STEREO Weekly Meeting Minutes for 2012-02-21 (Week 08) ANNOUNCEMENTS ------------- * None INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 7 (Feb 13-19) * On day 044 (Feb 13), during the DSS-26 support of Ahead, turbo decoder lock was lost briefly beginning at 20:00 UT. This anomaly resulted in the loss of six frames of SSR data. See DR# N107948 for more information. * On day 045 (Feb 14), the 20th SECCHI stepped calibration of Behind, for the midpoint in the orbit, was executed successfully. * On day 047 (Feb 16), during the DSS-55 support of Ahead, no real-time telemetry was received on the primary command workstation in the MOC due to a known SLE telemetry bind anomaly. The backup command workstation received real-time data satisfactory. All SSR data were received. * On day 047 (Feb 16), during the DSS-45 support of Behind, turbo decoder lock was lost briefly beginning at 09:08 UT. This anomaly resulted in the loss of one frame of SSR data. See DR# N107949 for more information. * On day 048 (Feb 17), during the DSS-14 support of Ahead, the pre-pass ranging calibration failed. The ranging transmitter server at the antenna was reset and a post pass ranging calibration was conducted. All SSR data were received. See DR# G112374 for more information. * On day 050 (Feb 19), for the DSS 32 support of Behind, no real-time telemetry was received in the MOC at BOT due to a DSN to ESA telemetry bind anomaly. The DSN successfully connected to ESA SLE telemetry server 4 at 01:48 UT and after restarting the command workstation stream, the MOC received real-time telemetry at 03:38 UT. SSR pointers were repositioned and all SSR data were recovered. This anomaly resulted in the loss of 128 minutes of real-time telemetry data and commanding. All SSR data were received. * The average daily SSR playback volume during the week was 4.9 gigabits for Ahead, and 5.3 gigabits for Behind. Week 8 (Feb 20-26) * Ahead has 70 meter passes on Monday, Feb 20 (D14), Tuesday, Feb 21 (D14, D43 at 720 kbps), Thursday, Feb 23 (D14), Saturday, Feb 25 (D14), and Sunday, Feb 26 (D14, D43 at 720 kbps). There are 9 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Tuesday, Feb 21 (D14 at 720 kbps), Wednesday, Feb 22 (D43), Thursday, Feb 23 (D43), and Friday, Feb 24 (D14 at 720 kbps). There are 8 passes during the week, and overall coverage is nominal. A pass is scheduled with the ESA New Norcia station on Friday, Feb 24. Week 9 (Feb 27-Mar 4) * Ahead has 70 meter passes on Tuesday, Feb 28 (D14), Friday, Mar 2 (D43), and Saturday, Mar 3 (D43 at 720 kbps). There are 11 passes during the week, and overall coverage is nominal. The station 26 pass on Friday, Mar 2, will be carried out at 240 kbps. * Behind has 70 meter passes on Monday Feb 27 (D14) Tuesday, Feb 28 (D43 at 720 kbps), and Thursday, Mar 1 (D14 at 720 kbps). There are 12 passes during the week, and overall coverage is nominal. The station 45 pass on Friday, Mar 2, will be carried out at 240 kbps. Passes are scheduled with the ESA New Norcia station on Monday, Feb 27, and Sunday, Mar 4. Week 10 (Mar 5-11) * The 45th momentum dump is scheduled for Ahead on Monday, day 65 (Mar 5), starting at 18:00 UT. * The 39th momentum dump is scheduled for Behind on Thursday, day 68 (Mar 8), starting at 16:00 UT. * A PIT test is scheduled on Friday, Mar 9, using station 15 with Ahead. There will be no playback during this test, but uplink will be available. * Sunday, Mar 11, marks the start of daylight savings time in the U.S. * Ahead has 70 meter passes on Tuesday, Mar 6 (D14 at 720 kbps), Wednesday, Mar 7 (D14), Friday, Mar 9 (D14 at 720 kbps), Saturday, Mar 10 (D14 at 720 kbps), and Sunday, Mar 11 (D14). There are 14 passes during the week, and overall coverage is nominal. The station 54 pass on Sunday, Mar 11, will be carried out at 240 kbps. Passes are scheduled with the ESA New Norcia station on Monday, Mar 5, and Friday, Mar 9. There is also a pass with ESA Cebreros station on Monday, Mar 5--this is the first operational pass for STEREO with this station. * Behind has 70 meter passes on Friday, Mar 9 (D43 at 720 kbps), and Saturday, Mar 10 (D43). There are 13 passes during the week, and overall coverage is nominal. The station 45 pass on Monday, Mar 5, the station 55 pass on Wednesday, Mar 7, and the station 24 pass on Sunday, Mar 11, will all be carried out at 240 kbps. Passes are scheduled with the ESA New Norcia station on Tuesday, Mar 6, and Thursday, Mar 8. Week 11 (Mar 12-18) * Ahead has 70 meter passes on Monday, Mar 12 (D63), Wednesday, Mar 14 (D63), Saturday, Mar 17 (D63), and Sunday, Mar 18 (D43). There are 10 passes during the week, and overall coverage is nominal. An ESA New Norcia pass is scheduled for Thursday, Mar 15. * Behind has 70 meter passes on Monday, Mar 12 (D43 at 720 kbps), Tuesday, Mar 13 (D63), and Friday, Mar 16 (D63 at 720 kbps). There are 11 passes during the week, and overall coverage is nominal. The station 65 pass on Wednesday, Mar 14, and the station 24 pass on Thursday, Mar 15, will both be carried out at 240 kbps. Week 12 (Mar 19-25) * Ahead has 70 meter passes on Tuesday, Mar 20 (D43 at 720 kbps), Friday, Mar 23 (D43), and Sunday, Mar 25 (D43 at 720 kbps). There are 9 passes during the week, and overall coverage is nominal. * Behind has 70 meter passes on Monday, Mar 19 (D63), Tuesday, Mar 20 (D63), Friday, Mar 23 (D43), Saturday, Mar 24 (D63), and Sunday, Mar 25 (D63). There are 11 passes during the week, and overall coverage is nominal. The station 54 pass on Wednesday, Mar 21, will be carried out at 240 kbps. Week 13 (Mar 26-Apr 1) * Ahead has 70 meter tracks on Friday, Mar 30 (D43) and Sunday, Apr. 1 (D14) There are 12 passes during the week and overall coverage is nominal. * Behind has 70 meter passes on Monday Mar 26 (D43), Saturday Mar 31 (D63 at 720 kbps), and Sunday (D14 at 720 kbps). There are 9 passes during the week. Coverage will be a little short for SECCHI, in situ instruments should be ok. Week 14 (Apr 2-8) * 21st SECCHI stepped cal for Ahead at Perihelion is on Tuesday Apr. 3 at 14:45 UT Momentum: 5 Nm/s * Ahead has 70 meter tracks on Tuesday Apr. 3 (D43), Wednesday Apr. 4 (D43), Friday Apr. 6 (D14), and Sunday Apr. 8 (D63, D14 at 720 kbps). There are 12 tracks total and coverage is nominal. * Behind has 70 meter tracks on Monday Apr. 2 (D63 at 720 kbps) Tuesday Apr. 3 (D14), Thursday Apr. 5 (D63 at 720 kbps) and Friday Apr. 6 at (D63 720 kbps). There are 10 tracks during the week and coverage is nominal. Other * S/WAVES asked for and received confirmation that STEREO has been rolled as quickly as 6 deg/min. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 20 (051) Ahead: 70 meter downlink on station 14 T Feb 21 (052) Ahead: 70 meter downlink on stations 14 and 43 Behind: 70 meter downlink on station 14 W Feb 22 (053) Behind: 70 meter downlink on station 43 T Feb 23 (054) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 43 F Feb 24 (055) Behind: 70 meter downlink on station 14 S Feb 25 (056) Ahead: 70 meter downlink on station 14 S Feb 26 (057) Ahead: 70 meter downlink on stations 14 and 43 ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 27 (058) Behind: 70 meter downlink on stations 14 T Feb 28 (059) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 43 W Feb 29 (060) T Mar 01 (061) Behind: 70 meter downlink on station 14 F Mar 02 (062) Ahead: 70 meter downlink on station 43 S Mar 03 (063) Ahead: 70 meter downlink on station 43 S Mar 04 (064) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 05 (065) Ahead: Momentum dump, 18:00 UT T Mar 06 (066) Ahead: 70 meter downlink on station 14 W Mar 07 (067) Ahead: 70 meter downlink on station 14 T Mar 08 (068) Behind: Momentum dump, 16:00 UT F Mar 09 (069) Ahead: PIT test using station 15 Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 43 S Mar 10 (070) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 43 S Mar 11 (071) Ahead: 70 meter downlink on station 14 Start of daylight savings time in U.S. ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 12 (072) Ahead: 70 meter downlink on station 63 Behind: 70 meter downlink on station 43 T Mar 13 (073) Behind: 70 meter downlink on station 63 W Mar 14 (074) Ahead: 70 meter downlink on station 63 T Mar 15 (075) F Mar 16 (076) Behind: 70 meter downlink on station 63 S Mar 17 (077) Ahead: 70 meter downlink on station 63 S Mar 18 (078) Ahead: 70 meter downlink on station 43 ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 19 (079) Behind: 70 meter downlink on station 63 T Mar 20 (080) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on station 63 W Mar 21 (081) T Mar 22 (082) F Mar 23 (083) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on station 43 S Mar 24 (084) Behind: 70 meter downlink on station 63 S Mar 25 (085) Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on station 63 ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 26 (086) Behind: 70 meter downlink on station 43 T Mar 27 (087) W Mar 28 (088) T Mar 29 (089) F Mar 30 (090) Ahead: 70 meter downlink on station 43 S Mar 31 (091) Behind: 70 meter downlink on station 63 S Apr 01 (092) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Apr 02 (093) Behind: 70 meter downlink on station 63 T Apr 03 (094) Ahead: SECCHI stepped calibration, 14:45 UT Ahead: 70 meter downlink on station 43 Behind: 70 meter downlink on station 14 W Apr 04 (095) Ahead: 70 meter downlink on station 43 T Apr 05 (096) Behind: 70 meter downlink on station 63 F Apr 06 (097) Ahead: 70 meter downlink on station 14 Behind: 70 meter downlink on station 63 S Apr 07 (098) S Apr 08 (099) Ahead: 70 meter downlink on station 14 and 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