64P/Swift-Gehrels

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Updated on March 4, 2023

Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2028 Mar. 31 64P 2018 Nov. 3 64P 2009 June 14 64P 2000 Apr. 21 64P 1991 Feb. 22 64P 1981 Nov. 27 64P/1973 C1 1972 Aug. 31 1963 May 31 1954 Apr. 3 1944 Dec. 24 1935 Sept.13 1926 June 9 1917 May 8 1908 Mar. 29 1899 Feb. 1 64P/1889 W1 1889 Nov. 30

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996. The perihelion dates of non-observed returns from 1908 to 1963 are calculated using the Minor Planet & Comet Ephemeris Service. The perihelion date of non-observed return in 1899 is calculated by Kazuo Kinoshita (http://www9.ocn.ne.jp/~comet/pcmtn/0064p.htm).