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Periodic Comets Seen Once, But Never Recovered

Designation Name Discovered Last T Next T Period D/1766 G1 Helfenzrieder 1766 1766 Lost 4.35 D/1770 L1 Lexell 1770 1770 Lost 5.60 D/1819 W1 Blanpain 1819 1819 Lost 5.10 D/1884 O1 Barnard 1 1884 1884 Lost 5.38 D/1886 K1 Brooks 1 1886 1886 Lost 5.44 D/1894 F1 Denning 1894 1894 Lost 7.40 D/1895 Q1 Swift 1895 1895 Lost 7.20 D/1918 W1 Schorr 1918 1918 Lost 6.67 D/1921 H1 Dubiago 1921 1921 Lost? 62.3 D/1952 B1 Harrington-Wilson 1951 1951 Lost 6.35 D/1977 C1 Skiff-Kosai 1977 1976 Lost 7.54 D/1978 R1 Haneda-Campos 1978 1978 Lost 5.97 D/1993 F2 Shoemaker-Levy 9 1993 1994 Hit Jupiter 17.8

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