STEREO Weekly Meeting Minutes for 2010-12-28 (Week 52) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 51 * On day 355 (Dec 21), during the DSS 25 support for Ahead, transmitter tripped off-line at 1448z. This resulted in the loss of several minutes of instrument SSR data. See DR# G110886 for more information. * On day 355 (Dec 21), during the DSS63 support, the command bind for Behind aborted due to a procedural error during scheduled maintenance at the Madrid complex at 1508z. The MOC rebound to the station at 1531z. All instruments SSR data was recovered. See DR# M106093 for more information. * On day 356 (Dec 22), during the DSS65 support, telemetry lock for Behind was intermittent beginning at 1827z and again at 1850z due to heavy rain at Madrid. This resulted in the loss of an hour of instrument SSR data. See DR# M106100 for more information. * On day 357 (Dec 23), during the DSS65 support, turbo decoder lock for Behind was lost intermittently at 1654z through 1706z and again at 1758z. This resulted in the loss of several minutes of instrument SSR data. See DR# N106955 for more information. * On day 357 (Dec 23), during the DSS14 support, turbo decoder lock for Behind was lost intermittently at 358-0042z through. This resulted in the loss of several minutes of instrument SSR data. A DR has been requested. * Friday, Dec 24 was a holiday at APL. * On day 358 (Dec 24), during the DSS25 support, the command bind for Behind aborted at 2125z. Later, the transmitter tripped off-line at 0147z. The uplink was re-established at 0149z. This resulted in the loss of several minutes of instrument SSR data. See DR# G110897 for more information. * Christmas was on Saturday, Dec 25. * The average daily SSR downlink was 5.3 gigabits for Ahead, and 6.0 gigabits for Behind. Week 52 * New Year's Day is on Saturday, Jan 1. Friday, Dec 31 is a holiday at APL. * Ahead has a 720 kbps pass on Wednesday, Dec 29 using station 43. There are 14 passes during the week, and overall coverage is nominal. * Behind has a 720 kbps pass on Friday, Dec 31, using station 43. There are 12 passes during the week, and overall coverage is 1.75 hours above nominal. Week 1 * Ahead has two 720 kbps passes on Wednesday, Jan 5 using stations 14 and 43. There are 14 passes during the week, and overall coverage is nominal * Behind has 720 kbps passes on Monday, Jan 3 (D63), Tuesday, Jan 4 (D43), Wednesday, Jan 5 (D63), Thursday, Jan 6 (D63), and Friday, Jan 7 (D63). There are 15 passes during the week, and overall coverage is 2 hours over nominal. * There is ongoing discussion about an upcoming power upgrade at Goldstone which may affect the schedule during the week. The MOC needs to know soon about any changes, due to the upcoming holidays. Week 2 * The 13th HGA calibrations are scheduled for Behind on Wednesday, Jan 12, and for Ahead on Thursday, Jan 13, starting at 16:00 UT each day. These activities will last about two hours, and will involve rolls of 0.5 degrees. The track times have been extended to 7 hours, and SSR downlink will be stopped during the calibration. * Ahead has a 720 kbps pass on Monday, Jan 10, using station 43. There are 13 tracks during the week, and overall coverage is nominal. * Behind has a 720 kbps pass on Friday, Jan 14, using station 14. There are 14 tracks during the week, and overall coverage is 4.6 hours over nominal. Week 3 * The 16th SECCHI stepped calibration is scheduled for Tuesday, Jan 18, starting at 09:20 UT. This is the midpoint roll. * The 19th momentum dump will be carried out on Ahead on Wednesday, Jan 19, with ignition at 20:00 UT. * Ahead has 720 kbps passes on Tuesday, Jan 18, and on Wednesday, Jan 19, both using station 43. There are 14 passes during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Monday, Jan 17, using station 63, and on Friday, Jan 21, using station 43. There are 12 passes during the week, and overall coverage is 3.3 hours below nominal. Almost all of the shortfall occurs on Thursday, Jan 20; however, this will be followed by a 70 meter pass. Other * SECCHI requests that extra calibration rolls be scheduled for both spacecraft within a week of when the two spacecraft are 180 degrees apart, which occurs on Feb 6. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 52: M Dec 27 (361) T Dec 28 (362) W Dec 29 (363) Ahead: 720 kbps downlink on station 43 T Dec 30 (364) F Dec 31 (365) Behind: 720 kpbs downlink on station 43 S Jan 01 (001) New Years S Jan 02 (002) Notes: * APL will be closed on Dec 31 ------------------------------------------------------------------------------- Scheduled activities for Week 01: M Jan 03 (003) Behind: 720 kpbs downlink on station 63 T Jan 04 (004) Behind: 720 kpbs downlink on station 43 W Jan 05 (005) Ahead: 720 kbps downlink on both stations 14 and 43 Behind: 720 kpbs downlink on station 63 T Jan 06 (006) Behind: 720 kpbs downlink on station 63 F Jan 07 (007) Behind: 720 kpbs downlink on station 63 S Jan 08 (008) S Jan 09 (009) ------------------------------------------------------------------------------- Scheduled activities for Week 02: M Jan 10 (010) Ahead: 720 kbps downlink on station 43 T Jan 11 (011) W Jan 12 (012) Behind: HGA calibration, 16:00 UT T Jan 13 (013) Ahead: HGA calibration, 16:00 UT F Jan 14 (014) Behind: 720 kbps downlink on station 14 S Jan 15 (015) S Jan 16 (016) ------------------------------------------------------------------------------- Scheduled activities for Week 03: M Jan 17 (017) T Jan 18 (018) Behind: SECCHI stepped calibration roll, 09:20 W Jan 19 (019) Ahead: Momentum dump, 20:00 UT 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) ------------------------------------------------------------------------------- Upcoming events: 2011: * Feb 6 STEREO spacecraft at 180 degree separation SECCHI requests calibration rolls on both spacecraft * Jun 27 Ahead: Switch downlink rate to 160 kbps * Jun 27 Ahead: End use of 720 kbps on 70 m DSN subnet * Jul 15 Behind: Switch downlink rate to 160 kbps * Jul 15 Behind: End use of 720 kbps on 70 m DSN subnet * Mar 18 Messenger - Mercury orbital insertion * Jul DAWN - Vesta arrival * Jul 13 Both: HGA calibration 2012: * Jan 11 Both: HGA calibration * 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