First Earth Trojan Asteroid Discovered
by Erin Podolak | 4:38 pm, July 27th
The first asteroid that shares an orbit with Earth has been discovered. The asteroid is called 2010 TK7, and is part of a class of objects called Earth Trojans that until now were only theoretical. Discovered by NASA’s Wide-field Infrared Survey Explorer (WISE) the asteroid is approximately 300 meters across. The asteroid is about 80 million km from Earth, and due to its position in the sky, is only within a visible range during the day when it can’t be seen.
WISE orbits the Earth so the images it takes are always against a dark background, which makes the light of day or night irrelevant for viewing purposes. WISE also has the ability to see in infrared, which makes warm objects (like the asteroid) easier to see.
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