oct 24 (297) ------------------------------------------------------------------------------- Scheduled activities for Week 43: M Oct 25 (298) Behind: 720 kbps downlink on station 43 T Oct 26 (299) Behind: 720 kbps downlink on station 43 W Oct 27 (300) Ahead: 720 kbps downlink on station 63 T Oct 28 (301) Behind: Momentum dump, 17:30 UT F Oct 29 (302) S Oct 30 (303) S Oct 31 (304) ------------------------------------------------------------------------------- Upcoming events: 2010: SECCHI Stepped calibration rolls Ahead: Nov 2 2011: * Jan 12 Both: HGA calibration * Feb 6 STEREO spacecraft at 180 degree separation * Jun 27 Ahead: Switch downlink rate to 160 kbps * Jun 27 Ahead: End use of 720 kbps on 70 m DSN subnet * Jul 15 Behind: Switch downlink rate to 160 kbps * Jul 15 Behind: End use of 720 kbps on 70 m DSN subnet * Mar 18 Messenger - Mercury orbital insertion * Jul DAWN - Vesta arrival * Jul 13 Both: HGA calibration 2012: * Jan 11 Both: HGA calibration * Jul DAWN - Vesta departure * Jul 11 Both: HGA calibration * Nov 4 Behind: Switch downlink rate to 120 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * May 3 Ahead: Switch downlink rate to 120 kbps * Dec 12 Ahead: Mercury transit 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 * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet 2015: * Feb DAWN - Ceres arrival * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * 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 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