STEREO Weekly Meeting Minutes for 2014-02-04 (Week 06) ANNOUNCEMENTS ------------- * APL has scheduled a brief connectivity outage on Thursday, Feb. 6, for IT maintenance. It will start at 02:30 UT (9:30 EST) and last about 15 min. Anyone outside connecting in will need to reconnect. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 5 (Jan 27-Feb 2) * On day 028 (Jan 28), during the DSS-25 track for Ahead, a project interface test was conducted to test DTT software version 11.3 (downlink tracking and telemetry upgrades). All test objectives were completed successfully. * On day 030 (Jan 30), the processing and delivery of the daily MOC data products for both spacecraft, including the Level Zero telemetry files, was delayed by approximately 19 hours due to the scheduled MOC data system security upgrade (Likewise deployment). A disk drive containing the 2014 data failed to mount properly. This disk drive was placed on-line and the day 030 data products were reprocessed. * On day 030 (Jan 30), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 2237z for 1.1 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 031 (Jan 31), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0000z for 8.6 hours. The primary cause was the accumulated shortage of track time throughout the week. * On day 032 (Feb 1), the SSR science partitions on Ahead filled as follows: SWAVES (Part 13) reached 100% full at 0328z for 5.1 hours. The primary cause was the accumulated shortage of track time throughout the week. * The filling of the SWAVES partition on days 30-32 was unexpected. * On day 027 (Jan 27), during the DSS-34 track for Behind, two IDR files were not transmitted due to scheduled DCD catalogue maintenance (0545z through 0615z). These files were recovered on day 031 and have since been re-processed. * On day 028 (Jan 28), during the DSS-63 support for Behind, turbo decoder lock was lost intermittently between 1502z and 1553z. This anomaly resulted in the loss of 350 frames of SSR data. See DR# N109365 for more information. * On day 032 (Feb 1), during the DSS-55 support for Behind, turbo decoder lock was lost briefly at 0917z. This anomaly resulted in the loss of 327 frames of SSR data. See DR# M107726 for more information. * The full Reduced Gyro Operations (RGO) fault protection capability for the Behind observatory has been developed and is being built. Testing of the fault protection rules and load scripts will begin shortly thereafter. This will replace the temporary version that is currently on the BEHIND observatory by providing fault protection robustness, similar in concept to what is being used on the AHEAD observatory, with an enhancement to reduce the likelihood of unintended autonomous momentum dump firings. RGO extends the life of the remaining IMU by keeping it off most of the time and turning it on only when high rate data is required, such as the periodic momentum dumps, instrument roll calibrations, and spacecraft safety. The enhancement regarding unintended firings will also be deployed on Ahead. * The average daily SSR playback volume during the week was 3.1 gigabits on Ahead, and 3.2 gigabits on Behind. Week 6 (Feb 3-9) * APL has scheduled a brief connectivity outage on Thursday, Feb. 6, for IT maintenance. It will start at 02:30 UT (9:30 EST) and last about 15 min. Anyone outside connecting in will need to reconnect. * 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 12 passes during the week, and overall coverage is nominal. 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. There will be an ESA support on Monday, Feb 3 from the station in Malargüe. Week 7 (Feb 10-16) * The 29th SECCHI step calibration on Ahead will occur on Tuesday Feb. 11 at 06:25 UT. This is the perihelion calibration, although the actual perihelion will occur Feb 24. The step call is being done early because of system momentum considerations. System momentum will be 5 N-m-s. * 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) * The 65th momentum dump on Ahead is scheduled for Wednesday, Feb 19, with ignition at 18:30 UT. * 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). The station 26 pass on Saturday, Feb 22, will be carried out at 160 kbps. * 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). Week 9 (Feb 24-Mar 2) * Perihelion for Ahead occurs on Monday, Feb 24. * The 60th momentum dump for Behind is scheduled for Thursday, Feb 27, with ignition at 00:30 UT. The time of the momentum dump was changed due to the DSN schedule. * Ahead has 11 tracks during the week, and overall coverage is nominal. There are 70 meter passes on Monday, Feb 24 (D43 at 720 kbps), Wednesday, Feb 26 (D14 at 720 kbps), and Friday, Feb 28 (D14). The D26 pass on Tuesday, Feb 25, is at 160 kbps, and on Sunday, Mar 2, is at 240 kbps. * Behind has 13 tracks during the week, and overall coverage is nominal. There are 70 meter tracks on D43 on Monday Feb 24 and Sunday Mar 2. The Mar 2 track is at 720 kbps. The following passes, all on D26, will be carried out at 160 kbps: Monday, Feb 24, Wednesday Feb. 26, and Sunday Mar 2. There will be two ESA passes on Malargüe, on Wednesday, Feb. 26 and Thursday Feb. 27, each 4 hours long. Week 10 (Mar 3-9) * Daylight saving time in the U.S. begins Mar 9. * Ahead has 11 passes during the week, and overall coverage is short 14 hours, mainly between Tuesday-Thursday, Mar 4-6. 70 meter tracks are scheduled for Monday, Mar 3 (D14), and Thursday, Mar 6 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Mar 3 (D55), Saturday, Mar 8 (D34, D55, D26), and Sunday, Mar 9 (D45). * Behind has 12 passes during the week, and overall coverage is short 9.9 hours, mainly between Tuesday-Friday, Mar 4-7. There are no 70 meter passes during the week. Passes will be conducted at 160 kbps on the following dates: Monday, Mar 3 (two), Tuesday, Mar 4 (two), Thursday, Mar 6, Friday, Mar 7, and Saturday, Mar 8. Week 11 (Mar 10-16) * Ahead has 10 passes during the week, and overall coverage is short 14.4 hours, mainly between Monday-Friday, Mar 10-14. A 70 meter pass is scheduled for Tuesday, Mar 11 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Mar 10 (D34), Friday, Mar 14 (D24), and Sunday, Mar 16 (D45). * Behind has 14 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Mar 12, and Friday, Mar 14 (D43 at 720 kbps). The following passes will be carried out at 160 kbps, all using station 26: Monday, Mar 10, Friday, Mar 14, and Sunday, Mar 16. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- 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) Ahead: SECCHI stepped calibration roll, 06:25 UT 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) Ahead: Momentum dump, 18:30 UT T Feb 20 (051) F Feb 21 (052) S Feb 22 (053) S Feb 23 (054) ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 24 (055) Ahead: Perihelion T Feb 25 (056) W Feb 26 (057) T Feb 27 (058) Behind: Momentum dump, 00:30 UT F Feb 28 (059) S Mar 01 (060) S Mar 02 (061) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 03 (062) T Mar 04 (063) W Mar 05 (064) T Mar 06 (065) F Mar 07 (066) S Mar 08 (067) S Mar 09 (068) Daylight saving time starts ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 10 (069) T Mar 11 (070) W Mar 12 (071) T Mar 13 (072) F Mar 14 (073) S Mar 15 (074) S Mar 16 (075) ------------------------------------------------------------------------------- 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