STEREO Weekly Meeting Minutes for 2014-04-08 (Week 15) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 14 (Mar 31-Apr 6) * On day 091 (Apr 1), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 1026z. This anomaly resulted in the loss of one frame of SSR data. * On day 092 (Apr 2), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0603z for 2.0 hours * On day 093 (Apr 3), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 8.0 hours SWAVES (Part 13) remained 100% full at 2104z for 2.9 hours * On day 094 (Apr 4), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 18.3 hours PLASTIC (Part 17) remained 95% full at 0832z for 9.7 hours * On day 095 (Apr 5), the SECCHI instrument on Ahead reset at 17:12:25z. The SECCHI team reconfigured the instrument to operational mode at 2156z. This was the 34th reset of SECCHI on the Ahead spacecraft. * On day 092 (Apr 2), the 61st momentum dump on Behind was executed successfully at 1530z, which imparted a delta V of 0.0742 m/sec. * On day 093 (Apr 3), an Uplink Tracking and Command (UPL) v11.1 Project Interface Test (PIT) was conducted on Behind with DSS-25. The purpose was to validate DSN to Project functional interfaces with UPL V11.1 software. All test objectives were met successfully. Tracking, telemetry, and command data from this support was non-committed. * On day 095 (Apr 5), a Return-To-Service (RTS) engineering demo was conducted on Behind with DSS-63. The purpose was to validate X-band tracking performance after the completion of the depot level maintenance (DLM) and re-grouting activities. All test objectives were met successfully. Tracking, telemetry, and command data from this support was non-committed. * The average daily SSR playback volume during the week was 3.1 gigabits for Ahead, and 3.8 gigabits for Behind. Week 15 (Apr 7-13) * A Return-To-Service test with Ahead with station 63 was carried out successfully on Monday, Apr 7. * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 7, and Thursday, Apr 10, both using station 14 at 720 kbps. The following passes will be carried out at 160 kbps: Thursday, Apr 10 (D26), Saturday, Apr 12 (D55), and Sunday, Apr 13 (D65, D25). * Behind has 11 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Apr 8 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, Apr 8 (D26), Thursday, Apr 10 (D55, D25), Saturday, Apr 12 (D15), and Sunday, Apr 13 (D55, D26). The station 26 pass on Friday, Apr 11, will be carried out at 240 kbps. Week 16 (Apr 14-20) * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 14 (D63 at 720 kbps), Tuesday, Apr 15 (D63, D14 at 720 kbps), Wednesday, Apr 16 (D63), and Friday, Apr 18 (D43). The following passes will be carried out at 160 kbps: Thursday, Apr 17 (D55, D24), Friday, Apr 18 (D24), Saturday, Apr 19 (D15), and Sunday, Apr 20 (D55). * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for every day of the week except Friday, and all of the passes are carried out at 720 kbps except Sunday. The following passes will be carried out at 160 kbps: Thursday, Apr 17 (D25), Friday, Apr 18 (D55), Saturday, Apr 19 (D34), and Sunday, Apr 20 (D25). Week 17 (Apr 21-27) * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 21 (D63 at 720 kbps), Tuesday, Apr 22 (D63), Wednesday, Apr 23 (D14), Thursday, Apr 24 (D43), and Friday, Apr 25 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, Apr 24 (D55), Friday, Apr 25 (D55), Saturday, Apr 26 (D54, D25), and Sunday, Apr 27 (D54, D25). * Behind has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 21 (D63 at 720 kbps), Wednesday, Apr 23 (D43), and Sunday, Apr 27 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Wednesday, Apr 23 (D54), Thursday, Apr 24 (D54), Friday, Apr 25 (D55), Saturday, Apr 26 (D55, D15), and Sunday, Apr 27 (D55). The station 26 pass on Friday, Apr 25, will be carried out at 240 kbps. Week 18 (Apr 28-May 4) * The 67th momentum dump on Ahead is scheduled for Wednesday, Apr 30, with ignition at 15:00 UT. * Mercury will transit the disk as seen from Behind on Tuesday, Apr 29, from approximately 1:49-06:08 UT. SECCHI observations will cover a longer time to include the COR1 telescope. * Ahead has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Apr 29 (D14 at 720 kbsp, D43), Wednesday, Apr 30 (D43), Thursday, May 1 (D43 at 720 kbsp), and Sunday, May 4 (D63, D14, both at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Apr 28 (D54), Wednesday, Apr 30 (D55), and Friday, May 2 (D24). The station 26 pass on Saturday, May 3, will be carried out at 240 kbps. * Behind has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Apr 28 (D63 at 720), Wednesday, Apr 30 (D43, D14, both at 720 kbps), and Thursday, May 1 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, May 1 (D55, D24), Friday, May 2 (D55), Saturday, May 3 (D55, D25), and Sunday, May 4 (D55). The following station 26 passes will be carried out at 240 kbps: Tuesday, Apr 29, Friday, May 2, and Sunday, May 4. Week 19 (May 5-11) * The 62nd momentum dump on Behind is scheduled for Tuesday, May 6, with ignition at 23:30 UT. * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, May 6 (D63 at 720 kbps), and Saturday, May 10 (D43, D14 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, May 8 (D25), and Sunday, May 4 (D55). The station 26 pass on Friday, May 9, will be carried out at 240 kbps. * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 5 (D63 at 720 kbps), and Friday, May 9 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, May 6 (D25), Thursday, May 8 (D55, D24), and Saturday, May 10 (D55, D25). The station 26 pass on Sunday, May 11, will be carried out at 240 kbps. Week 20 (May 12-18) * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 12 (D14), Thursday, May 15 (D63 at 720 kbps), and Friday, May 16 (D43). The following passes will be carried out at 160 kbps: Tuesday, May 13 (D26), Wednesday, May 14 (D55), Thursday, May 15 (D25), and Saturday, May 17 (D55). The following station 26 passes will be carried out at 240 kbps: Wednesday, May 14, Friday, May 16, and Sunday, May 18. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, May 12 (D14 at 720 kbps), Friday, May 16 (D63), and Saturday, May 17 (D43). The following passes will be carried out at 160 kbps: Tuesday, May 13 (D54), Wednesday, May 14 (D54), Thursday, May 15 (D55, D25), Friday, May 16 (D25), Saturday, May 17 (D65), and Sunday, May 18 (D54). The station 26 pass on Saturday, May 17, will be carried out at 240 kbps. Other * The MOC will get back to the instrument teams with more information about conjunction planning. * The MOC is looking into some unusual roll jitter on the Behind spacecraft that begin on March 30, and slowly faded away. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 07 (097) Ahead: Return-to-service test with station 63 T Apr 08 (098) W Apr 09 (099) T Apr 10 (100) F Apr 11 (101) S Apr 12 (102) S Apr 13 (103) ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 14 (104) Ahead: COR2 long-exposure campaign T Apr 15 (105) Ahead: COR2 long-exposure campaign W Apr 16 (106) Ahead: COR2 long-exposure campaign T Apr 17 (107) F Apr 18 (108) S Apr 19 (109) S Apr 20 (110) ------------------------------------------------------------------------------- Scheduled activities for Week 17: M Apr 21 (111) T Apr 22 (112) W Apr 23 (113) T Apr 24 (114) F Apr 25 (115) S Apr 26 (116) S Apr 27 (117) ------------------------------------------------------------------------------- Scheduled activities for Week 18: M Apr 28 (118) T Apr 29 (119) Behind: Mercury transit W Apr 30 (120) Ahead: Momentum dump, 15:00 UT T May 01 (121) F May 02 (122) S May 03 (123) S May 04 (124) ------------------------------------------------------------------------------- Scheduled activities for Week 19: M May 05 (125) T May 06 (126) Behind: Momentum dump, 23:30 UT W May 07 (127) T May 08 (128) F May 09 (129) S May 10 (130) S May 11 (131) ------------------------------------------------------------------------------- Scheduled activities for Week 20: M May 12 (132) T May 13 (133) W May 14 (134) T May 15 (135) F May 16 (136) S May 17 (137) S May 18 (138) ------------------------------------------------------------------------------- Upcoming events: 2014: * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * Sep 21 MAVEN arrival at Mars * Oct 17 Behind: Comet Siding Spring encounter with Mars 2015: * Jan 14 - Mar 19 (TBC) Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * Feb 11 - Jul 08 (TBC) Ahead: Spacecraft behind Sun * Aug 25 - Oct 19 (TBC) Behind: Possible interference from Sun * Jul DAWN - End of nominal mission 2016: * Jul 5 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