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Presented by Patrick Coronado

(Information provided by NASA/GSFC: Angie Kelly, Bill Guit, and Eric Moyer)

Earth Observing System (EOS)Mission Status NOAA Direct

Broadcast Conference April 6, 2011

Aqua

Aura

Terra

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Terra:• Launch Date: December 18,1999 (Atlas IIAS, VAFB)• Orbit: 705 km, sun-synchronous polar, 98.2o Inclination, 10:30 AM MLT descending node• Instrument Payload: ASTER (SWIR, TIR & VNIR) (Japan); CERES (Fore & Aft) (USA – NASA LaRC);

MISR (USA –NASA JPL); MODIS (USA – NASA GSFC); MOPITT (Canada)

Aqua:• Launch Date: May 4, 2002 (Delta, VAFB)• Orbit: 705 km, sun-synchronous polar, 98.2o Inclination, 1:30 PM MLT ascending node• Instrument Payload: AMSR-E (Japan); AMSU (USA –NASA JPL); AIRS (USA –NASA JPL);

CERES(USA – NASA LaRC); HSB (Brazil); MODIS (USA – NASA GSFC)

Aura:• Launch Date: July 15, 2004 (Delta, VAFB)• Orbit: 705 km, sun-synchronous polar, 98.2o Inclination, 1:45 PM MLT ascending node• Instrument Payload: HIRDLS (UK/NASA/UCAR); MLS ((USA –NASA JPL); OMI (KNMI, Netherlands);

TES (USA –NASA JPL)

EOS Project Management: Earth Science Mission Operations (ESMO), NASA GSFC• Mission Operations: NASA GSFC• Instrument Operations and Science Data processing: Performed at respective Instrument Locations• Science Data Processing: Level zero: EOS Data Operations System (EDOS); Level 1+: Various Data

Centers and Investigator-led Processing Facilities in the US and International Partner Facilities

EOS Terra, Aqua, and Aura Missions

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Terra Summary

• Spacecraft Status - GREEN• Instrument Status - GREEN

– ASTER: VNIR and SWIR nominal; SWIR ops ended 2008– CERES: Operating Normally – MISR: Operating Normally – MODIS: Operating Normally– MOPITT: Operating Normally

• Data Capture/L0 Processing Status – GREEN– SSR Data Capture over life of the mission: ~99.00 %

• Ground Systems – System Upgrades in progress– Implementing system changes and new back-up control center– No planned interruptions to operations– Completion in Summer 2011

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2000 2004 2008 2012 2016 20200

50

100

150

200

250

300

350Definitive Predictive Required Reserve Unusable Fuel

Fuel

Rem

aini

ng (k

g)

10/19/2017Remaining

Fuel = 45.2 kg

Required Fuel Reserved to safely exit constella-tion = 42 kg

Unusable Fuel = 5 kg

• Terra has sufficient propellant to maintain Mean Local Time (MLT) of 10:30am +/- 1 minute through 2017

• Terra can continue to operate through Summer of 2019 by allowing MLT to drift towards minimum MLT requirement of 10:15 am (established prior to launch)

TerraPredicted Propellant Usage based on Nominal Solar Flux

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Aqua Mission Summary

• Spacecraft Status - GREEN• Instrument Status - GREEN

– AMSR-E, AIRS, AMSU, CERES & MODIS: » Operations Nominal – Producing Great Science

– HSB: Survival Mode since 2/5/2003• Data Capture/L0 Processing Status – GREEN

– SSR Data Capture to over life of the mission: ~ 99.97 %• Data Latency – Excellent • Ground Systems – System Upgrades in progress

– Implementing system changes and new back-up control center

– No planned interruptions to operations– Completion in Summer 2011

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Aqua Fuel Usage: Actual & Predicted

Fall 2006 Delta-i Maneuvers

Fall 2004 Delta-i Maneuvers

Spring 2007 Delta-i Maneuvers Spring 2010

Delta-i Maneuvers (3)

Annual Delta-i Maneuvers

Spring 2018 Delta-i Maneuvers

Ascent Maneuvers

Spring 2009 Delta-i Maneuvers (9)

Aqua spacecraft has sufficient fuel to maintain its current orbit within the Afternoon Constellation through FY2018 and possibly well beyond

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Aura Summary

• Spacecraft Status - GREEN• Instrument Status - GREEN

– HIRDLS: Not collecting science data – Chopper Stalled 03/17/08 – MLS: Operating Normally

» Periodic Band 13 measurements » THz module currently in standby mode

– OMI: Operating Normally » Field-of-View Anomaly started in September 2007 – currently stable

– TES: Operating Normally• Data Capture/L0 Processing Status – GREEN

– SSR Data Capture over life of the mission: ~99.99 %

• Ground Systems – System Upgrades in progress– Implementing system changes and new back-up control center– No planned interruptions to operations– Completion in Summer 2011

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Aura Fuel Usage: Actual & Predicted

Spring 2010 Inclination Adjust Maneuvers (3)

Spring 2018 Inclination Adjust Maneuvers

Ascent Maneuvers Spring 2009

Inclination Adjust Maneuvers (9)

Aura spacecraft has sufficient fuel to maintain its current orbit within the Afternoon Constellation through FY2018 and possibly well beyond

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Additional Information

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Date Incident Cause Response/Impact

6/15/2001 MODIS Power Supply 2 failed

Suspect a High Energy Particle was the cause of the thermal runaway condition damaging the Field Effect Transistors (FET)

Switched to Redundant Power Supply. Redundant Power Supply has been nominal.

9/10/2002 MODIS Formatter Side A Timing Errors corrupting Science (Degraded Performance)

Formatter A has had a history of problems which resulted in processing errors. The likely cause of the Formatter Timing Errors is an incorrectly terminated clock signal. Fixed on Aqua.

9/10/02 MODIS Science data was affected. MODIS Formatter Swap to Side B was performed on 9/17/02. Since the switch, no Formatter Errors have been detected and the data quality is excellent.

5/29/2008 Direct Access System Modulator prevented X-Band

Electrical Power Conditioner (EPC) Side failed. Cause Unknown

Switched to redundant side to restore X-Band capability. X-Band has been nominal since recovery.

10/13/2009 Hex Bay Battery Assembly (BBAT) heater control failed on 4 of 9 heater groups and Cell #50 of 54 failed

Suspect impact from Micro-Meteoriod or Orbital Debris (MMOD)

Science is unaffected by anomaly. Modified battery management to account for loss of one cell, increased charge/discharge ratio and increased remaining five heater group temperature setpoints to keep cell temperatures above freezing.

Note: Power Module Battery continues to operate nominally.

Terra Anomaly* History

* --Significant anomalies

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Aqua Spacecraft Subsystems

• Command & Data Handling (CDH) – Nominal– Solid State Recorder (SSR) – only holds 2 orbits of data– SSR Anomaly (12/02/07) – fully recovered 01/28/09

• Communications (COMM) – Nominal• Electrical Power System (EPS) – Nominal

– Battery Cell Anomaly (09/02/05)– Solar Panel #8 Thermistor #6 Failure (08/03/09)– Solar Array Offset (Reported 11/17/09, Corrected 06/29/10)

• Flight Software (FSW) – Nominal• Guidance, Navigation & Control (GN&C) – Nominal• Propulsion (PROP) – Nominal

– Dual Thruster Module (DTM-2) Heater Anomaly (09/08/07)• Thermal Control System (TCS) – Nominal

All subsystems still configured to primary hardware

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Aura Spacecraft Subsystems

• Command & Data Handling (CDH) – Nominal– Solid State Recorder (SSR) Anomaly (December 4-18, 2007)

» Returned Nov 2010 – Jan 2011 at reduced level – then subsided • Communications (COMM) – Nominal• Electrical Power System (EPS) – Nominal

– Solar Panel Connector Anomaly (January 12, 2005)– Solar Array Offset (Reported 11/17/09, Corrected 06/29/10)– Array Regulator Electronics 5A Anomaly (March 11, 2010)

» Simultaneously with GN&C Attitude Disturbance • Flight Software (FSW) – Nominal• Guidance, Navigation & Control (GN&C) – Nominal

– Earth Sensor Assembly (ESA) Anomaly (May 29, 2009)» Recovered by re-calibration in Fall 2009

• Propulsion (PROP) – Nominal– Dual Thruster Module (DTM-3) Anomaly (Aug 16, 2005)

• Thermal Control System (TCS) – Nominal

All subsystems configured to primary hardware