Trojan

Earth has a Trojan...asteroid that is. Trojans are asteroids that reside in the Lagrangian points of a planet's gravitational field. A Lagrange point is a point around a planet where the gravitational pull of the planet and the Sun allow an object to stay in a fixed position; a bit like geosynchronous orbit. There are six Lagrange points around a planet, L1-L6, and Earth's Trojan is located at the Lagrange point forward of her orbit known as the L4. I was very excited when I found this because I studied Trojans over a year ago and have been wondering ever since whether Earth had any. If you notice the illustration (on the link below) of the object's orbit it is obvious why it was difficult to spot the 1,000' wide object 50 million miles away...

www.space.com/earth asteroid discovered