100P/Hartley 1

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Updated on June 28, 2023

Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2028 Dec. 15 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.