Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future
2027 July 30 231P2019 June 14 231P/2009 X12011 May 16 231P/2003 CP72003 Apr. 29 1995 June 1 1987 Oct. 29 1980 Apr. 8 1972 Sept. 29 1965 Mar. 14 1957 Sept. 8 231P1950 Feb. 23