STEREO Weekly Meeting Minutes for 2014-03-04 (Week 10) ANNOUNCEMENTS ------------- * The IMPACT/MAG instrument on Behind was recovered on Feb 25. See below for details. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 09 (Feb 24-Mar 2) * On day 059 (Feb 28), during the DSS-14 support for Ahead, turbo decoder lock was lost intermittently beginning at 1902z through 1904z. This anomaly resulted in the loss of 2786 frames of SSR data. A DR has been requested. This is roughly equivalent to about 40 minutes of data. * On day 061 (Mar 2), during the DSS-65 support for Ahead, turbo decoder lock was lost intermittently beginning at 1512z through 1514z. This anomaly resulted in the loss of two frames of SSR data. * On day 056 (Feb 25), MOps permanent macro release 1.1.18 was loaded to C&DH RAM on Ahead. This release modified MOps macros to suppress invalid telemetry indications when the IMU is not powered. * On day 058 (Feb 27), the SECCHI instrument on Ahead reset at 09:54:51z. The SECCHI team reconfigured the instrument to operational mode at 1705z. This was the 33rd reset of SECCHI on the Ahead spacecraft. * On day 055 (Feb 24), during the DSS-26 support for Behind, turbo decoder lock was lost briefly at 056-0101z. This anomaly resulted in the loss of one frame of SSR data. * On day 056 (Feb 25), during the DSS-14 support for Behind, turbo decoder lock was lost intermittently between 057-0057z and 0100z. This anomaly resulted in the loss of three frames of SSR data. * On day 057 (Feb 26), during the DSS-26 support for Behind, initial telemetry was established 0.7 hours late due to a database problem at the station. This anomaly resulted in the loss of 0.7 hours of SSR data as well as 344 frames of SSR data that resulted from the subsequent late uplink sweep. See DR #G114717 for more information. * On day 059 (Feb 28), during the DSS-43 support for Behind, turbo decoder lock was lost intermittently between 0608z and 0609z, then again between 0634z and 0639z. This anomaly resulted in the loss of 427 frames of SSR data. See DR# N109470 for more information. * On day 059 (Feb 28), during the DSS-25 support for Behind, initial telemetry was established 0.3 hours late due to a transmitter problem at the station. All SSR pointers were repositioned to recover data lost during the anomaly. See DR# G114728 for more information. Later in the track, turbo decoder lock was lost intermittently between 0600015z and 0043z due to rain. This anomaly resulted in the loss of 9130 frames of SSR data. See DR# G114730 for more information. * On day 061 (Mar 2), during the DSS-43 support for Behind, turbo decoder lock was lost intermittently between 0555z and 0602z. This anomaly resulted in the loss of 46 frames of SSR data. * On day 056 (Feb 25), the IMPACT IDPU/MAG and SWEA power services on Behind were powered cycled at 2241z which cleared the MAG instrument anomaly that occurred on 051-0300z. Subsequently, the IDPU stopped receiving data from the PLASTIC instrument. On day 057, the IDPU was soft reset at 2231z which restored the connectivity of the PLASTIC instrument. The issue which interfered with the PLASTIC connectivity is understood, and shouldn't happen again. The procedure successfully avoided taking down the high voltages on the detectors. After the PLASTIC recovery, there were reports of noisy data in the PLASTIC products; however, this is believed to be due to a proton storm that was visible in the SECCHI images at the time. * On day 058 (Feb 27), the 60th momentum dump was executed successfully on Behind at 0030Z, which imparted a delta V of 0.0822 m/sec. * On day 058 (Feb 27), the full Reduced Gyro Operations (RGO) fault protection capability, consisting of fault protection release 2.3.13 and MOps macro permanent release 1.1.19, was loaded to C&DH RAM and enabled on the Behind observatory at 1533z. The RGO extends the life of the remaining IMU by keeping it off most of the time and turning it on only when high rate data is required, such as the periodic momentum dumps, instrument roll calibrations, and spacecraft safety. There is still a minor tweak for the Ahead spacecraft; uploading this hasn't been scheduled yet. * The average daily SSR playback volume during the week was 3.6 gigabits on Ahead, and 3.7 gigabits on Behind. Week 10 (Mar 3-9) * There is a move of the restricted IONET backup equipment tomorrow (Mar 5) at around 18:00 UT. This is not expected to impact operations. * Daylight saving time in the U.S. begins Mar 9 07:00 UT. * Ahead has 11 passes during the week, and overall coverage is short 14 hours, mainly between Tuesday-Thursday, Mar 4-6. 70 meter tracks are scheduled for Monday, Mar 3 (D14), and Thursday, Mar 6 (D43 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, Mar 6 (D55), Saturday, Mar 8 (D34, D55, D26), and Sunday, Mar 9 (D45). * Behind has 14 passes during the week, and overall coverage is short 4.2 hours, mainly between Tuesday-Wednesday, Mar 4-5. There are two 70 meter passes, on Thursday, Mar 6 (D14), and Friday, Mar 7 (D14). Passes will be conducted at 160 kbps on the following dates: Monday, Mar 3 (D45, D26), Tuesday, Mar 4 (D26), Wednesday, Mar 5 (D26, D55), Thursday, Mar 6 (D26), and Saturday, Mar 8 (D26). * There is currently no agreement in place to use ESA passes after February. Negotiations are still ongoing. Week 11 (Mar 10-16) * The MOPS updates on Ahead will be promoted to EEPROM. * Ahead has 13 passes during the week, and overall coverage is short 6.4 hours, mainly between Monday-Wednesday, Mar 10-12. 70 meter passes are scheduled for Tuesday, Mar 11 (D14 at 720 kbps), and Thursday, Mar 13 (D14). The following passes will be carried out at 160 kbps: Monday, Mar 10 (D34), Friday, Mar 14 (D55 and D24), and Sunday, Mar 16 (D25). * Behind has 14 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Wednesday, Mar 12, and Friday, Mar 14 (D43 at 720 kbps). The following passes will be carried out at 160 kbps, all using station 26: Monday, Mar 10, Friday, Mar 14, and Sunday, Mar 16. Week 12 (Mar 17-23) * Ahead has 8 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Tuesday, Mar 18 (D14). * Behind has 10 passes during the week, and overall coverage is short 4 hours, with shortages from Wednesday-Friday (Mar 19-21). There is a 70 meter pass scheduled on Saturday, Mar 22 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, Mar 20 (D26), and Sunday, Mar 23 (D26). Week 13 (Mar 24-30) * A momentum dump on Ahead is scheduled for Wednesday, Mar 26, with ignition at 23:30 UT. * The 28th SECCHI stepped calibration roll on Behind is scheduled for Tuesday, Mar 25, starting at 16:40 UT. The system momentum will be about 5 N-m-s. * Ahead has 10 passes during the week, and overall coverage is nominal. A 70 meter pass is scheduled for Wednesday, Mar 26 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Mar 24 (D26), Tuesday, Mar 25 (D24), and Thursday, Mar 27 (D25). * Behind has 11 passes during the week, and overall coverage in nominal. There are three 70 meter passes scheduled: Monday, Mar 24 (D43, D14 at 720 kbps), and Tuesday, Mar 25 (D14). The following passes will be carried out at 160 kbps: Thursday, Mar 27 (D55), Friday, Mar 28 (D26), Saturday, Mar 29 (D26), and Sunday, Mar 30 (D26). Week 14 (Mar 31-Apr 6) * The 61st momentum dump on Behind is scheduled for Wednesday, Apr 2, starting at 15:30 UT. * A Project Interface Test (PIT) with station 25 is scheduled for Behind on Thursday, Apr 3. * A Return-to-service test with Behind with station 63 is scheduled for Saturday, Apr 5. * Ahead has 11 passes during the week, and overall coverage is short 13.3 hours, mainly between Monday-Thursday, Mar 31-Apr 3. 70 meter passes are scheduled for Friday, Apr 4 (D14 at 720 kbps), and Sunday, Apr 6 (D43). The following passes will be carried out at 160 kbps, all using station 26: Monday, Mar 31, Wednesday, Apr 2, and Saturday, Apr 5. The station 26 pass on Sunday, Apr 6, will be carried out at 240 kbps. * Behind has 8 passes during the week, and overall coverage is short 6.4 hours, mainly between Wednesday-Thursday, Apr 2-3. 70 meter passes are scheduled for Monday, Mar 31 (D14 at 720 kbps), and Sunday, Apr 6 (D43). The following passes will be carried out at 160 kbps: Tuesday, Apr 1 (D26), and Wednesday, Apr 2 (D55). Other * MOC plans for the solar conjunction will be presented at the upcoming SWG on Mar 31. If possible, the materials will be distributed in advance. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 03 (062) T Mar 04 (063) W Mar 05 (064) T Mar 06 (065) F Mar 07 (066) S Mar 08 (067) S Mar 09 (068) Daylight saving time starts Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 10 (069) T Mar 11 (070) W Mar 12 (071) T Mar 13 (072) F Mar 14 (073) S Mar 15 (074) S Mar 16 (075) Notes: * Significant telemetry shortages are expected for the Ahead spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 17 (076) T Mar 18 (077) W Mar 19 (078) T Mar 20 (079) F Mar 21 (080) S Mar 22 (081) S Mar 23 (082) Notes: * Significant telemetry shortages are expected for the Behind spacecraft during the week. ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 24 (083) T Mar 25 (084) Behind: SECCHI stepped calibration roll, 16:40 UT W Mar 26 (085) Ahead: Momentum dump, 23:30 UT T Mar 27 (086) F Mar 28 (087) S Mar 29 (088) S Mar 30 (089) ------------------------------------------------------------------------------- Scheduled activities for Week 14: M Mar 31 (090) T Apr 01 (091) W Apr 02 (092) Behind: Momentum dump, 15:30 UT T Apr 03 (093) Behind: PIT test with station 25 F Apr 04 (094) S Apr 05 (095) Behind: Return-to-service test with station 63 S Apr 06 (096) Notes: * Significant telemetry shortages are expected for both spacecraft during the week. ------------------------------------------------------------------------------- Upcoming events: 2014: * Apr 29 Behind: Mercury transit * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * Oct 17 Behind: Comet Siding Spring encounter with Mars 2015: * Jan 14 - Mar 19 (TBC) Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * Feb 11 - Jul 08 (TBC) Ahead: Spacecraft behind Sun * Aug 25 - Oct 19 (TBC) Behind: Possible interference from Sun * Jul DAWN - End of nominal mission 2016: * Jul Juno arrival at Jupiter 2017: * Jul 11 Ahead: Switch downlink rate to 160 kbps * Jul 22 Behind: Switch downlink rate to 160 kbps 2018: * Mar 5 Ahead: Mercury transit