Astronomers have observed a small object orbiting Earth, which they have dubbed a “mini-moon” or the planet’s “second moon”.
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Dubbed 2020 CD3, the mini-moon was discovered by Kacper Wierzchos and Teddy Pruyne of the NASA-funded Catalina Sky Survey (CSS) in Arizona on the night of February 15.
It is actually an asteroid, about the size of a car; its diameter is about 1.9-3.5 m.
Orbit integrations indicate that this object is temporarily bound to the Earth. i.e. unlike our permanent Moon, the mini-moon is temporary; it will eventually break free of Earth’s orbit and go off on its own way.
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