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Also called Aqua


Designation 27424 / 02022A
Launch date 4 May 2002
Country of origin United States
Mission Remote sensing
Perigee/Apogee 685 km (sunsynchronous)
Inclination 98.2°
Period 99 min (cycle of 16 days)
Launch vehicle Delta 2 #291

Contracted together with EOS Chemistry 1 for $398 million; an option on two more crafts could amount the total to $668 million. Is non-compliant to the NASA safety standard for re-entry.

In Jul 2002, a software glitch cause the satellite to go in safe mode.

Has instruments to monitor rainfall, snow, sea ice, soil moisture and clouds.

Part of a group of satellite (the "A-train") which observe the same phenomena within minutes (15 max). The other satellites are: Parasol, EOS PM 1, EOS Chemistry 1, Picasso-Cena / Calipso, Cloudsat, and OCO.

External resources


sat-index articles

Technical data


Prime contractor TRW
Platform AM1200 EOS commun spacecraft bus
Mass at launch 2934 kg
Mass in orbit  
Fuel mass 102 kg
Dimension 2.7 x 2.5 x 6.5 m
Solar array  
Stabilization 3-axis
DC power EOL: 4800 W
Design lifetime 6 years

Acquisition via TDRS
Telemetry: 2287.5 MHz
Command: 2106.4 MHz
Data: 15003.4 MHz (upto 150 Mbps)

AMSR-E (Advanced Microwave Scanning Radiometer)

Built by NASDA, it will mainly collect data related to water (rainfall volume, water vapro volume, sea surface temperature, ocean winds, snow depth, soil moisture content and distribution of sea ice). 324 kg, 12 channels. Also found on Adeos 2.

In november 2004, one channel of the instrument failed. Service ended in Dec 2015.

CERES (Clouds and the Earths Radiant Energy System)

CERES measures Earth's radiation budget and atmospheric radiation from the top of the atmosphere using a broadband scanning radiometer with bolometers detectors.

MODIS (Moderate-Resolution Imaging Spectroradiometer)

MODIS measures biological and physical processes on land and the ocean using a cross-track scanning multi-spectral radiometer with 36 spectral bands from visible to thermal infrared (0.4-14 µm). Detector cooling is through a passive radiant cooler, and filters are interference type. 229 kg

AMSU (Advanced Microwave Sounding Unit)

Monitors atmospheric temperature and humidity in 15 bands covering the 50-89 GHz range. 100 kg. Also found on the NOAA Poes satellites

AIRS (Atmospheric Infrared Sounder)

Measures global temperatures, cloud properties and radiated flux in 2,300 spectral bands covering wavelengths in the 0.4-1.7 and 3.4-15.4 micron ranges. 156 kg NASA/JPL
The instrument proved very efficient. Its results were inputed in the weather forcasting process and improved the overall results (6 to 8 hours improvments).

HSB (Humidity Sounder from Brazil)

Built by INPE, 66 kg instrument that measures atmospheric humidity in four frequency channels at a horizontal spatial resolution of 13.5 km.

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