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, is not alone. The chunk of gray space rock has its own tiny little asteroid moon, wrapped in a close orbit – too close to be discerned from a large distance.
Asteroids do tend to hang out together – there's the main belt, of course, and the swarms of Trojan asteroids that share the orbit of Jupiter – but how often they come into close enough proximity to each other to become gravitationally bound is unclear. The larger rock, preliminary measurements suggest, is about 790 meters at its widest point, while the smaller is a relatively titchy 220 meters .
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