Damocloid Explained

Damocloids are a class of minor planets such as 5335 Damocles and 1996 PW that have Halley-type or long-period highly eccentric orbits typical of periodic comets such as Halley's Comet, but without showing a cometary coma or tail. David Jewitt defines a damocloid as an object with a Jupiter Tisserand invariant (T_J) of 2 or less, while Akimasa Nakamura defines this group with the following orbital elements:

q < 5.2 AU, a > 8.0 AU, and e > 0.75,
or alternatively, i > 90°

However, this definition that does not focus on Jupiter excludes objects such as,, and .

Using the Tisserand's parameter with respect to Jupiter of 2 or less, there are currently 220 damocloid candidates . Of these objects, 189 have orbital observation arcs greater than 30 days providing reasonably decent orbits. Their average radius is eight kilometers assuming an albedo of 0.04. The albedos of four damocloids have been measured, and they are among the darkest objects known in the Solar System. Damocloids are reddish in color, but not as red as many Kuiper-belt objects or centaurs. Other damocloids include:,,,, and 20461 Dioretsa.

Retrograde objects such as Halley's Comet and damocloid 343158 Marsyas can have relative velocities to Earth of .

Origin

Damocloids are thought to be nuclei of Halley-type comets that have lost all their volatile materials due to outgassing and become dormant. Such comets probably originate from the Oort cloud. This hypothesis is strengthened by the fact that a number of objects thought to be damocloids (and assigned minor-planet provisional designations) subsequently showed a coma and were confirmed to be comets: C/2001 OG₁₀₈ (LONEOS), (LINEAR), (LINEAR), (Spacewatch) and possibly others. Another strong indication of cometary origin is the fact that some damocloids have retrograde orbits, unlike any other minor planets. (Objects with an inclination beyond 90 degrees up to 180 degrees are in a retrograde orbit and orbit in the opposite direction of other objects.)

List

this list from the JPL SBDB contains 20 numbered and 268 unnumbered bodies that meet Akimasa Nakamura's criteria for being classified as a damocloid, that is, either a retrograde orbit, or the following orbital elements: q < 5.2 AU, a > 8.0 AU, and e > 0.75 (also see). Tisserand's parameter with respect to Jupiter (T_Jupiter) is also given. Akimasa Nakamura's criteria and a T_Jupiter of less than two are largely equivalent as only a few listed bodies do not meet the defined T_Jupiter threshold. Most damocloids are also listed on MPC's list of other unusual minor planets. The orbital data is sourced from JPL-numbered and -unnumbered element files. The list includes A/-designated objects (introduced in 2017) that were mistakenly identified as a comet, but are actually minor planets. However it excludes hyperbolic bodies such as A/2019 G4 as well as 1I/ʻOumuamua and 2I/Borisov, two interstellar objects.

Designation	a (AU)	e	i (°)	Orbital criteria and classes				q (AU)	Q (AU)	Unusual	Catalog	Refs
Designation	a (AU)	e	i (°)	Cls	Retro	T_Jupiter	T_J ≤ 2	q (AU)	Q (AU)	Unusual	Catalog	Refs
5335 Damocles	11.85	0.866	61.6	CEN	—	1.158		1.59	22.11	—
	9.37	0.774	35	CEN	—	1.948		2.12	16.63	unusual
20461 Dioretsa	23.88	0.901	160.4	CEN		-1.534		2.37	45.39	unusual
	53.66	0.954	119.3	TNO		-0.844		2.46	104.86	unusual
	14.23	0.76	3.3	CEN	—	2.513	—	3.42	25.04	unusual
	8.12	0.562	170.3	CEN		-1.397		3.56	12.69	unusual
	278.33	0.966	140.7	TNO		-2.903		9.42	547.23	—
	11.58	0.442	105.1	CEN		-0.246		6.47	16.7	—
343158 Marsyas	2.53	0.807	154.4	NEO		1.317		0.49	4.57	—
(434620) 2005 VD	6.67	0.251	172.9	CEN		-1.394		5	8.34	unusual
	10.9	0.401	165.5	CEN		-2.090		6.53	15.27	—
	191.63	0.954	125.3	TNO		-2.069		8.74	374.53	—
	35.7	0.33	110.2	TNO		-1.560		23.9	47.5	—
514107 Kaʻepaokaʻawela	5.13	0.378	163.1	other		-0.745		3.19	7.07	—
	24.54	0.615	93.6	CEN		-0.005		9.45	39.62	—
	71.46	0.853	144	TNO		-3.061		10.53	132.38	—
	54.3	0.798	161.7	TNO		-3.601		10.96	97.63	—
	42.03	0.497	103.4	TNO		-1.021		21.15	62.92	—
	246.87	0.954	176	TNO		-4.117		11.46	482.29	—
	83.6	0.841	137.9	TNO		-3.151		13.26	153.94	—
	8.17	0.468	151.5	CEN		-1.309		4.35	11.99	—
1996 PW	265.49	0.991	30.1	TNO	—	1.708		2.49	528.5	unusual	—
	26.49	0.943	59.4	CEN	—	0.960		1.51	51.47	—	—
	11.24	0.815	23.7	CEN	—	2.023	—	2.08	20.41	unusual	—
	15.13	0.907	42.5	CEN	—	1.404		1.41	28.85	—	—
	17.77	0.948	19.5	NEO	—	1.405		0.93	34.62	—	—
	52.32	0.956	68.2	TNO	—	0.790		2.31	102.33	unusual	—
	10.77	0.793	129.3	CEN		-0.627		2.23	19.31	unusual	—
	23.66	0.9	158.6	CEN		-1.510		2.37	44.95	unusual	—
	90.21	0.963	45.6	TNO	—	1.630		3.34	177.07	unusual	—
	75.23	0.965	17.6	TNO	—	1.965		2.62	147.84	unusual	—
	564.68	0.995	58.5	TNO	—	1.069		2.67	1126.68	unusual	—
	33.1	0.895	18.9	TNO	—	2.283	—	3.46	62.74	—	—
	14.39	0.846	26.8	CEN	—	1.946		2.22	26.56	unusual	—
	33.28	0.849	4.7	TNO	—	2.818	—	5.02	61.55	—	—
	100.43	0.977	165.6	TNO		-1.781		2.36	198.5	unusual	—
	10.45	0.873	4	CEN	—	1.879		1.33	19.57	—	—
	11.56	0.882	9.2	CEN	—	1.838		1.37	21.76	—	—
	11.29	0.831	35.6	CEN	—	1.794		1.91	20.67	unusual	—
	5.87	0.478	130.5	CEN		-0.327		3.07	8.67	—
2005 OE	63.24	0.952	67.5	TNO	—	0.901		3.05	123.43	unusual	—
	13.54	0.892	23.2	CEN	—	1.727		1.47	25.61	—	—
	29.41	0.905	91.5	CEN		0.124		2.79	56.03	unusual	—
	9.16	0.584	110.3	CEN		-0.180		3.81	14.51	unusual	—
	17.78	0.908	14.2	CEN	—	1.797		1.64	33.91	—	—
	838.42	0.995	112.4	TNO		-0.948		4.1	1672.73	unusual	—
	9.6	0.803	165.3	CEN		-1.024		1.89	17.31	unusual	—
	29.57	0.936	9	CEN	—	1.829		1.88	57.26	—	—
	42.12	0.939	150.2	TNO		-1.571		2.56	81.68	unusual	—
	32.19	0.885	172.1	TNO		-2.133		3.7	60.67	—	—
	25.68	0.921	133.5	CEN		-0.992		2.04	49.32	unusual	—
	9.67	0.76	164.7	CEN		-1.172		2.32	17.02	unusual	—
	19.52	0.832	4.2	CEN	—	2.409	—	3.28	35.77	unusual	—
	8.58	0.811	11	CEN	—	2.081	—	1.62	15.54	—	—
	445.81	0.994	76.5	TNO	—	0.484		2.66	888.96	unusual	—
	21.29	0.926	10.6	CEN	—	1.747		1.58	41	—	—
	24.35	0.941	7.2	CEN	—	1.664		1.43	47.27	—	—
	5.44	0.39	108.3	other		0.364		3.32	7.57	—	—
	30.34	0.914	28.8	TNO	—	1.889		2.61	58.07	unusual	—
	19.35	0.836	17.4	CEN	—	2.288	—	3.17	35.53	unusual	—
	5.69	0.617	96	CEN		0.742		2.18	9.2	—	—
	14.01	0.878	60.2	CEN	—	1.151		1.7	26.31	unusual	—
	23.54	0.917	69.9	CEN	—	0.804		1.95	45.13	unusual	—
	48.87	0.954	107.4	TNO		-0.440		2.23	95.5	—	—
	11.52	0.855	86.4	CEN	—	0.548		1.67	21.37	unusual	—
	20.04	0.923	22.8	CEN	—	1.653		1.55	38.54	—	—
	12.47	0.833	137.8	CEN		-0.852		2.08	22.87	unusual	—
	13.26	0.902	18	CEN	—	1.706		1.3	25.21	—	—
	31.3	0.955	8.7	TNO	—	1.603		1.41	61.2	—	—
	20.16	0.919	147.8	CEN		-1.052		1.63	38.7	—
	10.7	0.792	26.2	CEN	—	2.057	—	2.22	19.17	—	—
	378.15	0.984	143.9	TNO		-2.454		6.11	750.19	—	—
	31.72	0.91	146.1	TNO		-1.538		2.86	60.57	unusual	—
	10.96	0.88	8.1	CEN	—	1.842		1.32	20.6	—	—
	31.63	0.952	156.6	TNO		-1.215		1.5	61.75	—	—
	21.61	0.9	41.4	CEN	—	1.574		2.16	41.06	—	—
	10.89	0.827	8.8	CEN	—	2.083	—	1.88	19.91	—	—
	23.07	0.927	18.6	CEN	—	1.726		1.69	44.45	—	—
	2.09	0.093	92	MBA		2.449	—	1.89	2.28	—	—
	49.39	0.946	29.2	TNO	—	1.844		2.65	96.14	unusual	—
	62.46	0.941	105.2	TNO		-0.533		3.69	121.23	unusual	—
	173.9	0.969	99.9	TNO		-0.462		5.39	342.42	unusual	—
	14.45	0.897	121.6	CEN		-0.414		1.5	27.4	—	—
	24.22	0.898	16.9	CEN	—	2.033	—	2.47	45.96	—	—
	70.08	0.963	53.4	TNO	—	1.262		2.63	137.54	unusual	—
	14.6	0.762	41.6	CEN	—	1.979		3.48	25.72	unusual	—
	44.84	0.932	18.7	TNO	—	2.138	—	3.07	86.62	unusual	—
	10.02	0.793	15.1	CEN	—	2.153	—	2.08	17.96	—	—
	6.28	0.783	123.8	CEN		0.069		1.36	11.19	—	—
	2169.28	0.999	64.7	TNO	—	0.699		1.72	4336.84	unusual	—
	14.86	0.805	25.6	CEN	—	2.160	—	2.9	26.81	—	—
	26.98	0.924	143.9	CEN		-1.219		2.06	51.89	unusual	—
	17.29	0.891	15.2	CEN	—	1.901		1.89	32.7	—	—
	26.1	0.918	118.8	CEN		-0.657		2.14	50.06	unusual	—
	28.67	0.903	25.8	CEN	—	1.996		2.78	54.56	—
	18.82	0.905	27.7	CEN	—	1.711		1.79	35.85	—	—
	13.18	0.78	121.4	CEN		-0.643		2.9	23.46	unusual	—
	22.91	0.939	11.3	CEN	—	1.646		1.4	44.41	—	—
	11.34	0.864	4.5	CEN	—	1.940		1.54	21.15	—	—
	21.06	0.924	3.7	CEN	—	1.780		1.6	40.52	—	—
	15.75	0.4	153.4	CEN		-2.522		9.45	22.06	—	—
	21.26	0.473	100.5	CEN		-0.404		11.2	31.33	—	—
	288.79	0.989	110.4	TNO		-0.745		3.12	574.45	unusual	—
	19.58	0.884	109.3	CEN		-0.334		2.28	36.88	unusual	—
	8.1	0.798	16.2	CEN	—	2.087	—	1.64	14.56	—	—
	8.94	0.78	23.9	CEN	—	2.081	—	1.96	15.92	—	—
	18.56	0.778	24.6	CEN	—	2.439	—	4.12	33	unusual	—
	37.66	0.945	141.6	TNO		-1.239		2.06	73.26	unusual	—
	45.16	0.969	1.2	TNO	—	1.582		1.42	88.9	—	—
	62.79	0.959	146.7	TNO		-1.555		2.55	123.03	unusual	—
	484.17	0.99	70.9	TNO	—	0.906		4.89	963.46	unusual	—
	11.14	0.864	5.3	CEN	—	1.934		1.51	20.76	—	—
	9.58	0.86	5.1	CEN	—	1.920		1.34	17.83	—	—
	13.44	0.884	8	CEN	—	1.877		1.56	25.32	—	—
	29.89	0.882	160	CEN		-1.950		3.53	56.26	—	—
	10.57	0.83	8.5	CEN	—	2.066	—	1.8	19.34	—	—
	6.31	0.478	106.9	CEN		0.262		3.29	9.33	unusual	—
	9.29	0.588	136.1	CEN		-0.996		3.83	14.74	unusual	—
	59.15	0.974	101.8	TNO		-0.225		1.55	116.75	—	—
	958.56	0.991	98.6	TNO		-0.528		8.37	1908.74	—	—
	10.31	0.848	5.9	CEN	—	1.989		1.57	19.05	—	—
	58.04	0.951	97.1	TNO		-0.164		2.82	113.27	unusual	—
	11.99	0.863	72.9	CEN	—	0.883		1.64	22.34	—	—
	5.68	0.466	175.1	CEN		-0.926		3.03	8.33	—	—
	81.49	0.969	154.7	TNO		-1.708		2.54	160.45	unusual	—
	17.05	0.791	15.4	CEN	—	2.442	—	3.57	30.54	unusual	—
	12.58	0.786	130.4	CEN		-0.831		2.69	22.47	unusual	—
	11.01	0.836	11.3	CEN	—	2.039	—	1.81	20.22	—	—
	19.84	0.92	5.2	CEN	—	1.783		1.58	38.1	—	—
	34.03	0.91	14.3	TNO	—	2.206	—	3.06	65	—	—
	8.17	0.752	61.3	CEN	—	1.430		2.03	14.31	unusual	—
	32.9	0.869	170.8	TNO		-2.297		4.31	61.48	—	—
	12.72	0.886	9.6	CEN	—	1.841		1.45	23.99	—	—
	13.47	0.893	4.4	CEN	—	1.831		1.44	25.5	—	—
	8.99	0.854	6.5	CEN	—	1.938		1.31	16.68	—	—
	13.22	0.894	5.6	CEN	—	1.814		1.4	25.03	—	—
	9.24	0.844	9.5	CEN	—	1.971		1.44	17.04	—	—
	10.38	0.842	6.8	CEN	—	2.013	—	1.64	19.12	—	—
	19.98	0.928	8.8	CEN	—	1.708		1.45	38.52	—	—
	13.16	0.889	9.8	CEN	—	1.832		1.46	24.86	—	—
	7	0.291	95.9	CEN		0.514		4.97	9.04	unusual	—
	44.84	0.9	92.4	TNO		0.010		4.5	85.18	unusual	—
	21.37	0.941	93.7	NEO		0.155		1.25	41.48	—	—
	12.18	0.865	15.8	CEN	—	1.903		1.64	22.72	—	—
	8.26	0.76	18.1	CEN	—	2.187	—	1.98	14.53	—	—
	12.33	0.867	9.1	CEN	—	1.937		1.64	23.02	—	—
	18.81	0.918	3.8	CEN	—	1.781		1.54	36.07	—	—
	28.84	0.903	128.6	CEN		-1.078		2.79	54.89	unusual	—
	12.4	0.889	7.1	CEN	—	1.821		1.37	23.43	—	—
	11.6	0.874	1.5	CEN	—	1.898		1.46	21.75	—	—
	22.47	0.72	169.3	CEN		-2.602		6.29	38.64	—	—
	13.86	0.71	171	CEN		-1.895		4.02	23.7	unusual	—
	9.58	0.756	7.4	CEN	—	2.304	—	2.34	16.83	—	—
	8.37	0.841	9.2	CEN	—	1.976		1.33	15.41	—	—
	71.97	0.955	101.5	TNO		-0.368		3.26	140.67	unusual	—
	21.94	0.835	139.9	CEN		-1.491		3.62	40.26	unusual	—
	12.79	0.875	7.1	CEN	—	1.916		1.61	23.97	—	—
	8.66	0.712	94.4	CEN		0.462		2.49	14.83	unusual	—
	9.35	0.808	0.3	CEN	—	2.136	—	1.8	16.91	—	—
	16.73	0.877	8.3	CEN	—	2.013	—	2.05	31.4	—	—
	23.96	0.928	7.2	CEN	—	1.800		1.72	46.2	—	—
	456.59	0.989	156.1	TNO		-2.506		4.96	908.23	unusual	—
	11.98	0.886	8.2	CEN	—	1.828		1.37	22.58	—	—
	80.6	0.966	91.7	TNO		0.002		2.76	158.45	unusual	—
	20.2	0.764	1.6	CEN	—	2.797	—	4.76	35.64	unusual	—
	14.21	0.902	37.9	CEN	—	1.492		1.39	27.03	—	—
	54.15	0.956	91.2	TNO		0.057		2.39	105.91	unusual	—
	14.52	0.882	14.1	CEN	—	1.886		1.72	27.32	—	—
	8.07	0.836	10.5	CEN	—	1.989		1.32	14.82	—	—
	10.93	0.805	13.4	CEN	—	2.150	—	2.13	19.73	—	—
	144.42	0.965	58	TNO	—	1.501		5.05	283.78	unusual	—
	14.47	0.853	159.2	CEN		-1.267		2.13	26.81	unusual	—
	36.44	0.902	157.5	TNO		-1.967		3.57	69.32	unusual	—
	19.35	0.83	118.2	CEN		-0.748		3.28	35.42	unusual	—
	63.07	0.957	22.2	TNO	—	1.945		2.69	123.45	unusual	—
	29.1	0.936	12.2	CEN	—	1.810		1.87	56.32	—	—
	47.63	0.937	129.7	TNO		-1.245		3.01	92.25	unusual	—
	7.2	0.538	167.1	CEN		-1.209		3.32	11.07	unusual	—
	66.61	0.959	171	TNO		-1.922		2.72	130.49	unusual	—
	10.77	0.875	0.6	CEN	—	1.877		1.35	20.19	—	—
	21.02	0.935	14.1	CEN	—	1.633		1.37	40.67	—	—
	23.25	0.938	11.8	CEN	—	1.657		1.44	45.06	—	—
	13.78	0.918	17.2	NEO	—	1.614		1.14	26.42	—	—
	10.72	0.831	10.5	CEN	—	2.054	—	1.81	19.63	—	—
	13.03	0.66	152.3	CEN		-1.706		4.43	21.63	—	—
2016 LS	13.34	0.606	114.3	CEN		-0.660		5.26	21.42	unusual	—
	13.9	0.76	21.9	CEN	—	2.344	—	3.33	24.46	unusual	—
	31.02	0.906	105.2	TNO		-0.373		2.9	59.13	unusual	—
	8.54	0.828	4.9	CEN	—	2.040	—	1.47	15.61	—
	9.2	0.551	92.4	CEN		0.475		4.13	14.27	unusual	—
	7.39	0.554	138.3	CEN		-0.778		3.3	11.49	unusual	—
	35.69	0.948	87.2	TNO	—	0.226		1.85	69.52	—	—
	3.61	0.526	117.8	MBA		0.780		1.71	5.51	—	—
	29.62	0.95	2.3	CEN	—	1.662		1.48	57.77	—	—
	30.39	0.862	11.2	TNO	—	2.576	—	4.2	56.59	—	—
	24.86	0.937	1.4	CEN	—	1.741		1.58	48.14	—	—
	8.47	0.83	2.3	CEN	—	2.036	—	1.44	15.5	—	—
	10.3	0.834	4.6	CEN	—	2.051	—	1.7	18.89	—	—
	11.15	0.85	148.5	CEN		-0.847		1.67	20.62	unusual	—
	14.35	0.882	53	CEN	—	1.304		1.69	27	unusual	—
	10.29	0.81	34.4	CEN	—	1.868		1.96	18.63	—	—
	5.45	0.407	139.8	other		-0.474		3.24	7.67	—	—
	28.69	0.883	137.2	CEN		-1.435		3.35	54.03	unusual	—
	17.57	0.904	19.9	CEN	—	1.776		1.69	33.45	—	—
	186.35	0.984	152.4	TNO		-1.852		2.95	369.75	unusual	—
	24.65	0.946	11.2	CEN	—	1.596		1.33	47.97	—	—
	33.15	0.92	83.4	TNO	—	0.383		2.64	63.66	—	—
	43.25	0.947	74.9	TNO	—	0.603		2.29	84.22	unusual	—
	32.78	0.883	160.9	TNO		-2.063		3.82	61.74	unusual	—
	67.32	0.953	65.8	TNO	—	0.974		3.19	131.45	unusual	—
	1311.87	0.997	55.8	TNO	—	1.475		4.46	2619.28	unusual	—
	14.6	0.622	101.3	CEN		-0.156		5.52	23.67	—	—
	58.9	0.971	94.8	TNO		-0.046		1.73	116.07	unusual	—
	17.38	0.925	71.8	CEN	—	0.733		1.31	33.44	—	—
	34.55	0.857	148.8	TNO		-2.121		4.94	64.16	unusual
	9.02	0.801	5.1	CEN	—	2.147	—	1.79	16.25	—	—
	11.62	0.782	87.1	CEN	—	0.542		2.53	20.71	unusual	—
	9.66	0.792	113.3	CEN		-0.119		2.01	17.3	unusual	—
	239.43	0.992	152.1	TNO		-1.464		1.85	477.02	unusual	—
	34.08	0.954	2.5	TNO	—	1.684		1.56	66.6	—	—
	125.75	0.975	144.2	TNO		-1.729		3.14	248.36	unusual	—
	30.06	0.747	90.5	CEN		0.147		7.61	52.5	—	—
	317.81	0.996	108.3	NEO		-0.416		1.24	634.38	—	—
	8.92	0.766	27.9	CEN	—	2.072	—	2.09	15.76	unusual	—
	152.42	0.972	89	TNO	—	0.080		4.26	300.57	unusual	—
	12.93	0.872	63	CEN	—	1.105		1.66	24.21	—	—
	32	0.925	81.3	TNO	—	0.446		2.39	61.62	unusual	—
	95.81	0.983	68.2	TNO	—	0.635		1.6	190.02	—	—
	93.93	0.961	46.9	TNO	—	1.672		3.71	184.15	unusual	—
	370.07	0.99	68.3	TNO	—	0.909		3.83	736.31	unusual	—
	8.95	0.808	1.2	CEN	—	2.127	—	1.72	16.19	—	—
	19.51	0.862	74.1	CEN	—	0.804		2.69	36.33	unusual	—
	154.08	0.981	91	TNO		-0.002		2.97	305.19	unusual	—
	8.15	0.788	170.9	CEN		-0.881		1.72	14.57	unusual	—
A/2018 V3	121.44	0.989	165	TNO		-1.339		1.34	241.54	—	—
	7.25	0.694	152.3	CEN		-0.787		2.22	12.27	unusual	—
(594872) 2019 CR	14.46	0.594	160.3	CEN		-2.166		5.87	23.04	—
	24.2	0.956	139.6	NEO		-0.754		1.08	47.32	—	—
A/2019 G2	699.85	0.997	159.2	TNO		-1.746		2.29	1397.41	—	—
A/2019 G3	17.15	0.834	156.8	CEN		-1.540		2.85	31.45	—	—
	8.79	0.555	134.3	CEN		-0.918		3.91	13.66	unusual	—
	11.67	0.702	108.3	CEN		-0.224		3.48	19.86	unusual	—
	12.42	0.765	14.8	CEN	—	2.342	—	2.91	21.93	—	—
A/2019 O2	57.37	0.831	93.3	TNO		-0.121		9.68	105.05	—	—
A/2019 O4	32.88	0.889	115.1	TNO		-0.817		3.64	62.12	—	—
	25.11	0.92	113	CEN		-0.465		2.01	48.22	unusual	—
A/2019 Q2	59.68	0.979	159	NEO		-1.205		1.26	118.11	—	—
A/2019 T1	38.24	0.888	120.9	TNO		-1.143		4.28	72.2	—	—
	37.39	0.931	22	TNO	—	1.948		2.56	72.22	unusual	—
A/2020 A1	25.94	0.936	149	CEN		-1.152		1.67	50.2	—	—
A/2020 B1	52.32	0.967	18.5	TNO	—	1.641		1.75	102.88	—	—
	7.69	0.922	165.5	NEO		-0.237		0.6	14.79	—	—
2020 EP	10.5	0.764	76.4	CEN	—	0.927		2.48	18.51	unusual	—
	14.4	0.773	28.6	CEN	—	2.216	—	3.27	25.52	unusual	—
A/2020 H9	341.71	0.992	137.9	TNO		-1.458		2.58	680.84	—	—
	16.6	0.709	147.3	CEN		-1.808		4.84	28.36	unusual	—
	13.07	0.872	38.7	CEN	—	1.612		1.68	24.47	unusual	—
	7.94	0.502	106.1	CEN		0.061		3.95	11.94	unusual	—
	34.88	0.88	103.8	TNO		-0.440		4.2	65.57	unusual	—
	56.08	0.955	82.5	TNO	—	0.349		2.54	109.62	unusual	—
A/2020 M4	5092.51	0.999	160.1	TNO		-2.843		5.95	10179.07	—	—
	6.24	0.376	166.6	CEN		-1.139		3.89	8.58	unusual	—
	6.9	0.684	155.8	CEN		-0.779		2.18	11.63	unusual	—
	28.37	0.894	79.5	CEN	—	0.565		3	53.75	unusual	—
	674.79	0.993	76.8	TNO	—	0.627		4.82	1344.75	unusual	—
	19.13	0.875	80.5	CEN	—	0.579		2.39	35.88	—	—
	18.18	0.856	77.4	CEN	—	0.709		2.62	33.74	unusual	—
	17.52	0.884	5.7	CEN	—	2.003	—	2.03	33.02	unusual	—
	20.44	0.878	105.6	CEN		-0.254		2.49	38.4	unusual	—
	7.73	0.773	161.2	CEN		-0.791		1.75	13.71	unusual	—
	23.54	0.918	32.5	CEN	—	1.647		1.94	45.14	—	—
	501.83	0.967	169.3	TNO		-4.896		16.49	987.16	—	—
	7.6	0.435	160.4	CEN		-1.366		4.29	10.91	unusual	—
	35.41	0.889	148.6	TNO		-1.892		3.93	66.88	unusual	—
	22.12	0.82	10.8	CEN	—	2.555	—	3.99	40.25	unusual	—
A/2021 E2	216.27	0.989	167.5	TNO		-1.802		2.29	430.26	—	—
A/2021 E4	733.1	0.994	116.4	TNO		-1.181		4.68	1461.53	—	—
	10.81	0.792	54.9	CEN	—	1.492		2.24	19.37	—	—
	86.21	0.96	125.1	TNO		-1.252		3.46	168.96	unusual	—
	24.64	0.944	2.3	CEN	—	1.652		1.39	47.89	—	—
	25.64	0.869	129	CEN		-1.179		3.36	47.92	—	—
	8.412	0.5885	63.78	CEN	—	1.53		3.461	13.36	unusual	—
	6.322	0.6159	71.35	CEN	—	1.38		2.428	10.22	unusual	—
	321.1	0.9859	84.79	TNO	—	0.255		4.524	637.62	unusual	—
	105.8	0.9619	103.18	TNO		-0.513		4.025	207.49	unusual	—
Designation	a (AU)	e	i (°)	Orbital criteria and classes				q (AU)	Q (AU)	Unusual	Catalog	Refs
Designation	a (AU)	e	i (°)	Cls	Retro	T_Jupiter	T_J ≤ 2	q (AU)	Q (AU)	Unusual	Catalog	Refs

External links

A first look at the Damocloids, David Jewitt, January 2005
Damocloid family, David J. Darling

Damocloid Explained

Origin

List

See also

External links