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This may not be complete or up to date, but sorting the List of minor planets with moons for smallest primary shows 2015 TD144 as having a 0.1 km diameter primary and 0.1 km diameter secondary. That Wikipedia article links to Asteroids with Satellites by Wm. Robert Johnston last updated 7 November 2021 which lists 2015 TD144 having an effective diameter of 0....


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