MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Binary asteroid 90 Antiope, artwork. This asteroid orbits in the main part of the outer asteroid belt. It was discovered on 1st October 1866 by the German astronomer Karl Luther. Each of the two asteroids is 86 kilometres across, they are separated by 170 kilometres (centre to centre) and orbit each other with a period of 16.5 hours.
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