Asteroids/TNOs with satellites: summary data

Asteroids/TNOs with Satellites: Summary Data
compiled by Wm. Robert Johnston
last updated 25 September 2008

(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 date

(66391) 1999 KW4	NEA	0.642	0.515	0.688	1.2	2.765	2.6	0.758	>0.36	21 May 2001
(137170) 1999 HF1	NEA	0.819	0.741	0.463	3.5	2.319	7.0	0.584	0.8	23 Apr 1999
1998 ST27	NEA	0.819	0.742	0.530	0.8	<3.1	4.5?	4?	0.12	7 Oct 2001
(162483) 2000 PJ5	NEA	0.873	0.374	0.815	0.55?	2.642	1.05	0.59	0.28?	10 Jul 2005
(5381) Sekhmet	NEA	0.947	0.922	0.296	1.0	2.7	1.5	0.521	0.3	8 May 2003
(66063) 1998 RO1	NEA	0.991	0.987	0.720	0.9	2.492	0.8?	0.605	>0.36	13 Sep 2002
(175706) 1996 FG3	NEA	1.054	1.082	0.350	1.4	3.594	2.4	0.672	0.43	10 Dec 1998
(88710) 2001 SL9	NEA	1.061	1.093	0.270	1.0	2.400	1.8	0.683	0.31	2 Oct 2001
1994 AW1	NEA	1.105	1.161	0.075	0.9	2.519	2.1	0.933	0.5	Jan 1994
(164121) 2003 YT1	NEA	1.110	1.169	0.292	1.06	2.343	3.4	1.53	0.19	6 May 2004
(35107) 1991 VH S/2008 (35107) 1	NEA	1.136	1.211	0.144	1.2	2.624	3.2	1.362	0.5	27 Feb 1997
(185851) 2000 DP107 S/2000 (2000 DP107) 1	NEA	1.366	1.597	0.377	0.8	2.776	2.6	1.760	0.3	22 Sep 2000
(1862) Apollo	NEA	1.471	1.785	0.560	1.6	3.066	3	[0.7?]	0.08	29 Oct 2005
2004 DC	NEA	1.636	2.090	0.400	0.3	2?	>0.6	0.96	0.06	Jun 2006
(65803) Didymos	NEA	1.644	2.109	0.384	0.8	2.260	1.2?	0.496	0.15	20 Nov 2003
(69230) Hermes	NEA	1.655	2.129	0.624	0.4	13.89	1?	0.579	0.4	18 Oct 2003
(162000) 1990 OS	NEA	1.678	2.175	0.463	0.3	?	>0.6	0.9?	0.045	5 Nov 2003
(3309) Brorfelde	MB	1.818	2.451	0.053	[6?]	?	[11?]	0.77	[1.5?]	Nov 2005
2002 BM26	NEA	1.833	2.482	0.445	0.6	2.7	[~1.1]	~0.8	0.1	9 Feb 2002
(5407) 1992 AX	MCA	1.838	2.492	0.277	4.0	2.549	6.8	0.563	>1.2	7 Jan 1997
(85938) 1999 DJ4	NEA	1.852	2.521	0.483	[0.6?]	2.514	1.5?	0.738	[0.3?]	21 Feb 2004
2006 GY2	NEA	1.855	2.530	0.494	0.45	?	[0.6]	0.488	?	May 2006
(4674) Pauling S/2004 (4674) 1	MB	1.859	2.534	0.070	8	?	250?	[50?]	2.5	4 Mar 2004
(1509) Esclangona S/2003 (1509) 1	MB	1.866	2.549	0.032	12	2.640	140?	[12?]	4	13 Feb 2003
(1866) Sisyphus	NEA	1.894	2.61	0.538	8.2	2.400	?	?	?	Dec 1985
(1453) Fennia	MB	1.897	2.61	0.028	7	6	?	?	?	Nov 2007
(5905) Johnson	MB	1.910	2.640	0.072	5	3.782	[11?]	0.908	2	Apr 2005
(9069) Hovland	MB	1.913	2.646	0.118	3	4.217	[8?]	1.265	0.9	Oct 2004
(5477) 1989 UH2	MB	1.917	2.655	0.076	[7?]	?	[15?]	1.018	[2.5?]	Nov 2005
2000 UG11	NEA	1.929	2.679	0.572	0.23	4.44?	0.34	0.770	0.1	3 Nov 2000
(76818) 2000 RG79	MB	1.930	2.681	0.096	3.6	3.166	[5.5?]	0.588	1.1	Aug 2005
2003 SS84	NEA	1.930	2.682	0.572	0.12	?	[<0.3?]	[1?]	0.06	4 Oct 2003
(1139) Atami	MCA	1.947	2.718	0.256	6	?	[20?]	1.1?	5	Aug 2005
2002 KK8	NEA	1.957	2.737	0.466	0.5	?	?	?	0.1	8 Jun 2002
(7088) Ishtar	NEA	1.981	2.788	0.390	[1.5?]	?	[3?]	0.860	[0.6?]	4 Dec 2005
(153591) 2001 SN263	NEA	1.985	2.797	0.478	2	?	? ?	? ?	1 0.4	12 Feb 2008 12 Feb 2008
(31345) 1998 PG	NEA	2.015	2.861	0.392	0.9	2.516	1.5?	0.584	0.3	29 Aug 1998
2005 NB7	NEA	2.045	2.93	0.517	0.5	>2.5	>0.6	?	0.2	11 Apr 2008
(6244) Okamoto	MB	2.160	3.173	0.153	[7?]	2.894	[15?]	0.848	[1.7?]	26 Sep 2006
(6265) 1985 TW3	MB	2.166	3.19	0.193	[6?]	?	?	?	?	Aug 2007
(6615) Plutarchos	MB	2.170	3.20	0.127	[5?]	2.325	?	1.67	?	14 Apr 2007
(1830) Pogson	MB	2.188	3.24	0.056	[10?]	?	?	?	?	May 2007
(32008) 2000 HM53	MB	2.192	3.25	0.192	[5?]	?	?	?	?	Sep 2007
(1717) Arlon	MB	2.196	3.253	0.129	[9?]	5.148	[18?]	0.760	?	Jan 2006
(3671) Dionysus S/1997 (3671) 1	NEA	2.198	3.259	0.542	1.5	2.705	2.2	1.155	>0.4?	30 May 1997
(17260) 2000 JQ58	MB	2.204	3.272	0.183	[6?]	3.128	[10?]	0.615	[1.5?]	29 Jan 2006
2007 DT103	NEA	2.212	3.29	0.575	[0.5?]	?	?	?	?	Aug 2007
(1089) Tama	MB	2.214	3.293	0.128	11	16.444	11?	0.685	8	24 Dec 2003
2008 BT18	NEA	2.219	3.31	0.597	0.6	<3	0.2	?	?	Jul 2008
(32039) 2000 JO23	MCA	2.223	3.31	0.282	[4?]	?	?	?	?	2007
(9617) Grahamchapman	MB	2.224	3.317	0.113	[5?]	?	?	0.808	[1.4?]	Mar 2006
(2478) Tokai	MB	2.225	3.32	0.068	[10?]	?	?	?	?	Jan 2007
2002 CE26	NEA	2.233	3.337	0.559	3.46	3.293	4.7	0.65	0.3	30 Aug 2004
(2754) Efimov	MB	2.228	3.33	0.232	[7?]	2.450	[12?]	0.614	?	Aug 2006
(10208) 1997 QN1	MB	2.235	3.34	0.201	[4?]	?	?	?	?	2007
(3749) Balam S/2002 (3749) 1 --	MB	2.237	3.345	0.109	7	?	310 ?	110 ?	1.5 ?	8 Feb 2002 2008
(3073) Kursk	MB	2.243	3.36	0.137	[8?]	?	?	?	?	Jan 2007
(939) Isberga	MB	2.247	3.37	0.177	[12?]	2.917	[35?]	1.12	?	26 Feb 2006
(8116) Jeanperrin	MB	2.250	3.37	0.158	[6?]	?	?	?	?	Nov 2007
(34706) 2001 OP83	MCA	2.254	3.385	0.381	[4?]	2.594	[8?]	0.865	[1?]	Dec 2005
(4951) Iwamoto	MB	2.257	3.39	0.167	[7?]	?	?	?	?	May 2007
(114319) 2002 XD58	MCA	2.257	3.391	0.274	[3?]	?	?	?	?	Sep 2005
(3982) Kastel	MB	2.259	3.396	0.218	[8?]	5.83?	[10?]	0.354	?	24 Sep 2005
(1338) Duponta	MB	2.264	3.41	0.113	[12?]	3.855	[23?]	0.73	?	26 Mar 2007
(2486) Metsahovi	MB	2.268	3.42	0.080	[12?]	?	?	?	?	Feb 2007
(809) Lundia	MB	2.283	3.450	0.193	6	15.4?	[12?]	0.64	6	18 Sep 2005
(9260) Edwardolson	MB	2.290	3.465	0.230	[4?]	?	[7?]	0.741	[1?]	Oct 2005
(16635) 1993 QO	MCA	2.298	3.48	0.284	[4?]	?	?	?	?	2007
(6084) Bascom	MB	2.313	3.517	0.236	[9?]	2.745	[32?]	1.810	[3.5?]	Feb 2006
(2006) Polonskaya	MB	2.324	3.544	0.193	10	3.118	[20?]	0.798	3	Nov 2005
(3703) Volkonskaya	MB	2.332	3.562	0.134	3	3.235	[7?]	1?	1.2	2005
(5481) Kiuchi	MB	2.339	3.58	0.062	[8?]	?	?	?	?	2008
(7225) Huntress	MB	2.340	3.58	0.205	[6?]	?	?	?	?	Jan 2008
(3673) Levy	MB	2.345	3.59	0.185	[8?]	?	?	?	?	Dec 2007
1994 XD	NEA	2.350	3.602	0.733	0.6	?	1?	[0.7?]	>0.15	Jul 2005
(4786) Tatianina	MB	2.359	3.622	0.193	[ 8?]	?	?	?	?	Apr 2006
(854) Frostia	MB	2.369	3.645	0.174	14	37.728	15?	1.572	10?	17 Jul 2004
(2044) Wirt	MCA	2.382	3.676	0.341	[8?]	?	[15?]	0.790	[2?]	Jan 2006
2006 VV2	NEA	2.391	3.70	0.603	1.8	?	>1.5	[0.25?]	>0.3	Mar 2007
(3782) Celle	MB	2.415	3.754	0.094	[6?]	3.84	[20?]	1.524	2.5	18 Sep 2001
(4029) Bridges	MB	2.525	4.010	0.133	10	3.694	?	?	?	11 Apr 2006
(11264) Claudiomaccone	MB	2.581	4.146	0.232	4	3.187	[7?]	0.630	>1.2	Dec 2005
(1313) Berna	MB	2.659	4.336	0.207	15?	25.464	16?	1.061	15?	12 Feb 2004
(45) Eugenia Petit-Prince S/2004 (45) 1	MB	2.720	4.487	0.082	215	5.699	1,190 ?	4.766 ?	13 ?	1 Nov 1998 2004
(41) Daphne S/2008 (41) 1	MB	2.764	4.60	0.272	174	5.988	?		?	2008
(4492) Debussy	MB	2.767	4.603	0.179	10?	26.606	10?	1.109	6?	Mar 2004
(216) Kleopatra S/2008 (216) 1 S/2008 (216) 2	MB	2.796	4.67	0.248	217x97x81	5.385	? ?	? ?	? ?	Sep 2008 Sep 2008
(17246) 2000 GL74 S/2004 (17246) 1	MB	2.839	4.784	0.021	4.5	?	230?	90?	2	14 Jan 2004
(22899) 1999 TO14 S/2003 (22899) 1	MB	2.843	4.794	0.085	4.5	?	[170?]	[60?]	1.5	26 Jul 2003
(243) Ida Dactyl	MB	2.862	4.841	0.046	60x25x19	4.634	108	1.54	1.6x1.4x1.2	28 Aug 1993
(22) Kalliope Linus	MB	2.909	4.961	0.103	181	4.148	1,065	3.59	38	29 Aug 2001
(283) Emma S/2003 (283) 1	MB	3.043	5.307	0.153	148	6.888	596	3.36	12	14 Jul 2003
(130) Elektra S/2003 (130) 1	MB	3.119	5.509	0.212	182	5.225	1,252	3.92	4	15 Aug 2003
(379) Huenna S/2003 (379) 1	MB	3.130	5.537	0.191	92	7.022	3,400	80.8	7	14 Aug 2003
(90) Antiope S/2000 (90) 1	MB	3.156	5.607	0.156	110	16.496	170	0.689	110	10 Aug 2000
(762) Pulcova	MB	3.159	5.615	0.097	137	5.839	810	4.0	20	22 Feb 2000
(702) Alauda S/2007 (702) 1	MB	3.192	5.70	0.022	195	8.36	?	?	?	Aug 2007
2005 AB	NEA	3.216	5.768	0.656	1.0	3.338	~1.9	0.747	0.24	Feb 2005
(121) Hermione S/2002 (121) 1	MB	3.446	6.398	0.143	240x150	5.551	768	2.582	18	28 Sep 2002
(107) Camilla S/2001 (107) 1	MB	3.478	6.487	0.079	223	4.844	1,235	3.71	9	1 Mar 2001
(87) Sylvia Romulus Remus	MB	3.490	6.521	0.080	287	5.184	1,356 706	3.650 1.379	18 7	18 Feb 2001 9 Aug 2004
(624) Hektor S/2006 (624) 1	JTA	5.227	11.95	0.024	363x207	6.921	[1,000?]	[2?]	15	16 Jul 2006
(617) Patroclus Menoetius	JTA	5.228	11.953	0.138	122	>40	680	4.283	113	22 Sep 2001
1999 OJ4	TNO	37.969	234.0	0.025	168?	?	[2,200?]	[17?]	93?	4 Oct 2002
(42355) Typhon Echidna	TNO	38.163	235.8	0.541	134	4	[1,300?]	[11?]	78	20 Jan 2006
(139775) 2001 QG298	TNO	39.196	245.4	0.192	171?	13.77?	[240?]	0.574?	171?	2004
2007 TY430	TNO	39.217	245.6	0.263	140?	?	[13,000?]	?	140?	2008
(47171) 1999 TC36 S/2001 (1999 TC36) 1	TNO	39.228	245.7	0.221	379	>8	7,720	50.38	142	8 Dec 2001
(134340) Pluto Charon Hydra Nix	TNO*	39.482	247.9	0.249	2340	153.28	19,640 64,780 48,700	6.387 38.207 24.856	1212 110? 90?	22 Jun 1978 15 May 2005 15 May 2005
(90482) Orcus	TNO	39.301	246.4	0.222	909	13.188	[8,700?]	[11?]	262	13 Nov 2005
2003 AZ84	TNO	39.413	247.4	0.181	686	?	[7,200?]	[13?]	68	2 Dec 2005
(120347) 2004 SB60	TNO	41.970	271.9	0.109	548?	?	[3,500?]	[5?]	190?	< Sep 2006
(80806) 2000 CM105	TNO	42.403	276.1	0.065	224?	?	[2,700?]	[15?]	129?	5 Oct 2002
2003 UN284	TNO	42.499	277.1	0.008	127?	?	[60,000?]	[3,300?]	97?	24 Oct 2003
1999 RT214	TNO	42.518	277.2	0.046	100?	?	[3,300?]	[55?]	69?	< Sep 2006
(55637) 2002 UX25	TNO	42.547	277.5	0.141	649	14.38?	[5,000?]	[8?]	205	26 Aug 2005
2003 QY90	TNO	42.641	278.5	0.055	196?	?	14,000	460	178?	23 Oct 2003
(134860) 2000 OJ67	TNO	42.653	278.6	0.020	253?	?	[2,300?]	[9?]	175?	25 Jun 2003
2001 XR254	TNO	42.887	280.9	0.034	241?	?	[3,400?]	[15?]	231?	< Mar 2007
(136108) Haumea Hi'iaka Namaka	TNO	43.339	285.3	0.189	1960x1520x1000?	3.915?	49,500 39,300	49.12 34.7	310? [170?]	2005 30 Jun 2005
(160256) 2002 PD149	TNO	42.927	281.3	0.061	280?	?	?	?	?	Aug 2007
(50000) Quaoar	TNO	43.612	288.0	0.037	1260	8.840	[11,000?]	[10?]	95	14 Feb 2006
(66652) Borasisi	TNO	43.615	288.0	0.087	166?	?	4,660	46.26	137?	23 Apr 2003
2003 QW111	TNO	43.659	288.5	0.111	226?	?	[10,000?]	[90?]	115?	< Sep 2006
2000 CF105	TNO	43.819	290.1	0.035	170	?	[23,000?]	[500?]	120	12 Jan 2002
(119067) 2001 KP76	TNO	43.844	290.3	0.190	210?	?	?	?	?	2008
(88611) Teharonhiawako Sawiskera	TNO	43.912	291.0	0.030	176	9.505?	27,300	825	122	11 Oct 2001
2001 RZ143	TNO	43.922	291.1	0.060	201?	?	[1,400?]	[ 5?]	192?	< Mar 2007
2001 QW322	TNO	43.943	291.3	0.028	86?	?	[130,000?]	[1,500?]	86?	24 Aug 2001
2003 WU188	TNO	43.981	291.7	0.034	246?	?	[1,300?]	[ 4?]	178?	< Mar 2007
2001 QY297	TNO	43.985	291.7	0.087	282?	?	[2,800?]	[10?]	233?	< Mar 2007
(79360) 1997 CS29	TNO	44.066	292.5	0.016	305?	?	[2,300?]	[6?]	292?	22 Oct 2002
(148780) 2001 UQ18	TNO	44.073	292.6	0.063	340?	?	[5,800?]	[23?]	246?	< Mar 2007
2001 QQ322	TNO	44.108	293.0	0.049	277?	?	?	?	?	2008
(123509) 2000 WK183	TNO	44.202	293.9	0.042	170?	?	[2,400?]	[17?]	141?	< Feb 2007
2003 TJ58	TNO	44.224	294.1	0.083	95?	?	[3,500?]	[70?]	75?	< Mar 2007
2001 FL185	TNO	44.233	294.2	0.077	144?	?	[1,900?]	[16?]	100?	< Mar 2007
2005 PR21	TNO	44.336	295.2	0.106	277?	?	?	?	?	2008
2003 QA91	TNO	44.435	296.2	0.065	277?	?	[1,800?]	[ 5?]	265?	< Mar 2007
1998 WW31 S/2000 (1998 WW31) 1	TNO	44.576	297.6	0.086	133	?	22,300	574	110	22 Dec 2000
2004 PB108	TNO	45.012	302.0	0.102	210?	?	[5,400?]	[45?]	121?	< Mar 2007
(160091) 2000 OL67	TNO	45.121	303.1	0.112	210?	?	?	?	?	2008
2005 EO304	TNO	45.197	303.9	0.077	208?	?	[87,000?]	[7,000?]	120?	15 Apr 2005
(58534) Logos Zoe	TNO	45.511	307.0	0.123	80	?	8,010	312	66	17 Nov 2001
2001 QC298	TNO	46.124	313.3	0.121	189?	?	3,690	19.23	155?	4 Oct 2002
2000 CQ114	TNO	46.347	315.5	0.112	164?	?	[5,900?]	[70?]	133?	6 Jun 2003
2003 QR91	TNO	46.795	320.1	0.190	187?	?	[1,700?]	[ 8?]	170?	< Mar 2007
(119979) 2002 WC19	TNO	47.638	328.8	0.261	400?	?	[2,700?]	[7?]	127?	< Feb 2007
(26308) 1998 SM165 S/2001 (26308) 1	TNO	47.411	326.5	0.368	287	7.98	11,310	130.1	96	22 Dec 2001
2000 QL251	TNO	47.650	328.9	0.216	176?	?	[7,000?]	[70?]	176?	< Sep 2006
(182933) 2002 GZ31	TNO	50.874	362.9	0.245	187?	?	[2,100?]	[13?]	118?	< Feb 2007
(48639) 1995 TL8	TNO	52.218	377.3	0.233	352?	?	[420?]	[0.5?]	161?	9 Nov 2002
(60621) 2000 FE8	TNO	55.699	415.7	0.405	151?	?	[1,200?]	[6?]	115?	< Mar 2007
(82075) 2000 YW134	TNO	58.136	443.3	0.291	431?	?	[1,900?]	[3?]	237?	25 Oct 2002
(60458) 2000 CM114	TNO	59.938	464.0	0.408	150?	?	[2,200?]	[18?]	119?	16 Jan 2006
2006 SF369	TNO	62.434	493.3	0.376	140?	?	[3,000?]	?	140?	2008
(136199) Eris Dysnomia	TNO*	67.669	556.7	0.442	2660	?	[36,000?]	[14?]	350?	10 Sep 2005
(65489) Ceto Phorcys	TNO	102.626	1039.7	0.826	172	?	1,840	9.55	134	11 Apr 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

Other reports of asteroid/TNO companions

© 2001-2007, 2008 by Wm. Robert Johnston.
Last modified 25 September 2008.
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