1981 YO. Discovered 1981 Dec. 20 by A. Mrkos at Kleť.

Named in honor of the New Zealand mountaineer Sir Edmund Percival Hillary (1919– ), who, with Sherpa Tenzing Norgay {see planet (6481)}, was the first to conquer Mt. Everest. The discoverer worked with Hillary in Antarctica during the International Geophysical Year, 1957–1958. (M 23135)