STEREO Weekly Meeting Minutes for 2010-04-13 (Week 15) ANNOUNCEMENTS ------------- * None. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 14 * Macros were loaded to Ahead on day 97 (Apr 7) to support the 240 and 120 kbps telemetry rates. These macros are already loaded on Behind. The contingency star tracker macro was also loaded. * High winds at Goldstone caused intermittent lock problems during during the station 15 pass for Behind on day 95 (Apr 5). Eventually, the pass had to be ended 2.3 hours early to allow the antenna to be stowed. Playback was stopped before the end of track. This resulted in many intermittent gaps, and gaps of several hours over subsequent days as the partitions filled up. The SSR was finally emptied on day 100 (Apr 10). * A new DSN configuration was tested for the station 24 pass on Behind on day 97 (Apr 7) for the upcoming CDR replacement. * The 13th SECCHI stepped calibration roll was carried out on Behind on day 96 (Apr 6). * The contingency star macro was loaded to Behind on day 96 (Apr 6). * G&C software version 3.2.6 was loaded to EEPROM copy 1 on Behind on day 98 (Apr 8), and the pointer is now pointing to copy 1. * The average daily SSR downlink was 5.7 gigabits for Ahead, and 4.7 gigabits for Behind. Week 15 * A 4 hour return-to-service track on station 34 is scheduled on Ahead late Wednesday, Apr 14. No SSR playback is planned during this track. However, MOps may elect to active SSR playback during the pass, depending on the amount of data in the SSR buffers, and the status of the test. * G&C software version 3.2.6 will be loaded to EEPROM copy 1 on Ahead on Thursday, Apr 15. * PLASTIC reports getting a 1553 error message on PLASTIC-B. This also showed up as an IMPACT error. Week 16 * Switch to 7 hour DSN tracks for Ahead starting Apr 19. Some tracks will be shorter. Should expect to see more shorter tracks, but with additional tracks to make up the time. No tracks should be shorter than 3 hours. * The new macros for the 240 and 120 kbps telemetry rates will be tested for the last two hours of the station 15 pass on Ahead on Apr 19, starting at 17:00 UT. Four hours of commanding time are available to the instruments before the test if needed. * The 29th momentum dump will be carried out on Ahead on Wednesday, Apr 21, starting at 16:00 UT. * Ahead will have a 70 meter pass on station 43 on Thursday, Apr 22. This will be carried out at 720 kbps, and double playback of insitu data will be disabled. Week 17 * Switch to 240 kbps rate for Ahead starting Apr 26. * The 23rd momentum dump will be carried out on Behind on Tuesday, Apr 27, starting at 20:30 UT. * A SECCHI-driven GT calibration offpoint is planned for Wednesday, Apr 28, starting at 7:30 UT on both spacecraft. The amount of offpoint should be on the order of an arc minute. Week 18 * An SDO/EVE calibration sounding rocket launch is scheduled for Monday, May 3. This affected the Behind schedule due to SOHO support for the launch. More time has been negotiatied for STEREO to mitigate the schedule changes. * SECCHI/HI calibration offpoints are scheduled for Thursday, May 6, at 09:35 UT on Ahead, and 17:50 UT on Behind. The maximum offset is about 1.5 degrees about the spacecraft Y axis. Week 19 * 70 meter support is planned for both spacecraft on Monday, May 10. These will be carried out at 720 kbps, and double playback of insitu data will be disabled. Other * There was some discussion of a downward temperature excursion of about 1.5 degrees seen by SECCHI and some spacecraft monitors after the last momentum dump. The anomaly report for this is STA-2142. This is apparently caused by the -X panel heating up, lowering the heating cycle for the rest of the spacecraft. This is the same panel that the thrusters are mounted on. Similar excursions have been seen before, but not for as long. * A particular spectacular polar crown prominence eruption was seen today in the STEREO and SOHO coronagraphs, and should be visible in the EUVI 304 images when available. This eruption was not Earth directed, but may be headed toward the Ahead spacecraft. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 15: M Apr 12 (102) T Apr 13 (103) W Apr 14 (104) Ahead: Return-to-service track on station 34. No SSR playback T Apr 15 (105) F Apr 16 (106) S Apr 17 (107) S Apr 18 (108) ------------------------------------------------------------------------------- Scheduled activities for Week 16: M Apr 19 (109) Ahead: Begin 7 hour daily DSN tracks Ahead: Test of 240 and 120 kbps telemetry rates, 17:00 UT T Apr 20 (110) W Apr 21 (111) Ahead: Momentum dump, 16:00 UT T Apr 22 (112) Ahead: 720 kbps downlink on station 43 F Apr 23 (113) S Apr 24 (114) S Apr 25 (115) ------------------------------------------------------------------------------- Scheduled activities for Week 17: M Apr 26 (116) Ahead: Switch downlink rate to 240 kbps T Apr 27 (117) Behind: Momentum dump, 20:30 UT W Apr 28 (118) Both: SECCHI-driven GT calibration offpoint, 7:30 UT T Apr 29 (119) F Apr 30 (120) S May 01 (121) S May 02 (122) ------------------------------------------------------------------------------- Scheduled activities for Week 18: M May 03 (123) EVE calibration sounding rocket launch, 18:12 UT T May 04 (124) EVE calibration sounding rocket launch backup, 18:12 UT W May 05 (125) T May 06 (126) SECCHI HI stray light cal. offpoint, Ahead: 09:35, Behind: 17:50 F May 07 (127) S May 08 (128) S May 09 (129) ------------------------------------------------------------------------------- Scheduled activities for Week 19: M May 10 (130) Both: 720 kbps downlink T May 11 (131) W May 12 (132) T May 13 (133) F May 14 (134) S May 15 (135) S May 16 (136) ------------------------------------------------------------------------------- Upcoming events: 2010: ICAL-001: Mar 15-19, Apr 12-16, May 3-7 SECCHI Stepped calibration rolls Ahead: May 18, Aug 10, Nov 2 Behind: Jul 13, Oct 12 * Jun 8 SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * Jul 8,15 EIT shutterless (TBC) * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Aug 23 Ahead: End use of 720 kbps on 70 m DSN subnet * Sep 6 Behind: End use of 720 kbps on 70 m DSN subnet * 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 * Feb 6 STEREO spacecraft at 180 degree separation * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul DAWN - Vesta arrival * Jul 13 Both: HGA calibration * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 9 Behind: End use of 480 kbps on 70 m DSN subnet * Jan 11 Both: HGA calibration * Jun 25 Ahead: End use of 480 kbps on 70 m DSN subnet * Jul DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug 20 Both: Switch downlink rate to 30 kbps * Nov 13 Total solar eclipse, south Pacific 2013: * Nov 25 Behind: End use of 360 kbps on 70 m DSN subnet * Dec 12 Ahead: Mercury transit 2014: * Apr 29 Behind: Mercury transit 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * May 25 Ahead: End use of 360 kbps on 70 m DSN subnet * Aug 10 Ahead: Begin use of 360 kbps on 70 m DSN subnet * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission 2016: 2017: 2018: * Mar 5 Ahead: Mercury transit