STEREO Weekly Meeting Minutes for 2009-06-23 (Week 26) ANNOUNCEMENTS ------------- * The STEREO Science Center website is temporarily unavailable. In the meantime, many of the data can be retrieved through the anonymous ftp server at stereoftp.nascom.nasa.gov. * Autonomy rules 19,62,63 fired on Behind on day 172. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 25 * APL is still recovering from the temporary internet outage which began on day 165 (Jun 14). Because of the continuing problems, all tracks are currently being staffed. * IMPACT had problems commanding on day 166 (Jun 15) because of the internet problems. Commanding was successfully accomplished the next day (Jun 16). * The fifth HI 180 degree rolls were carried out on both spacecraft on day 168 (Jun 17), at 01:50 for Ahead, and 15:50 for Behind. * IMPACT and PLASTIC both successfully commanded from their POCs on day 170 (Jun 19). * Telemetry lock was intermittent for an unknown reason during the Behind pass on station 54 on day 167 (Jun 16) between 17:31 and 17:38. This resulted in the loss of some SSR data for all instruments. Discrepency report N-105326 was submitted. * The 10th SECCHI stepped calibration roll on Behind occurred on day 167 (Jun 16) at 11:30. This was the midpoint roll. * On day 172 (Jun 21), autonomy rules 19,62,63 fired on the Behind spacecraft at the start of the day because of a G&C inertial attitude knowledge condition. This was determined to be because the coarse ephemeris expired. This ephemeris was loaded as part of the system reset on day 132 (May 12). It was planned that this would be updated as part of the normal planning process, but there was a 5-day offset in the planning. The autonomy rules performed as designed, and the spacecraft remained in operation mode without problems. These autonomy rules are the same as were on the spacecraft before the reset. An anomaly report has been submitted. * The average SSR daily downlink was 5.7 gigabits for Ahead, and 6.4 gigabits for Behind. Week 26 * The 22nd momentum dump on Ahead is scheduled for Thursday, Jun 25, starting at 20:00. * There are several shorter than usual tracks this week. The Ahead track on Monday (Jun 22) was 4.7 hours, and the Behind track this morning (Jun 23) was 3.3 hours. The Ahead track on Wednesday, day 175 (Jun 24) will be 4.2 hours. Now that LRO has been successfully launched, no more short tracks are anticipated. Week 27 * The tenth high gain antenna calibrations are scheduled for Behind at 17:00 UT on day 182 (Jul 1), and for Ahead at 14:00 UT on day 183 (Jul 2). These will be the first calibrations using the recommended reduced roll and gimbal ranges of +/- 0.5 degrees. Other * No date has been set yet for the reset on Ahead. This is expected to occur sometime in August, possibly in the first week. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 22 (173) T Jun 23 (174) W Jun 24 (175) T Jun 25 (176) Ahead: Momentum dump, 20:00 UT ICAL 1: 12 UT F Jun 26 (177) S Jun 27 (178) S Jun 28 (179) ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jun 29 (180) T Jun 30 (181) W Jul 01 (182) Behind: HGA calibration, 17:00 UT T Jul 02 (183) Ahead: HGA calibration, 14:00 UT EIT shutterless, 17-20 UT F Jul 03 (184) S Jul 04 (185) S Jul 05 (186) ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: Jun 15-19, Jul 13-17, Aug 17-21, Sep 14-18, Oct 12-16, Dec 14-18 SECCHI Stepped calibration rolls Ahead: Jun 9, Sep 2, Nov 24 Behind: Jun 16, Sep 22, Dec 22 * Mar 16-Sep LASCO C2pB for Tomography Reconstruction * Mar 27-... JOP 222, Origin of SEPS, Target of opportunity * Jul 21 (TBC) ICAL14, Herschel sounding rocket launch, 19:10 UT http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf * Jul 22 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009.html * Jul 28 (or 29) SUMI sounding rocket launch, 19:10 UT http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * Aug 10 Both: Begin 6 hour daily DSN tracks * Aug 17 Ahead: Switch downlink rate to 360 kbps * Sep 8 Behind: Switch downlink rate to 360 kbps * Sep 10 Ahead at L4 Lagrange point * Sep 27-Oct 27 JOP 224, Solar Tomography with Minimal Solar Rotation * Sep 29 Messenger - Mercury fly-by * Oct 8,15 EIT shutterless (TBC) * Oct 26 Behind at L5 Lagrange point * Nov 1-Dec 15 SUMER campaign (TBC) * Nov 30 Behind: Begin 7 hour daily DSN tracks * Dec 7 Behind: Switch downlink rate to 240 kbps 2010: SECCHI Stepped calibration rolls Ahead: Feb 23, May 18, Aug 10, Nov 2 Behind: Apr 6, Jul 13, Oct 12 * Jan 6 Both: HGA calibration * Jan 7,15 EIT shutterless (TBC) * Apr 19 Ahead: Begin 7 hour daily DSN tracks * Apr 26 Ahead: Switch downlink rate to 240 kbps * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Sep 7 Both: Begin 8 hour daily DSN tracks * Sep 13 Both: Switch downlink rate to 160 kbps * Nov 15 Behind: Switch downlink rate to 120 kbps 2011: * Jan 12 Both: HGA calibration * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul 13 Both: HGA calibration * Aug DAWN - Vesta arrival * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 11 Both: HGA calibration * May DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug Both: Switch downlink rate to 30 kbps 2013: 2014: 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission