The following is a list of Halley-type comets (HTCs), which are periodic comets with an orbital period between 20 and 200 years, often appearing only once or twice within one's lifetime. The majority come from between the orbits of Saturn and Neptune. Due to the nature of their orbits, they can be perturbed by the giant planets and sent into orbits too far from the Sun to outgas, and vice versa. Minor planets in comet-like orbits similar to HTCs that never come close enough to the Sun to outgas are called centaurs. HTCs are named after the first discovered member, and the first discovered periodic comet, Halley's Comet, which orbits the Sun in about 75 years, and passing as far as the orbit of Neptune.

Most of the comets that have a period between 20 and 200 years (making them HTCs based on the classical definition) are actually officially classified as either Jupiter-family comets (JFCs) or Chiron-type comets (CTCs), based on their Jupiter Tisserand's parameter (TJupiter). Although JFCs are classically defined by (P < 20 y), they are officially defined by (2 < TJupiter < 3). CTCs, on the other hand, are officially defined by (TJupiter > 3; a > aJupiter). Since they do not include any period-related constraints, some of the 20–200 year-period comets match one of the classifications, making comet classifications even more vague.

Numbered HTCs

For the 15 numbered HTCs, see the list of numbered comets, where they are labelled "HTC" in column "class".

Unnumbered HTCs This list contains only Halley-type comets which are not numbered yet because they have been observed only once. Comets that belong to a different comet classification based on its Jupiter Tisserand parameter are given its alternative classification next to the comets' name.

Before 2000 Comet designation Name/ discoverer(s) Period (years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Last observed perihelion Next perihelion Ref C/1917 F1 Mellish 145 0.993121 27.6473325 0.190186 32.6828 1917/04/11 2062 C/1921 H1 Dubiago 70.8 0.9348 17.102 1.116 22.34 1921/05/04 2062 C/1937 D1 Wilk 187 0.981098 32.7445244 0.618937 26.0205 1937/02/21 2124 C/1942 EA Väisälä 85.4 0.933639 19.3951116 1.287079 37.9961 1942/02/15 2027/07/10 C/1984 A1 Bradfield 1 152.3 0.9524 28.5 1.35751 51.8005 9.6 1983/12/27 2136/04/01 C/1989 A3 Bradfield 81.9 0.977708 18.853 0.420271 83.0672 1988/12/05 2070/11/01 C/1991 L3 Levy 51.28 0.928811 13.8018 0.982545 19.19031 8.8 8.2 km 1991/07/08 2042/10/19 C/1998 G1 LINEAR 42.08 0.8237 12.099 2.1333 109.714 10.8 1998/11/16 2040/12/15 C/1998 Y1 LINEAR 110 0.9239 22.956 1.74699 28.1082 14 1998/11/21 2108/11/15 C/1999 E1 Li 66.06 0.76011 16.341 3.92002 46.88108 8.3 1998/01/31 2065/02/21 C/1999 G1 LINEAR 149 0.856 28.1 4.048 76.55 8 1998/08/01 2150 C/1999 K4 LINEAR 70 0.92 20 1.442 120.8 18.5 1999/05/16 2069/06/08 C/1999 S3 LINEAR 82.43 0.89995 18.94 1.894939 70.5607 4.9 1999/11/09 2081/04/04 LINEAR (*JFC) 72.5 0.84057 17.386 2.7718 14.8464 10.9 1999/08/06 2072/02/04

2000s Comet designation Name/ discoverer(s) Period (years) e a(AU) q(AU) i(°) Abs. mag (M1) Nucleus radii Last observed perihelion Next perihelion Ref C/2000 D2 LINEAR 72 0.867 17.2 2.2975 156.992 13.7 2000/03/08 2072 C/2000 G2 LINEAR 52 0.805 14 2.716 170.4785 12.8 2000/02/05 2052 C/2000 S3 LONEOS (*JFC) 39.97 0.7723 11.69 2.6622 25.164 6.4 2000/07/16 2040/07/10 C/2001 M10 NEAT (*JFC) 137.63 0.80107 26.657 5.30275 28.08349 9.4 12 km 2001/06/21 2139/02/01 LONEOS 48.5 0.9252595 13.3 0.9940479 80.24505 13.2 7.6 km 2002/03/15 2050/09/13 C/2001 W2 BATTeRS 75.89 0.94136 17.925 1.051065 115.9131 12.1 2001/12/23 2077/11/15 C/2002 A1 LINEAR (*JFC) 70.04 0.72281 16.992 4.70996 14.03393 8.6 2001/11/26 2071/12/11 C/2002 A2 LINEAR (*JFC) 70.74 0.72482 17.103 4.70659 14.0386 7.5 11.6 km 2001/12/05 2072/09/01 C/2002 B1 LINEAR 31.24 0.77102 9.9183 2.27113 51.0214 6.3 2002/04/20 2032/06/17 LINEAR 30.75 0.791486 9.81595 2.0467593 145.4587 10.8 8.95 km 2003/06/22 2034/03/23 C/2002 K4 NEAT 73.41 0.84232 17.532 2.76453 94.0632 11.4 2002/07/12 2075/12/01 C/2003 E1 NEAT (*JFC) 50.86 0.76359 13.7263 3.245004 33.53785 10.6 2004/02/13 2054/12/24 C/2003 F1 LINEAR 93.93 0.80605 20.664 4.007806 70.2216 8.3 2003/06/28 2097/06/02 C/2003 R1 LINEAR 87.44 0.89331 19.7 2.10188 149.19563 12.7 2003/06/29 2090/12/15 C/2003 U1 LINEAR 109.6 0.9216 22.9 1.79572 164.4745 15.2 2003/11/03 2113 C/2003 W1 LINEAR 126.1 0.93429 25.15 1.65241 78.0756 13.5 2003/11/09 2130 C/2004 C1 Larsen (*JFC) 39.33 0.6231 11.566 4.3594 28.918 10 2003/03/19 2042/09/01 P/2004 V5-A LINEAR–Hill (*JFC) 22.42 0.445217 7.95059 4.410853 19.358136 8.8 1.7 km 2005/02/28 2027/07/31 P/2004 V5-B LINEAR–Hill (*JFC) 22.42 0.445233 7.95092 4.41091 19.35822 9.2 9.2 km 2005/03/01 2027/08/02 C/2005 N5 Catalina 153.65 0.94327 28.687 1.6274 21.37879 12.9 2005/08/22 2159/01/01 C/2005 O2 Christensen 115.43 0.85939 23.707 3.33358 148.89204 5.2 2005/09/08 2121/02/15 P/2005 S2 Skiff (*CTC) 22.48 0.1967 7.965 6.398 3.141 7.9 2006/06/30 2028/12/22 P/2005 T3 Read (*CTC) 20.58 0.174 7.509 6.202 6.26 9.2 2006/01/13 2026/08/15 P/2005 T4 SWAN 28.4 0.93 9.3 0.649399 160.0362 15.4 2005/10/10 2034 C/2005 W2 Christensen (*JFC) 82.68 0.82446 18.979 3.33162 11.26403 10.8 0.52 km 2006/03/27 2096/12/01 C/2006 F2 Christensen (*JFC) 43.27 0.65138 12.324 4.2965 20.511 10.6 2006/05/30 2049/09/06 Siding Spring 21.86 0.8431184 7.81754 1.2264277 31.884499 11.7 8 km 2007/01/02 2028/11/12 C/2006 U7 Gibbs (*JFC) 41.51 0.6309 11.99 4.425 57.762 11.6 2007/03/28 2048/10/01 C/2007 S2 Lemmon (*JFC) 44.45 0.557056 12.5477 5.557931 16.86305 9 0.5 km 2008/09/14 2053/02/25 C/2008 E1 Catalina (*JFC) 34.94 0.54815 10.687 4.82891 35.03769 9.1 4.8 km 2008/08/11 2043/07/31 P/2008 O3 Boattini (*JFC) 23.42 0.6949 8.186 2.4973 32.2699 5.1 2008/06/03 2031/11/03 C/2008 R3 LINEAR 79.11 0.89641 18.428 1.909035 43.23793 13.5 2008/11/22 2088/01/01 P/2008 Y3 McNaught (*JFC) 22.75 0.44766 8.0281 4.434241 38.81318 8.7 3.55 km 2009/01/11 2031/10/12 P/2009 O3 Hill (*JFC) 21.89 0.68688 7.8244 2.44999 16.2176 12 2009/05/18 2031/04/08 P/2009 Q5 McNaught (*JFC) 20.4 0.609061 7.4654 2.91851 40.9048 10.5 2009/09/08 2030/02/02 P/2009 T2 La Sagra (*JFC) 20.94 0.768991 7.596 1.75475 28.10639 14.2 1.16 km 2010/01/12 2030/12/21

2010s