Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future
67P2021 Nov. 2 67P2015 Aug. 13 67P2009 Feb. 28 67P2002 Aug. 18 67P1996 Jan. 17 67P1989 June 18 67P1982 Nov. 12 67P/1975 P11976 Apr. 7 67P/1969 R11969 Sept.11