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Space craft
Major contractorsJohns Hopkins University Applied Physics Laboratory
Mission TypeOrbiter
Satellite ofSun
Launch date2006-10-26, 00:52:00 UTC
Carrier rocketDelta II 7925-10L
Launch siteSpace Launch Complex 17-B
Cape Canaveral Air Force Station
Mission duration>3 years
Mass620 kg
Power475.0 W
Orbital elements
Orbital periodSTEREO A: 346 days
STEREO B: 388 days
Main instrumentsSun Earth Connection Coronal and Heliospheric Investigation (SECCHI): * Extreme UltraViolet Imager (EUVI) * Inner Coronagraph (COR1) * Outer Coronagraph (COR2) * Heliospheric Imager (HI) * Sungrazing Comets

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STEREO (Solar TErrestrial RElations Observatory) is a solar observation mission. Two nearly identical spacecraft were launched into orbits that cause them to respectively pull farther ahead of and fall gradually behind the Earth. This will enable stereoscopic imaging of the Sun and solar phenomena, such as coronal mass ejections.

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