STEREO Weekly Meeting Minutes for 2017-01-31 (Week 5) ANNOUNCEMENTS ------------- * The subsystem telemetry assesment review for Behind will be held at APL on Feb 24. See below for details. 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 4 (Jan 23-29) * On day 024 (Jan 24), during the DSS-14 support for Ahead, the MOC connection to the DSN was lost at 2206z due to a DSN firewall issue. Connectivity was restored at 2238z. This anomaly resulted in the loss of 32 minutes of commanding, real-time telemetry and monitor data. All SSR data were recovered. See DR# N110516 for more information. * On day 028 (Jan 28), during the DSS-14 support for Ahead, the uplink was delayed 12 minutes due to a transmitter low output power issue. The transmitter was recalibrated for 20 kW and the uplink was reswept at 2034z. This anomaly resulted in the loss of 12 minutes of commanding and two-way tracking data and 2445 frames of SSR and real-time data. See DR# G117802 for more information. * The average daily science data return for Ahead was 5.3 Gbits during this week. * The next recovery attempt for Behind is scheduled for Feb 17-19. A subsystem telemetry review will be held at APL on Feb 24. 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 of the 160 kbps passes are ESA Malargue passes on Jan 30,31. * Behind has no passes during the week. Week 6 (Feb 6-12) * On Monday, Feb 6, the MOC will be loading a G&C parameter to RAM to select the B thruster set (rather than A) for autonomous momentum dumps. * 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 radio science receiver will be used for all three tracks. Week 8 (Feb 20-26) * On Monday, Feb 20, G&C Memory Object Release 1.3.5 will be loaded to G&C EEPROM. * The subsystem telemetry assesment review for Behind will be held at APL on Friday, Feb 24, in building 200, starting at 9:00. Invitations have been sent out, and include WebEx information. Please contact the MOC if you need a badge. * Ahead has 11 passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, and three at 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. Week 10 (Mar 6-12) * Daylight Savings time in the US begins on March 12. * Ahead has 9 passes during the week, and overall coverage is nominal. There are seven passes at 720 kbps, one at 240 kbps, and one at 160 kbps. * There are no passes for Behind during the week. Week 11 (Mar 13-19) * The 38th SECCHI stepped calibration roll is scheduled for Thursday, Mar 16, starting at 13:50 UT. The system momentum is expected to be 6 N-m-s. This will be the 7th roll without using the gyros. * Ahead has 10 passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, one at 240 kbps, and one at 160 kbps. * Recovery attempts for Behind are scheduled for Friday, Saturday, and Sunday, Mar 17-19. The first two passes are for battery recovery, and will use the 80 kW transmitter on station 26. The radio science receiver will be used for all three tracks. Other * The SSC remarked that the current DSN schedule appears to show that the winter contention period with other missions seems to be over now, and suggests that IMPACT look into increasing their telemetry rate. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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) Behind: Subsystem telemetry review 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) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 06 (065) T Mar 07 (066) W Mar 08 (067) T Mar 09 (068) F Mar 10 (069) S Mar 11 (070) S Mar 12 (071) Daylight savings time begins ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 13 (072) T Mar 14 (073) W Mar 15 (074) T Mar 16 (075) Ahead: SECCHI calibration roll, 13:50 F Mar 17 (076) Behind: Battery recovery track with station 26 S Mar 18 (077) Behind: Battery recovery track with station 26 S Mar 19 (078) Behind: Carrier recovery track with station 14 ------------------------------------------------------------------------------- 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