List of Halley-type comets

The following is a list of Halley-type comets, 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, their orbits 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 are actually officially classified as either Jupiter-family comets or Chiron-type comets, based on their Jupiter Tisserand's parameter. Although JFCs are classically defined by, they're officially defined by. CTCs, on the other hand, are officially defined by. Since they do not include any period-related constraints, some of the 20-200 year-period comets unfortunately match one of the classifications, making comet classifications even more vague.

Numbered HTCs

For the 14 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.

Comet designation	Comet name	Eccentricity	Semimajor axis	Period	Inclination	Perihelion distance	Absolute magnitude	Last perihelion	Next perihelion	Ref
C/1917 F1	Mellish	0.993121	27.6473325	145	32.6828	0.190186		1917/04/11	2062
C/1921 H1	Dubiago	0.86	8	22	22.11	1.1008		1921/05/04	2031
C/1937 D1	Wilk	0.981098	32.7445244	187	26.0205	0.618937		1937/02/21	2124
C/1942 EA	Väisälä	0.933639	19.3951116	85.4	37.9961	1.287079		1942/02/15	2027/07/10
C/1984 A1	Bradfield 1	0.9524	28.5	152.3	51.8005	1.35751	9.6	1983/12/27	2136/04/01
C/1989 A3	Bradfield	0.977708	18.853	81.9	83.0672	0.420271		1988/12/05	2070/11/01
C/1991 L3	Levy	0.928811	13.8018	51.28	19.19031	0.982545	8.8	1991/07/08	2042/10/19
P/1997 B1	Kobayashi	0.76076	8.588	25.17	12.3495	2.05455	12.3	1997/03/02	2022/06/06
C/1998 G1	LINEAR	0.8237	12.099	42.08	109.714	2.1333	10.8	1998/11/16	2040/12/15
C/1998 Y1	LINEAR	0.9239	22.956	110	28.1082	1.74699	14	1998/11/21	2108/11/15
C/1999 E1	Li	0.76011	16.341	66.06	46.88108	3.92002	8.3	1998/01/31	2065/02/21
C/1999 G1	LINEAR	0.856	28.1	149	76.55	4.048	8	1998/08/01	2150
C/1999 K4	LINEAR	0.92	20	70	120.8	1.442	18.5	1999/05/16	2069/06/08
C/1999 S3	LINEAR	0.89995	18.94	82.43	70.5607	1.894939	4.9	1999/11/09	2081/04/04
C/1999 XS87	LINEAR	0.84057	17.386	72.5	14.8464	2.7718	10.9	1999/08/06	2072/02/04
C/2000 D2	LINEAR	0.867	17.2	72	156.992	2.2975	13.7	2000/03/08	2072
C/2000 G2	LINEAR	0.805	14	52	170.4785	2.716	12.8	2000/02/05	2052
C/2000 S3	LONEOS	0.7723	11.69	39.97	25.164	2.6622	6.4	2000/07/16	2040/07/10
C/2001 M10	NEAT	0.80107	26.657	137.63	28.08349	5.30275	9.4	2001/06/21	2139/02/01
C/2001 OG108	LONEOS	0.9252595	13.3	48.5	80.24505	0.9940479	13.2	2002/03/15	2050/09/13
P/2001 Q6	NEAT	0.82386	7.9946	22.61	56.8553	1.408179	13.3	2001/11/09	2024/06/20
C/2001 W2	BATTeRS	0.94136	17.925	75.89	115.9131	1.051065	12.1	2001/12/23	2077/11/15
C/2002 A1	LINEAR	0.72281	16.992	70.04	14.03393	4.70996	8.6	2001/11/26	2071/12/11
C/2002 A2	LINEAR	0.72482	17.103	70.74	14.0386	4.70659	7.5	2001/12/05	2072/09/01
C/2002 B1	LINEAR	0.77102	9.9183	31.24	51.0214	2.27113	6.3	2002/04/20	2032/06/17
C/2002 CE10	LINEAR	0.791486	9.81595	30.75	145.4587	2.0467593	10.8	2003/06/22	2034/03/23
C/2002 K4	NEAT	0.84232	17.532	73.41	94.0632	2.76453	11.4	2002/07/12	2075/12/01
P/2002 T6	NEAT–LINEAR	0.557348	7.6519	21.17	11.00927	3.387103	5.9	2003/06/27	2024/08/28
C/2003 E1	NEAT	0.76359	13.7263	50.86	33.53785	3.245004	10.6	2004/02/13	2054/12/24
C/2003 F1	LINEAR	0.80605	20.664	93.93	70.2216	4.007806	8.3	2003/06/28	2097/06/02
P/2003 QX29	NEAT	0.4718	8.0255	22.74	11.3965	4.239	6.1	2002/10/26	2025/07/21
C/2003 R1	LINEAR	0.89331	19.7	87.44	149.19563	2.10188	12.7	2003/06/29	2090/12/15
C/2003 U1	LINEAR	0.9216	22.9	109.6	164.4745	1.79572	15.2	2003/11/03	2113
C/2003 W1	LINEAR	0.93429	25.15	126.1	78.0756	1.65241	13.5	2003/11/09	2130
P/2004 A1	LONEOS	0.30841	7.89853	22.2	10.57568	5.462544	10	2004/08/26	2026/11/07
C/2004 C1	Larsen	0.6231	11.566	39.33	28.918	4.3594	10	2003/03/19	2042/09/01
P/2004 DO29	Spacewatch–LINEAR	0.45151	7.4655	20.4	14.5358	4.09475	10.3	2004/10/11	2025/03/06
P/2004 V5-A	LINEAR–Hill	0.445217	7.95059	22.42	19.358136	4.410853	8.8	2005/02/28	2027/07/31
P/2004 V5-B	LINEAR–Hill	0.445233	7.95092	22.42	19.35822	4.41091	9.2	2005/03/01	2027/08/02
C/2005 N5	Catalina	0.94327	28.687	153.65	21.37879	1.6274	12.9	2005/08/22	2159/01/01
C/2005 O2	Christensen	0.85939	23.707	115.43	148.89204	3.33358	5.2	2005/09/08	2121/02/15
P/2005 S2	Skiff	0.1967	7.965	22.48	3.141	6.398	7.9	2006/06/30	2028/12/22
P/2005 T3	Read	0.174	7.509	20.58	6.26	6.202	9.2	2006/01/13	2026/08/15
P/2005 T4	SWAN	0.93	9.3	28.4	160.0362	0.649399	15.4	2005/10/10	2034
C/2005 W2	Christensen	0.82446	18.979	82.68	11.26403	3.33162	10.8	2006/03/27	2096/12/01
C/2006 F2	Christensen	0.65138	12.324	43.27	20.511	4.2965	10.6	2006/05/30	2049/09/06
P/2006 HR30	Siding Spring	0.8431184	7.81754	21.86	31.884499	1.2264277	11.7	2007/01/02	2028/11/12
C/2006 U7	Gibbs	0.6309	11.99	41.51	57.762	4.425	11.6	2007/03/28	2048/10/01
C/2007 S2	Lemmon	0.557056	12.5477	44.45	16.86305	5.557931	9	2008/09/14	2053/02/25
C/2008 E1	Catalina	0.54815	10.687	34.94	35.03769	4.82891	9.1	2008/08/11	2043/07/31
P/2008 O3	Boattini	0.6949	8.186	23.42	32.2699	2.4973	5.1	2008/06/03	2031/11/03
C/2008 R3	LINEAR	0.89641	18.428	79.11	43.23793	1.909035	13.5	2008/11/22	2088/01/01
P/2008 Y3	McNaught	0.44766	8.0281	22.75	38.81318	4.434241	8.7	2009/01/11	2031/10/12
P/2009 O3	Hill	0.68688	7.8244	21.89	16.2176	2.44999	12	2009/05/18	2031/04/08
P/2009 Q5	McNaught	0.609061	7.4654	20.4	40.9048	2.91851	10.5	2009/09/08	2030/02/02
P/2009 T2	La Sagra	0.768991	7.596	20.94	28.10639	1.75475	14.2	2010/01/12	2030/12/21
P/2010 E2	Jarnac	0.72237	8.6402	25.4	15.437	2.39874	14.4	2010/04/07	2035/08/31
C/2010 E5	Scotti	0.84274	24.73	122.96	18.9102	3.8884	6.1	2009/11/21	2132/11/01
P/2010 J3	McMillan	0.72682	8.9871	26.94	13.25507	2.45511	11.6	2010/08/23	2037/08/01
P/2010 JC81	WISE	0.77735	8.13307	23.19	38.69025	1.8108311	10.3	2011/04/26	2034/07/04
C/2010 L5	WISE	0.904	8.2	23.6	147.052	0.7909	17.4	2010/04/23	2033
C/2011 J3	LINEAR	0.9258	19.56	86.5	114.7124	1.451	13.1	2011/01/24	2097
P/2011 JB15	Spacewatch–Boattini	0.31874	7.3668	20	19.14127	5.01871	5.5	2012/01/21	2032/01/21
C/2011 L1	McNaught	0.79678	11.034	36.66	65.512	2.24237	10.6	2010/12/18	2047/08/15
P/2011 P1	McNaught	0.3598	7.741	21.54	6.1741	4.9556	8.2	2010/07/22	2032/02/04
C/2011 P2	PANSTARRS	0.36982	9.7562	30.47	8.98964	6.1481	6.7	2010/09/13	2041/03/04
P/2011 S1	Gibbs	0.20305	8.6545	25.46	2.6792	6.8972	5.5	2014/08/20	2040/02/04
C/2011 S2	Kowalski	0.9316	16.304	65.83	17.57253	1.115118	14.8	2011/10/26	2077/08/25
C/2011 Y3	Boattini	0.705	11.85	40.82	26.517	3.4978	11.7	2011/08/22	2052/06/17
C/2012 BJ98	Lemmon	0.87365	17.068	70.52	2.6369	2.156577	8.1	2012/09/20	2083/03/29
P/2012 C3	PANSTARRS	0.6264	9.7	30.2	9.19	3.625	13.5	2011/10/05	2042
C/2012 H2	McNaught	0.8936	16.14	64.9	92.8355	1.71678	15.7	2012/05/03	2077
P/2012 NJ	La Sagra	0.848062	8.5027	24.79	84.37546	1.2918901	13.1	2012/06/13	2037/03/28
C/2012 Q1	Kowalski	0.63722	26.138	133.63	45.181	9.48222	4.7	2012/02/09	2145/10/01
C/2012 T6	Kowalski	0.87634	14.354	54.38	33.2755	1.77509	15.7	2012/08/26	2067/01/15
C/2012 X2	PANSTARRS	0.77052	20.69	94.12	34.12389	4.74816	9.6	2013/03/31	2107/05/14
C/2012 Y3	McNaught	0.93993	29.38	159.3	73.2318	1.76482	10.4	2012/08/25	2172
C/2013 C2	Tenagra	0.4293	16.001	64.01	21.34426	9.1321	4.4	2015/08/28	2080/09/01
C/2013 D1	Holvorcem	0.78088	11.227	37.62	10.09356	2.46013	13.5	2013/04/13	2050/11/25
P/2013 N3	PANSTARRS	0.5924	7.431	20.26	2.17041	3.0289	6.6	2014/02/11	2034/05/17
P/2013 P1	PANSTARRS	0.6053	8.588	25.17	18.702	3.3902	11.6	2013/02/26	2038/04/29
C/2013 P4	PANSTARRS	0.59636	14.783	56.84	4.26425	5.96703	5.1	2014/08/12	2071/06/15
C/2013 U1	Catalina	0.7971	11.92	41.17	23.9415	2.4188	13.9	2013/11/18	2055/01/01
C/2013 V3	Nevsky	0.89097	12.718	45.36	32.1345	1.386693	15.2	2013/10/29	2059/03/09
C/2013 W2	PANSTARRS	0.561	10.13	32.23	4.5436	4.448	5.8	2015/01/08	2047/03/15
C/2014 F3	Sheppard–Trujillo	0.65	16.3	66	6.48	5.7	6.1	2021/04/17	2087
C/2014 HU195	Valdes–TOTAS	0.76580	21.867	102.25	5.82227	5.12113	14.6	2015/05/18	2117/08/14
C/2014 J1	Catalina	0.802	8.64	25.4	159.696	1.7085	16.8	2014/06/20	2039
P/2014 L3	Hill	0.77309	8.1706	23.36	6.264	1.85396	13.7	2014/06/28	2037/11/06
P/2014 O3	PANSTARRS	0.3847	7.544	20.72	7.81	4.642	10.4	2014/04/16	2035/01/04
C/2014 Q3	Borisov	0.94207	28.436	151.64	89.94888	1.647408	8.8	2014/11/19	2166/07/10
C/2014 TG64	Catalina	0.7824	14.89	22.283	3.2391	3.24	6.4	2014/05/26	2072
C/2014 W7	Christensen	0.869	11.3	38	98.314	1.4881	16.3	2014/12/31	2052
C/2014 W9	PANSTARRS	0.8577	11.16	37.28	10.6302	1.5874	15.5	2015/02/15	2052/04/01
C/2014 W11	PANSTARRS	0.650255	9.7980	30.67	12.70679	3.426805	8.8	2015/06/17	2036/04/16
C/2015 A1	PANSTARRS	0.900816	20.119	90.24	80.36576	1.995505	6.9	2015/03/13	2105/06/09
P/2015 A3	PANSTARRS	0.85	7.6	21	172.51	1.154	20.2	2015/02/22	2036
P/2015 B1	PANSTARRS	0.38250	9.6772	30.10	18.027	5.97567	8.7	2015/09/19	2045/10/26
P/2015 B4	Lemmon–PANSTARRS	0.56894	8.7121	25.72	1.74262	3.75540	11.7	2015/02/17	2030/12/04
C/2015 D2	PANSTARRS	0.56826	12.985	46.79	31.8339	5.6060	6.3	2013/09/27	2060/07/13
C/2015 D5	Kowalski	0.4996	9.145	27.66	20.3990	4.576	6.0	2014/04/16	2041/12/12
C/2015 F5	SWAN–XingMing	0.97764	15.47	60.9	149.2590	0.345995	17.6	2015/03/28	2075/02/01
C/2015 GX	PANSTARRS	0.878198	16.1883	65.13	90.25454	1.971753	14.4	2015/08/26	2080/10/09
C/2015 H1	Bressi	0.94078	32.53	185.5	140.65558	1.92636	6.6	2015/03/28	2200/10/07
P/2015 Q2	Pimentel	0.7544	7.407	20.16	146.2022	1.81912	15.3	2015/09/10	2035/11/06
C/2015 T5	Sheppard–Tholen	0.6661	27.97	147.9	11.0483	9.3383	7.7	2016/01/24	2164
C/2015 V4	PANSTARRS	0.70567	18.550	79.89	60.7513	5.45972	8.7	2016/08/27	2096/07/19
C/2015 X2	PANSTARRS	0.8791	15.75	62.5	72.458	1.90456	16.1	2015/12/20	2078/06/25
C/2015 X4	Elenin	0.812807	18.1345	77.23	29.50491	3.39466	10.1	2015/11/03	2093/02/14
C/2015 X8	NEOWISE	0.9393	19.6	86.9	155.2817	1.1903	14.1	2015/10/23	2099/09/13
C/2015 YG1	NEOWISE	0.87924	17.169	71.14	57.3360	2.07341	12.3	2015/09/28	2086/11/17
P/2016 A3	PANSTARRS	0.3778	7.6979	21.36	8.5929	4.7895	5.4	2017/04/13	2038/08/22
C/2016 Q4	Kowalski	0.5781	16.79	68.8	7.2567	7.084	7.0	2018/01/28	2086
C/2016 S1	PANSTARRS	0.70887	8.285	23.85	94.6898	2.41193	7.5	2017/03/16	2041/01/20
P/2016 WM48	Lemmon	0.7867	8.1954	23.46	117.5476	1.7480	16.8	2017/02/26	2040
C/2017 C1	NEOWISE	0.9263697	20.7832	92.08	65.73154	1.50172		2017/01/19	2109
P/2017 D4	PANSTARRS	0.62898	7.424	20.23	10.3396	2.7545	12.7	2016/09/06	2036/11/29
C/2017 E2	Tsuchinshan	0.89085	21.5567	100.09	79.1686	2.35295	11.3	2016/05/12	2116/06/14
P/2017 G1	PANSTARRS	0.66134	7.7387	21.53	3.534	2.621	13.1	2016/05/14	2037/11/23
P/2017 G2	PANSTARRS	0.65031	8.1394	23.22	47.90625	2.846	12.9	2017/06/13	2040/09/02
C/2017 K4	ATLAS	0.90571	28.0883	148.87	16.67822	2.64824	7.2	2018/01/08	2167
P/2017 P1	PANSTARRS	0.3088	7.86566	22.06	7.7013	5.43665	10.1	2018/06/18	2040/07/10
C/2017 S2	PANSTARRS	0.82406	20.5400	93.09	12.67723	3.613	13.2	2017/08/28	2110
C/2017 U5	PANSTARRS	0.74457	16.939	69.72	18.9566	4.32676	11.8	2017/12/19	2087/09/07
C/2017 W2	Leonard	0.7115	13.7176	50.81	98.1831	3.958	10.9	2017/11/02	2068
P/2017 W3	Gibbs	0.5039	7.734	21.51	18.317	3.8373	10.5	2018/02/25	2039/08/30
C/2017 X1	PANSTARRS	0.8511	31.3092	175.19	31.3106	4.6624	9.6	2018/06/14	2193
P/2017 Y3	Leonard	0.8703	9.838	30.86	27.5859	1.2753	13.6	2018/02/11	2049
C/2018 A1	PANSTARRS	0.9061	25.8169	131.18	53.6213	2.4233	13.1	2017/10/20	2148
C/2018 A6	Gibbs	0.8273	17.434	72.80	77.454	3.011	8.9	2019/07/08	2092
C/2018 DO4	Lemmon	0.9069	29.847	131.40	160.475	2.406	13.7	2019/08/18	2151
C/2018 K1	Weiland	0.9371	29.890	163.42	164.193	1.879	11.9	2018/04/06	2182
C/2018 M1	CSS	0.9409	22.087	103.81	37.265	1.304	15.9	2018/07/10	2122
C/2018 O1	ATLAS	0.944	27.864	147.09	154.041	1.558	12.6	2018/08/31	2165
C/2018 R5	Lemmon	0.8418	22.8947	109.55	103.76	3.6213	6	2019/01/09	2128
C/2018 V2	ATLAS	0.9034	25.616	129.65	159.111	2.475	14.5	2018/11/26	2148
C/2018 W1	CSS	0.938	21.779	101.64	83.273	1.36	15.648	2019/05/11	2120
C/2018 X3	PANSTARRS	0.783	12.41686	43.75	43.368	2.69887	15.5	2018/12/30	2062
P/2018 Y2	Africano	0.4878	7.543	20.72	11.48886	3.8635	11	2018/12/13	2039
C/2019 A5	PANSTARRS	0.7080	21.6608	100.81	67.5310	6.3242	9.4	2019/06/09	2119
C/2019 L1	PANSTARRS	0.7065	9.8474	30.90	9.993	2.88986	13.6	2019/08/11	2050
C/2019 L2	NEOWISE	0.9370	25.72	130.48	152.19	1.622	10.3	2019/04/02	2149
C/2019 LB7	Kleyna	0.9293	35.1204	208.14	164.23	2.483	18.1	2019/03/27	2227
C/2019 T5	ATLAS	0.8092	8.014	22.69	33.42	1.5289	14.9	2019/08/01	2042
P/2019 V2	Groeller	0.333	7.523	20.63	11.8	5.0183	9.8	2020/10/21	2041
C/2019 Y4-C	ATLAS	0.9888	23.187	111.65	44.02	0.2589	14.5	2020/05/31	2132
C/2019 Y4-E	ATLAS	0.987	19.775	87.94	45.085	0.2525	16.3	2020/05/31	2108

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The 48 Laws of Power - non-fiction book by American author Robert Greene. The book...

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Game of Thrones - American fantasy drama television series created by David Benioff and D. B. Weiss for HBO. It...
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