Earth has a little buddy asteroid follower!


Astronomers studying observations taken by NASA’s Wide-field Infrared Survey Explorer (WISE) mission have discovered the first known “Trojan” asteroid orbiting the sun along with Earth.
Trojans are asteroids that share an orbit with a planet near stable points in front of or behind the planet.

2010 TK7@wiki:

2010 TK7 is the first Trojan asteroid discovered sharing the Earth’s orbit in the Earth-Moon system around the sun. Trojan satellites are theoretically predicted objects which orbit 60° ahead of or behind a planet in its orbit, and which had previously only been observed in the orbits of Mars, Jupiter and Neptune.

2010 TK7 has a diameter of about 300 metres (1,000 ft). Its path oscillates around the Sun-Earth L4, shuttling between this and the L3 Lagrangian point with a period of about 400 years.


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