100P/Hartley 1

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Updated on February 5, 2022

Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 100P 2022 Aug. 10 100P 2016 Apr. 2 100P 2009 Dec. 6 100P 2003 Aug. 18 100P 1997 May 28 100P/1991 E1 1991 May 17 100P/1985 L1 1985 June 11

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.