109P/Swift-Tuttle

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Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2126 July 12 109P/1992 S2 1992 Dec. 12 109P/1862 O1 1862 Aug. 23 109P/1737 N1 1737 June 15 1610 Feb. 6 1479 Oct. 18 1348 May 2 1212 Nov. 5 1079 Sept.17 950 Apr. 20 826 Apr. 20 698 Sept. 6 569 Mar. 1 441 Nov. 3 316 Oct. 27 109P/ 188 O1 188 July 10 59 May 18 109P/ -68 Q1 -68 Aug. 27

The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996. The perihelion date in the next return is calculated by Kazuo Kinoshita (http://www9.ocn.ne.jp/~comet/pcmtn/0109p.htm). The perihelion dates of non-observed returns from 59 to 1610 are calculated by Kenji Muraoka. The appearance in 1737 is printed on IAUC 5620. The appearances in -68 and 188 are printed on IAUC 5670 and IAUC 5671.