STEREO Weekly Meeting Minutes for 2010-06-01 (Week 22) ANNOUNCEMENTS ------------- INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 21 * Incidents during the APL commercial Power Loss (May 29-31): On Day 148 the MOC remote notification was degraded due to an unplanned Blackberry server outage at APL. Track and MOC operations were monitored remotely using VPN services. On day 150 at approximately 18:30 UT, APL to JPL RIONet links were switched to the backup links when the generator powering the primary link failed. Neither of these had an impact on STEREO. * On day 146 the MOps permanent macro release 1.1.4 was loaded to C&DH EEPROM and RAM on both spacecraft. This added an autonomy rule to free SSR space, due to longer track durations, during the science SSR playback to increase data return. * The average daily SSR playback was 4.7 gigabits for Ahead, and 3.2 gigabits for Behind. Ahead: * On day 150 the command up-link was 10 minutes late due to the transmitter tripping offline at 14:42 UT. The transmitter tripped again at 15:46 UT. The transmitter server was rebooted and the up-link was reestablished at 16:39 UT. This resulted in the loss of 63 minutes of commanding and tracking data and several minutes of SSR data for all instruments. * On day 150, during the station 25 pass, real-time telemetry and commanding were lost beginning at 18:42 UT due to a power outage at the Goldstone. Power was restored and the antenna re-established tracking at 19:17 UT. This resulted in the loss of 35 minutes of commanding and tracking data and several hours of SSR data for all instruments. * On DOY 146 at 09:25 UT, a SECCHI GT Calibration Offpoint event was conducted. Behind: * On day 144, the station 24 support did not occur as the maser receiver was red before BOT. No other stations were available. This resulted in the loss of more than a day of all SSR data. * On day 148, during the DSS 15, telemetry reception was 28 minutes late due a MOC procedural error. The S/C SSR playback was skipped and the science SSR playback was started 14 minutes early. * On day 150, during the station 15 support, real-time telemetry and commanding services were late beginning at 19:00 UT due the Goldstone a power outage. Power was restored and the antenna began tracking at 20:09 UT. This resulted in the loss of 69 minutes of commanding and tracking data and several hours of SSR data for all instruments. * On day 142, in-situ instruments SSR partitions began overwriting due to insufficient track coverage. Specifically, an eight hour cumulative track shortage beginning in the previous week, and 6.2 hour cumulative track shortage this week, with an unplanned track loss on day 144, resulted in intermittent loss of many hours of in-situ instrument SSR data beginning on day 142 through 148. The primary cause of the insufficient track time was sharing the same view with many other higher priority missions, including the Planet C launch. Week 22 * There will be a momentum dump on Ahead on Friday, Jun 4, starting at 14:00 UT. Week 23 * Monday June 7 - first track for Ahead on station 65 will be only 2.1 hours and will be used for science data download only. * Behind is expected to lose in-situ data starting on Day 160 (Jun 9) and continuing into the next week. Most tracks are only 5 hours in duration. Total track coverage is 10 hours short. Ahead coverage looks good. * Thursday, Jun 10 there will be two overlapping tracks for Ahead: Station 26 is the main track Station 25 is running a test during the same time period and should be ignored. * Friday June 11 ahead will have a 6.4 hour track on Station 63 with a 720 kbps data rate. * There will be a momentum dump on Behind on Jun 9, starting at 21:30 UT. Week 24 * Behind is 6.8 hours short in track coverage during the week. Many tracks are 5 hours long. Intermittent in-situ data gaps are expected through Jun 20. Ahead coverage looks good. Week 25 * Ahead - good track coverage Behind - enough track time, but spacing and durations may cause data loss. Week 26 * Ahead coverage good. Behind 1.4 hours short, but no data loss expected. * July 1 HGA calibration on Behind with 10 hour track. Ahead calibration the next week. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 31 (151) T Jun 01 (152) W Jun 02 (153) T Jun 03 (154) F Jun 04 (155) Ahead: Momentum dump, 14:00 UT S Jun 05 (156) S Jun 06 (157) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 07 (158) T Jun 08 (159) SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A W Jun 09 (160) Behind: Momentum dump, 21:30 UT T Jun 10 (161) F Jun 11 (162) S Jun 12 (163) S Jun 13 (164) ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 14 (165) T Jun 15 (166) W Jun 16 (167) T Jun 17 (168) F Jun 18 (169) S Jun 19 (170) S Jun 20 (171) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 21 (172) T Jun 22 (173) W Jun 23 (174) T Jun 24 (175) F Jun 25 (176) S Jun 26 (178) S Jun 27 (179) ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 28 (180) T Jun 29 (181) W Jun 20 (182) T Jul 1 (183) Behind: HGA Calibration F Jul 2 (184) S Jul 3 (185) S Jul 4 (186) ------------------------------------------------------------------------------- Upcoming events: 2010: SECCHI Stepped calibration rolls Ahead: Aug 10, Nov 2 Behind: Jul 13, Oct 12 * Jul 8,15 EIT shutterless (TBC) * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Aug 23 Ahead: End use of 720 kbps on 70 m DSN subnet * Sep 6 Behind: End use of 720 kbps on 70 m DSN subnet * Sep 7 Both: Begin 8 hour daily DSN tracks * Sep 13 Both: Switch downlink rate to 160 kbps * Nov 15 Behind: Switch downlink rate to 120 kbps 2011: * Jan 12 Both: HGA calibration * Feb 6 STEREO spacecraft at 180 degree separation * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul DAWN - Vesta arrival * Jul 13 Both: HGA calibration * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 9 Behind: End use of 480 kbps on 70 m DSN subnet * Jan 11 Both: HGA calibration * Jun 25 Ahead: End use of 480 kbps on 70 m DSN subnet * Jul DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug 20 Both: Switch downlink rate to 30 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * Nov 25 Behind: End use of 360 kbps on 70 m DSN subnet * Dec 12 Ahead: Mercury transit 2014: * Apr 29 Behind: Mercury transit 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * May 25 Ahead: End use of 360 kbps on 70 m DSN subnet * Aug 10 Ahead: Begin use of 360 kbps on 70 m DSN subnet * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission 2016: 2017: 2018: * Mar 5 Ahead: Mercury transit