(3753) Cruithne

(3753) Cruithne - is an asteroid in orbit around the Sun. It is sometimes described as Earth's "second moon", though this is technically incorrect: its orbit has unusual properties when viewed in relation to the orbit of the Earth, but it is not a satellite of the Earth.

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  Cruithne
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  Horseshoe orbit of Cruithne from the perspective of Earth
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  Orbits of Cruithne and Earth
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  Cruithnes distance to Earth and Sun