STEREO Weekly Meeting Minutes for 2010-08-17 (Week 33) ANNOUNCEMENTS ------------- * The network at APL will be upgraded on Saturday, Sep 11, from 12:00-13:30 UT. The MOC will be unreachable via email or pagers during this time, but cell phones will still work. Spacecraft operations will be unaffected. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 32 * The station 25 transmitter went offline at 14:43 UT during the Ahead pass on day 225 (Aug 13). The transmitter was reenabled at 15:52 UT. This resulted in the loss of 69 minutes of commanding and tracking data, and several minutes of SSR data. * The 14th SECCHI stepped calibration roll on Ahead was carried out on day 222 (Aug 10) starting at 08:10 UT. This was the midpoint roll. * The average daily SSR downlink was 5.1 gigabits on Ahead and 4.6 gigabits on Behind. Week 33 * There are a number of tracks on Ahead during the week, ranging from 3-7 hours in length. * Ahead will have a 70 meter track on day 231, Thursday, Aug 19, using station 63 in Madrid. This track will be carried out at 720 kbps and last 3 hrs. No spacecraft telemetry will be downloaded during this tracks. * Behind will have a 70 meter track on Saturday, Aug 21 using station 43 in Canberra. This track will be carried out at 720 kbps and last just over 6 hours * Overall track coverage for Ahead is 4.7 hours above nominal during the week. For Behind it is 3.1 hours below nominal, but no in situ data are expected to be lost. Week 34 * Ahead will have a 70 meter track on Thurs. Aug 26 using station 63 in Madrid. This track will be carried out at 720 kbps and will last 3 hrs. No spacecraft telemetry will be read out during this track. * Behind will have a 70 meter track on Sunday Aug 29 using station 43 in Canberra. This track will be carried out at 720 kbps. Track duration is about 7 hours. * Overall track coverage during the week is 1.4 hours above nominal for Ahead, and 3.3 hours above nominal for Behind. Week 35 * Momentum dump #32 for Ahead during the week is scheduled for Aug 31, starting at 13:30 UT. * There will be a 70 meter track for Ahead on day 243 (Aug 31), and again on day 246 (Sep 3), and a 70 meter track for Behind on day 244 (Sep 1), all using station 63 in Madrid. These tracks will be carried out at 720 kbps. No spacecraft telemetry will be read out during the Ahead track on day 246 (Sep 3). * There will be a shadow track for Ahead on Sep 4 using station 15. This will test the upcoming CDR replacement. * Track coverage for Ahead is 3.8 hours above nominal, while track coverage for Behind is even. Week 36 * Ahead and Behind were originally scheduled to go to 8 hour track schedules this week, but that has now been pushed back to spring or summer of next year. The track coverage for weeks 36,37,38 have been undergoing adjustments to give some of this time back. This adjustment is generally done about 3 weeks ahead of time. * A Project Interface Test (PIT) has been scheduled for Ahead on Wednesday, day 251 (Sep 8) to test a new interface. A second PIT test is scheduled on Friday, day 253 (Sep 10). No SSR data will be downloaded during these tests, and no POC commanding will be performed. No in situ data should be lost because of these tests. Because there is a lot of coverage during the week, SECCHI data volume shouldn't be affected. * There are a number of 70 meter stations scheduled during the week. These tracks will be carried out at 720 kbps. 70 meter tracks for Ahead occur on days 249 (Sep 6), 252 (Sep 9) and 255 (Sep 12), all using station 63 in Madrid. Behind has 70 meter tracks on day 250 (Sep 7) using station 43 in Canberra, and on day 253 (Sep 10) using station 63 in Madrid. * The network at APL will be upgraded on Saturday, Sep 11, from 12:00-13:30 UT. The MOC will be unreachable via email or pagers during this time, but cell phones will still work. Spacecraft operations will be unaffected. * The 26th momentum dump on Behind will be carried out on day 250 (Sep 7), starting at 22:30 UT, during an 8 hour pass. * Overall coverage during the week for Ahead is even, and 1.2 hours above nominal for Behind. * Monday is the Labor Day holiday. Week 37 * Ahead has 720 kbps passes using station 63 on Monday, day 256 (Sep 13), Wednesday, day 258 (Sep 15), and Saturday, day 261 (Sep 18). * Behind has a 720 kbps pass on day 256 (Sep 13) using station 63. No spacecraft telemetry will be downlinked during this pass. * Overall coverage for the week is 1 hour over nominal for Ahead, and 7 hours over nominal for Behind. Week 38 * Ahead will have 720 kbps passes using station 63 on Tuesday, day 264 (Sep 21), and Friday, day 267 (Sep 24). There will be another 720 kbps on day 267 (Sep 24) using station 43. * Behind will have a 720 kbps pass on Wednesday, day 265 (Sep 22) using station 63 in Madrid. * Overall coverage is 7.8 hours over nominal for Ahead, and 7.1 hours over nominal for Behind. Other * There was some discussion about generating extra telemetry files for SECCHI SSR2 data. When the SECCHI instrument detects a CME, the contents of the SSR2 partition are frozen until all the data can come down. Sometimes this partition still has some telemetry in it when the last normal telemetry file is made. This happened for the CME event on Aug 7, and the SECCHI team requested that an additional telemetry file be generated to include all the SSR2 data. This was done, and the MOC is discussing how to best handle this in the future. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 33: M Aug 16 (228) T Aug 17 (229) W Aug 18 (230) T Aug 19 (231) Ahead: 720 kbps downlink on station 63 F Aug 20 (232) S Aug 21 (233) Behind: 720 kbps downlink on station 43 S Aug 22 (234) ------------------------------------------------------------------------------- Scheduled activities for Week 34: M Aug 23 (235) T Aug 24 (236) W Aug 25 (237) T Aug 26 (238) Ahead: 720 kbps downlink on station 63 F Aug 27 (239) S Aug 28 (240) S Aug 29 (241) Behind: 720 kbps downlink on station 43 ------------------------------------------------------------------------------- Scheduled activities for Week 35: M Aug 30 (242) T Aug 31 (243) Ahead: 720 kbps downlink on station 63 Ahead: Momentum dump, 13:30 UT W Sep 01 (244) Behind: 720 kbps downlink on station 63 T Sep 02 (245) F Sep 03 (246) Ahead: 720 kbps downlink on station 63 S Sep 04 (247) Ahead: Shadow track on station 15 for testing S Sep 05 (248) ------------------------------------------------------------------------------- Scheduled activities for Week 36: M Sep 06 (249) Ahead: 720 kbps downlink on station 63 T Sep 07 (250) Behind: 720 kbps downlink on station 43 Behind: Momentum dump, 22:30 UT W Sep 08 (251) Ahead: PIT test T Sep 09 (252) Ahead: 720 kbps downlink on station 63 F Sep 10 (253) Behind: 720 kbps downlink on station 63 Ahead: PIT test S Sep 11 (254) S Sep 12 (255) Ahead: 720 kbps downlink on station 63 ------------------------------------------------------------------------------- Scheduled activities for Week 37: M Sep 13 (256) Ahead: 720 kbps downlink on station 63 Behind: 720 kbps downlink on station 63 T Sep 14 (257) W Sep 15 (258) Ahead: 720 kbps downlink on station 63 T Sep 16 (259) F Sep 17 (260) S Sep 18 (261) Ahead: 720 kbps downlink on station 63 S Sep 19 (262) ------------------------------------------------------------------------------- Scheduled activities for Week 38: M Sep 20 (263) T Sep 21 (264) Ahead: 720 kbps downlink on station 63 W Sep 22 (265) Behind: 720 kbps downlink on station 63 T Sep 23 (266) F Sep 24 (267) Ahead: 720 kbps downlink on station 63, and on station 43 S Sep 25 (268) S Sep 26 (269) ------------------------------------------------------------------------------- Upcoming events: 2010: SECCHI Stepped calibration rolls Ahead: Nov 2 Behind: Oct 12 2011: * Spring/Summer Ahead: End use of 720 kbps on 70 m DSN subnet * Spring/Summer Behind: End use of 720 kbps on 70 m DSN subnet * Jan 12 Both: HGA calibration * Feb 6 STEREO spacecraft at 180 degree separation * Jun 27 Ahead: Switch downlink rate to 160 kbps * Jul 15 Behind: Switch downlink rate to 160 kbps * 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: * Apr 29 Behind: Mercury transit 2015: * Feb DAWN - Ceres arrival * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar 17 - Jul 14 (TBC) Ahead: Spacecraft behind Sun * Aug 25 - Oct 19 (TBC) Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission 2016: 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