STEREO Weekly Meeting Minutes for 2013-01-14 (Week 03) ANNOUNCEMENTS ------------- * The MOC has determined that it will not be necessary to drop the telemetry rate for Behind on the 70 meter stations below 480 kbps. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 02 (Jan 6-12) * On day 006 (Jan 6), during the DSS-25 support for Ahead, turbo decoder lock was lost briefly at 2204z. This anomaly resulted in the loss of four frames of SSR data. * On day 012 (Jan 12), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently beginning at 1932z through 1940z. No telemetry was received from 1940z through 1955z (EOT). The tracking problems were due to the antenna azimuth brakes being set unexpectedly. These anomalies resulted in eight minutes of degraded telemetry (lost 10361 frames of SSR data) and fifteen minutes of complete telemetry outage. See DR #G114552 more information. * Telemetry coverage for Ahead was short 13.6 hours during the week. On day 006 (Jan 6), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0532z for 6.0 hours. SWAVES (Part 13) reached 100% full at 2218z for 1.7 hours. PLASTIC(Part 17) reached 95% full at 0625z for 11.3 hours. PLASTIC(Part 17) reached 95% full at 2317z for 0.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 007 (Jan 7), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 16.5 hours. IMPACT (Part 15) reached 95% full at 0216z for 14.6 hours. PLASTIC(Part 17) remained 95% full at 0000z for 16.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 007 (Jan 7), the 19th HGA calibration for the AHEAD observatory was executed successfully at 1900z. * On day 008 (Jan 8), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 1118z for 12.7 hours. IMPACT (Part 15) reached 95% full at 1119z for 12.7 hours. PLASTIC(Part 17) reached 95% full at 1258z for 11.1 hours. SECCHI (Part 19) reached 100% full at 1511z for 8.8 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 009 (Jan 9), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) remained 100% full at 0000z for 3.9 hours. IMPACT (Part 15) remained 95% full at 0000z for 3.9 hours. PLASTIC(Part 17) remained 95% full at 0000z for 3.9 hours. SECCHI (Part 19) remained 100% full at 0000z for 3.9 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 010 (Jan 10), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0309z for 8.1 hours. IMPACT (Part 15) reached 95% full at 0815z for 3.0 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 012 (Jan 12), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0610z for 9.7 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 006 (Jan 6), during the DSS-45 support for Behind, turbo decoder lock was lost intermittently beginning at 0214z through 0220z due to the spacecraft IMU-B anomaly recovery. This anomaly resulted in the loss of 1207 frames of SSR data. See DR #C109776 more information. * On day 008 (Jan 8), during the DSS-55 support for Behind, turbo decoder lock was lost briefly at 1047z and again at 1124z. This anomaly resulted in the loss of four frames of SSR data. * On day 009 (Jan 9), during the DSS-34 support for Behind, turbo decoder lock was lost briefly at 0853z. This anomaly resulted in the loss of one frame of SSR data. * On day 006 (Jan 6), during the DSS-26 track for Behind, with IMU-A in use, the SECCHI guide telescope was enabled for use, fine pointing was re-established, and the BEHIND observatory was promoted back to Operational Mode at 2118z. Also, the failed IMU-B unit was powered off 2118z. The SECCHI team sent real-time commands to re-open the COR telescope covers at 2332z (COR2) and 007-0030z (COR1). * On day 007 (Jan 7), during the DSS-14 track for Behind, to conserve the remaining IMU-A lifetime on the BEHIND observatory, a modified Reduced Gyro Operation macro release was loaded to C&DH RAM. The IMU-A unit was powered off at 2240z to place BEHIND in a similar G&C configuration that the AHEAD observatory is using currently. * On day 008 (Jan 8), the 19th HGA calibration for the BEHIND observatory was cancelled due to the IMU anomaly recovery. * On day 011, the SSR science partitions on Behind filled as follows: SWAVES (Part 13) reached 100% full at 0819z for 6.3 hours. The primary cause was the accumulated shortage of track time throughout the week. * The average daily SSR playback volume during the week was 2.5 gigabits for Ahead, and 3.0 gigabits for Behind. Week 03 (Jan 13-19) * The 64th momentum dump on Ahead is scheduled for Thursday, Jan 16 with ignition at 13:30 UT * Ahead has 7 passes during the week. Overall coverage is short 12.2 hours, mainly Monday-Thursday, Jan 13-16. There are two 70 meter supports scheduled, on Friday, Jan 17 (D43), and Saturday, Jan 18 (D63). * Behind has 10 passes during the week. Overall coverage is short 15.2 hours, with the shortfalls occurring Monday-Friday. No 70 meter supports are scheduled. The following passes will be carried out at 160 kbps: Monday, Jan 13 (D26), Tuesday, Jan 14 (D25), and Wednesday, Jan 15 (D55). Week 4 (Jan 20-26) * The 59th momentum dump on Behind is scheduled for Monday, Jan 20, with ignition at 23:00 UT. * The station 54 pass on Monday for Ahead has been cancelled for corrective maintenance. * Ahead has 9 passes during the week, and overall coverage is short 20 hours, spread throughout the week. No 70 meter supports are scheduled. Two passes will be carried out at 160 kbps, both on Saturday, Jan 25 (D16 and D45). * Behind has 10 passes during the week. Overall coverage is short 10.5 hours, with the shortfall Wednesday-Friday. No 70 meter passes are scheduled. The following passes will be carried out at 160 kbps: Thursday, Jan 23 (D26), Friday, Jan 24 (D26), Saturday, Jan 25 (D55), and Sunday, Jan 26 (D26). Week 5 (Jan 27-Feb 2) * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jan 27, Wednesday, Jan 29, Friday, Jan 31, and Saturday, Feb 1, all using station 63. * Behind has 9 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Jan 28, and Wednesday, Jan 29, both using station 63 at 720 kbps. The following passes will be carried out at 160 kbsp, both using station 26: Thursday, Jan 30, and Saturday, Feb 1. Week 6 (Feb 3-9) * Ahead has 8 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Feb 5 (D43), Friday, Feb 7 (D63), and Sunday, Feb 9 (D63). The following passes will be carried out at 160 kbps: Monday, Feb 3 (D34), and Tuesday, Feb 4 (D26). * Behind has 11 passes during the week, and overall coverage is short 8 hours, mainly between Monday-Thursday. 70 meter passes are scheduled for Wednesday, Feb 5 (D63, D14), Thursday, Feb 6 (D63), and Saturday, Feb 8 (D63). The station 26 pass on Friday, Feb 7, will be carried out at 160 kbps. Week 7 (Feb 10-16) * 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 8 (Feb 17-23) * 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), Friday, Feb 21 (D63), and Sunday, Feb 23 (D63). * 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). Other * A question was raised about ESA support. Any possible agreements with ESA are currently on hold. One possibility which is being discussed to have ESA support STEREO on their priority zero schedule, in which passes can be bumped without prior notification. It's expected that this would be rare. * The LADEE mission may be extended. If it is, it may impact the DSN schedules for STEREO which have already been negotiated. * There was some discussion about possible strategies to improve the continuity of the in situ data. PLASTIC expressed the opinion that it would be better to have a number of small gaps in coverage than large multi-hour gaps. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 13 (013) T Jan 14 (014) W Jan 15 (015) T Jan 16 (016) Ahead: Momentum dump, 13:30 UT F Jan 17 (017) S Jan 18 (018) S Jan 19 (019) Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 20 (020) Behind: Momentum dump, 23:00 UT T Jan 21 (021) W Jan 22 (022) T Jan 23 (023) F Jan 24 (024) S Jan 25 (025) S Jan 26 (026) Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 27 (027) T Jan 28 (028) W Jan 29 (029) T Jan 30 (030) F Jan 31 (031) S Feb 01 (032) S Feb 02 (033) ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 03 (034) T Feb 04 (035) W Feb 05 (036) T Feb 06 (037) F Feb 07 (038) S Feb 08 (039) S Feb 09 (040) Notes: * Significant telemetry shortages for the Behind spacecraft are expected during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 10 (041) T Feb 11 (042) 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) T Feb 20 (051) F Feb 21 (052) S Feb 22 (053) S Feb 23 (054) ------------------------------------------------------------------------------- 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 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * Mar 17 - Jul 14 (TBC) Ahead: Spacecraft behind Sun * Aug 25 - Oct 19 (TBC) Behind: Spacecraft behind 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