STEREO Weekly Meeting Minutes for 2012-06-05 (Week 23) ANNOUNCEMENTS ------------- * Some internet maintenance activities will be occuring at the STEREO MOC tomorrow night (Jun 6), resulting in an approximately 5 minute interruption in network connectivity around 23:00 UTC (7 P.M. EDT) during a track for the Ahead spacecraft. Instrument teams may need to reconnect to the server after the interruption is over. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 22 (May 28-Jun 03) * On day 149 (May 28), during the DSS-63 support for Ahead, turbo decoder lock was lost briefly at 0704z. This anomaly resulted in the loss of 61 frames of SSR data. See DR# N108125 for more information. * On day 151 (May 30), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0559z. This anomaly resulted in the loss of one frame of SSR data. See DR# N108126 for more information. * On day 153 (Jun 1), during the DSS-65 support for Ahead, turbo decoder lock was lost briefly at 1206z. This anomaly resulted in the loss of 11 frames of SSR data. See DR# N108136 for more information. * On day 153 (Jun 1), during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 2209z. This anomaly resulted in the loss of one frame of SSR data. A DR has been requested. * On day 155 (Jun 3), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0546z. This anomaly resulted in the loss of one frame of SSR data. A DR has been requested. * On day 152 (May 31), the 47th momentum dump was successfully executed on Ahead at 1600Z, which imparted a delta V of 0.1006 m/sec. * On day 155 (Jun 3), during the DSS-45 support for Behind, the antenna was declared red due to a mechanical anomaly which resulted in the loss of the entire 5.3 hour support. During the next support, SSR pointers were repositioned to minimize data loss. This anomaly resulted in the loss 5.3 hours of command and tracking data. All SSR data were recovered. See DR# C108754 for more information. * On day 150, the 21st SECCHI stepped calibration on Behind, for perihelion in the orbit, was executed. * The average daily SSR playback volume during the week was 5.2 gigabits for Ahead, and 4.7 gigabits for Behind. Week 23 (Jun 4-10) * Ahead has 70 meter passes on Tuesday, Jun 5 (D14), Thursday, Jun 7 (D63), and Friday, Jun 8 (D63, D14 at 720 kbps). There are 10 passes during the week, and the overall coverage is nominal. The following passes will be carried out at 240 kbps: Monday, Jun 4 (D55, D25), Tuesday, Jun 5 (D25), Wednesday, Jun 6 (D34), Saturday, Jun 9 (D26), and Sunday, Jun 10 (D54). * Behind has 70 meter passes on Monday, Jun 4 (D63 at 720 kbps), Tuesday, Jun 5 (D63 at 720 kbps), Friday, Jun 8 (D43, D14 at 720 kbps), Saturday, Jun 9 (D63), and Sunday, Jun 10 (D63 at 720 kbps). There are 9 passes during the week, and the overall coverage is nominal. The station 25 passes on Wednesday, Jun 6 and Sunday, Jun 10 will be carried out at 240 kbps. Week 24 (Jun 11-17) * 42nd momentum dump for Behind is scheduled for Tuesday, Jun 12 with ignition at 15:00 UT. * Ahead has 70 meter passes on Monday, Jun 11 (D63), Tuesday, Jun 12 (D14 at 720 kbps), Wednesday, Jun 13 (D14), Friday, Jun 15 (D63 at 720 kbps), Saturday, Jun 16 (D63 at 720 kbps), and Sunday, Jun 17 (D63). There are 11 passes during the week, and the overall coverage is nominal. The station 54 pass on Thursday, Jun 14 will be carried out at 240 kbps. Passes with ESA's New Norcia station are scheduled for Wednesday, Jun 13, and Thursday, Jun 14. * Behind has 70 meter passes on Monday, Jun 11 (D63), Wednesday, Jun 13 (D14), Thursday, Jun 14 (D63), Saturday, Jun 16 (D43) and Sunday, Jun 17 (D63), all but the Saturday pass at 720 kbps. There are 10 passes during the week, and overall coverage is nominal. The station 54 pass on Tuesday, Jun 12, and the station 26 pass on Saturday, Jun 16 will both be carried out at 240 kbps. Week 25 (Jun 18-24) * Ahead has 70 meter passes Monday, Jun 18 (D14), Wednesday, Jun 20 (D14), Thursday, Jun 21 (D14), Friday, Jun 22 (D63 and D43), Saturday, Jun 23 (D14) and Sunday, Jun 24 (S63). There are 14 tracks total during the week, and overall coverage is nominal. * Behind has five 70 meter passes, Monday, Jun 18 (D43, D63 at 720 kbps), Wednesday, Jun 20 (D43), Saturday, Jun 23 (D63), Sunday, Jun 24 (D63). Station passes on Tuesday, Jun 19 on D34 and D54, and Friday, Jun 22 on D55 will be carried out at 240 kbps. There will be 12 tracks total during the week and overall coverage is nominal. Week 26 (Jun 25-Jul 1) * Ahead's 22nd SECCHI step calibration roll is scheduled for Tuesday, Jun 26, starting 02:20 UT. This is the midpoint roll. System momentum is projected to be about 4 N-m-s. * A leap second will be added on both spacecraft on Sunday, Jun 30 at 23:59:59 UT to keep them coordinated with UTC. Instruments will see this in their DPU. The difference between TAI and UTC will go from 34 to 35 seconds. * There will be a return-to-service track for station 25 on Behind on Sunday, Jul 1, for 3 hours starting at 16:55 UT. There will be no SSR playback nor instrument commanding during this track. * Ahead has 70 meter passes on Monday, Jun 25 (D63, D14), Tuesday, Jun 26 (D63 at 720 kbps, D14), Wednesday, Jun 27 (D63), Thursday, Jun 28 (D43 at 720 kbps, D14) and Saturday, Jun 30 (D63). The D55 pass on Sunday, Jul 1 will be at 240 kbps. There will be 12 tracks total during the week and overall coverage will be nominal. * Behind has 70 meter passes on Monday, Jun 25 (D63), Friday, Jun 29 (D63), Saturday, Jun 30 (D14) and Sunday, Jul 1 (D63) all at 480 kbps. Passes on Tuesday, Jun 26 on D24 and Wednesday, Jun 27 on D65 will be at 240 kbps. There are 12 tracks total during the week, and overall coverage is nominal. The previous telemetry shortage on Thursday, Jun 28 was alleviated by the addition of ESA New Norcia and Cebreros passes. Week 27 (Jul 2-8) * Wednesday, Jul 4 is an APL Holiday, so please coordinate real time support in advance. * Ahead has 70 meter tracks on Tuesday, Jul 3 (D14), Wednesday, Jul 4 (D14), Friday, Jul 6 (D43), and Saturday, Jul 7 (D63). The D65 track on Sunday, Jun 8 will be carried out at 240 kbps. There will be a total of 11 tracks during the week, and coverage will be nominal. * Behind has 70 meter tracks on Monday, Jul 2 (D63), Tuesday, Jul 3 (D63 at 720 kbps), Wednesday, Jul 4 (D14 at 720 kbps), and Thursday, Jul 3 (D43). The D24 track on Saturday, and D54 track on Sunday, will be at 240 kbps. There will be 11 tracks total during the week, and overall coverage will be nominal. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 04 (156) T Jun 05 (157) W Jun 06 (158) T Jun 07 (159) F Jun 08 (160) S Jun 09 (161) S Jun 10 (162) ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 11 (163) T Jun 12 (164) Behind: Momentum dump, 15:00 UT W Jun 13 (165) T Jun 14 (166) F Jun 15 (167) S Jun 16 (168) S Jun 17 (169) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 18 (170) T Jun 19 (171) W Jun 20 (172) T Jun 21 (173) F Jun 22 (174) S Jun 23 (175) S Jun 24 (176) ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 25 (177) T Jun 26 (178) Ahead: SECCHI stepped calibration roll, 2:20 UT W Jun 27 (179) T Jun 28 (180) F Jun 29 (181) S Jun 30 (182) S Jul 01 (183) Behind: Return-to-service track for station 25 ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 02 (184) T Jul 03 (185) W Jul 04 (186) Independence Day T Jul 05 (187) F Jul 06 (188) S Jul 07 (189) S Jul 08 (190) ------------------------------------------------------------------------------- Upcoming events: 2012: * 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