Angie Kelly

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Report from the Mission Operations Working Group
(MOWG) Meeting October 28, 2008
EOS Aura Science Team Meeting

• Angie Kelly
• EOS Science Interface Manager
• Constellation Team Manager
• NASA Goddard Space Flight Center
• Greenbelt, Md. 20771

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AGENDA EOS AURA Mission Operations Working Group
Meeting
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MOWG Meeting Attendees Columbia, Maryland October
2008
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Topics

• Major Activities Events Since Oct 2007
• Aura Relocation
• Spacecraft Subsystems Summary
• Anomalies
• Planned Activities
• Propellant Usage Lifetime Estimates
• Overall Summary
• Additional Information

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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)

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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
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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
  Aquacompleted on May 8, 2008
• Aura is now on a different ground track than Aqua
  (18 kilometer (East) offset of Aquas 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
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Aura Rephasing (2 of 2)
Aura MLS now sees the same air mass as CloudSat
and CALIPSO
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Spacecraft Subsystems Status
All subsystems are configured to primary
hardware.
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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

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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

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Aqua/Aura Inclination Adjust Maneuvers (DRAFT
Schedule for March May 2009)

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Maneuver Locations
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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
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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

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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)

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Thank you!Questions?
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Additional Charts-
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Auras Neighborhood(705 km Orbit)
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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
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Orbital Debris Avoidance
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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 DODs Joint Space
  Operations Center (JSpOC) to screen all A-Train
  and Morning Constellation missions to ensure
  their safety.

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Debris Avoidance Maneuvers During 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

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Spacecraft Anomalies

• Command Data Handling (CDH) 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 CDH Swap Procedures if necessary
• No impact to operations or 6-year life expectancy

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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 Aquas 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
  Aquas 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

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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 spacecrafts mission
• The operational orbit parameters
• The mission launch date
• Length of a missions 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

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Aura DAS Lifetime Estimate(September 2008)
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Schatten DAS 2.0.1 Solar Flux Predictions
Nominal Timing
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Data Capture
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Data Capture
SSR Data Capture to 09/30/2008 99.9910
SSR Anomaly
EDOS Ops Error
Norway Comm Outages