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It's not a moon because it doesn't orbit a planet, it directly orbits the Sun. It's basically an asteroid which is orbiting the Sun in an eccentric orbit that occasionally takes it near Earth. Cruithne's orbital period is slightly less than that of Earth, so on average the Earth is currently "following" Cruithne around the Sun, with Cruithne pulling slightly ahead each year.By about 80 years from now, it will be so far ahead that it's on pretty much the opposite side of the Sun from us, and then will be "following" Earth in its orbit, slowly catching up to us until about 2300 AD, when the Earth's gravity will push Cruithne into a slightly more distant orbit so that its orbital period becomes slightly MORE than a year, at which point it will start falling behind more and more each year until Earth catches up to it again in another 380 years and shoves it a little CLOSER to the Sun, speeding it up again and starting the whole chase over.

From Earth's point of view, Cruithne appears to be "orbiting" a point in empty space in a sort of bean-shaped orbit. This isn't really the case (Cruithne is orbiting the Sun in an elliptical orbit, just like we are), it's just how Cruithne's path appears from Earth.

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