STEREO Weekly Meeting Minutes for 2014-06-17 (Week 25) ANNOUNCEMENTS ------------- * See the discussion below about solar conjunction operation testing during week 28. INSTRUMENT and SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 24 (Jun 9-15) * On day 160, as DSS-14 was declared red, switched over to use DSS-26. Initial commanding was delayed an hour sue to a processing issue at the DSN. Commands were then uplinked to reconfigure the downlink to 240 kbps, reconfigure the SSR playback, and move back SSR pointers. SSR playback volume was greatly reduced as the track was shortened and the downlink rate reduced from 720 kbps to 240 kbps which resulted in SECCHI and SWAVES data loss on day 163. See DR #G115103 for more information. * On day 161, during the DSS-24 support, downlink acquisition was delayed 30 minutes due to DSS-24 link-build problems. On uplink acquisition, commands were uplinked to move back SSR pointers. This anomaly resulted in the loss of two frames of SSR data at 2118z. See DR #G115107 for more information. * On day 161, C&DH FSW version 3.2.4 was loaded to EEPROM, copy 2, in preparations for solar conjunction testing. * On day 161, during the DSS-55 support, turbo decoder lock was lost at 1407z. This anomaly resulted in the loss of four frames of SSR data. * On day 163, the SSR science partitions filled as follows due to the loss of the 70 meter support on day 160: SECCHI (Part 19) remained 100% full at 0916z for 3.5 hours SWAVES (Part 13) remained 100% full at 1020z for 2.4 hours * On day 164, a HGA operational side lobe test was executed successfully at 0600z through 0730z during the DSS-63 support to validate the performance of data rates for HGA offpointing and on the first and second HGA side lobes in preparations for use during the solar conjunction mission phase. For 30 minutes each, the HGA was offpointed one degree using a 360 kbps downlink and 2000 bps uplink, then slewed to the first HGA side lobe using a 10 kbps downlink and 500 bps uplink rates, and finally slewing the HGA to the second side lobe using a 3 kbps downlink and 125 bps uplink rates on the AHEAD observatory. Ranging lock was intermittent throughout the test. RF performance is being analyzed. * On day 164, during the DSS-55 support, telemetry was lost beginning at 0823z through 0839z due to the telemetry block count not updating in the Receiver, Ranging, and Telemetry Processor. The SSR pointers were repositioned to recover the data. Later in the support, turbo decoder lock was lost intermittently beginning at 1244z through 1304z. The turbo decoder anomaly resulted in the loss of 3988 frames of SSR data. See DR# M108025 for more information. * On day 166, during the DSS-25 support, command bind was lost at 1551z due to a two second modulation error. The command bind was re-established at 1633z and this anomaly had no impact on operations. See DR# G115135 for more information. * The average daily SSR playback volume during the week was 4.1 gigabits on Ahead, and 4.5 gigabits on Behind. Week 25 (Jun 16-22) * Station 14 and 26 tracks on Sunday, Jun 22, were switched between Ahead and Behind for sufficient 70 meter coverage on Ahead. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes, both at 720 kbps, are scheduled for Saturday, Jun 21 (D43), and Sunday, Jun 22 (D14). The following passes will be carried out at 160 kbps: Thursday, Jun 19 (D55), Friday, Jun 20 (D65), and Saturday, Jun 21 (D65). The following station 26 passes will be carried out at 240 kbps: Wednesday, Jun 18. * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 16 (D63), and Friday, Jun 20 (D63 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Jun 16 (D65), Tuesday, Jun 17 (D55), Wednesday, Jun 18 (D55), Thursday, Jun 19 (D54), and Saturday, Jun 21 (D25). The station 26 pass on Sunday, Jun 22, will be carried out at 240 kbps. Week 26 (Jun 23-29) * MOPS macros version 1.1.21 and fault protection rules version 2.3.14 will be written to EEPROM on Ahead on Monday, Jun 23. * Mission operations spacecraft testing readiness review Thursday Jun 26 for Ahead, in preparation for the solar conjunction operations test Jul 7-13. * Ahead has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Thursday, Jun 26 (D43), Friday, Jun 27 (D63, D14 at 720 kbps), and Saturday, Jun 28 (D63 at 720 kbsp). The following passes will be carried out at 160 kbps: Saturday, Jun 28 (D25), and Sunday, Jun 29 (D65). * Behind has 11 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 23 (D14 at 720 kbsp), Tuesday, Jun 24 (D43 at 720 kbps), and Wednesday, Jun 25 (D63). The following passes will be carried out at 160 kbps: Tuesday, Jun 24 (D55), Thursday, Jun 26 (D65), Friday, Jun 27 (D55), and Saturday, Jun 28 (D55). The station 26 pass on Saturday, Jun 28, will be carried out at 240 kbps. Week 27 (Jun 30-Jul 6) * July 4 is the Independence Day holiday. * The 64th momentum dump on Behind will be carried out on Wednesday, Jul 2, with ignition at 20:00 UT. * Solar conjunction testing on the Ahead spacecraft will start Sunday, Jul 6. A detailed timeline will be sent out. On Sunday, the instruments will be powered off, and the SSR will be played back until empty. This will be followed by reconfiguring the SSR for solar conjunction. Near the end of the track, the HGA angle bias will be loaded for the next track. * Ahead has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 30 (D63 at 720 kbps), Tuesday, Jul 1 (D43 at 720 kbps), Thursday, Jul 3 (D14), Saturday, Jul 5 (D43 at 720 kbps, D43), and Sunday, Jul 6 (D63). The following passes will be carried out at 160 kbps: Wednesday, Jul 2 (D54), Friday, Jul 4 (D55), and Sunday, Jul 6 (D25). * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jun 30 (D14 at 720 kbps), Tuesday, Jul 1 (D63), Wednesday, Jul 2 (D14), Thursday, Jul 3 (D14 at 720 kbps), and Friday, Jul 4 (D14 at 720 kbps). The station 54 pass on Saturday, Jul 5, will be carried out at 160 kbps. The following station 26 passes will be carried out at 240 kbps: Saturday, Jul 5, and Sunday, Jul 6. Week 28 (Jul 7-13) * Behind has 8 passes during the week, and overall coverage is nominal. No 70 meter passes are scheduled during the week. * Behind will reach perihelion on Jul 9. System momentum will be high, and the SECCHI stepped calibration roll will be delayed by 1-2 weeks. * Solar conjunction testing will be continued on the Ahead spacecraft during the week. On Monday, Jul 7, the Ahead spacecraft will be on the first side lobe. The telemetry rates should be 10 kbps downlink, and 500 bps uplink. * The 69th momentum dump on Ahead will be conducted while the HGA is on the first side lobe. The momentum will be adjusted to a lower setting than usual, as will be done during solar conjuction. * After the momentum dump, the Ahead spacecraft will be commanded into a reset. It will then be at a data rate of 633 bps downlink, and 125 bps upload, and will come up on the HGA second side lobe. No more commands will be sent up to the spacecraft for the next three days to simulate the situation during conjunction. * On Wednesday, Jul 9, a time-tagged command will start the Ahead spacecraft rolling. It will then cycle through the antennas, starting with the -Z LGA. After 12 hours it will switch to the +Z LGA. The telemetry rate at this point will be 12 bps downlink, 28 bps uplink. * On Thursday, Jul 10, the Ahead spacecraft will autonomously reset after not having received any commands for 3 days. It will continue to rotate. * A time-tagged command will put the Ahead spacecraft back into three-axis stabilized mode prior to the second DSN support. This will be followed by a test of the 1 degree HGA off-point configuration. The telemetry rate on the 70 meter station will be 360 kbps downlink, and 2 kbps uplink. * Ahead spacecraft recovery will start immediately after the 1 degree HGA off-point test. The SSR will be played back, and then reconfigured back into operation mode. * Instrument recovery will start on Saturday, Jul 12, and continue through the weekend. There's a chance that instrument recovery could start as early as Friday, Jul 11, but the schedule is very tight. ESA passes have been added on Monday and Tuesday of the following week to assist with instrument recovery. Week 29 (Jul 14-20) * On Sunday, Jul 15, is the 29th SECCHI Step Calibration on Behind at 0435z for perihelion. * On Sunday, Jul 15, Station 63 is supporting the 20th HGA calibration on Behind at 1300z. * Ahead has 13 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Thursday, Jul 17 (D43 at 720 kbps), Friday, Jul 18 (D63), Saturday, Jul 19 (D43 at 720 kbps), and Sunday, Jul 20 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Tuesday, Jul 15 (D55), Wednesday, Jul 16 (D65), Thursday, Jul 17 (D55), Saturday, Jul 19 (D55 and D15), and Sunday, Jul 20 (D65). * Behind has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 14 (D63), Tuesday, Jul 15 (D63 at 720 kbps), Friday, Jul 18 (D63 at 720 kbps), and Saturday, Jul 19 (D14). The following passes will be carried out at 160 kbps: Wednesday, Jul 16 (D55), Thursday, Jul 17 (D45 and D54), Friday, Jul 18 (D45), Saturday, Jul 19 (D25) and Sunday, Jul 20 (D55). Week 30 (Jul 21-27) * On Thursday, Jul 24, project interface test with the new 34 meter station D35. * Ahead has 10 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Tuesday, Jul 22 (D63 at 720 kbps), Wednesday, Jul 23 (D14), Friday, Jul 25 (D14 at 720 kbps), Saturday, Jul 26 (D43), and Sunday, Jul 27 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Monday, Jul 21 (D54), Thursday, Jul 24 (D55), Saturday, Jul 26 (D54), and Sunday, Jul 27 (D55). * Behind has 12 passes during the week, and overall coverage is nominal. 70 meter passes are scheduled for Monday, Jul 21 (D43 at 720 kbps and D63), Tuesday, Jul 22 (D14 at 720 kbps), Wednesday, Jul 23 (D14 at 720 kbps), Friday, Jul 25 (D63), and Saturday, Jul 26 (D14 at 720 kbps). The following passes will be carried out at 160 kbps: Thursday, Jul 24 (D54), Friday, Jul 25 (D24), Saturday, Jul 26 (D55), and Sunday, Jul 27 (D54). Other * The station 45 maser is still red, lowering the sensitivity by 2 dB. COORDINATED OBSERVATIONS ------------------------------------------------------------------------------- Scheduled activities for Week 24: M Jun 09 (160) T Jun 10 (161) W Jun 11 (162) T Jun 12 (163) F Jun 13 (164) Ahead: HGA side-lobe test during station 63 pass S Jun 14 (165) S Jun 15 (166) ------------------------------------------------------------------------------- Scheduled activities for Week 25: M Jun 16 (167) T Jun 17 (168) W Jun 18 (169) T Jun 19 (170) F Jun 20 (171) S Jun 21 (172) S Jun 22 (173) ------------------------------------------------------------------------------- Scheduled activities for Week 26: M Jun 23 (174) T Jun 24 (175) W Jun 25 (176) T Jun 26 (177) Ahead: MOps Readiness for S/C Testing Review F Jun 27 (178) S Jun 28 (179) S Jun 29 (180) ------------------------------------------------------------------------------- Scheduled activities for Week 27: M Jun 30 (181) T Jul 01 (182) W Jul 02 (183) T Jul 03 (184) F Jul 04 (185) Independence Day S Jul 05 (186) S Jul 06 (187) Ahead: Turn instruments off Notes: * Solar conjunction operations test on Ahead, Jul 6-12. All science instruments will be off during this test. ------------------------------------------------------------------------------- Scheduled activities for Week 28: M Jul 07 (188) Ahead: Momentum dump using side lobe, command s/c reset T Jul 08 (189) W Jul 09 (190) Ahead: Start spacecraft rotation via time-tagged command Behind: Perihelion T Jul 10 (191) Ahead: Autonomous reset, recover spacecraft back to HGA F Jul 11 (192) S Jul 12 (193) Ahead: Power on instruments S Jul 13 (194) Ahead: Continue instrument recovery Notes: * Solar conjunction operations test on Ahead, Jul 6-12. All science instruments will be off during this test. Instrument power on may start as soon as Friday, Jul 11. ------------------------------------------------------------------------------- Scheduled activities for Week 29: M Jul 14 (195) T Jul 15 (196) 29th SECCHI Step Calibration on Behind at 0435z: Perihelion. Station 63 is supporting the 20th HGA calibration on Behind at 1300z W Jul 16 (197) T Jul 17 (198) F Jul 18 (199) S Jul 19 (200) S Jul 20 (201) ------------------------------------------------------------------------------- Scheduled activities for Week 30: M Jul 21 (202) T Jul 22 (203) W Jul 23 (204) T Jul 24 (205) Project interface test with the new 34 meter station D35 F Jul 25 (206) S Jul 26 (207) S Jul 27 (208) ------------------------------------------------------------------------------- Upcoming events: 2014: * Jul 23 Both: HGA calibration * Aug 5 Ahead: HGA on main lobe, offpoint 1 degree * Aug 14 Ahead: Solar Conjunction Readiness Review * Aug 20 Ahead: Start of solar conjunction operations * Aug 22 Ahead: Rehearse with DSN * Aug 23 Ahead: HGA on 1st side lobe * Sep 07-Nov 15 Behind: Passage of Comet Siding Spring through HI2-B * Sep 18 Behind: MOps Readiness for S/C Testing Review * Sep 29-Oct 6 Behind: Test of solar conjunction operations * Sep 21 MAVEN arrival at Mars * Oct 17 Behind: Comet Siding Spring encounter with Mars * Oct 23 Behind: Solar Conjunction Readiness Review * Nov 10 Ahead: HGA on 2nd side lobe * Nov 14 Behind: Start of solar conjunction operations * Nov 16 Behind: Rehearse with DSN * Dec 1 Behind: HGA on 1st side lobe 2015: * Jan 3 Behind: HGA on 2nd side lobe * Jan 22 - Mar 23 Behind: Spacecraft behind Sun * Mar DAWN - Ceres arrival * Mar 24 - Jul 07 Ahead: Spacecraft behind Sun * Jul DAWN - End of nominal mission * Aug 25 - Oct 19 Behind: Possible interference from Sun * Sep 24 Ahead: HGA on 1st side lobe * Nov 23 Behind: HGA on 1st side lobe * Dec 28 Ahead: Spacecraft recovery * Dec 29 Ahead: HGA on main lobe, offpoint 1 degree * Dec 31 Ahead: Instrument turn-on 2016: * Jan 12 Behind: HGA on main lobe * Jan 18 Behind: Instrument turn-on * Feb 19 Ahead: HGA on main lobe * Mar 16 Both: Post Solar Conjunction Assessment Review * Jul 5 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