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Also called Windsat and P98-2


Designation 27640 / 03001A
Launch date 6 Jan 2003
Country of origin United States
Perigee/Apogee 833 km sun-synchronous
Inclination 98.7°
Launch vehicle Titan 2 #24

For the USAF and NRL. Cost: $223.5 million.

Will measure wind speed and direction above the seas. Will also monitor solar activity (takes solar eruption photos).

External resources

sat-index articles



Technical data


Prime contractor Spectrum Astro
Platform SA-200HP
Mass at launch 827 kg
Dry mass 745 kg
Dimension 4.69 m height x 1.34 m diameter (7 m height in orbit)
Solar array provides 1174 W at EOL
Stabilization 3-axis
DC power  
Design lifetime 3 years

Has a 30 Gbit solid state recorder. Active swath 1025 km

Command and telemetry in S-band, data downlink in X-band (upto 51.2 Mbps). In S-band, the US Navy will download radiometer data in realtime.


Windsat, a yaw-spinning polarimetric microwave radiometer experiment to passively measure the ocean surface wind vector.
Solar Mass Ejection Imager (SMEI), build by the USAF reseach lab. It will monitor solar activty with the goal of more accurately predicting geomagnetic disturvances to orbiting satellites.

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