Asteroids/TNOs with satellites: summary data

Asteroids/TNOs with Satellites: Summary Data
compiled by Wm. Robert Johnston
last updated 29 June 2009

(listed by increasing mean distance from Sun)

minor planet and companion	type	Primary					Secondary
minor planet and companion	type	semimajor axis (AU)	orbital period (yr)	eccentricity	diameter (km)	rotation period (hours)	semimajor axis (km)	orbital period (days)	diameter (km)	discovery method	discovery date	announcement date

(66391) 1999 KW4	NEA	0.642	0.515	0.688	1.317	2.765	2.548	0.7259	0.45	LC/R	21 May 2001	23 May 2001
(137170) 1999 HF1	NEA	0.819	0.741	0.462	3.7	2.319	7.0	0.584	0.75	LC	23 Apr 1999	1999
1998 ST27	NEA	0.819	0.742	0.530	0.8	<3.0	4.5?	4?	0.12	R	7 Oct 2001	9 Oct 2001
(162483) 2000 PJ5	NEA	0.873	0.815	0.374	0.6?	2.642	1.05	0.59	0.3?	LC	10 Jul 2005	Feb 2008
(5381) Sekhmet	NEA	0.947	0.922	0.296	1.0	2.7	1.54	0.5208	0.3	R	8 May 2003	6 Jul 2003
(66063) 1998 RO1	NEA	0.991	0.986	0.720	0.8	2.492	[1.3?]	0.6058	0.38	LC	13 Sep 2002	21 Oct 2002
(175706) 1996 FG3	NEA	1.054	1.082	0.350	1.5	3.594	2.4	0.6723	0.46	LC	10 Dec 1998	26 Dec 1998
(88710) 2001 SL9	NEA	1.061	1.093	0.270	0.8	2.400	[1.4?]	0.6833	0.22	LC	2 Oct 2001	3 Nov 2001
1994 AW1	NEA	1.105	1.161	0.075	1.0	2.519	[2.2?]	0.9304	0.5	LC	Jan 1994	1994
(164121) 2003 YT1	NEA	1.110	1.169	0.292	1.1	2.343	[3.5?]	1.529	0.21	LC/R	6 May 2004	6 May 2004
(35107) 1991 VH S/2008 (35107) 1	NEA	1.137	1.213	0.144	1.2	2.624	3.2	1.360	0.5	LC	27 Feb 1997	29 Mar 1997
(185851) 2000 DP107 S/2000 (2000 DP107) 1	NEA	1.365	1.596	0.377	0.8	2.775	2.62	1.760	0.3	R	22 Sep 2000	3 Oct 2000
(1862) Apollo	NEA	1.470	1.782	0.560	1.6	3.065	3	[0.8]	0.08	R	29 Oct 2005	4 Nov 2005
2004 DC	NEA	1.634	2.088	0.400	0.3	2?	[0.6?]	0.9583	0.06	R	2 Jun 2006	2 Jun 2006
(136617) 1994 CC	NEA	1.639	2.098	0.418	0.65	2.389	? ?	? ?	0.05 0.10	R R	Jun 2009 Jun 2009	19 Jun 2009 19 Jun 2009
(65803) Didymos	NEA	1.644	2.109	0.384	0.75	2.259	1.05	0.4963	0.16	LC	20 Nov 2003	28 Nov 2003
(69230) Hermes	NEA	1.656	2.131	0.624	0.6	13.894	[1.1?]	0.5789	0.54	R	18 Oct 2003	20 Oct 2003
(162000) 1990 OS	NEA	1.678	2.174	0.462	0.3	?	>0.6	0.88	0.045	R	5 Nov 2003	10 Nov 2003
(3309) Brorfelde	MB	1.818	2.451	0.053	[5?]	2.504	[10?]	0.770	[1.4?]	LC	25 Oct 2005	7 Nov 2005
2002 BM26	NEA	1.832	2.480	0.445	0.6	2.7	[1.4]	1.075	0.1	R	9 Feb 2002	11 Feb 2002
(5407) 1992 AX	MCA	1.838	2.492	0.277	3.9	2.549	[5.9?]	0.5633	0.78	LC	7 Jan 1997	1997
(85938) 1999 DJ4	NEA	1.853	2.522	0.483	0.35	2.514	[0.65]	0.7388	0.17	LC	21 Feb 2004	23 Apr 2004
2006 GY2	NEA	1.857	2.531	0.495	0.4	2.27	[0.5]	0.488	0.08	R	15 May 2006	2 Jun 2006
(4674) Pauling S/2004 (4674) 1	MB	1.859	2.534	0.071	8	2.531	250?	[50?]	2.5	AOT	4 Mar 2004	5 Mar 2004
(1509) Esclangona S/2003 (1509) 1	MB	1.867	2.550	0.032	8.2	3.247	140?	[20?]	2.7	AOT	13 Feb 2003	18 Feb 2003
(3169) Ostro	MB	1.892	2.602	0.067	3.6	6.509	4.8?	0.2712	3.1	LC	5 Nov 2005	20 Dec 2005
(1866) Sisyphus	NEA	1.894	2.606	0.539	8.5	2.700	?	?	?	R	Dec 1985	Dec 2007
(1453) Fennia	MB	1.897	2.613	0.028	7.2	4.412	[16?]	0.9579	2	LC	4 Nov 2007	1 Dec 2007
(2577) Litva	MCA	1.904	2.628	0.138	[9?]	2.814	[18?]	1.491	[2.5?]	LC	28 Feb 2009	11 Mar 2009
(5905) Johnson	MB	1.910	2.640	0.072	5	3.782	[11?]	0.9077	2	LC	1 Apr 2005	13 Apr 2005
(9069) Hovland	MB	1.913	2.646	0.118	3	4.218	[8?]	1.264	0.9	LC	Oct 2004	16 Nov 2004
(5477) 1989 UH2	MB	1.917	2.655	0.075	[6?]	2.994	[15?]	1.018	[2.4?]	LC	2 Nov 2005	15 Nov 2005
2000 UG11	NEA	1.928	2.678	0.573	0.26	4.44?	0.426	0.768	0.13	R	3 Nov 2000	10 Nov 2000
(76818) 2000 RG79	MB	1.930	2.681	0.096	3.6	3.166	[6?]	0.5885	1.3	LC	Aug 2005	30 Aug 2005
2003 SS84	NEA	1.931	2.683	0.570	0.12	?	[0.3?]	1	0.06	R	4 Oct 2003	10 Oct 2003
(1139) Atami	MCA	1.948	2.718	0.255	6	27.45	[15?]	1.144	5	LC	< Sep 2005	1 Sep 2005
2002 KK8	NEA	1.957	2.737	0.466	0.5	?	?	?	0.1	R	8 Jun 2002	17 Jun 2002
(7088) Ishtar	NEA	1.981	2.787	0.391	[1.4?]	2.679	[3?]	0.860	[0.6?]	LC	4 Dec 2005	31 Jan 2006
(153591) 2001 SN263	NEA	1.988	2.804	0.478	2.8	3.434	4 17	1.921 6.1	0.5 1.2	R R	12 Feb 2008 12 Feb 2008	12 Feb 2008 12 Feb 2008
(31345) 1998 PG	NEA	2.015	2.860	0.392	0.9	2.516	[1.4?]	0.5835	0.3	LC	29 Aug 1998	1998
2005 NB7	NEA	2.045	2.925	0.517	0.5	3.488	>0.6	0.6367	0.2	R	11 Apr 2008	17 Apr 2008
(6244) Okamoto	MB	2.160	3.174	0.153	[6?]	2.896	[12?]	0.8467	[1.5?]	LC	26 Sep 2006	19 Oct 2006
(6265) 1985 TW3	MB	2.166	3.189	0.193	[6?]	2.709	[11?]	0.6608	[1.5?]	LC	15 Jul 2007	2 Aug 2007
(6615) Plutarchos	MB	2.169	3.195	0.127	[5?]	2.325	[16?]	1.668	?	LC	14 Apr 2007	Oct 2007
(1830) Pogson	MB	2.188	3.237	0.057	[10?]	2.570	[23?]	1.010	[3?]	LC	18 Apr 2007	10 May 2007
(32008) 2000 HM53	MB	2.192	3.246	0.193	[5?]	3.017	[17?]	1.677	[2?]	LC	5 Aug 2007	20 Sep 2007
(1717) Arlon	MB	2.196	3.254	0.129	[9?]	5.148	[16?]	0.7598	?	LC	4 Dec 2005	17 Jan 2006
(11116) 1996 EK	MB	2.197	3.256	0.226	[5?]	4.402	[15?]	2.14?	?	LC	4 Jun 2006	Apr 2009
(3671) Dionysus S/1997 (3671) 1	NEA	2.198	3.260	0.542	1.5	2.705	3.6	1.155	0.3	LC	30 May 1997	10 Jun 1997
(17260) 2000 JQ58	MB	2.204	3.272	0.184	[5?]	3.129	[8?]	0.6149	[1.3?]	LC	29 Jan 2006	14 Mar 2006
2007 DT103	NEA	2.209	3.282	0.574	0.3	2.703	0.45?	[0.6?]	0.08	R	26 Jul 2007	3 Aug 2007
(1089) Tama	MB	2.215	3.296	0.127	10.6	16.444	10?	0.6852	7.3	LC	24 Dec 2003	12 Jan 2004
2008 BT18	NEA	2.217	3.301	0.597	0.6	2.57	1.5?	[1?]	0.2	R	6 Jul 2008	29 Jul 2008
(32039) 2000 JO23	MCA	2.224	3.316	0.282	[3?]	6.598	[40?]	15?	[1.8?]	LC	3 Sep 2007	23 Nov 2007
(9617) Grahamchapman	MB	2.224	3.318	0.113	[5?]	2.286	[9?]	0.8077	[1.3?]	LC	27 Jan 2006	1 Mar 2006
(2478) Tokai	MB	2.225	3.320	0.068	[7?]	25.885	[19?]	1.079	[5?]	LC	20 Jan 2007	30 Jan 2007
(2754) Efimov	MB	2.227	3.324	0.233	[6?]	2.450	[10?]	0.6152	[1.3?]	LC	14 Aug 2006	4 Sep 2006
2002 CE26	NEA	2.234	3.339	0.559	3.46	3.293	4.7	0.65	0.3	R	30 Aug 2004	4 Sep 2004
(10208) 1997 QN1	MB	2.236	3.343	0.201	[3.6?]	3.348	[15?]	2.44	[1.7?]	LC	6 Aug 2007	25 Sep 2007
(3749) Balam -- S/2002 (3749) 1	MB	2.237	3.345	0.110	6	2.805	20 289	1.391 61	2.5 2.8	LC AOT	15 Jul 2007 8 Feb 2002	12 Mar 2008 13 Feb 2002
(3073) Kursk	MB	2.244	3.361	0.136	[6?]	3.447	[22?]	1.873	[1.6?]	LC	11 Dec 2006	3 Jan 2007
(939) Isberga	MB	2.247	3.369	0.177	[12?]	2.917	[30?]	1.117	?	LC	26 Feb 2006	2007
(8116) Jeanperrin	MB	2.250	3.375	0.159	[5?]	3.617	[16?]	1.506	[2?]	LC	4 Oct 2007	9 Nov 2007
(34706) 2001 OP83	MCA	2.253	3.381	0.383	[4?]	2.594	[7?]	0.865	[1?]	LC	11 Dec 2005	29 Dec 2005
(114319) 2002 XD58	MCA	2.257	3.390	0.274	[2.6?]	7.954	?	?	?	LC	25 Aug 2005	23 Dec 2005
(4951) Iwamoto	MB	2.258	3.393	0.166	4	118.0	[30?]	4.917	3.5	LC	11 May 2007	11 May 2007
(3982) Kastel	MB	2.259	3.395	0.219	[8?]	8.488	[10?]	0.354	?	LC	24 Sep 2005	1 Oct 2005
(1338) Duponta	MB	2.264	3.407	0.112	[11?]	3.855	[20?]	0.7321	[2.6?]	LC	6 Mar 2007	27 Mar 2007
(4607) Seilandfarm	MB	2.264	3.407	0.020	[10?]	4.01	[23?]	1.318	[3?]	LC	17 Jan 2009	11 Mar 2009
(2486) Metsahovi	MB	2.269	3.418	0.079	[11?]	4.45?	?	?	?	LC	12 Dec 2006	26 Feb 2007
(809) Lundia	MB	2.283	3.449	0.192	6	15.4	[12?]	0.6417	6	LC	18 Sep 2005	1 Oct 2005
(9260) Edwardolson	MB	2.290	3.465	0.230	[4?]	3.085	[7?]	0.741	[1?]	LC	6 Oct 2005	2 Nov 2005
(16635) 1993 QO	MCA	2.298	3.484	0.284	[5?]	7.622	[14?]	1.344	[1.4?]	LC	2 Sep 2007	19 Nov 2007
(6084) Bascom	MB	2.313	3.518	0.235	[8?]	2.745	[28?]	1.813	[3?]	LC	29 Dec 2005	6 Feb 2006
(2006) Polonskaya	MB	2.324	3.544	0.192	[10?]	3.118	[18?]	0.7979	[2.1?]	LC	1 Nov 2005	16 Nov 2005
(3703) Volkonskaya	MB	2.332	3.561	0.134	3	3.235	[7?]	1?	1.2	LC	2005	Dec 2005
(3868) Mednoza	MB	2.333	3.565	0.099	[9?]	2.771	?	?	?	LC	2009	6 Jun 2009
(7225) Huntress	MB	2.340	3.579	0.205	[7?]	2.440	[11?]	0.6113	[1.5?]	LC	7 Dec 2007	31 Jan 2008
(5481) Kiuchi	MB	2.340	3.579	0.062	[8?]	3.620	[16?]	0.8708	[2.6?]	LC	13 Mar 2008	15 Apr 2008
(3673) Levy	MB	2.345	3.590	0.185	[8?]	2.688	[17?]	0.903	[2.2?]	LC	5 Dec 2007	12 Dec 2007
1994 XD	NEA	2.349	3.600	0.733	0.6	?	0.6?	[0.3?]	>0.15	R	24 Jun 2005	11 Jul 2005
(4786) Tatianina	MB	2.359	3.623	0.192	[7?]	2.923	[15?]	0.9029	[1.4?]	LC	20 Mar 2006	11 Apr 2006
(15268) Wendelinefroger	MB	2.366	3.640	0.234	[5?]	2.422	[10?]	1.045	[1.2?]	LC	24 Sep 2008	20 Oct 2008
(854) Frostia	MB	2.368	3.644	0.174	14	37.728	17?	1.572	10	LC	17 Jul 2004	Aug 2004
(2044) Wirt	MCA	2.381	3.673	0.343	6.7	3.689	[13?]	0.7904	1.7	LC	8 Dec 2005	6 Jan 2006
2006 VV2	NEA	2.389	3.694	0.604	1.8	2.41	>1.5	[0.23?]	>0.3	R	27 Mar 2007	5 Apr 2007
(3782) Celle	MB	2.415	3.752	0.095	6	3.839	[20?]	1.524	2.6	LC	18 Sep 2001	3 May 2003
(6708) Bobbievaile	MB	2.445	3.823	0.182	[8?]	8.221	[16?]	1.03	[4.5?]	LC	16 Apr 2009	7 May 2009
(4029) Bridges	MB	2.525	4.013	0.132	[8?]	3.575	[14?]	0.6796	[2?]	LC	11 Apr 2006	8 May 2006
(11264) Claudiomaccone	MB	2.579	4.142	0.233	4	3.187	6?	0.6296	>1.2	LC	4 Nov 2005	Dec 2005
(1333) Cevenola	MB	2.634	4.275	0.133	17	4.88	?	?	?	LC	2008	12 Oct 2008
(1313) Berna	MB	2.657	4.330	0.208	15?	25.464	17	1.061	12?	LC	6 Feb 2004	23 Feb 2004
(45) Eugenia S/2004 (45) 1 Petit-Prince	MB	2.721	4.488	0.082	215	5.699	[540?] 1,180	[1.5?] 4.765	6 7	AOT AOT	14 Feb 2004 1 Nov 1998	7 Mar 2007 20 Mar 1999
(41) Daphne S/2008 (41) 1	MB	2.766	4.600	0.272	174	5.988	[440?]	1.6?	<2	AOT	28 Mar 2008	31 Mar 2008
(4492) Debussy	MB	2.767	4.602	0.180	10?	26.606	9?	1.109	6.5?	LC	30 Oct 2002	15 Jun 2004
(216) Kleopatra S/2008 (216) 1 S/2008 (216) 2	MB	2.796	4.675	0.248	217x97x81	5.385	[380?] [650?]	[1.4?] [3?]	3? 5?	AOT AOT	19 Sep 2008 19 Sep 2008	24 Sep 2008 24 Sep 2008
(17246) 2000 GL74 S/2004 (17246) 1	MB	2.840	4.786	0.020	4.5	?	230?	90?	2	HST	14 Jan 2004	24 Feb 2004
(22899) 1999 TO14 S/2003 (22899) 1	MB	2.844	4.795	0.082	4.5	?	170?	56?	1.5	HST	26 Jul 2003	26 Oct 2003
(243) Ida Dactyl	MB	2.863	4.844	0.045	60x25x19	4.634	108	1.54	1.6x1.4x1.2	SP	28 Aug 1993	12 Mar 1994
(22) Kalliope Linus	MB	2.908	4.958	0.103	181	4.148	1,095	3.596	26	AOT	29 Aug 2001	3 Sep 2001
(283) Emma S/2003 (283) 1	MB	3.046	5.315	0.150	148	6.888	581	3.353	9	AOT	14 Jul 2003	27 Jul 2003
(130) Elektra S/2003 (130) 1	MB	3.122	5.515	0.209	182	5.225	1,318	5.258	7	AOT	15 Aug 2003	17 Aug 2003
(379) Huenna S/2003 (379) 1	MB	3.133	5.547	0.188	92	7.022	3,340	87.6	5.8	AOT	14 Aug 2003	15 Aug 2003
(762) Pulcova	MB	3.155	5.603	0.101	137	5.839	703	4.438	19	AOT	22 Feb 2000	24 Oct 2000
(90) Antiope S/2000 (90) 1	MB	3.157	5.610	0.157	88	16.505	171	0.6877	84	AOT	10 Aug 2000	3 Oct 2000
(702) Alauda S/2007 (702) 1	MB	3.192	5.704	0.022	195	8.354	[900?]	[3?]	6	AOT	26 Jul 2007	2 Aug 2007
2005 AB	NEA	3.219	5.775	0.655	1.2	3.339	~3.5	0.7471	0.46	LC	Feb 2005	11 Feb 2005
(121) Hermione S/2002 (121) 1	MB	3.444	6.391	0.135	240x150	5.551	747	2.563	32	AOT	28 Sep 2002	30 Sep 2002
(107) Camilla S/2001 (107) 1	MB	3.475	6.479	0.078	223	4.844	1,250	3.722	16	HST	1 Mar 2001	19 Mar 2001
(87) Sylvia Remus Romulus	MB	3.486	6.508	0.081	286	5.184	706 1,356	1.379 3.650	7 18	AOT AOT	9 Aug 2004 18 Feb 2001	11 Aug 2005 23 Feb 2001
(617) Patroclus Menoetius	JTA	5.223	11.938	0.139	122	101	680	4.283	113	AOT	22 Sep 2001	29 Oct 2001
(624) Hektor S/2006 (624) 1	JTA	5.234	11.975	0.022	363x207	6.921	[1,200?]	[3?]	15	AOT	16 Jul 2006	21 Jul 2006
(29314) 1994 CR18	JTA	5.249	12.026	0.073	32	15.035	[42?]	0.6265	24	LC	Apr 2005	Sep 2007
(17365) 1978 VF11	JTA	5.267	12.087	0.078	92	12.672	[120?]	0.528	77	LC	Apr 2005	Sep 2007
(42355) Typhon Echidna	TNO	37.681	231.3	0.535	152	4.35?	1,628	18.971	84	HST	20 Jan 2006	15 Feb 2006
1999 OJ4	TNO	38.222	236.3	0.025	75	?	3,267	84.12	72	HST	4 Oct 2002	6 Oct 2005
1998 WV24	TNO	38.940	243.0	0.040	100?	?	[1,400?]	[16?]	87?	HST	27 Aug 2007	29 Oct 2008
(90482) Orcus	TNO	39.181	245.3	0.226	901	13.188	[8,700?]	[11?]	288	HST	13 Nov 2005	27 Feb 2007
2007 TY430	TNO	39.315	246.5	0.265	144?	?	[13,000?]	[360?]	141?	AOT	14 Oct 2007	1 Aug 2008
(208996) 2003 AZ84	TNO	39.354	246.9	0.182	682	13.44	[7,200?]	[13?]	68	HST	2 Dec 2005	22 Feb 2007
(139775) 2001 QG298	TNO	39.529	248.5	0.196	135	13.774	[170?]	0.5739	117	LC	2004	12 Feb 2004
(47171) 1999 TC36 S/2001 (1999 TC36) 1	TNO	39.548	248.7	0.227	388	6.21	7,640	50.38	145	HST	8 Dec 2001	10 Jan 2002
(134340) Pluto Charon Nix Hydra	TNO*	39.743	250.5	0.252	2369	153.294	19,570 49,240 65,080	6.387 25.49 38.73	1212 66? 62?	IMG HST HST	22 Jun 1978 15 May 2005 15 May 2005	7 Jul 1978 31 Oct 2005 31 Oct 2005
(80806) 2000 CM105	TNO	42.022	272.4	0.066	205?	?	[2,700?]	[15?]	156?	HST	5 Oct 2002	6 Oct 2005
(120347) 2004 SB60	TNO	42.216	274.3	0.106	595?	?	[3,300?]	[5?]	216?	HST	21 Jul 2006	19 Sep 2006
2003 UN284	TNO	42.572	277.8	0.004	148	?	[64,000?]	[1,700?]	110	IMG	24 Oct 2003	5 Dec 2003
(55637) 2002 UX25	TNO	42.717	279.2	0.140	649	14.38?	[5,000?]	[8?]	208	HST	26 Aug 2005	22 Feb 2007
1999 RT214	TNO	42.784	279.9	0.052	100?	?	[3,300?]	[60?]	69?	HST	25 Jul 2006	29 Sep 2006
2001 XR254	TNO	42.801	280.0	0.036	169	?	9,270	125.6	140	HST	20 Dec 2006	14 Mar 2007
2003 QY90	TNO	42.975	281.7	0.047	111	3.4	14,200	444	89	IMG	23 Oct 2003	29 Oct 2003
(134860) 2000 OJ67	TNO	43.077	282.7	0.023	138	?	2,357	22.041	108	HST	25 Jun 2003	6 Oct 2005
(136108) Haumea Namaka Hi'iaka	TNO	43.109	283.0	0.196	1960x1520x1000?	3.915	25,660 49,900	18.278 49.46	160? 320?	AOT AOT	30 Jun 2005 26 Jan 2005	7 Nov 2005 29 Jul 2005
(160256) 2002 PD149	TNO	43.131	283.3	0.057	214?	?	[24,000?]	[380?]	177?	HST	22 May 2007	31 Aug 2007
(50000) Quaoar	TNO	43.554	287.4	0.039	842	17.679	[11,000?]	[19?]	64	HST	14 Feb 2006	22 Feb 2007
2000 CF105	TNO	43.682	288.7	0.033	170	?	[23,000?]	[600?]	120	HST	12 Jan 2002	22 Mar 2002
(79360) 1997 CS29	TNO	43.696	288.8	0.009	299?	?	[2,300?]	[6?]	287?	HST	22 Oct 2002	6 Oct 2005
2002 XH91	TNO	43.774	289.6	0.092	334?	?	?	?	?	?		27 May 2009
(119067) 2001 KP76	TNO	43.787	289.8	0.192	153?	?	[8,900?]	[130?]	145?	HST	8 May 2007	19 Feb 2008
2003 QW111	TNO	43.912	291.0	0.110	196?	?	[10,400?]	[140?]	100?	HST	25 Jul 2006	7 Sep 2006
2003 WU188	TNO	43.986	291.7	0.039	259?	?	[1,300?]	[4?]	186?	?	< Mar 2007	14 Mar 2007
2001 FL185	TNO	44.011	292.0	0.072	144?	?	[1,900?]	[16?]	99?	HST	< Mar 2007	14 Mar 2007
(66652) Borasisi	TNO	44.048	292.3	0.093	166?	?	4,660	46.26	137	HST	23 Apr 2003	6 Jun 2003
2001 QY297	TNO	44.117	293.0	0.085	242?	?	[2,800?]	[12?]	198?	?	< Mar 2007	14 Mar 2007
2001 RZ143	TNO	44.141	293.3	0.065	162?	?	[1,400?]	[7?]	154?	?	< Mar 2007	14 Mar 2007
2001 QQ322	TNO	44.183	293.7	0.052	205?	?	[4,000?]	[25?]	187?	HST	15 Jun 2007	4 Mar 2008
(148780) Altjira	TNO	44.208	293.9	0.064	292?	?	[5,800?]	[29?]	210?	?	< Mar 2007	14 Mar 2007
(88611) Teharonhiawako Sawiskera	TNO	44.269	294.5	0.023	176	9.505?	27,300	825	122	IMG	11 Oct 2001	15 Oct 2001
(123509) 2000 WK183	TNO	44.278	294.6	0.042	178?	?	[2,500?]	[16?]	147?	HST	24 Nov 2005	21 Feb 2007
2001 QW322	TNO	44.282	294.7	0.023	108	?	120,000	9,900	108?	IMG	24 Aug 2001	9 Nov 2001
2003 TJ58	TNO	44.297	294.8	0.086	65	?	3,770	137.3	51	HST	22 Nov 2006	14 Mar 2007
2005 PR21	TNO	44.410	295.9	0.107	238?	?	[3,700?]	[22?]	143?	HST	20 May 2007	4 Mar 2008
1998 WW31 S/2000 (1998 WW31) 1	TNO	44.605	297.9	0.089	148	?	22,300	574	123	IMG	22 Dec 2000	16 Apr 2001
2003 QA91	TNO	44.631	298.2	0.067	253?	?	[1,800?]	[5?]	241?	?	< Mar 2007	14 Mar 2007
(58534) Logos Zoe	TNO	45.055	302.4	0.116	80	?	8,010	312	66	HST	17 Nov 2001	11 Feb 2002
2004 PB108	TNO	45.286	304.8	0.107	241	?	10,480	97.05	131	HST	4 Aug 2006	3 Mar 2007
(160091) 2000 OL67	TNO	45.343	305.3	0.113	168?	?	[7,800?]	[100?]	127?	HST	26 Jun 2007	19 Feb 2008
2005 EO304	TNO	45.621	308.1	0.069	220	?	[87,000?]	[7,400?]	125?	IMG	15 Apr 2005	10 Mar 2005
2002 VF130	TNO	45.729	309.2	0.117	126?	?	[22,000?]	[700?]	110?	HST	3 Nov 2008	3 May 2009
2000 CQ114	TNO	45.953	311.5	0.112	170?	?	[5,900?]	[60?]	109?	HST	6 Jun 2003	16 Feb 2004
2001 QC298	TNO	46.504	317.1	0.128	199?	?	3,690	19.23	155?	HST	4 Oct 2002	17 Dec 2002
2003 QR91	TNO	46.919	321.4	0.188	171?	?	[1,700?]	[9?]	171?	?	< Mar 2007	14 Mar 2007
(119979) 2002 WC19	TNO	47.681	329.2	0.259	400?	?	[2,800?]	[7?]	127?	HST	5 Nov 2006	27 Feb 2007
(26308) 1998 SM165 S/2001 (26308) 1	TNO	47.869	331.2	0.374	280	8.4	11,310	130.1	96	HST	22 Dec 2001	24 Jan 2002
2000 QL251	TNO	48.031	332.9	0.221	148	?	5,000	56.45	143	HST	25 Jul 2006	12 Sep 2006
(182933) 2002 GZ31	TNO	50.697	361.0	0.245	205?	?	[2,100?]	[11?]	129?	HST	23 Apr 2006	28 Feb 2007
(48639) 1995 TL8	TNO	52.635	381.9	0.240	355?	?	[420?]	[0.5?]	161?	HST	9 Nov 2002	6 Oct 2005
(60621) 2000 FE8	TNO	55.252	410.7	0.401	152?	?	[1,200?]	[7?]	115?	HST	15 Jan 2007	3 Mar 2007
(82075) 2000 YW134	TNO	57.541	436.5	0.286	431?	?	[1,900?]	[3?]	237?	HST	25 Oct 2002	6 Oct 2005
(60458) 2000 CM114	TNO	59.239	455.9	0.402	151?	?	[2,200?]	[18?]	119?	HST	16 Jan 2006	18 Mar 2006
2006 SF369	TNO	62.674	496.2	0.377	144?	?	[3,100?]	[28?]	142?	HST	13 Nov 2007	19 Feb 2008
(136199) Eris Dysnomia	TNO*	67.927	559.8	0.436	2600	25.9?	37,400	15.772	400?	AOT	10 Sep 2005	2 Oct 2005
(65489) Ceto Phorcys	TNO	100.418	1,006.3	0.822	183	4.43	1,840	9.554	134	HST	11 Apr 2006	Aug 2006

Notes: figures in brackets are derived based on various assumptions (may involve assumed albedoes, densities, or correspondence of observed separation to semimajor axis). See individual object pages for sources. Types include:

MB = main belt asteroid
MCA = Mars crossing asteroid
NEA = near-Earth asteroid
JTA = Jupiter Trojan asteroid
TNO = trans-Neptunian object
* = dwarf planet

Detection method for secondaries:

AOT = direct imaging, adaptive optics telescope
HST = direct imaging, Hubble Space Telescope
IMG = direct imaging, other ground based telescope
LC = photometric light curve
OCC = stellar occultation
R = radar
SP = direct imaging by space probe

Other reports of asteroid/TNO companions

© 2001-2008, 2009 by Wm. Robert Johnston.
Last modified 29 June 2009.
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