STEREO Weekly Meeting Minutes for 2012-01-03 (Week 01) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 51 (Dec 19-25) (discussed during previous week's telecon) * On day 354 (Dec 20), during the DSS-14 support for Ahead, turbo decoder lock was lost at 1341z. This anomaly resulted in the loss of 268 frames of SSR data. See DR# N107829 for more information. * On day 354 (Dec 20), a test track was conducted with the ESA 35 meter New Norcia station (DSS-32), via the DSN, to the STEREO MOC using the Ahead observatory. The station locked to the 160 kbps downlink telemetry with a good received power level for the duration of the support. A test command was sent successfully. The MOC received the SSR playback data over the RIONet and processed it successfully. As it was a test track, SSR pointers were repositioned to ensure no science data loss. Two minor issues occurred: telemetry was received 35 minutes late in the MOC due to a DSN/ESA configuration issue, and the station could not maintain ranging lock. * On day 355 (Dec 21), a test track was conducted with the ESA 35 meter Cebreros station (DSS-62), via the DSN, to the STEREO MOC using the Ahead observatory. The station locked to the 160 kbps downlink telemetry with a good received power level for the duration of the support. The MOC received the SSR playback data over the RIONet and processed it successfully. As it was a test track, SSR pointers were repositioned to ensure no science data loss. The command RF link could not be tested as the STEREO project has not received frequency authorization from Spain yet; however, the MOC successfully tested the command bind from all three command workstations. * On day 359 (Dec 25), for the DSS-14 support for Ahead, telemetry lock was lost beginning at 1746z due to the antenna brakes being set. Due to a hydraulic leak the antenna was declared red and the remaining 3.4 hours of the track was lost. SSR pointers were reset to minimize science data loss. This anomaly resulted in the loss of an hour of SSR data for each instrument. See DR# G112208 for more information. * On day 354 (Dec 20), the 43rd momentum dump was successfully executed on Ahead at 1700Z, which imparted a delta V of 0.0726 m/sec. * On day 354 (Dec 20), MOps permanent macro release 1.1.14 was loaded to C&DH EEPROM on both spacecraft. This release modified a star tracker contingency macro to collect more diagnostic data during a star tracker reset. * On day 353 (Dec 19), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1543z. This anomaly resulted in the loss of one frame of SSR data. See DR# N107824 for more information. * On day 354 (Dec 20), a test track was conducted with the ESA 35 meter Cebreros station (DSS-62), via the DSN, to the STEREO MOC using the Behind observatory. This test track was shadowing an operational track with DSS-15. The station locked to the 160 kbps downlink telemetry with a good received power level for the duration of the support; however, telemetry was never received in the MOC due to a DSN/ESA configuration issue. After the support, the DSN corrected the configuration problem and a successful telemetry bind to DSS-62 was established. The command RF link could not be tested as the STEREO project has not received frequency authorization from Spain yet; however, the MOC successfully tested the command bind from all three command workstations. * On day 355 (Dec 21), a test track was conducted with the ESA 35 meter New Norcia station (DSS-32), via the DSN, to the STEREO MOC using the Behind observatory. The station locked to the 160 kbps downlink telemetry with a good received power level for the duration of the support. Test commands were sent successfully from all three command workstations. The MOC received the SSR playback data over the RIONet and processed it successfully. As it was a test track, SSR pointers were repositioned to ensure no science data loss. Two minor issues occurred: telemetry was received 35 minutes late in the MOC due to a DSN/ESA configuration issue, and the station could not maintain ranging lock. * On day 355 (Dec 21), during the DSS-63 support for Behind, turbo decoder lock was lost briefly at 1759z. This anomaly resulted in the loss of one frame of SSR data. See DR# N107828 for more information. * On day 353 (Dec 19), the 37th momentum dump was successfully executed on Behind at 1600Z, which imparted a delta V of 0.06 m/sec. * The average daily SSR playback volume was 5.4 gigabits for Ahead, and 5.4 gigabits for Behind. Week 52 (Dec 26 - Jan 1) * On day 360 (Dec 26), during the DSS-25 support for Ahead, turbo decoder lock was lost briefly at 1836z. This anomaly resulted in the loss of one frame of SSR data. See DR# N107831 for more information. * On day 361 (Dec 27), during the DSS-55 support for Ahead, turbo decoder lock was lost briefly at 0831z and again at 0854z. This anomaly resulted in the loss of two frames of SSR data. See DR# N107832 for more information. * On day 362 (Dec 28), the SECCHI SSR1 science partition on Ahead reached 100% full due to the DSS-14 antenna red anomaly on day 359. Specifically, SECCHI stopped recording data for 7.25 hours beginning at 362-2348z. See DR# G112208 for more information. The SECCHI team asked if they would normally have received a notice if it hadn't been for the holidays. The MOC responded that normally the teams would have been notified by email. * On day 363 (Dec 29), during the DSS-54 support for Ahead, turbo decoder lock was lost briefly at 0704z. This anomaly resulted in the loss of seven frames of SSR data. See DR# N107838 for more information. * On day 365 (Dec 31), during the DSS-25 support for Behind, turbo decoder lock was lost briefly at 1931z. This anomaly resulted in the loss of one frame of SSR data. A DR will be requested. * On day 001 (Jan 1), during the DSS-15 support for Behind, the Station encountered continuous DCD failovers causing the loss of all DCC data. This anomaly resulted in the lost last 28 minutes of SSR data from 0202-0230z the next day (Jan 2). See DR# G112227 for more information. These data are unrecoverable. * The average daily SSR playback volume was 4.6 gigabits for Ahead, and 4.5 gigabits for Behind. Week 1 (Jan 2-8) * The SECCHI instrument on Ahead had a watchdog reset yesterday (Jan 2) at 22:45 UT, and was commanded back into operational mode today. * Tracks using the ESA New Norcia station are scheduled for Jan 5 on Ahead, and Jan 8 on Behind. These will appear on the schedule as station 32, and are the first operational ESA tracks for STEREO. * Ahead has 70 meter passes on Monday, Jan 2, and Saturday, Jan 7, both using station 14. There are 14 passes during the week, and overall coverage is nominal. The station 26 pass on Thursday, Jan 5, and the station 45 pass on Sunday, Jan 8, will be carried out at 240 kbps. * Behind has a 70 meter pass on Saturday, Jan 7, using station 43 at 720 kbps. There are 12 passes during the week, and overall coverage is nominal. The station 15 pass on Wednesday will be carried out at 240 kbps. Week 2 (Jan 9-15) * The 20th SECCHI stepped calibration roll for Ahead is scheduled for Tuesday, Jan 10, starting at 02:40 UT. This will be the midpoint roll. System momentum is expected to be around 1 N-m-s. * HGA calibration rolls are scheduled on Behind on Tuesday, Jan 10, starting at 16:00 UT, and on Ahead on Thursday, Jan 12, starting at 19:00 UT. Each spacecraft will be rotated by +/- 1/2 degree, and the maneuver will last about one hour. * A 2 hour pass for Behind is scheduled on the ESA New Norcia D32 station on Saturday, Jan 14, starting at 03:20 UT. * Ahead has a 70 meter pass on Thursday, Jan 12, using station 43. There are 11 passes during the week, and overall coverage is nominal. The station 34 pass on Saturday, Jan 14, will be carried out at 240 kbps. * Behind has 13 passes during the week, and overall coverage is nominal. There are no 70 meter or high elevation passes during the week. Week 3 (Jan 16-22) * A 2.25 hour pass for Behind is scheduled on the ESA New Norcia D32 station on Thursday, Jan 19, starting at 06:30 UT. * Ahead has 70 meter passes on Monday, Jan 16 (D63), Tuesday, Jan 17 (D43), Thursday, Jan 19 (D14, D43 at 720 kbps), and Saturday, Jan 21 (D43 twice, first at 720 kbps). There are 10 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Jan 16, Tuesday, Jan 17, Thursday, Jan 19, Saturday, Jan 21, and Sunday, Jan 22, all using station 63. There are 15 passes during the week, and overall coverage is nominal. The station 34 pass on Monday will be carried out at 240 kbps. Week 4 (Jan 23-29) * Ahead has 70 meter passes on Wednesday, Jan 25 (D43), Friday, Jan 27 (D14), Saturday, Jan 28 (D63), and Sunday, Jan 29 (D63). There are 13 passes during the week, and overall coverage is nominal. A 6.1 hour pass is scheduled using the ESA New Norcia station D32 late Monday. * Behind has 70 meter passes on Tuesday, Jan 24 (D63), Thursday, Jan 26 (D14 at 720 kbps), and Saturday, Jan 28 (D43 at 720 kbps, D63). There are 11 passes during the week, and overall coverage is nominal. The station 15 pass on Saturday, Jan 28, will be carried out at 240 kbps. A 4.75 hour pass is scheduled using the ESA New Norcia station D32 on Thursday. Other * A question was asked about momentum dumps. Dumps were performed just before Christmas. The next dumps should occur sometime in late January or early February. * Some software problems in the SSC during the New Year's weekend interfered with some of the processing of the SECCHI beacon images. These gaps will persist until the full-resolution data are available from NRL. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Jan 02 (002) Ahead: 70 meter downlink on station 14 T Jan 03 (003) W Jan 04 (004) T Jan 05 (005) F Jan 06 (006) S Jan 07 (007) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 43 S Jan 08 (008) ------------------------------------------------------------------------------- Scheduled activities for Week 02: M Jan 09 (009) T Jan 10 (010) Ahead: SECCHI stepped calibration roll, 02:40 UT Behind: HGA calibration, 16:00 W Jan 11 (011) T Jan 12 (012) Ahead: HGA calibration, 19:00 Ahead: 70 meter downlink on station 43 F Jan 13 (013) S Jan 14 (014) S Jan 15 (015) ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 16 (016) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 63 T Jan 17 (017) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on station 63 W Jan 18 (018) T Jan 19 (019) Ahead: 70 meter downlink on stations 14 and 43 Behind: 70 meter downlink on station 63 F Jan 20 (020) S Jan 21 (021) Ahead: 70 meter downlink on station 43 (twice) Behind: 70 meter downlink on station 63 S Jan 22 (022) Behind: 70 meter downlink on station 63 ------------------------------------------------------------------------------- Scheduled activities for Week 04: M Jan 23 (023) T Jan 24 (024) Behind: 70 meter downlink on station 63 W Jan 25 (025) Ahead: 70 meter downlink on station 43 T Jan 26 (026) Behind: 70 meter downlink on station 14 F Jan 27 (027) Ahead: 70 meter downlink on station 14 S Jan 28 (028) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on stations 43 and 63 S Jan 29 (029) Ahead: 70 meter downlink on station 63 ------------------------------------------------------------------------------- Upcoming events: 2012: * Jul DAWN - Vesta departure * Jul 11 Both: HGA calibration * Nov 4 Behind: Switch downlink rate to 120 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * May 3 Ahead: Switch downlink rate to 120 kbps * Dec 12 Ahead: Mercury transit 2014: * Jan 20 Behind: End use of 480 kbps on 70 m DSN subnet * Apr 21 Behind: Resume use of 480 kbps on 70 m DSN subnet * Apr 29 Behind: Mercury transit * Oct 15 Behind: End use of 480 kbps on 70 m DSN subnet 2015: * Feb DAWN - Ceres arrival * Jan 20 - Mar 28 (TBC) Behind: Spacecraft behind Sun * Mar 17 - Jul 14 (TBC) Ahead: Spacecraft behind Sun * Jul 2 Behind: Resume use of 480 kbps on 70 m DSN subnet * Aug 25 - Oct 19 (TBC) Behind: Spacecraft behind Sun * Sep 25 Behind: End use of 480 kbps on 70 m DSN subnet * Jul DAWN - End of nominal mission 2016: * Apr 3 Behind: Resume use of 480 kbps on 70 m DSN subnet 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