STEREO Weekly Meeting Minutes for 2022-01-11 (Week 02) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * Ahead is operating nominally. PLASTIC is in operational mode, but with a high background rate. * 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 01 (Jan 3-9) * On day 004 (Jan 04), the 143rd momentum dump was executed successfully on Ahead at 1945z, which imparted an estimated delta V of 0.063 m/sec. This was the 62nd momentum dump conducted without gyro use. After thruster operations completed, there was a 0.96 degree of roll angle error. Fine pointing stabilized 2.7 minutes after completion of the momentum dump. * On day 009 (Jan 09), the star tracker on Ahead reset at 22:01:00z. Fault protection immediately promoted the star tracker back to AAD mode at 22:01:23z. The diagnostic data indicated that the reset cause was due to a CPU Error, same as previous resets. The anomaly resulted in a momentary loss of fine pointing with a 0.17 degree of roll angle error. This was the ninth star tracker reset on the Ahead observatory. * A comment was made that there were a number of single bit errors in the G&C system on the same day as the star tracker reset, about 1.5 hours before the reset, and asked whether there were any similar problems on other systems. The SSC reported that the IMPACT data showed no evidence of a particle storm at the time. * As of day 009 (Jan 9), all PLASTIC systems on Ahead are behaving well, except there is a high background count rate, which the team is continuing to monitor. * The average daily science data return for Ahead was 6.4 Gbits during this week. Week 02 (Jan 10-16) * Ahead has ten passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, and four at 480 kbps. An ESA New Norcia pass is scheduled for Friday, Jan 14. The schedule for the week was adjusted to take the needs of the JWST mission into account. Week 03 (Jan 17-23) * Ahead has twelve passes during the week, and overall coverage is nominal. There are nine passes at 720 kbps, two at 480 kbps, and one at 360 kbsp. The schedule for the week was adjusted to take the needs of the JWST mission into account. ESA station passes are scheduled for Monday, Jan 17 (Cebreros), Wednesday, Jan 19 (Malargue), and Friday, Jan 21 (New Norcia). * APL will be closed on Monday, Jan 17, for the Martin Luther King Day holiday. Week 04 (Jan 24-30) * Ahead has thirteen passes during the week, and overall coverage is nominal. There are eight passes at 720 kbps, and five at 480 kbps. * Maintenance will be performed on the APL DMZ to upgrade switches on Friday, Jan 18, between 21:00 UT to 05:00 UT the next day (4-11 PM EST). The pass occurs during the last hour of a 63 pass, so external connection to the realtime telemetry may be interrupted. The MOC will be staffed to monitor the pass, and missing data will be pulled from the DSN after the pass is over. Week 05 (Jan 31-Feb 6) * Ahead has twelve passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, and six at 480 kbps. Week 06 (Feb 7-13) * Ahead has eleven tracks during the week, and overall coverage is nominal. There are nine tracks at 720 kbps, and two at 480 kbps. * The 144th momentum dump is scheduled for Thursday, Feb 10, with ignition at 20:30 UT. Week 07 (Feb 14-20) * Ahead has twelve passes during the week, and overall coverage is nominal. There are six passes at 720 kbps, and six at 480 kbps. * The annual spacecraft assessment review is scheduled for Thursday, Feb 18, between 8:30-12:00 EST. This will be a virtual meeting. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 02: M Jan 10 (010) T Jan 11 (011) W Jan 12 (012) T Jan 13 (013) F Jan 14 (014) S Jan 15 (015) S Jan 16 (016) ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 17 (017) Martin Luther King Day T Jan 18 (018) W Jan 19 (019) T Jan 20 (020) F Jan 21 (021) S Jan 22 (022) S Jan 23 (023) ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 24 (024) T Jan 25 (025) W Jan 26 (026) T Jan 27 (027) F Jan 28 (028) S Jan 29 (029) S Jan 30 (030) ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 31 (031) T Feb 01 (032) W Feb 02 (033) T Feb 03 (034) F Feb 04 (035) S Feb 05 (036) S Feb 06 (037) ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 07 (038) T Feb 08 (039) W Feb 09 (040) T Feb 10 (041) Ahead: Momentum dump, 20:30 UT F Feb 11 (042) S Feb 12 (043) S Feb 13 (044) ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 14 (045) T Feb 15 (046) W Feb 16 (047) T Feb 17 (048) F Feb 18 (049) S Feb 19 (050) S Feb 20 (051) ------------------------------------------------------------------------------- Upcoming events: Behind events are contingent on recovering the spacecraft. 2022: * Feb 21-Mar 2 Parker Solar Probe perihelion pass * Feb 22, 26 PSP/Solar Orbiter quadrature observations * Apr 27-30 Comet PANSTARRS in COR2-A field-of-view * May 28-Jun 7 Parker Solar Probe perihelion pass * Sep 2-11 Parker Solar Probe perihelion pass * Sep 4 Solar Orbiter Venus flyby * 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: * Feb 18 Solar Orbiter Venus flyby * Mar 19-27 Parker Solar Probe perihelion pass * Apr 7 Ahead: Mercury transit * Jun 15-24 Parker Solar Probe perihelion pass 2026: * Dec 24 Solar Orbiter Venus flyby 2027: * Feb 1 Behind: Mercury transit 2028: * Mar 18 Solar Orbiter Venus flyby 2029: * Jun 10 Solar Orbiter Venus flyby * Jun 30 Ahead: Mercury transit 2030: * Sep 3 Solar Orbiter Venus flyby