An Asteroid With Its Own Moon Will Zip Past Earth Tonight Asteroids Tonight

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April 12, 2020

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An animation shows what the orbit looks like.

(Image: © Dr. Steven Ostro et al./NASA)

A very big asteroid with its own little moon is going to zip past Earth tonight (May 25) — close enough that, with some preparation and a decent telescope, amateur astronomers may spot it blotting out the stars.

This moon-and-asteroid system, called 1999 KW4, is made up of two rocks. The big one is about 0.8 miles (1.3 kilometers) wide, according to .