STEREO Weekly Meeting Minutes for 2011-02-08 (Week 06) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 5 * On day 033 (Feb 2), during the DSS 65 support for Ahead, a DCD anomaly occurred at 0846z. This resulted in the loss of seven minutes of real-time telemetry and ranging data. All SSR data were recovered. See DR# N107102 for more information. * On day 032 (Feb 1), the 16th SECCHI stepped calibration on Ahead, at the aphelion/perihelion midpoint, was executed. This counts as both the midpoint roll, and the roll requested by SECCHI for the 180 degree separation. * On day 037, the AHEAD and BEHIND S/C reached 180 degrees angular separation. Week 6 * The 16th SECCHI stepped calibration roll for Behind was carried out this morning (Feb 8). This serves as both the midpoint roll, and the roll for 180 degree separation. * Ahead has a 720 kbps pass on Wednesday, Feb 9, on station D43. There are 14 passes during the week, and overall coverage is nominal. * Behind has 720 kbps passes on Saturday, Feb 12, and Sunday, Feb 13, both using station D63. There are 11 passes during the week, and overall coverage is nominal. Week 7 * Ahead has no 720 kbps passes. There are 12 passes during the week with 2.1 hours over baseline coverage. * Behind has a 720 kbps pass using D14 starting Friday Feb 18. There are 12 passes during the week, and overall coverage is nominal. Week 8 * Ahead has 720 passes on Monday (Feb 21) and Thursday (Feb 24) on D43. There are 13 passes during the week, and overall coverage is nominal. * Behind has a 720 pass on Sunday (Feb 27) on D43. There are 15 tracks during the week (some very short), and there are 5.4 hours over baseline coverage. Week 9 * Ahead has 720 kbps passes on Tuesday, Mar 1 (D63), Wednesday, Mar 2 (D14 and D43), Thursday, Mar 3 (D63), Friday, Mar 4 (D43), and Sunday, Mar 6 (D14), for a total of six 70 meter passes. There are 13 passes, and overall coverage is nominal. * Behind has two 720 kbps passes (both D63) on Monday and Tuesday. There are 16 passes, and 4.8 hours over baseline. 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. Other * APL is still looking into recent data gaps reported by SECCHI. Some of these data have been found, and will show up in the 30-day final data set, if not before. There has been a learning curve with the new DCD system. APL has been tracking data completeness, and follows up on gaps which cannot be attributed to known problems. * The downlink performance product is almost ready. This is intended to show the effect of weather on the downlink. * Testing will begin soon on CCSDS Space Link Extension (SLE) telemetry. Up until now STEREO has been SLE compliant on downlink, but not on commanding. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 05: M Jan 31 (031) T Feb 01 (032) Ahead: SECCHI stepped calibration roll, 13:15 UT Behind: 720 kbps downlink on station 63 W Feb 02 (033) T Feb 03 (034) Ahead: 720 kbps downlink on station 63 Ahead: Downlink only pass on station 26 F Feb 04 (035) Behind: 720 kbps downlink on station 63 Behind: Downlink only pass on station 26 S Feb 05 (036) S Feb 06 (037) STEREO spacecraft at 180 degree separation Behind: 720 kbps downlink on stations 63 and 14 ------------------------------------------------------------------------------- Scheduled activities for Week 06: M Feb 07 (038) T Feb 08 (039) Behind: SECCHI stepped calibration roll, 9:45 UT W Feb 09 (040) Ahead: 720 kbps downlink on station 43 T Feb 10 (041) F Feb 11 (042) S Feb 12 (043) Behind: 720 kbps downlink on station 63 S Feb 13 (044) Behind: 720 kbps downlink on station 63 ------------------------------------------------------------------------------- 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) 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) S Mar 06 (065) Ahead: 720 kbps downlink on station 14 ------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- 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 * 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