51P/Harrington

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Updated on April 16, 2023

Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2029 Nov. 15 51P 2022 Oct. 1 51P 2015 Aug. 12 51P 2008 June 18 51P 2001 June 5 51P 1994 Aug. 23 51P 1987 Oct. 31 51P 1980 Dec. 24 1974 Feb. 17 1967 Apr. 23 51P/1960 P1 1960 June 28 51P/1953 P1 1953 Sept.22

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996. The perihelion dates of non-observed returns from 1967 to 1974 are calculated using the Minor Planet & Comet Ephemeris Service.