3753 Cruithne (/kruːˈiːnjə/ or /ˈkrʊnjə/) is an Aten asteroid in orbit around the Sun in 1:1 orbital resonance with Earth making it a co-orbital object. It is a minor planet in solar orbit that relative to Earth orbits in a bean-shaped orbit that ultimately effectively describes a horseshoe and which can transition into a quasi-satellite orbit. It has been incorrectly called Earth’s second moon. Cruithne does not orbit Earth and at times it is on the other side of the Sun.
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