20D/Westphal

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Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2038 May 4 1976 Jan. 3 20D/1913 S1 1913 Nov. 26 20D/1852 O1 1852 Oct. 13

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996. The perihelion date in 1976 is calculated using the Minor Planet & Comet Ephemeris Service.