18D/Perrine-Mrkos

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Total 6,336 html files since Dec. 4, 1995 Updated on February 21, 2004

Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2009 Apr. 17 2002 Sept.10 1995 Dec. 6 1989 Feb. 28 1982 May 16 1975 Aug. 2 18D 1968 Nov. 1 18D 1962 Feb. 12 18D/1955 U1 1955 Sept.27 1949 Apr. 5 1942 Sept.22 1936 Feb. 24 1929 July 26 1922 Dec. 23 1916 May 22 18D/1909 P1 1909 Nov. 1 1903 Apr. 22 18D/1896 X1 1896 Nov. 25

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996. The perihelion dates of non-observed returns from 1903 to 1989 are calculated using the Minor Planet & Comet Ephemeris Service.