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Wilson–Harrington, also known as asteroid 4015, is a small asteroid that orbits the Sun in the main asteroid belt. It was discovered in 1979 by astronomers Eleanor Helin and Schelte Bus at the Siding Spring Observatory in Australia. Wilson–Harrington is classified as a stony S-type asteroid and has a diameter of approximately 5 kilometers. It completes one orbit around the Sun every 4.5 years.