STEREO Weekly Meeting Minutes for 2011-02-22 (Week 08) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 7 * On day 047 (Feb 16), during the DSS 65 support for Ahead, intermittent turbo decoder lock from 0928 - 1005z due to rain. This resulted in the loss of ~2 hours SSR data for all instruments. See DR# M106157 for more information. * On day 049 (Feb 18), during the DSS 65 support for Ahead, turbo decoder lock was lost briefly at 0942z. This resulted in the loss of four frames of instrument SSR data. See DR# N107158 for more information. * On day 050 (Feb 19), during the DSS 55 support for Ahead, turbo decoder lock was lost briefly at 0931z. This resulted in the loss of four frames of instrument SSR data. See DR# N107159 for more information. * On day 051 (Feb 20), during the DSS 55 support for Ahead, turbo decoder lock was lost briefly at 0750z. This resulted in the loss of two minutes of SECCHI SSR data. See DR#N107161 for more information. * On day 047 (Feb 16), during the DSS 65 support for Behind, intermittent turbo decoder lock from 1655z throughout the track due to rain. To avoid data loss, MOPS disabled the SSR playback and moved the Read pointers back to the beginning of track position. All weekly commanding activities were moved to tracks on DOY 048 and 049. See DR# M106160 for more information. * On day 049 (Feb 18), during the DSS 14 support for Behind, intermittent turbo decoder lock from 0136z throughout the track due to rain. To minimize data loss, MOPS replayed SSR partitions 15 (IMPACT), 17 (PLASTIC), and 20 (SECCHI/Special Event). This resulted in the loss of ~3 hours SSR data for all instruments. See DR# G111098 for more information. * On day 046 (Feb 15), during the DSS 65 support for Behind, re-enabled playback of the SECCHI Special Event partition #20 at 1833z. The data were not played back during this track due to the SSR partition #20 leading pointer being set as read pointer. * On day 049 (Feb 18), during the DSS 14 support for Behind, changed the SSR partition #20 (SECCHI/Special Event) leading pointer to write pointer and began playback of the SECCHI special event. * The average daily SSR playback volume was 4.3 gigabits for Ahead, and 4.5 gigabits for Behind. Week 8 * Ahead has 720 passes on Monday (Feb 21) and Thursday (Feb 24) on D43. * Station 25 had a pointing problem starting at 13:15, during the Ahead track. Almost the whole track was missed. Pointers will be repositioned during the next track on station 34. Because of the 70 meter track on Thursday, no data are expected to be lost. * Behind has 720 passes on Friday (Feb 25) and Sunday (Feb 27), both on D43. Week 9 * Ahead has 720 kbps passes on Tuesday, Mar 1 (D63), Wednesday, Mar 2 (D14 and D43), Thursday, Mar 3 (D63), and Friday, Mar 4 (D43), for a total of five 70 meter passes. There are 13 passes, and overall coverage is nominal. * A new data handling system will be uploaded to C&DH RAM on Mar 1 for Ahead, and Mar 2 for Behind. This is to add an additional APID for IMPACT to the realtime DFDs. These will be written to EEPROM two weeks later. * Behind has 720 kbps passes on Monday, Feb 28 (D63), Tuesday, Mar 1 (D63), and Saturday, Mar 5 (D14). There are 15 passes, and overall coverage is nominal. Week 10 * Daily savings time in U.S. starts Sunday, Mar 13. * The 36th momentum dump on Ahead will be carried out on Tuesday, Mar 8, with ignition at 16:00 UT. * The 30th momentum dump on Behind will be carried out on Thursday, Mar 10, with ignition at 19:45 UT. * A return-to-service track on Ahead will be performed using station 15 on Friday, Mar 11, shadowing a track on station 26. Current plans are to perform the uplink and downlink on station 15, using station 26 as the shadow track. * Ahead has 720 kbps passes on Monday, Mar 7 (D43), and Friday, Mar 11 (D63). There are 12 tracks during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Monday, Mar 7 (D43), Wednesday, Mar 9 (D14), Friday, Mar 11 (D14), and Sunday, Mar 13 (D14). There are 14 passes during the week, and overall coverage is nominal. Week 11 * Ahead has 720 kbps passes on Thursday, Mar 17 (D43), Friday, Mar 18 (D43), Saturday, Mar 19 (D14), and Sunday, Mar 20 (D14). There are 11 passes during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Monday, Mar 14 (D14), Friday, Mar 18 (D63), and Sunday, Mar 20 (D14). There are 12 passes during the week, and overall coverage is 2.1 hours above nominal. Week 12 * Ahead has 720 kbps passes on Tuesday, Mar 22, Wednesday, Mar 23, Thursday, Mar 24, and Sunday, Mar 27, all using station 43. There are 11 passes during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Wednesday, Mar 23 (D43 and D63), Thursday, Mar 24 (D63), Friday, Mar 25 (D63), and Sunday, Mar 27 (D43). There are 14 passes during the week, and overall coverage is 3.1 hours above nominal. Week 13 * Ahead has 720 kbps passes on Monday, Mar 28 (D43), Thursday, Mar 31 (D43), and Sunday, Apr 3 (D14). There are 12 passes during the week, and overall coverage is nominal. * Behind has a 720 kbps pass on Tuesday, Mar 29, using station 63. There are 14 passes during the week, and overall coverage is 5.3 hours above nominal. Week 14 * Ahead has 720 kbps passes on Monday, Apr 4 (D43), and Friday, Apr 8 (D14). There are 12 passes during the week, and overall coverage is nominal. * Behind has a 720 kbps pass on Monday, Apr 4, using station 63. There are 13 passes during the week, and overall coverage is 8.2 hours over nominal. Week 15 * Ahead has 720 kbps passes on Monday, Apr 11 (D14), Tuesday, Apr 12 (D43), Wednesday, Apr 13 (D14), Friday, Apr 15 (D14), Saturday, Apr 16 (D14), and Sunday, Apr 17 (D14), for a total of 6 passes. There are in all 9 passes during the week, and overall coverage is nominal. * Behind has no 720 kbps passes during the week. There are 13 passes during the week, and overall coverage is 6.6 hours above nominal. Other * There was some discussion about the operations of the SECCHI Special Event partition. When SECCHI-A had an event detection last week, the partition was only ~30% full. They would like to disable readout of SSR2 on both spacecraft until an event is detected, to ensure the best event data. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 07: M Feb 14 (045) T Feb 15 (046) W Feb 16 (047) T Feb 17 (048) F Feb 18 (049) Behind: 720 kbps downlink on station 14 S Feb 19 (050) S Feb 20 (051) ------------------------------------------------------------------------------- Scheduled activities for Week 08: M Feb 21 (052) Ahead: 720 kbps downlink on station 43 T Feb 22 (053) W Feb 23 (054) T Feb 24 (055) Ahead: 720 kbps downlink on station 43 F Feb 25 (056) Behind: 720 kbps downlink on station 43 S Feb 26 (057) S Feb 27 (058) Behind: 720 kbps downlink on station 43 ------------------------------------------------------------------------------- Scheduled activities for Week 09: M Feb 28 (059) Behind: 720 kbps downlink on station 63 T Mar 01 (060) Ahead: 720 kbps downlink on station 63 Behind: 720 kbps downlink on station 63 W Mar 02 (061) Ahead: 720 kbps downlink on station 14 and 43 T Mar 03 (062) Ahead: 720 kbps downlink on station 63 F Mar 04 (063) Ahead: 720 kbps downlink on station 43 S Mar 05 (064) Behind: 720 kbps downlink on station 14 S Mar 06 (065) ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 07 (066) Ahead: 720 kbsp downlink on station 43 Behind: 720 kbps downlink on station 43 T Mar 08 (067) Ahead: Momentum dump, 16:00 UT W Mar 09 (068) Behind: 720 kbps downlink on station 14 T Mar 10 (069) Behind: Momentum dump, 19:45 UT F Mar 11 (070) Ahead: Return-to-service track on station 15, shadowed by 26 Ahead: 720 kbsp downlink on station 63 Behind: 720 kbps downlink on station 14 S Mar 12 (071) S Mar 13 (072) Start of daylight savings time in US Behind: 720 kbps downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 14 (073) T Mar 15 (074) W Mar 16 (075) T Mar 17 (076) Ahead: 720 kbps downlink on station 43 F Mar 18 (077) Ahead: 720 kbps downlink on station 43 Messenger - Mercury orbital insertion S Mar 19 (078) Ahead: 720 kbps downlink on station 14 S Mar 20 (079) Ahead: 720 kbps downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 21 (080) T Mar 22 (081) Ahead: SECCHI stepped calibration roll, 9:15 UT Ahead: 720 kbps downlink on station 43 W Mar 23 (082) Ahead: 720 kbps downlink on station 43 Behind: 720 kbps downlink on stations 43 and 63 T Mar 24 (083) Ahead: 720 kbps downlink on station 43 Behind: 720 kbps downlink on station 63 F Mar 25 (084) Behind: 720 kbps downlink on station 63 S Mar 26 (085) S Mar 27 (086) Ahead: 720 kbps downlink on station 43 Behind: 720 kbps downlink on station 43 ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 28 (087) Ahead: 720 kbps downlink on station 43 T Mar 29 (088) Behind: 720 kbps downlink on station 63 W Mar 30 (089) T Mar 31 (090) Ahead: 720 kbps downlink on station 43 F Apr 01 (091) S Apr 02 (092) S Apr 03 (093) Ahead: 720 kbps downlink on station 14 ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Apr 04 (094) Ahead: 720 kbps downlink on station 43 Behind: 720 kbps downlink on station 43 T Apr 05 (095) W Apr 06 (096) T Apr 07 (097) F Apr 08 (098) Ahead: 720 kbps downlink on station 14 S Apr 09 (099) S Apr 10 (100) ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 11 (101) Ahead: 720 kbps downlink on station 14 T Apr 12 (102) Ahead: 720 kbps downlink on station 43 W Apr 13 (103) Ahead: 720 kbps downlink on station 14 T Apr 14 (104) F Apr 15 (105) Ahead: 720 kbps downlink on station 14 S Apr 16 (106) Ahead: 720 kbps downlink on station 14 S Apr 17 (107) Ahead: 720 kbps downlink on station 14 ------------------------------------------------------------------------------- Upcoming events: 2011: * 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 * Jul 25 Behind: Close approach by comet Elenin * 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