STEREO Weekly Meeting Minutes for 2014-04-01 (Week 14) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 13 (Mar 24-30) * On day 084 (Mar 25), during the DSS-24 support for Ahead, no commanding or ranging was conducted due to a transmitter problem. See DR #G114870 for more information. * On day 085 (Mar 26), during the DSS-14 support for Ahead, turbo decoder lock was lost briefly at 2011z and again at 2122z due to high winds at the station. This anomaly resulted in the loss of 174 frames of SSR data. See DR #G114873 for more information. * On day 088 (Mar 29), during the DSS-55 support for Ahead, turbo decoder lock was lost intermittently beginning at 0804z through 1014z. This anomaly resulted in the loss of four frames of SSR data. * On day 083 (Mar 24), the G&C parameter imu_gyrodrift was set to a static (average) value in RAM on both spacecraft. This parameter was routinely updated by MOps on a weekly basis; however this is no longer necessary due to the transition to Reduced Gyro Operations. * On day 085 (Mar 26), the 66th momentum dump on Ahead was executed successfully at 2130z, which imparted a delta V of 0.0931 m/sec. * On day 084 (Mar 25), the 28th SECCHI stepped calibration on Behind was executed at 1640z for the midpoint in the orbit. * On day 086 (Mar 27), MOps permanent macro release 1.1.19 was copied from C&DH RAM to EEPROM on Behind. Also, fault protection release 2.3.13 was loaded to C&DH EEPROM. Both of these releases contain autonomy rules and macros used to support Reduced Gyro Operations. * The average daily SSR playback volume during the week was 3.1 gigabits on Ahead, and 4.0 gigabits on Behind. Week 14 (Mar 31-Apr 6) * The 61st momentum dump on Behind is scheduled for tomorrow, Apr 2, starting at 15:30 UT. * A Project Interface Test (PIT) with station 25 is scheduled for Behind on Thursday, Apr 3. There will be no instrument commanding or SSR playback during this test. * A Return-To-Service test with Behind with station 63 is scheduled for Saturday, Apr 5. There will be no instrument commanding or SSR playback during this test. * Ahead has 12 passes during the week, and overall coverage is short 11.3 hours, mainly between Monday-Thursday, Mar 31-Apr 3. 70 meter passes are scheduled for Friday, Apr 4 (D14 at 720 kbps), and Sunday, Apr 6 (D43). The following passes will be carried out at 160 kbps, all using station 26: Monday, Mar 31, Wednesday, Apr 2, and Saturday, Apr 5. The station 26 pass on Sunday, Apr 6, will be carried out at 240 kbps. * Behind has 9 passes during the week, and overall coverage is short 4.6 hours, mainly between Wednesday-Thursday, Apr 2-3. 70 meter passes are scheduled for Monday, Mar 31 (D14 at 720 kbps), and Sunday, Apr 6 (D43). The following passes will be carried out at 160 kbps: Tuesday, Apr 1 (D26), and Wednesday, Apr 2 (D55). Week 15 (Apr 7-13) * A Return-To-Service test with Ahead with station 63 is scheduled for Monday, Apr 7. There will be no instrument commanding or SSR playback during this test. * 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), an Saturday, May 10 (D55, D25). The station 26 pass on Sunday, May 11, will be carried out at 240 kbps. Other * Planning for the DSN contacts during the solar conjunction periods has begun. Five hour daily passes with 70 meter stations have been requested for the periods where the elongation is between 1.5 and 3 degrees on both entry and exit. * There are some new MOC data products which need to be ported to the SSC website. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Mar 31 (090) T Apr 01 (091) W Apr 02 (092) Behind: Momentum dump, 15:30 UT T Apr 03 (093) Behind: PIT test with station 25 F Apr 04 (094) S Apr 05 (095) Behind: Return-to-service test with station 63 S Apr 06 (096) Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- 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) T Apr 15 (105) W Apr 16 (106) 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) ------------------------------------------------------------------------------- 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