STEREO Weekly Meeting Minutes for 2007-06-26 (Week 26) ANNOUNCEMENTS ------------- * None. INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spececraft is currently operating on IMU #2. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 25 * The Ahead pass on day 169 was 15 minutes late acquiring the signal. No ranging data was available during this pass. * There were transmitter problems during the Ahead pass on day 172. The uplink was dropped twice. Five SECCHI commands did not go up, and were retransmitted the next day. * The average daily downlink was 7.3 gigabits on Ahead, and 7.9 gigabits on Behind. * Lock status warnings occured during the station 34 Behind pass on day 170. This led to small data gaps in the playback. * The Behind pass on day 172 was late acquiring the signal. The SSR playback was restarted, and no data was lost. Week 26 * IMU alignments were updated on both spacecraft. * A new autonomy rule was loaded on Ahead to disable GT rates if SECCHI reboots. * A test will be made on Ahead tomorrow (Wednesday, day 178) of disabling the IMU and running on the star tracker. This may affect jitter performance. The test will start 8:30 A.M. EDT. * New software is being uploaded today (day 177) for PLASTIC on Ahead. The SSC reports that PLASTIC beacon processing may be temporarily disrupted because of the change in telemetry format. Week 27 * A momentum dump is scheduled for Ahead on Thursday, day 186. * A software load for PLASTIC on Behind is scheduled for day 183. * DAWN is scheduled for launch on Saturday, July 7. Week 28 * The Ahead playback on day 190 will be scheduled to accommodate both the nominal track plan and the contingency track plan in case the DAWN launch slips one day. The science playback will be 40 minutes shorter than normal. The times between this track and the preceeding and following tracks are in the range of 24-25 hours. * If DAWN slips two days, then the only the schedule for day 208 changes, and only by 5 minutes. * HGA calibrations on both spacecraft on day 192. The tracks start at 11:30 and 15:50 respectively, and the HGA calibrations will be close to the beginning of the track. Other * SECCHI has sent two requests for special operations to the MOC. The first request is that the IMU be operated with the GT disabled for 5 minutes to assess jitter performance under those conditions. The second test is for a calibration maneuver consisting of a series of spacecraft-driven offpoints. Both tests are to explore possible solutions to the excess stray light in the COR2 telescopes. * The STEREO planning calendar at http://stereo-ssc.nascom.nasa.gov/plans.shtml now includes information about Hinode and TRACE eclipse seasons. * A number of coordinated observations are coming up that involve STEREO/SECCHI data. JOP 188 to study prominence mass composition and variability will run from July 1 to August 5. The SECCHI team reported that they were aware of this JOP, but had heard little from the JOP coordinator. Terry Kucera, who is one of the JOP collaborators, reported that the normal SECCHI synoptic program would meet the requirements of the JOP. There may be some interest in having extra special event buffer data coordinated with Hawaii observing time as in the IHY campaign below. The SECCHI team would need to know several days ahead of time, and will not be able to support this before the second week of July because of staffing issues. * An IHY campaign to study filaments is scheduled from August 5 to 18. The start date for this campaign may slip a few days to avoid starting on a weekend. The campaign team requests SECCHI to coordinate the data in their special event partition with observing time at the Mauna Loa Mark IV coronagraph in Hawaii. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 25 (176) T Jun 26 (177) Ahead: PLASTIC software load W Jun 27 (178) Ahead: Test of Macro 145 -- may affect fine pointing Ahead: PLASTIC software load (contingency) T Jun 28 (179) F Jun 29 (180) S Jun 30 (181) S Jul 01 (182) Start of JOP 188 Notes: * JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5 ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jul 02 (183) JOP 188 continues Behind: PLASTIC software load T Jul 03 (184) Behind: PLASTIC software load (contingency) W Jul 04 (185) T Jul 05 (186) Ahead: Momentum dump, 13:00 UT F Jul 06 (187) S Jul 07 (188) S Jul 08 (189) Notes: * JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5 * DAWN launch scheduled for July 7 ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 09 (190) JOP 188 continues T Jul 10 (191) W Jul 11 (192) Both: HGA calibrations T Jul 12 (193) F Jul 13 (194) S Jul 14 (195) S Jul 15 (196) Notes: * JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5 ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 16 (197) T Jul 17 (198) W Jul 18 (199) T Jul 19 (200) F Jul 20 (201) S Jul 21 (202) S Jul 22 (203) Notes: * JOP 188, Prominence Mass Composition and Variability Study, Jul 1-Aug 5 ------------------------------------------------------------------------------- Upcoming events: 2007: * May 7 -Aug 10 Hinode eclipse season * May 24-Jul 16 TRACE summer eclipse season (dates TBC) * Jul 1 -Aug 5 JOP 188, Prominence Mass Composition and Variability * Aug 5-18 Filament/Cavity-CME-ICME IHY-CIP campaign, (CIPs 7,21,23,51) * Aug 19 Ulysses ecliptic plane passage * Oct 22 - Nov 2 SUMER campaign (JOPs 190,191,192,193) * Dec 2007-May 2008 Ulysses quadrature