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That picture is a little confusing. The OP says the asteroid's "moon" is 2,000 feet in diamater, or 0.38 miles. The asteroid is 1.7 miles wide. The "moon" should be about 1/4 to 1/5 the diameter of the main asteroid, but it looks like a blip in the pictures. I think the term also floated in that article "binary asteroid" is more apropos if the size reported is correct.
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