STEREO Weekly Meeting Minutes for 2019-01-02 (Week 1) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. * Four years after the initial loss of communications anomaly with the Behind observatory, NASA has directed to cease periodic recovery operations with the last support on October 17, 2018. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 51 (Dec 17-23) * On day 351 (Dec 17), during the DSS-63 support for Ahead, initial acquisition of telemetry was delayed 21 minutes, at 1231z, to correct an uplink equipment issue at the station. SSR pointers were repositioned to prevent data loss. This anomaly resulted in the loss of 16 minutes of commanding and 21 minutes of real-time telemetry and two-way tracking data. All SSR data were received. See DR# M111060 for more information. * On day 352 (Dec 18), for the DSS-63 support for Ahead, no uplink was available as the transmitter was declared red due to a microwave controller issue. This anomaly resulted in the loss of 3.2 hours of commanding and two-way tracking data. All SSR data were received. See DR# M111066 for more information. * On day 352 (Dec 18), the fourth acceptance test of the CCSDS SLE bluebook version 4 software update between the Ahead MOC with DTF-21 was conducted. SLE telemetry and command binds were successful. All monitor data, ground system status data and spacecraft telemetry were received without issue. Six No-ops and two critical commands were sent successfully. One additional test to conduct acceptance test procedures will be scheduled. * On day 353 (Dec 19), during the ESA Cebreros (DSS-83) support for Ahead, an ESA ground station software patch for the CCDSD BD command service, for short critical commands, was tested satisfactory. * On day 355 (Dec 21), the scheduled 3.6 hour in duration 70m support for Ahead with DSS-63 for day 355 was cancelled due to emergency maintenance on the station uplink equipment. * On day 357 (Dec 23), during the DSS-63 support for Ahead, the transmitter was disabled 17 minutes early at 1828z due to implementation of a temporary elevation mask for safety of the crews constructing the new DSS-53 & 56 stations. This anomaly resulted in the loss of 17 minutes of commanding and twoway tracking data. All SSR data were received. See DR# M111080 for more information. * On day 353 (Dec 19), the 115th momentum dump on Ahead was executed successfully at 1700z, which imparted an estimated delta V of 0.086 m/sec. This was the 34th momentum dump that did not use the IMU. After thruster operations completed, there was a 0.87 degree of roll angle error. Fine pointing stabilized 2.5 minutes after completion of the momentum dump. * On day 353 (Dec 19), PLASTIC loaded time tagged commands on Ahead to reduce the deflection power supply current. * On day 356 (Dec 22), the SECCHI SSR1 science partition (#19) on Ahead reached 100% full at 0013z for 49 minutes due to the cancellation of the DSS-63 support on day 355. * The average daily science data return for Ahead was 5.7 Gbits during this week. Week 52 (Dec 24-30) * On day 360 (Dec 26), during the DSS-34 support for Ahead, turbo decoder lock was lost briefly at 0139z. This anomaly resulted in the loss of three frames of real-time telemetry and SSR data. * On day 358 (Dec 24), the SECCHI SSR1 science partition (#19) on Ahead reached 100% full at 0016z for 6.3 hours due to the cancellation of the DSS-63 support on day 355. * The average daily science data return for Ahead was 5.6 Gbits during this week. Week 1 (Dec 31-Jan 6) * Tomorrow (Jan 3), the Ahead spacecraft resumes emergency rates of 120 bps upload and 633 bps download, using the LGA with a 70 meter station. * The fourth SLE test with ESA is scheduled for Friday, Jan 4, starting at 15:05 UT. * Ahead has eleven passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, two at 360 kbps, and one at 160 kbps. Week 2 (Jan 7-13) * The fifth SLE test with the DSN is scheduled for Wednesday, Jan 9. * Ahead has nine passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, two at 360 kbps, and one at 240 kbps. Week 3 (Jan 14-20) * Ahead has twelve passes during the week, and overall coverage is nominal. There are nine passes at 720 kbps, two at 360 kbps, and one at 240 kbps. Week 4 (Jan 21-27) * The Martin Luther King federal holiday occurs on Monday, Jan 21. This is not a holiday at APL. * Ahead has 11 passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, one at 360 kbps, and two at 240 kbps. Week 5 (Jan 28-Feb 3) * The 116th momentum dump on Ahead is scheduled for Wednesday, Jan 30, with ignition at 21:00 UT. This is the 35th dump without using the gyros. * Ahead has 9 passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, two at 360 kbps, and one at 240 kbps. Week 6 (Feb 4-10) * Ahead has twelve passes during the week, and overall coverage is nominal. There are ten passes at 720 kbps, and two at 360 kbps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Dec 31 (365) New Year's Eve (APL holiday) T Jan 01 (001) New Year's Day W Jan 02 (002) T Jan 03 (003) F Jan 04 (004) S Jan 05 (005) S Jan 06 (006) ------------------------------------------------------------------------------- Scheduled activities for Week 02: M Jan 07 (007) T Jan 08 (008) W Jan 09 (009) T Jan 10 (010) F Jan 11 (011) S Jan 12 (012) S Jan 13 (013) ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 14 (014) T Jan 15 (015) W Jan 16 (016) T Jan 17 (017) F Jan 18 (018) S Jan 19 (019) S Jan 20 (020) ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 21 (021) Martin Luther King day T Jan 22 (022) W Jan 23 (023) T Jan 24 (024) F Jan 25 (025) S Jan 26 (026) S Jan 27 (027) ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 28 (028) T Jan 29 (029) W Jan 30 (030) Ahead: Momentum dump, 21:00 UT T Jan 31 (031) F Feb 01 (032) S Feb 02 (033) S Feb 03 (034) ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 04 (035) T Feb 05 (036) W Feb 06 (037) T Feb 07 (038) F Feb 08 (039) S Feb 09 (040) S Feb 10 (041) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2019: * Mar Ahead: Switch downlink rate to 240 kbps for 34 meter * Mar 31-Apr 10 Parker Solar Probe perihelion pass * Apr Behind: Switch downlink rate to 240 kbps for 34 meter * Aug 28-Sep 7 Parker Solar Probe perihelion pass * Nov 4 Ahead: Close approach of Parker Solar Probe * Dec 26 Parker Solar Probe Venus flyby 2020: * Jan 24-Feb 4 Parker Solar Probe perihelion pass * 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 * Jun 2-13 Parker Solar Probe perihelion pass * Jul 11 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Sep Ahead: Switch downlink rate to 480 kbps for 34 meter * Sep 22-Oct 2 Parker Solar Probe perihelion pass 2021: * Jan 13-23 Parker Solar Probe perihelion pass * Feb 20 Parker Solar Probe Venus flyby * Apr 25-May 4 Parker Solar Probe perihelion pass * Jul Behind: Switch downlink rate to 720 kbps for 34 meter * Aug Ahead: Switch downlink rate to 720 kbps for 34 meter * Aug 5-15 Parker Solar Probe perihelion pass * Oct 16 Parker Solar Probe Venus flyby * Nov 17-26 Parker Solar Probe perihelion pass 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Dec 7-16 Parker Solar Probe perihelion pass 2023: * Mar 13-23 Parker Solar Probe perihelion pass * May 5 Behind: Mercury transit * Jun 17-27 Parker Solar Probe perihelion pass * Jul 17 Behind: Closest approach to Earth * Aug 13 Ahead: Closest approach to Earth * Aug 21 Parker Solar Probe Venus flyby * Sep 23-Oct 3 Parker Solar Probe perihelion pass * Dec 25-Jan 3 Parker Solar Probe perihelion pass 2024: * Mar 26-Apr 4 Parker Solar Probe perihelion pass * Jun 26-Jul 5 Parker Solar Probe perihelion pass * Sep 26-Oct 5 Parker Solar Probe perihelion pass * Nov 6 Parker Solar Probe Venus flyby, in HI2-A field-of-view * Dec 20-29 Parker Solar Probe perihelion pass 2025: * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: 2027: * Feb 1 Behind: Mercury transit 2028: 2029: * Jun 30 Ahead: Mercury transit