STEREO Weekly Meeting Minutes for 2009-05-12 (Week 20) ANNOUNCEMENTS ------------- * NASA project management approval was given for the loading and activation of the new G&C flight software version 3.2.6 to the STEREO Behind observatory. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spacecraft is currently operating on IMU #2. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 19 * AOS was 6 minutes late during that station 54 pass on Ahead on day 125 (May 5) because the azimuth brakes were not releasing. This resulted in the loss of a few minutes of Doppler data. No SSR data were lost. * An unexpected SECCHI reset on Ahead occured on day 125 (May 5) at 05:35:50 during the station 54 pass. Recovery was completed at 08:35 UT the next day. * Voice communication was lost with station 24 during the Behind pass on day 125 (May 5), from 03:30-06:00 UT, due to problems at JPL. Communications were restored before the start of the next track. * Telemetry lock was intermittent during the station 54 pass on Behind on day 127 (May 7), between 17:04-20:47. This resulted in minor data loss. * The third SECCHI/HI 180 degree roll on Behind was executed on day 126 (May 6) at 17:50 UT. * G&C FSW version 3.2.6 was loaded to Copy 2 in EEPROM on Behind on day 127 (May 7) in preparation for the G&C reset. * The average daily downlink was 5.5 gigabits on Ahead, and 6.0 gigabits on Behind. Week 20 * The 21st momentum dump was carried out on Ahead this morning (May 12), starting at 13:30 UT. * A software load is scheduled for SWAVES-Ahead on Thursday morning. * Preparations are underway for the Behind reset this evening (May 12). During the next track, the IMPACT, PLASTIC, and SECCHI teams will prepare to power down. Around 4:30 this afternoon, the MOC will poll all the teams for readiness before sending the time-tagged commands to power down the instruments. * During the following contact, the MOC will watch the instruments turn off via the time-tagged commands. IMPACT and PLASTIC will turn off at 23:00, followed by SECCHI at 23:05 and SWAVES at 23:10. Polling will then take place before sending the system reset command, which will send the spacecraft into boot mode, and from there to EA mode. In EA mode, the spacecraft will roll at 5 degrees per minute. * Once the spacecraft is stabilized at the correct orientation, the telemetry rate will be commanded from 11 kbps to 633 kbps. Then the star tracker will be powered on, and the spacecraft rotated again to the -Z side. The HGA will then be enabled, and instrument recovery can then start. This is expected to occur sometime around midnight EDT. SWAVES and SECCHI will power on first, followed by the IMPACT IDPU and the boom suite, and then PLASTIC. All the instruments will share the command link. The round trip light time is around 13.5 minutes. * IMPACT would like to send a command or two soon after powering on to turn on the SWEA heater. This is okay with the SECCHI and SWAVES teams, who will be commanding at the time. * The next pass after that will be tomorrow evening (May 13), starting at 7:30 EDT. * Additional commanding is scheduled for IMPACT/SEPT on Thursday and Friday nights (May 14,15). * SWAVES will be performing a software load to Behind on Wednesday night (May 13). This will last for two hours and will take up half of the telemetry rate. The other instrument teams will be sharing the link, sending only intermittent commands of a few packets at a time. SECCHI plans to spread their commanding over the track. COP1 will be disabled, speeding up the commanding. * DSN comments that station 14 had a break in the azimuth control soon after some shimming activities. It took 11 minutes to get control back. This has been known to happen sometimes after shimming activities. Last night this occured at 250 azimuth. The DSN team will check to see if STEREO Behind will traverse this azimuth during the recovery activities. Week 21 * Tracks on Wednesday and Thursday will serve as backup times for the SWAVES software load on Ahead. * There is also a backup opportunity for SWAVES-Behind on Wednesday. Week 22 * The fourth HI 180 degree rolls are scheduled for both Ahead and Behind on day 147 (May 27). The Ahead roll will start at 13:50 and the Behind roll will start at 17:50. Week 23 * The 16th momentum dump on Behind is scheduled for June 4th, starting at 15:00 UT. * The MOC is watching the LRO launch situation. LRO launch is currently scheduled for June 2. If it slips past this date, it could affect the DSN schedules. * The Ahead pass on Thursday, June 4 is shorter than usual (3 hours), due to the planned LRO launch. Other * No date has been set yet for the reset on Ahead. This is expected to occur sometime in August or early September. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 20: M May 11 (131) T May 12 (132) Ahead: Momentum dump, 13:30 UT Behind: Spacecraft reset for G&C update. Preparations for power-down start at 18:30 UT W May 13 (133) Behind: Recovery from G&C reset. T May 14 (134) F May 15 (135) S May 16 (136) S May 17 (137) ------------------------------------------------------------------------------- Scheduled activities for Week 21: M May 18 (138) T May 19 (139) W May 20 (140) T May 21 (141) F May 22 (142) S May 23 (143) S May 24 (144) ------------------------------------------------------------------------------- Scheduled activities for Week 22: M May 25 (145) T May 26 (146) W May 27 (147) SECCHI HI 180 degree rolls, Ahead: 13:50, Behind: 17:50. T May 28 (148) F May 29 (149) S May 30 (150) S May 31 (151) ------------------------------------------------------------------------------- Scheduled activities for Week 23: M Jun 01 (152) T Jun 02 (153) W Jun 03 (154) T Jun 04 (155) Behind: Momentum dump, 15:00 UT F Jun 05 (156) S Jun 06 (157) S Jun 07 (158) ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: May 11-22, Jun 15-19, Jul 13-17, Aug 17-21, Sep 14-18, Oct 12-16 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 * 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 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 (TBC) SUMI sounding rocket launch 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 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