STEREO Weekly Meeting Minutes for 2014-02-11 (Week 07) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 06 (Feb 3-9) * On day 034, during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 0221z. This anomaly resulted in the loss of one frame of SSR data. * On day 034, during the DSS-34 support for Behind, turbo decoder lock was lost briefly at 0702z. This anomaly resulted in the loss of one frame of SSR data. * On day 037, during the DSS-63 support for Behind, turbo decoder lock was lost intermittently between 1708z and 1711z due to rain. This anomaly resulted in the loss of 1167 frames of SSR data. See DR# N109374 for more information. * On day 039, during the DSS-25 support for Behind, turbo decoder lock was lost briefly at 0108z. This anomaly resulted in the loss of three frames of SSR data. * On day 039, during the DSS-63 support for Behind, initial telemetry lock was established 95 minutes late due to a cable issue at the station. This anomaly resulted in the loss of 95 minutes of real-time telemetry (all SSR data was received since the commands to start recorder playback were issued from the ground once two-way lock was established). See DR #M107762 for more information. * On day 040, during the DSS-55 support for Behind, turbo decoder lock was lost intermittently between 1007z and 1012z, then again, briefly, at 1602z due to rain. This anomaly resulted in the loss of 355 frames of SSR data. See DR #N109382 for more information. * The full Reduced Gyro Operations (RGO) fault protection capability for the Behind observatory has been developed. Testing of the fault protection rules and load scripts has begun on the hardware simulator (flatsat). This will replace the temporary version that is currently on the BEHIND observatory by providing fault protection robustness, similar in concept to what is being used on the AHEAD observatory, with an enhancement to reduce the likelihood of unintended autonomous momentum dump firings. RGO extends the life of the remaining IMU by keeping it off most of the time and turning it on only when high rate data is required, such as the periodic momentum dumps, instrument roll calibrations, and spacecraft safety. * The average daily SSR playback volume the week was 4.0 Gbits for Ahead and 4.0 Gbits for Behind. Week 07 (Feb 10-16) * The 29th SECCHI step calibration on Ahead occurred on Tuesday Feb. 11 at 06:25 UT. This is the perihelion calibration, although the actual perihelion will occur Feb 24. The step call was done early because of system momentum considerations. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Feb 10 (D14), Tuesday, Feb 11 (D63), Wednesday, Feb 12 (D63), Friday, Feb 14 (D63), and Saturday, Feb 15 (D63). The station 45 pass on Friday, Feb 14, will be carried out at 160 kbps. * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Feb 10 (D63 at 720 kbps), and Wednesday, Feb 12 (D14). The following passes will be carried out at 160 kbps: Thursday, Feb 13 (D15), and Friday, Feb 14 (D24). Week 08 (Feb 17-23) * The 65th momentum dump on Ahead is scheduled for Wednesday, Feb 19, with ignition at 18:30 UT. * Ahead has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Feb 17 (D14), Wednesday, Feb 19 (D14 at 160 kbps), 160 Friday, Feb 21 (D63), and Sunday, Feb 23 (D63). The D34 on Wednesday, Feb 19 and D26 pass on Saturday, Feb 22, will be carried out at 160 kbps. * Behind has 15 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Feb 18 (D63). The following passes will be carried out at 160 kbps: Tuesday, Feb 18 (D24), Friday, Feb 21 (D25), and Sunday, Feb 23 (D55, D25). Week 09 (Feb 24-Mar 2) * Perihelion for Ahead occurs on Monday, Feb 24. * The 60th momentum dump for Behind is scheduled for Thursday, Feb 27, with ignition at 00:30 UT. The time of the momentum dump was changed due to the DSN schedule. * Ahead has 11 tracks during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Feb 24 (D43 at 720 kbps), Wednesday, Feb 26 (D14 at 720 kbps), and Friday, Feb 28 (D14). The D26 pass on Tuesday, Feb 25, is at 160 kbps, and on Sunday, Mar 2, is at 240 kbps. * Behind has 13 tracks during the week, and overall coverage is nominal. There are four 70 meter tracks. They are on Monday Feb 24, Tuesday, Feb 25, Friday, Feb 28 and Sunday, Mar 2, with the Friday and Sunday tracks downlinking at 720 kbps. The following passes, all on D26, will be carried out at 160 kbps: Monday, Feb 24 and Wednesday Feb. 26 There will be two ESA passes on Malargüe, on Wednesday, Feb. 26 and Thursday Feb. 27. Week 10 (Mar 3-9) * Daylight saving time in the U.S. begins Mar 9. * Ahead has 11 passes during the week, and overall coverage is short 14 hours, mainly between Tuesday-Thursday, Mar 4-6. 70 meter tracks are scheduled for Monday, Mar 3 (D14), and Thursday, Mar 6 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, Mar 6 (D55), Saturday, Mar 8 (D34, D55, D26), and Sunday, Mar 9 (D45). * Behind has 13 passes during the week, and overall coverage is short 7.5 hours, mainly between Tuesday-Friday, Mar 4-7. There is one 70 meter pass on Thursday, Mar 6. Passes will be conducted at 160 kbps on the following dates: Monday, Mar 3 (D45, D26), Wednesday, Mar 5 (D26, D55), Thursday, Mar 6 (D26), Friday, Mar 7 (D26), and Saturday, Mar 8 (D26). Week 11 (Mar 10-16) * Ahead has 11 passes during the week, and overall coverage is short 12.9 hours, mainly between Monday-Friday, Mar 10-14. A 70 meter pass is scheduled for Tuesday, Mar 11 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Mar 10 (D34), Friday, Mar 14 (D55 and D24), and Sunday, Mar 16 (D45). * Behind has 14 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Mar 12, and Friday, Mar 14 (D43 at 720 kbps). The following passes will be carried out at 160 kbps, all using station 26: Monday, Mar 10, Thursday, Mar 13, and Sunday, Mar 16. Other * A notice about operations during the solar conjunctions was sent out and people responded with lots of good comments and questions. A telecon will be scheduled to talk about it. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 10 (041) T Feb 11 (042) Ahead: SECCHI stepped calibration roll, 06:25 UT W Feb 12 (043) T Feb 13 (044) F Feb 14 (045) S Feb 15 (046) S Feb 16 (047) ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 17 (048) T Feb 18 (049) W Feb 19 (050) Ahead: Momentum dump, 18:30 UT T Feb 20 (051) F Feb 21 (052) S Feb 22 (053) S Feb 23 (054) ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 24 (055) Ahead: Perihelion T Feb 25 (056) W Feb 26 (057) T Feb 27 (058) Behind: Momentum dump, 00:30 UT F Feb 28 (059) S Mar 01 (060) S Mar 02 (061) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 03 (062) T Mar 04 (063) W Mar 05 (064) T Mar 06 (065) F Mar 07 (066) S Mar 08 (067) S Mar 09 (068) Daylight saving time starts Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 10 (069) T Mar 11 (070) W Mar 12 (071) T Mar 13 (072) F Mar 14 (073) S Mar 15 (074) S Mar 16 (075) Notes: * Significant telemetry shortages are expected for Ahead during the week. ------------------------------------------------------------------------------- Upcoming events: 2014: * Apr 29 Behind: Mercury transit * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * 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 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