STEREO Weekly Meeting Minutes for 2017-01-17 (Week 3) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally on the main lobe of the high gain antenna. * Attempts to recover Behind have transitioned back to a monthly schedule. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 2 (Jan 9-15) * On day 010 (Tuesday Jan 10), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently beginning at 2350z through 011-0045z. This anomaly resulted in the loss of 3307 frames of real-time and SSR data or 41 seconds of SSR playback data for each instrument. See DR# G117739 for more information. * On day 012 (Thursday Jan 12), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently beginning at 2302z through 2305z due to weather. This anomaly resulted in the loss of 10,276 frames of real-time and SSR data or 2.1 minutes of SSR playback data. See DR# G117745 for more information. * On day 012, the DSN delivered the corrected the tracking data for days 001 through 003 from DSS-14 to the FDF. Recall that the leap second was applied late at Goldstone, on day 004. For STEREO Ahead, this affected the first three days of tracking data, telemetry data, and timekeeping processing. See DR# N110457, N110458 and N110459 for more information. * On day 013 (Friday, Jan 13), the hard disk on the primary Ahead command workstation in the MOC was replaced. The MOC will resume operations on the primary command workstation next week after shadow testing is completed. The instrument teams will be notified as some may need to reconfigure to use a different real-time stream, #106, to continue receiving real-time telemetry. * On day 014 (Saturday, Jan 14), automated retrieval of DSN schedules and viewperiods, that has stopped on day 006 due to an SPS hardware upgrade, resumed after the DSN reset the account passwords. * On day 014, during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently beginning at 0056z through 0057z due to antenna brakes being set momentarily. This anomaly resulted in the loss of 962 frames of real-time and SSR data or 12 seconds of SSR playback data for each instrument. See DR# N110484 for more information. * The average daily science data return for Ahead was 5.7 Gbits during this week. * There were no tracks for Behind during the week. The next recovery attempts for Behind are on Jan 20-22. Week 3 (Jan 16-22) * The 95th momentum dump on Ahead is scheduled for Thursday, Jan 19, with ignition at 21:00 UT. This will be the 14th dump without using the gyros. * Federal government offices in the DC area will be closed on Friday, Jan 20, for the presidential inauguration. * Ahead has 8 passes during the week, and overall coverage is nominal. There are five passes at 720 kbps, two at 240 kbps, and one at 160 kbps. * Battery recovery tracks are on Friday, Jan 20, with station 14, and on Saturday, Jan 21, with the 80 kW transmitter on station 26. A carrier recovery track will be carried out with station 14 on Sunday, Jan 22. The radio science receiver will be used with the station 14 tracks. Week 4 (Jan 23-29) * Ahead has 9 passes during the week, and overall coverage is now nominal. There are currently six tracks at 720 kbps, one at 240 kbps, and two at 160 kbps. * Behind has no passes during the week. Week 5 (Jan 30-Feb 5) * Ahead has 12 tracks during the week, and overall coverage is nominal. There are five passes at 720 kbps, one at 360 kbps, three at 240 kbps, and three at 160 kbps. Two ESA Malargue passes were added for Jan 30,31. * Behind has no passes during the week. Week 6 (Feb 6-12) * A 1.6 hour project interface test with Ahead using station 26 is scheduled for Sunday, Feb 12, 22:25-00:00 UT. There will be no SSR playback or instrument commanding during this pass. The telemetry rate will be 240 kbps. * Ahead has 8 passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, one at 240 kbps, and one at 160 kbps. * There are no passes for Behind during the week. Week 7 (Feb 13-19) * A 1.5 hour project interface test with Ahead using station 63 is scheduled for Tuesday, Feb 14, 15:15-16:45 UT. There will be no SSR playback or instrument commanding during this pass. The telemetry rate will be 720 kbps. * The 96th momentum dump on Ahead is scheduled for Friday, Feb 17, with ignition at 19:30 UT. This will be the 15th dump without using the gyros. * Ahead has 9 passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, and two at 240 kbps. * Recovery attempts for Behind are scheduled for Friday, Saturday, and Sunday, Feb 17-19. The first two passes are for battery recovery, and will use the 80 kW transmitter on station 26. The carrier recovery track using station 14 on Sunday will include the radio science receiver. Week 8 (Feb 20-26) * Ahead has 11 passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, and three a 160 kbps. * There are no passes for Behind during the week. Week 9 (Feb 27-Mar 5) * Ahead has 11 passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, and one at 240 kbps. * There are no passes for Behind during the week. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 16 (016) Martin Luther King Day T Jan 17 (017) W Jan 18 (018) T Jan 19 (019) Ahead: Momentum dump, 21:00 UT F Jan 20 (020) Inauguration Day Behind: Battery recovery track with station 14 S Jan 21 (021) Behind: Battery recovery track with station 26 S Jan 22 (022) Behind: Carrier recovery track with station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 23 (023) T Jan 24 (024) W Jan 25 (025) T Jan 26 (026) F Jan 27 (027) S Jan 28 (028) S Jan 29 (029) ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 30 (030) T Jan 31 (031) W Feb 01 (032) T Feb 02 (033) F Feb 03 (034) S Feb 04 (035) S Feb 05 (036) ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 06 (037) T Feb 07 (038) W Feb 08 (039) T Feb 09 (040) F Feb 10 (041) S Feb 11 (042) S Feb 12 (043) Ahead: Project interface test with station 26 ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 13 (044) T Feb 14 (045) Ahead: Project interface test with station 26 W Feb 15 (046) T Feb 16 (047) F Feb 17 (048) Ahead: Momentum dump, 19:30 UT Behind: Battery recovery track with station 26 S Feb 18 (049) Behind: Battery recovery track with station 26 S Feb 19 (050) Behind: Carrier recovery track with station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 20 (051) T Feb 21 (052) W Feb 22 (053) T Feb 23 (054) F Feb 24 (055) S Feb 25 (056) S Feb 26 (057) ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 27 (058) T Feb 28 (059) W Mar 01 (060) T Mar 02 (061) F Mar 03 (062) S Mar 04 (063) S Mar 05 (064) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2017: 2018: * Mar 5 Ahead: Mercury transit 2019: * Mar Ahead: Switch downlink rate to 240 kbps for 34 meter * Apr Behind: Switch downlink rate to 240 kbps for 34 meter 2020: * May Behind: Switch downlink rate to 360 kbps for 34 meter * Jun Ahead: Switch downlink rate to 360 kbps for 34 meter * Jun Behind: Switch downlink rate to 480 kbps for 34 meter * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter 2021: * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter 2022: 2023: * May 5 Behind: Mercury transit * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth 2024: 2025: * Apr 7 Ahead: Mercury transit 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit