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Report from the Mission Operations Working Group (MOWG) Meeting October 28, 2008

EOS Aura Science Team Meeting. Report from the Mission Operations Working Group (MOWG) Meeting October 28, 2008. Angie Kelly EOS Science Interface Manager Constellation Team Manager NASA Goddard Space Flight Center Greenbelt, Md. 20771. AGENDA

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Report from the Mission Operations Working Group (MOWG) Meeting October 28, 2008

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  1. EOS Aura Science Team Meeting Report from the Mission Operations Working Group (MOWG) MeetingOctober 28, 2008 Angie Kelly EOS Science Interface Manager Constellation Team Manager NASA Goddard Space Flight Center Greenbelt, Md. 20771

  2. AGENDA EOS AURA Mission Operations Working Group Meeting

  3. MOWG Meeting Attendees Columbia, Maryland October 2008 GSFC

  4. Topics • Major Activities & Events Since Oct 2007 • Aura Relocation • Spacecraft Subsystems Summary • Anomalies • Planned Activities • Propellant Usage & Lifetime Estimates • Overall Summary • Additional Information Aura Mission Operations Status

  5. Major Activities/Events(Since last Science Team Meeting on 10/02/07) • Aura Relocation- completed May 2008 • 06/26/08: Debris Avoidance Maneuver • 07/15/08: 4-Year Anniversary • 08/15/08: HQ Mission Status Review • Continuing Upgrade of the Ground System • Replacement and upgrade of hardware and software in the Mission Operations Center due to aging hardware/software and new security requirements • EOS Data Capture and Level Zero Processing (EDOS) Upgrade: enhanced capability to support future missions, e.g., data capture up to 500 Mbps (Dec 2008) Aura Mission Operations Status

  6. CALIPSO CloudSat Aura Relocation In the Afternoon Constellation(A-Train) • There are currently 5 satellites in the “A-Train”: Aqua, CloudSat, CALIPSO, PARASOL, and Aura. • OCO and Glory missions will launch in January and June 2009, respectively As of October 22, 2008 GSFC

  7. Aura Rephasing (1 of 2) • At the request of the Aura Project Scientist, Aura was moved from its current location (15 minutes behind Aqua) to ~ 8 minutes behind Aqua—completed on May 8, 2008 • Aura is now on a different ground track than Aqua (+18 kilometer (East) offset of Aqua’s WRS-2 path) to enable MLS/CloudSat viewing goal • Aura FOT is maintaining the Control Box to ±10 km (±20 km requirement) A-Train Control Box Configuration GSFC

  8. Ground track (WRS Paths) Aqua CloudSat CALIPSO 8 min CloudSat ground track 7 min PARASOL N ~7 min 10 sec Aura Equator MLS Limb track MLS AIRS +/- 825 km MODIS +/- 1150 km OMI +/- 1300 km Orbit Plane MLTAN – 13:35 13:44 Aura Rephasing (2 of 2) Aura MLS now sees the same air mass as CloudSat and CALIPSO GSFC

  9. Spacecraft Subsystems Status All subsystems are configured to primary hardware. Aura Mission Operations Status

  10. Anomalies Since October 2007 • 12/4/07: Solid State Recorder Anomaly -- Intensive investigation and contingency planning (Jan- March 2008) • 03/17/08: HIRDLS Chopper Shutdown • Ongoing recovery activities • 05/11/08: OMI Row Anomaly #2 • 05/29/08: MLS THz Module SIF5 Electronics Anomaly • 06/01 – 06/04/08: MLS Filter Band 07 Anomaly • 06/09 – 6/12/08: TES to Safe Mode – ICS Only • 10/01/08: JPL reported rapid decline in MLS Band 32 Channels 3 & 4 • 10/13/08: JPL reported Band 32 Channels 3 & 4 have recovered to 96% of their original values and are acceptable for normal science data processing Aura Mission Operations Status

  11. Planned Activities • 12/11/08: Drag Make Up Maneuver #16 • 2009 Inclination Adjust Maneuvers (IAMs) • 9-burn sequence over 8-weeks • March 11th, 17th & 19th • April 1st, 7th , 9th , 22nd , 28th & 30th • May 5th , 6th & 7th (Back-Up Dates) • -0.0957 degree delta-I; 12.794 m/s delta-V • 21.0 Kg • Dec 31, 2008: Leap Second • 2009 Senior Review (Mission Ops Input) • How long can the mission last? • OCO (1/15/09) and Glory(6/15/09) Launches Aura Mission Operations Status

  12. Aqua/Aura Inclination Adjust Maneuvers (DRAFT Schedule for March – May 2009) Aura Mission Operations Status

  13. Maneuver Locations Aura Mission Operations Status

  14. Aura Fuel Usage: (Actual & Predicted) Fall 2004 Delta-i Maneuvers Annual Delta-i Maneuvers Fall 2006 Delta-i Maneuvers Spring 2009 Delta-i Maneuvers Spring 2007 Delta-i Maneuvers Aura Mission Operations Status

  15. MOWG Focus GOAL: Continued operation of the spacecraft and instruments as they age Understanding the current state of the instruments regarding any changes that may affect performance or data products How to adjust operations in order to prolong instrument life and science mission Understanding what are the various conditions that can cause an instrument to go to an “undesirable” state and implementing procedures to avoid them Mutual understanding/detailed procedures between the FOT and IOT on how to deal with critical situations, i.e., red flags Projected lifetime of the instrument based on current state

  16. Summary • Spacecraft Status - GREEN • Instrument Status - GREEN • HIRDLS: Reduced Aperture; chopper recovery in progress • Chopper began exhibiting anomalous behavior in November 2006 • Chopper Stalled March 17, 2008 (unable to re-start to date) • 9/10/08: Initiated auto re-start Macro ~ 288 restart attempts/day • MLS: Operating Normally • Band 13 measurements suspended February 2006 • THz Band 17 currently out of lock • OMI: Operating Normally • Two (2) Field-of-View Row Anomalies (September 2007 & May 2008) • TES: Operating Normally • August 2008: Modified Global Survey Observations to extend ICS lifetime • Implemented new Lubrication Macro to extend ICS lifetime • Data Capture/L0 Processing Status – GREEN • SSR Data Capture to 09/30/2008: 99.9910 %* • Ground Systems • Continuing ground system upgrade and technology refresh • Preparing for Senior Review in 2009 (First time) Aura Mission Operations Status

  17. Thank you!Questions? GSFC

  18. Additional Charts- Aura Mission Operations Status

  19. Aura’s Neighborhood(705 km Orbit) GSFC

  20. Earth Science Morning Constellation • SAC-C is staying 2 km above Landsat-7 & Terra • EO-1 is currently 15 km below Landsat-7 & Terra • Operating on a 2-year extension through 2009 • Has enough propellant to last through 2011 • • Terra and LandSat-7 are continuinng operations at 705 km. Original Morning Constellation configuration As of October 22, 2008 GSFC

  21. Orbital Debris Avoidance GSFC

  22. Debris Avoidance • A number of missions are in a 705 km sun-synchronous polar orbit. • 55 other objects reside in orbits with mean altitudes of 705 +/- 5 km, including, A-Train missions, Terra, EO-1, Landsat-5 and -7, and six Iridium satellites. • More than 1500 cataloged objects pass through this regime each day. • On average, one object comes close • Within 5 km of each constellation mission each day • Within 2 km of each constellation mission once or twice a week. • ESMO has a task with the DOD’s Joint Space Operations Center (JSpOC) to screen all A-Train and Morning Constellation missions to ensure their safety.

  23. Debris Avoidance ManeuversDuring June 2007 – July 2008 • Aura performed a 2-second burn on June 26, 2008 to avoid a piece of well-tracked debris from a U.S. satellite. • CloudSat performed two small maneuvers on July 20 and 22, 2008 to avoid debris from a Delta I LV. • PARASOL performed an early drag make-up maneuver on October 20, 2008 to avoid a space object. • PARASOL is planning a possible avoidance maneuver on October 27 • Terra is evaluating a debris avoidance maneuver this week

  24. Spacecraft Anomalies • Command & Data Handling (C&DH) Subsystem Formatter Multiplexer Unit/Solid State Recorder (FMU/SSR) Anomaly • Started December 4, 2007: • Entered “quiet period” two-weeks later (12/18/07) • Occasional packet errors are still observed at pre-anomaly levels • No interruption to spacecraft or instrument operations • ESMO Anomaly Resolution Team Formed • NGST, AETD, FOT, MD • GSFC/AETD/NGST Anomaly Review Board Final Report • Most Likely Cause: Single Event Functional Interrupt (SEFI) • Continue to operate as is unless anomaly returns • FOT prepared to perform FMU/SSR Reset Procedures and/or C&DH Swap Procedures if necessary • No impact to operations or 6-year life expectancy Aura Mission Operations Status

  25. Updated Lifetime Estimate(September 2008) • Long-term orbit simulations were run for Aqua and Aura through 2017 • Used mean nominal Schatten solar flux predictions • Estimated the frequency of drag make-up maneuvers to maintain Aqua’s WRS-2 ground track requirements • Estimated the required number of annual inclination maneuvers for Aqua and Aura to satisfy the OMI beta angle request and maintain Aqua’s mean local time (MLT) requirement • Did not include potential debris avoidance maneuvers • Lifetime predictions for Aqua and Aura show that both spacecraft will have sufficient fuel to maintain their current orbits within the Afternoon Constellation through 2016 and possibly well beyond • Further analyses will be performed by ESMO FD Team Aura Mission Operations Status

  26. Debris Assessment Software • The Debris Assessment Software (DAS) was created by the Orbital Debris Office in Johnson Space Center and is the Agency standard for end of mission life analyses and lifetime estimations • DAS requires several inputs from a user describing a spacecraft’s mission: • The operational orbit parameters • The mission launch date • Length of a mission’s lifetime • In turn, DAS outputs: • Whether this mission is compliant with NASA requirements for limiting orbital debris • A recommended apogee and perigee that will allow the spacecraft to reenter within a specific period and satisfy NASA requirements • Aqua and Aura will have enough fuel onboard to safely exit the constellation and deorbit to the DAS recommended apogees and perigees Aura Mission Operations Status

  27. Aura DAS Lifetime Estimate(September 2008) Aura Mission Operations Status

  28. Schatten & DAS 2.0.1Solar Flux Predictions – Nominal Timing Aura Mission Operations Status

  29. Data Capture

  30. Data Capture • SSR Data Capture to 09/30/2008: 99.9910 %* SSR Anomaly EDOS Ops Error Norway Comm Outages Aura Mission Operations Status

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