STEREO Weekly Meeting Minutes for 2009-03-10 (Week 11) ANNOUNCEMENTS ------------- * None. INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spacecraft is currently operating on IMU #2. * Behind is also operating on IMU #2 for testing. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 10 * Monitor data was lost during the station 54 Ahead track on day 61 (Mar 2), starting at 04:55. The connection was restored 15 minutes later. * Ahead tracks on days 62 (Mar 3) and 63 (Mar 4) were shortened from 5 to 3.8 and 3 hours respectively because of station 25 downtime. * On day 66 (Mar 7), the Ahead track on station 45 was only 2.6 hours because of Kepler launch support. The resulted in the loss of several hours of IMPACT and PLASTIC SSR data. * The average daily downlink was 5.1 gigabits on Ahead, because of the shortened tracks, and 6.6 gigabits on Behind. * On day 61 (Mar 2), telemetry lock was briefly lost during the Behind track on station 65. This resulted in the loss of some IMPACT SSR data. * On day 66 (Mar 7), during the Behind track on station 15, the transmitter tripped offline starting at 23:50 UT. A breaker was reset after the end of the track to clear the problem. This resulted in the loss of tracking data for most of the track, but no loss of SSR data. * SECCHI-Behind experienced a watchdog reset at 02:27 on day 65 (Mar 6). This is the 7th watchdog reset since launch. The problem was first brought to the attention of the SECCHI team by the spaceweather telemetry, and the instrument was recovered by 19:40 UT. * Because of the short pass durations and schedule uncertainty due to the Kepler launch, SECCHI ran a test of their planned schedule for 160 kbps on Ahead on Mar 6 and 7. Some problems were encountered with the processing of the COR1 and COR2 images where the planned binning did not occur. Also, the normal HI-1 cadence of 40 minutes was changed to 60 minutes. Week 11 * The 14th momentum dump on Behind was carried out yesterday (Mar 9), starting at 20:00 UT, imparting a momentum change of 0.054 m/s. * A SECCHI stepped calibration roll was carried out on Ahead today (Mar 10). * SECCHI-Ahead experienced the 9th watchdog reset today (Mar 10) at 08:36. Because of the track schedule, recovery is delayed until tomorrow. SECCHI's first priority is to get up and operating, which requires little commanding. File uploads can be delayed to a later track, if necessary. * The first HI 180 degree roll to examine the L4/L5 points is scheduled on Ahead for Thursday (Mar 12), starting at 05:30. The whole maneuver takes 6.5 hours, with 15 minutes to roll and settle at each end, and a dwell time of 6 hours. After some discussion it was decided to schedule future rolls to begin 10 minutes before the start of an even numbered hour to better match the HI-2 observation schedule. For this reason, the Behind maneuver on Mar 18 is rescheduled to start at 15:50 UT. * Behind will be at perihelion on Mar 11, at 15:28 UT. Week 12 * The first HI 180 degree roll on Behind is scheduled for Mar 18, starting at 15:50 UT. * SWAVES is still considering whether to do memory loads during either week 12 or week 13. Week 13 * The 20th momentum dump is scheduled for Ahead on Mar 25, at 14:30 UT. * The EIT shutterless campaign (JOP 80) is scheduled for Mar 27, and is combined with JOP 216 on polar plumes. Week 14 * The EIT shutterless campaign (JOP 80) is scheduled for Apr 2, and is combined with JOP 216 on polar plumes. Other * APL is gathering system requirements from the instrument teams for the planned G&C upgrades, when the instruments will be powered down and back up again. The upgrades are still in the process of being approved. The activity is tentatively scheduled to occur on Behind on May 12, when a 70 meter track is scheduled. The track duration is 7.5 hours, which may leave sufficient time to recover the instruments. IMPACT and PLASTIC report that their commanding will be intermittent, and can be shared with the other instrument teams. Some short periods of exclusive time for memory loads will be needed. PLASTIC points out that a similar operation was carried out on their instrument back in April. SWAVES reports that only a small amount of commanding should be required. The SECCHI team is still considering what their requirements would be, and what additional steps or testing would be required beyond that of a watchdog reset. * The G&C upgrades for Ahead would be scheduled later, in the June/July timeframe. * The dates for switching switching telemetry rates have been pushed back. * The launch date for the HERSCHEL sounding rocket has been postponed. A new launch date has not yet been scheduled. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 09 (068) Behind: Momentum dump, 20 UT T Mar 10 (069) Ahead: SECCHI stepped calibration roll, 01:20 UT W Mar 11 (070) T Mar 12 (071) Ahead: SECCHI HI 180 degree roll, 05:30 UT F Mar 13 (072) S Mar 14 (073) S Mar 15 (074) ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 16 (075) T Mar 17 (076) W Mar 18 (077) Behind: SECCHI HI 180 degree roll, 15:50 UT T Mar 19 (078) F Mar 20 (079) S Mar 21 (080) S Mar 22 (081) ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 23 (082) T Mar 24 (083) W Mar 25 (084) Ahead: momentum dump, 14:30 UT T Mar 26 (085) F Mar 27 (086) JOP 80, EIT shutterless (also JOP 216) S Mar 28 (087) S Mar 29 (088) Notes: * JOP 216, Multi-wavelength Observations of Oscillations in Polar Plumes ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Mar 30 (089) T Mar 31 (090) W Apr 01 (091) T Apr 02 (092) JOP 80, EIT shutterless (also JOP 216) F Apr 03 (093) S Apr 04 (094) S Apr 05 (095) Notes: * JOP 216, Multi-wavelength Observations of Oscillations in Polar Plumes ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: Mar 2-6, Apr 6-10, May 11-22, Jun 15-19, Jul 13-17, Aug 17-21 SECCHI Stepped calibration rolls Ahead: Mar 10, Jun 9, Sep 2, Nov 24 Behind: Apr 7, Jun 16, Sep 22, Dec 22 * Mar/Apr (TBD) ICAL14, Herschel sounding rocket launch http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf * Apr 8 Behind: Switch back to IMU #1 * Apr 15-29 SUMER campaign, JOPS 178,195,207,210,214,215,217,218,219 http://www.mps.mpg.de/services/campaignplanner/planning/campaign-200904/ Contact Davina Innes-Markiewicz for access * Apr 16 SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * Jun 1-Jul 10 Sunrise 5-day balloon flight http://star.mpae.gwdg.de/Sunrise/project/publicat/SPIE_2004.pdf * Jul 1 Both: HGA calibration * Jul 22 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009.html * 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 29 Messenger - Mercury fly-by * 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 * 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