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2017 SN16, is a sub-kilometer asteroid, classified as a near-Earth object of the Apollo group, approximately 90 meters (300 feet) in diameter. The object was first observed on 24 September 2017, by cometary discoverer Alex Gibbs with the Mount Lemmon Survey at Mount Lemmon Observatory, Arizona, in the United States. It forms an asteroid pair with 2018 RY7 and is currently trapped in a 3:5 mean motion resonance with Venus.