Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future
50P2024 May 12 50P2016 Feb. 8 50P2007 Nov. 1 50P1999 Aug. 3 50P1991 May 26 50P1983 May 22 50P1975 May 24 50P1967 June 13 50P/1959 N11959 Sept. 1 50P/1951 T11951 Nov. 23