News of the WeekPlanetary Science

Twins for the Themis Asteroid Family

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Science  22 Sep 2000:
Vol. 289, Issue 5487, pp. 2023
DOI: 10.1126/science.289.5487.2023b

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A high-tech telescopic search has revealed that the asteroid Antiope is actually two bodies of similar size circling each other. It's not the first asteroid found to be a pair, but the uniquely twinned Antiope presents a severe problem: How could the continual banging about among asteroids create bodies of similar size in orbit about each other?