Combined listing of reported asteroid/TNO companions

Combined Listing of Reported Asteroid/TNO Companions
by Date Reported
compiled by Wm. Robert Johnston
last updated 26 February 2010

This listing of other reported/postulated asteroid/TNO companions is incomplete. In some cases, subsequent analysis and/or observations have refuted the existence of a companion. Some diameter figures are triaxial dimensions from shape models which supercede the interpretations suggesting the presence of a companion. (Note that the delineation between the most likely candidates on this list and the least likely candidates on the previous page is ambiguous; corrections are welcome.)

Explanation: methods include AOT=adaptic optics telescope, HST=Hubble Space Telescope, LC=light curve, OCC=occultation, PER=period, RAD=radar, SP=space probe, SPEC=spectral, T=telescope.

designation	primary			companion		method	date reported (detect)	notes
designation	a (AU)	e	diam. (km)	sep. (km)	diam. (km)	method	date reported (detect)	notes
(433) Eros	1.458	0.223	33 x 17 x 13	?	?	LC	1901	reported by C. Andre based on lightcurve data; later modeled as single elongated object, shape confirmed by NEAR Shoemaker
(624) Hektor	5.214	0.024	370 x 195	240	200	LC	1971	reported by A. F. Cook based on light curve data suggesting a close binary; since modeled as one double-lobed object
(6) Hebe	2.425	0.202	190	900	20	OCC	5 Mar 1977	P. D. Maley based on occultation data; nicknamed "Jebe"; see MPB 5:16-17
(2) Pallas	2.773	0.230	570 x 525 x 482	?	1	OCC	29 May 1978	based on occulation data
(2) Pallas	2.773	0.230	570 x 525 x 482	750	175	T	1980	by E. Hege, W. Cocke, E. Hubbard, J. Christou, and R. Radick based on speckle interferometry; refuted by 29 May 1983 occultation observations
(134340) Pluto	39.482	0.249	2,340	19,571	1,212	T	7 July 1978	by J. Christy based on speckle interferometry observations
				48,680	90?	HST	15 May 2005	by Weaver et al. based on HST observations
				64,780	110?	HST	15 May 2005	by Weaver et al. based on HST observations
(532) Herculina	2.772	0.178	230	975	45	OCC	7 Jun 1978	by E. Bowell and M. A'Hearn at Lowell Obs. and J. McMahon at Boron; designated S/1978 (532) 1; see IAUC 3241
(18) Melpomene	2.296	0.218	140	1,100	65	OCC	11 Dec 1978	by R. M. Williamon based on occultation data; designated S/1978 (18) 1; see IAUC 3315
(29) Amphitrite	2.555	0.072	210	?	?	LC	1979	suggested by E. Tedesco as interpretation of lightcurve data
(49) Pales	3.084	0.235	150	?	?	LC	1979	reported by E. Tedesco based on lightcurve data
(51) Nemausa	2.365	0.067	150	?	?	LC	1979	suggested by E. Tedesco as interpretation of lightcurve data
(129) Antigone	2.866	0.214	115	?	?	LC	1979	suggested by E. Tedesco as interpretation of lightcurve data by F. Scaltriti and V. Zappala
(171) Ophelia	3.133	0.127	120	?	?	LC	1979	reported by E. Tedesco based on lightcurve data
(349) Dembowska	2.926	0.086	140	?	?	LC	1979	suggested by E. Tedesco as interpretation of lightcurve data
(354) Eleonora	2.800	0.112	155	?	?	LC	1979	suggested by E. Tedesco as interpretation of lightcurve data
(944) Hidalgo	5.754	0.660	38	?	?	LC	1979	by E. Tedesco
(1580) Betulia (=1950 KA)	2.197	0.488	6	?	?	PER	1979	reported by E. Tedesco based on long period
(65) Cybele	3.437	0.104	240	900	11	OCC	17 Oct 1979	by V. Rakhimov and O. Najmov at Ura-Tyube based on occultation data; see IAUC 3439
(9) Metis	2.387	0.122	150	1,100	60	OCC	11 Dec 1979	Venezuelan observers; additional reports 23 Dec 1979-23 Feb 1980 by Wang S., Wu Y., Bao M., Deng L., and Wu S. at Purple Mt. Obs.; discounted by 1982 observations; see IAUC 3739, IAUC 3753, IAUC 3767
(12) Victoria	2.336	0.220	110	?	?	T	1980	E. Hege, W. Cocke, E. Hubbard, J. Christou, and R. Radick based on speckle interferometry; irregular shape suggested in 1995 by D. Mitchell, S. Ostro, and K. Rosema based on radar observations
(216) Kleopatra	2.792	0.253	217 x 94 x 81	475	8	OCC	10 Oct 1980	by G. Rattely and B. Cooke based on occultation data
				220	80	LC	1980	by S. J. Weidenschilling based on lightcurve data and 1986 by Ostro et ali based on radar observations; reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
				>800?	5?	AOT	24 Sep 2008	by F. Marchis et al.
				>1,200?	10?	AOT	24 Sep 2008	by F. Marchis et al.
(46) Hestia	2.526	0.172	125	?	?	LC	1981	reported by F. Scaltriti, V. Zappala, and A. W. Harris based on lightcurve data
(146) Lucina	2.719	0.066	140	1,600	6	OCC	18 Apr 1982	by J. Arlot, J. Lecacheux, C. Richardson, and W. Thuillot based on occultation data; see IAUC 3692, IAUC 3699
(146) Lucina	2.719	0.066	140	500	?	?	2003	reported from 1998-2000 astrometric observations by Kikwaya, Thuillot, Rocher, Martins, Arlot, and Angeli
(423) Diotima	3.067	0.040	210	?	?	LC	1982	by H. J. Schober from lightcurve data
(288) Glauke	2.756	0.210	32	200?	15?	PER	1983	reported by A. W. Harris based on long period
(182) Elsa	2.417	0.186	44	?	?	PER	1984	reported by S. Dermott, A. W. Harris, and C. Murray based on long period
(709) Fringilla	2.913	0.116	97	?	?	PER	1984	reported by S. Dermott, A. W. Harris, and C. Murray based on long period
(15) Eunomia	2.645	0.186	260	300	180	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1952 by Groeneveld and Kuiper; model shown unstable in 1985; see ADS abstract
(39) Laetitia	2.771	0.112	145 x 130 x 120	168	120 x 70 x 70	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1972 by Sather; see ADS abstract
(43) Ariadne	2.203	0.169	66	85	70 x 40 x 40	LC	1985	by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1972 by Lustig and Dvorak; see ADS abstract
(44) Nysa	2.424	0.148	70 x 70 x 60	83	50 x 25 x 25	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 25 Sep 1979 by Birch et ali; see ADS abstract
(61) Danae	2.982	0.167	85 x 80 x 75	101	55 x 30 x 30	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1963 by Wood and Kuiper; see ADS abstract
(63) Ausonia	2.395	0.126	100	100	90 x 60 x 55	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1976 by Scaltriti and Zappala'; see ADS abstract
(82) Alkmene	2.758	0.225	60 x 55 x 50	66	40 x 25 x 25	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1979 by Harris et ali; see ADS abstract
(192) Nausikaa	2.402	0.248	100	150	50 x 40 x 40	LC	1985	reported by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data from 1976 by Scaltriti and Zappala'; see ADS abstract
(1220) Crocus (=1932 CU)	3.007	0.067	20	?	20	PER	1985	reported by R. P. Binzel based on long period
(249) Ilse	2.377	0.216	35	?	?	PER	1987	reported by R. P. Binzel based on long period
(280) Philia	2.943	0.107	46	?	?	PER	1987	reported by R. P. Binzel based on long period
(437) Rhodia	2.386	0.248	13	?	?	PER	1987	reported by R. P. Binzel based on long period
(1481) Tubingia (=1938 DR)	3.016	0.049	33	?	?	PER	1987	reported by R. P. Binzel based on long period
(4179) Toutatis (=1989 AC)	2.510	0.634	4.6 x 2.4 x 1.9	?	?	RAD	1988	based on radar observations suggesting a close binary; in 1989-1992 modeled as one double-lobed object
(385) Ilmatar	2.848	0.126	92	?	?	PER	1989	reported by A. W. Harris based on long period
(407) Arachne	2.624	0.069	95	?	?	PER	1989	reported by S. J. Weidenschilling based on long period
(508) Princetonia	3.159	0.018	140	?	?	PER	1989	reported by A. W. Harris based on long period
(4769) Castalia (=1989 PB)	1.063	0.483	1.8 x 0.8	0.75	0.75	RAD	22 Aug 1989	by S. J. Ostro, J. F. Chandler, A. A. Hine, K. D. Rosema, I. I. Shapiro, and D. K. Yeomans based on Arecibo radar observations suggesting a close binary; now modeled as one double-lobed object
(1627) Ivar	1.863	0.397	8	?	?	LC	1990	by Hoffmann and Geyer; single elogated object model preferred
(1620) Geographos (=1951 RA)	1.246	0.335	5.1 x 1.8	?	?	LC	1994	by L. G. Karachkina, V. V. Prokof'eva, and V. P. Tarashchuk based on lightcurve data
1994 AW1	1.105	0.075	0.9	2.1	0.5	LC	1994	by S. Mottola et ali from Jan 1994 observations
(243) Ida	2.860	0.047	60 x 25 x 19	108	1.4	SP	12 Mar 1994	by Galileo space probe
(4197) 1982 TA	2.301	0.772	2?	4.4	2?	LC	1996	by V. V. Prokof'eva, N. M. Gaftonyuk, and V. P. Tarashchuk from Crimean Astrophysical Obs. based on lightcurve data; binary nature not reported from 1996 radar observations
(893) Leopoldina	3.049	0.150	75 x 64	170	54 x 24	OCC	29 Jan 1996	reported by EAON based on occultation data
(5407) 1992 AX	1.838	0.277	4.0	6.8	1.2	LC	1997	by P. Pravec et ali
(35107) 1991 VH	1.136	0.144	1.2	3.2	0.5	LC	29 Mar 1997	by P. Pravec, M. Wolf, and L. Sarounova
(3671) Dionysus	2.199	0.542	0.9	2.3	0.25	LC	10 Jun 1997	by S. Mottola et ali
(31345) 1998 PG	2.015	0.392	0.9	1.5	0.3	LC	1998	by P. Pravec et ali
(175706) 1996 FG3	1.054	0.350	1.4	2.4	0.43	LC	26 Dec 1998	by P. Pravec, L. Sarounova, and M. Wolf
(45) Eugenia	2.720	0.083	215	1180	13	AOT	20 Mar 1999	by W. Merline et ali
(45) Eugenia	2.720	0.083	215	700?	6?	AOT	7 Mar 2007	by F. Marchis et al.
(137170) 1999 HF1	0.819	0.462	3.5	7.0	0.8	LC	1999	by P. Pravec et ali
(2063) Bacchus	1.078	0.349	1.1x0.5x0.5	?	?	RAD	1999	by Ostro et al.; single bilobated object model preferred
(14402) 1991 DB	1.716	0.402	0.7?	?	?	LC	Feb 2000	suggested by P. Pravec
(4486) Mithra (=1987 SB)	2.204	0.661	2?	?	?	RAD	2000	reported by Ostro et ali from radar observations made Jul-Aug 2000 showing bifurcation
(90) Antiope	3.164	0.155	85	170	85	AOT	3 Oct 2000	by W. Merline et ali
(185851) 2000 DP107	1.366	0.377	0.8	2.6	0.3	RAD	3 Oct 2000	by J. Margot et ali
(762) Pulcova	3.161	0.097	137	810	20	AOT	24 Oct 2000	by W. Merline et ali
2000 UG11	1.929	0.572	0.23	0.34	0.1	RAD	10 Nov 2000	by M. Nolan et ali
(87) Sylvia	3.489	0.079	260	1356	18	AOT	23 Feb 2001	(I) by M. Brown and J. Margot
(87) Sylvia	3.489	0.079	260	706	7	AOT	10 Aug 2005	(II) by F. Marchis et ali
(107) Camilla	3.478	0.079	222	1000	9	HST	19 Mar 2001	by A. Storrs et ali
1998 WW31	44.76	0.083	130	22,300	110	T	16 Apr 2001	by C. Veillet, J. Shapiro, and A. Doressoundiram
(66391) 1999 KW4	0.642	0.689	1.2	2.6	0.36	LC/RAD	23 May 2001	suggested by lightcurve observations by P. Pravec and L. Sarounova in June 2000; confirmed by radar observations by L. Benner et ali in May 2001
(22) Kalliope	2.908	0.103	180	1,060	36	AOT	3 Sep 2001	by J. Margot and M. Brown
1998 ST27	0.819	0.530	0.8	4.5	0.12	RAD	9 Oct 2001	by L. Benner et ali
(88611) Teharonhiawako	43.82	0.032	180	31,000	120	T	15 Oct 2001	by D. Osip and S. Burles
(617) Patroclus	5.227	0.139	105	610	95	AOT	29 Oct 2001	by W. Merline et ali
(88710) 2001 SL9	1.061	0.270	1.0	1.8	0.31	LC	3 Nov 2001	by P. Pravec et ali
2001 QW322	44.15	0.083	130	130,000	130	T	9 Nov 2001	by J. Kavelaars
(47171) 1999 TC36	39.34	0.224	280	7,720	135	HST	10 Jan 2002	by C. Trujillo and M. Brown
(47171) 1999 TC36	39.34	0.224	280	870	258	HST	Oct 2007	suggested in 2005 based on lightcurve; identified based on elongated image in HST observations by S. Jacobson and J. L. Margot in 2007, confirmed by S. D. Benecchi et al. in 2009
(26308) 1998 SM165	47.52	0.368	465	6,000	180	HST	24 Jan 2002	by M. Brown and C. Trujillo
(26308) 1998 SM165	47.52	0.368	465	?	?	PER	May 2004	suggested by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(361) Bononia	3.951	0.213	142	?	?	?	31 Jan 2002	suggested by R. Venable
(58534) Logos	45.50	0.124	220	5,200	200	HST	11 Feb 2002	by K. Noll et ali
2002 BM26	1.833	0.445	0.6	1.5	0.1	RAD	11 Feb 2002	by M. Nolan et ali
(3749) Balam	2.236	0.110	7	350	1.5	T	13 Feb 2002	by W. Merline et ali
(3749) Balam	2.236	0.110	7	?	?	?	12 Mar 2008	by F. Marchis et al.
(89355) 2001 VS78	1.787	0.308	3?	?	?	LC	Feb 2002	suggested by P. Pravec
2000 CF105	43.82	0.035	170	23,000	120	HST	22 Mar 2002	by K. Noll et ali
(20000) Varuna (=2000 WR106)	43.23	0.052	980	830	670	LC	Apr 2002	contact binary postulated by D. C. Jewitt and S. S. Sheppard based on lightcurve; see Jewitt and Sheppard
2002 KK8	1.955	0.465	0.5	?	0.1	RAD	17 Jun 2002	by M. Nolan et ali
(121) Hermione	3.438	0.145	209	795	13	AOT	30 Sep 2002	by W. Merline et ali
(66063) 1998 RO1	0.991	0.720	0.9	0.8	0.36	LC	21 Oct 2002	by P. Pravec et ali
2001 QC298	46.11	0.120	430	6,000	180	HST	17 Dec 2002	by K. Noll et ali
(1509) Esclangona	1.866	0.032	12	140	4	T	18 Feb 2003	by W. Merline et ali
(3782) Celle	2.414	0.096	10	30	4	T	3 May 2003	by W. Ryan, E. Ryan, C. Martinez, and L. Stewart
(287) Nephthys	2.353	0.024	70	140	7	T	~Apr 2003	suspected by J. Lecacheux; see J. Manek
(66652) Borasisi	43.58	0.087	166	4,660	137	HST	6 Jun 2003	by K. Noll et ali
(5381) Sekhmet	0.947	0.296	1.0	1.5	0.3	RAD	6 Jul 2003	by M. Nolan, E. Howell, A. Rivkin, and C. Neish
(283) Emma	3.043	0.153	148	370	12	AOT	27 Jul 2003	by W. Merline et ali
(379) Huenna	3.132	0.192	92	1,200	7	AOT	15 Aug 2003	by J. Margot
(130) Elektra	3.119	0.213	182	1,200	4	AOT	17 Aug 2003	by W. Merline et ali
2003 SS84	1.927	0.571	0.12	0.3	0.06	RAD	10 Oct 2003	by M. Nolan et ali
(69230) Hermes	1.655	0.624	0.4	1	0.4	RAD	20 Oct 2003	by J. Margot et ali
(22899) 1999 TO14	2.843	0.085	4.5	170	1.5	HST	26 Oct 2003	by W. Merline et ali
2003 QY90	63.36	0.595	390	10,000	350	T	29 Oct 2003	by S. Kern, J. L. Elliot, and K. B. Clancy
(162000) 1990 OS	1.680	0.463	0.3	0.6	0.045	RAD	10 Nov 2003	by S. Ostro et ali
(65803) Didymos	1.644	0.384	0.8	1.2	0.15	RAD/LC	28 Nov 2003	by P. Pravec et ali
2003 UN284	44.31	0.045	180	60,000	140	T	5 Dec 2003	by Deep Ecliptic Survey Team
(1089) Tama	2.214	0.127	13	20	9	LC	12 Jan 2004	by R. Behrend, R. Roy, C. Rinner, P. Antonini, P. Pravec, A. W. Harris, S. Sposetti, R. Durkee, and A. Klotz
(139775) 2001 QG298	39.20	0.192	260	400	260	LC	12 Feb 2004	reported by S. Sheppard and D. Jewitt
2000 CQ114	46.37	0.119	115	5,900	109	HST	16 Feb 2004	by D. C. Stephens, K. S. Noll, and W. Grundy
(1313) Berna	2.658	0.206	15	20	15	LC	23 Feb 2004	by R. Roy
(17246) 2000 GL74	2.839	0.023	4.5	230	2	HST	24 Feb 2004	by T. M. Tamblyn et ali
(4674) Pauling	1.859	0.070	8	250	2.5	T	5 Mar 2004	by W. Merline et ali
(90377) Sedna	509.8	0.850	1,600?	?	?	PER	15 Mar 2004	suggested based on long rotation period; long rotation period since refuted
(4492) Debussy	2.768	0.177	10	10	6	LC	21 Mar 2004	reported by R. Behrend, R. Roy, S. Sposetti, and L. Bernasconi
(98) Ianthe	2.685	0.189	104	?	?	OCC	Apr 2004	suggested by R. Venable based on occultation observations
(1024) Hale	2.865	0.225	41	?	?	OCC	Apr 2004	suggested by R. Venable based on occultation observations
(772) Tanete	3.004	0.092	118	?	?	OCC	Apr 2004	by R. Sumner and R. Nolthenius
(85938) 1999 DJ4	1.852	0.483	0.7	1.5	0.35	LC	23 Apr 2004	reported by P. Pravec et ali
(32929) 1995 QY9	39.934	0.269	140?	?	?	PER	May 2004	suggested by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(33128) 1998 BU48	33.396	0.383	160?	?	?	PER	May 2004	suggested by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(47932) 2000 GN171	39.715	0.288	280?	?	?	PER	May 2004	suggested by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(164121) 2003 YT1	1.110	0.292	1.0	2.7	0.2	LC	6 May 2004	by Ondrejov Obs. and Arecibo Obs.
(302) Clarissa	2.405	0.112	38x64?	~300?	5?	OCC	24 Jun 2004	reported based on occultation observations by P. Dombrowski
(854) Frostia	2.369	0.173	14	20	10	LC	Jul 2004	by R. Behrend et ali
2002 CE26	2.233	0.559	3	5	0.2	RAD	4 Sep 2004	by M. K. Shepard et ali
(3155) Lee	2.343	0.100	10	?	?	LC	Nov 2004	suggested by W. Ryan, E. Ryan, and C. Martinez based on lightcurve
(9069) Hovland	1.913	0.118	3	8	0.9	LC	16 Nov 2004	reported by B. D. Warner, P. Pravec, A. W. Harris, D. Pray, V. Kanupuru, and R. Dyvig
(2841) Puijo	2.252	0.084	10	?	?	LC	Dec 2004	suggested by B. Warner based on lightcurve observations
(11066) Sigurd	1.391	0.375	3.5	?	?	RAD	Dec 2004	reported by L. Benner et ali based on radar observations indicating a contact binary shape
2004 RZ164	2.559	0.615	0.6?	?	?	LC	Dec 2004	suggested by P. Pravec
2005 AB	3.216	0.656	1.2	2.2?	0.3	LC	11 Feb 2005	by V. Reddy, R. Dyvig, S. D. Quinn, P. Pravec, and P. Kusnirak
(3682) Welther	2.759	0.319	19	33	?	LC	Apr 2005	suggested by P. Szekely et ali based on lightcurve observations
(5905) Johnson	1.910	0.072	5	11?	2	LC	13 Apr 2005	by B. Warner, P. Pravec, P. Kusnirak, D. Pray, A. Galad, S. Gajdos, P. Brown, and Z. Krzeminski
2005 EO304	45.197	0.077	210?	87,000?	120?	T	10 May 2005	by S. Kern and J. Elliot
(6611) 1993 VW	1.696	0.485	1.8?	3?	?	LC	Jun 2005	suggested by P. Pravec et al.
1994 XD	2.350	0.733	0.6	1?	>0.15	RAD	11 Jul 2005	by L. Benner et al.
(136108) Haumea	43.345	0.189	1,400?	49,500	310?	AOT	29 Jul 2005	by A. Bouchez, M. Brown, et ali
(136108) Haumea	43.345	0.189	1,400?	39,300	170?	AOT	Nov 2005	by M. Brown et ali
(76818) 2000 RG79	1.930	0.096	3.6	5.5?	1.1	LC	31 Aug 2005	by B. Warner, P. Pravec, and D. Pray
(1139) Atami	1.947	0.256	6	20?	5	LC	1 Sep 2005	by F. Manzini, R. Crippa, R. Roy, and R. Behrend
(114319) 2002 XD58	2.257	0.274	3?	?	?	LC	Sep 2005	by Ondrejov NEO Photometric Program
(809) Lundia	2.283	0.193	6	12?	6	LC	1 Oct 2005	by A. Kryszczynska et al.
(3982) Kastel	2.259	0.218	9?	10?	?	LC	1 Oct 2005	by Ondrejov NEO Photometric Program
(136199) Eris	66.662	0.442	2,700	37,400	400?	AOT	1 Oct 2005	by M. Brown et al.
1999 OJ4	37.969	0.025	75	3,270	72	HST	6 Oct 2005 (4 Oct 2002)	by D. Stephens and K. Noll
(80806) 2000 CM105	42.403	0.065	220?	2,700?	130?	HST	6 Oct 2005 (5 Oct 2002)	by D. Stephens and K. Noll
(79360) 1997 CS29	44.066	0.016	300?	2,300?	290?	HST	6 Oct 2005 (22 Oct 2002)	by D. Stephens and K. Noll
(82075) 2000 YW134	58.136	0.291	430?	1,900?	240?	HST	6 Oct 2005 (25 Oct 2002)	by D. Stephens and K. Noll
(48639) 1995 TL8	52.218	0.233	350?	420?	160?	HST	6 Oct 2005 (9 Nov 2002)	by D. Stephens and K. Noll
(134860) 2000 OJ67	42.653	0.020	138	2,360	108	HST	6 Oct 2005 (25 Jun 2003)	by D. Stephens and K. Noll
(9260) Edwardolson	2.290	0.230	4?	7?	1?	LC	Oct 2005	by Ondrejov NEO Photometric Program
(3220) Murayama	1.840	0.173	9?	?	3?	LC	Oct 2005	by A. Tsuchikawa, S. Miyasaka, and H. Hamanowa
(3309) Brorfelde	1.818	0.053	6?	11?	1.6?	LC	7 Nov 2005	by Ondrejov NEO Photometric Program
(2006) Polonskaya	2.324	0.194	12?	24?	3?	LC	10 Nov 2005	by Ondrejov NEO Photometric Program; third component also suggested
(5477) 1989 UH2	1.917	0.076	6?	13?	2?	LC	15 Nov 2005	by Ondrejov NEO Photometric Program
(15350) Naganuma	2.379	0.277	11?	22?	?	LC	Nov 2005	by D. Pray et al.
(3703) Volkonskaya	2.332	0.134	3	7?	1.2	LC	Dec 2005	suggested by W. Ryan et al. in 2004
(11264) Claudiomaccone	2.581	0.232	4	7?	1.2	LC	Dec 2005	by Yu. Krugly et al.
(3169) Ostro	1.892	0.067	3.6	4.8?	3.1	LC	Dec 2005	by Descamps et al.
(34706) 2001 OP83	2.254	0.381	4?	8?	1?	LC	29 Dec 2005	by B. Warner and Ondrejov Obs.
(2131) Mayall	1.887	0.111	7.8	?	?	LC	2009	suggested by B. Warner in 2005; not confirmed in 2006; confirmed in 2009
(4440) Tchantches	1.921	0.077	11?	?	?	?	2005
(2044) Wirt	2.382	0.341	8?	16?	2?	LC	6 Jan 2006	by Ondrejov NEO Photometric Program
(1717) Arlon	2.196	0.129	9?	16?	?	LC	17 Jan 2006	by Ondrejov NEO Photometric Program
(7088) Ishtar	1.981	0.390	1.5?	3?	0.6?	LC	31 Jan 2006	by Ondrejov NEO Photometric Program
(6084) Bascom	2.313	0.236	11?	37?	4?	LC	6 Feb 2006	by Ondrejov NEO Photometric Program
(42355) Typhon	38.163	0.541	152	1,628	84	HST	15 Feb 2006	by K. Noll et al.
(9617) Grahamchapman	2.224	0.113	4?	8.5?	1.2?	LC	Mar 2006	by Ondrejov NEO Photometric Program
(17260) 2000 JQ58	2.204	0.183	4.5?	7?	1.2?	LC	14 Mar 2006	by Ondrejov NEO Photometric Program
(60458) 2000 CM114	59.938	0.408	150?	2,200?	119?	HST	Mar 2006	by K. Noll et al.
(2501) Lohja	2.422	0.195	13?	?	?	LC	Apr 2006	suggested by D. Higgins and P. Pravec
(4786) Tatianina	2.359	0.193	10?	20?	2?	LC	11 Apr 2006	by Ondrejov NEO Photometric Program
(4029) Bridges	2.525	0.133	8?	15?	2?	LC	8 May 2006	by Ondrejov NEO Photometric Program
2006 GY2	1.855	0.494	0.45	0.5?	0.08	RAD	2 Jun 2006	by L. A. M. Benner et al.
2004 DC	1.636	0.400	0.3	>0.6	0.06	RAD	2 Jun 2006	by P. A. Taylor et al.
(1857) Parchomenko	2.244	0.134	11?	?	?	LC	7 Jun 2006	by R. Stephens, B. Warner, and P. Pravec
(3665) Fitzgerald	2.417	0.089	10?	?	?	LC	Jun 2006	suggested by P. Pravec
(624) Hektor	5.227	0.024	363x207	1,000?	15	AOT	16 Jul 2006	by F. Marchis et al.
(11116) 1999 EK	2.196	0.226	5?	20?	?	LC	Aug 2006	by Ondrejov Obs.
(3868) Mendoza	2.333	0.099	9?	?	?	LC	Aug 2006	suggested by D. Higgins
(3868) Mendoza	2.333	0.099	9?	20?	2?	LC	6 Jun 2009	by Ondrejov Photometric Program
(65489) Ceto	102.626	0.826	172	1,841	134	HST	Aug 2006	by K. Noll et al.
(2754) Efimov	2.228	0.232	6?	10?	1.2?	LC	4 Sep 2006	by Ondrejov NEO Photometric Program
2003 QW111	43.658	0.111	226?	10,400?	113?	HST	7 Sep 2006	by K. S. Noll et al.
2000 QL251	47.650	0.216	148	5,000	143	HST	12 Sep 2006	by K. S. Noll et al.
(120347) 2004 SB60	41.970	0.109	548?	3,400?	190?	HST	19 Sep 2006	by K. S. Noll et al.
1999 RT214	42.518	0.046	110?	3,300?	50?	HST	29 Sep 2006	by K. S. Noll et al.
(6244) Okamoto	2.160	0.153	5.5?	11?	1.4?	LC	19 Oct 2006	by P. Kusnirak et al.
(3854) George	1.892	0.134	4?	?	?	?	2006
(3073) Kursk	2.243	0.137	6.5?	22?	1.5?	LC	3 Jan 2007	by Ondrejov NEO Photometric Program
(2478) Tokai	2.225	0.068	8?	20?	7?	LC	30 Jan 2007	by Ondrejov NEO Photometric Program
(123509) 2000 WK183	44.202	0.042	178?	2,500?	148?	HST	21 Feb 2007	by K. S. Noll et al.
(50000) Quaoar	43.612	0.037	1260	11,000?	95?	HST	22 Feb 2007	by M. Brown and T.-A. Suer
(55637) 2002 UX25	42.547	0.141	650	5,000?	205?	HST	22 Feb 2007	by M. Brown and T.-A. Suer
(90482) Orcus	39.301	0.222	910	8,700?	260?	HST	22 Feb 2007	by M. Brown and T.-A. Suer
2003 AZ84	39.413	0.181	690	7,200?	68?	HST	22 Feb 2007	by M. Brown and T.-A. Suer
(2486) Metsahovi	2.268	0.080	12?	?	?	LC	26 Feb 2007	by Ondrejov Photometric Program
(119979) 2002 WC19	47.638	0.261	400?	2,800?	127?	HST	27 Feb 2007	by K. S. Noll et al.
(182933) 2002 GZ31	50.874	0.245	204?	2,100?	129?	HST	28 Feb 2007	by K. S. Noll et al.
(21) Lutetia	2.436	0.163	96	1000?	?	SPEC	Mar 2007	suggested by V. Busarev, V. Prokofeva, and V. Bochkov based on spectral analysis; no satellite observed in 2009
2004 PB108	45.012	0.102	241	10,500	131	HST	3 Mar 2007	by K. S. Noll et al.
(60621) 2000 FE8	55.699	0.405	151?	1,200?	115?	HST	3 Mar 2007	by K. S. Noll et al.
(148780) Altjira	44.073	0.063	340?	5,800?	246?	HST	14 Mar 2007
2001 FL185	44.233	0.077	144?	1,900?	100?	HST	14 Mar 2007
2001 QY297	43.985	0.087	282?	2,800?	233?	HST	14 Mar 2007
2001 RZ143	43.922	0.060	201?	1,400?	192?	HST	14 Mar 2007
2001 XR254	42.887	0.034	169	9,270	140	HST	14 Mar 2007
2003 QA91	44.435	0.065	277?	1,800?	265?	HST	14 Mar 2007
2003 QR91	46.795	0.190	187?	1,700?	170?	HST	14 Mar 2007
2003 TJ58	44.224	0.083	65	3,770	51	HST	14 Mar 2007
2003 WU188	43.981	0.087	247?	1,300?	179?	HST	14 Mar 2007
(1338) Duponta	2.264	0.113	12?	23?	3?	LC	27 Mar 2007	by Ondrejov Photometric Program
2006 VV2	2.391	0.603	1.8	1.5?	0.3?	RAD	5 Apr 2007	by L. A. M. Benner et al.
(1830) Pogson	2.188	0.056	10?	25?	3?	LC	10 May 2007	by Ondrejov Photometric Program
(4951) Iwamoto	2.257	0.167	4	30?	3.5	LC	11 May 2007	by Ondrejov Photometric Program
(6265) 1985 TW3	2.166	0.193	6?	10?	1.4?	LC	2 Aug 2007	by Ondrejov Photometric Program
(702) Alauda	3.192	0.022	195	900?	6	AOT	2 Aug 2007	by P. Rojo and J. L. Margot
2007 DT103	2.212	0.575	0.3	>0.45	0.08	RAD	3 Aug 2007	by L. A. M. Benner et al.
(160256) 2002 PD149	42.927	0.061	210?	24,000?	180?	HST	31 Aug 2007	by K. S. Noll et al.
(32008) 2000 HM53	2.192	0.192	5?	15?	2?	LC	20 Sep 2007	by Ondrejov Photometric Program
(10208) 1997 QN1	2.235	0.201	4?	18?	2?	LC	25 Sep 2007	by Ondrejov Photometric Program
(17365) 1978 VF11	5.267	0.078	92?	120?	77?	LC	Sep 2007	by R. K. Mann et al.
(29314) 1994 CR18	5.249	0.073	32?	42?	24?	LC	Sep 2007	by R. K. Mann et al.
(2658) Gingerich	3.077	0.285	11?	?	?	LC	Oct 2007	by L. A. Molnar and M. J. Haegert
(6615) Plutarchos	2.170	0.127	4.5?	14?	?	LC	Oct 2007	by J. Oey, D. P. Pray, and P. Pravec
(8116) Jeanperrin	2.250	0.158	6?	18?	2?	LC	9 Nov 2007	by Ondrejov Photometric Program
(939) Isberga	2.247	0.177	11?	35?	?	LC	Nov 2007	by L. A. Molnar et al.
(16635) 1993 QO	2.298	0.284	6?	16?	1.5?	LC	19 Nov 2007	by Ondrejov Photometric Program
(32039) 2000 JO23	2.223	0.282	3?	40?	1.5?	LC	23 Nov 2007	by Ondrejov Photometric Program
(1453) Fennia	1.897	0.028	7.2	16?	2	LC	1 Dec 2007	by Ondrejov Photometric Program
(3673) Levy	2.345	0.185	10?	20?	3?	LC	12 Dec 2007	by Ondrejov Photometric Program
(1866) Sisyphus	1.894	0.538	8.2	?	?	RAD	~Dec 2007 (Dec 1985)	from Arecibo
(7225) Huntress	2.340	0.205	6.5?	10?	1.4?	LC	31 Jan 2008	by Ondrejov Photometric Program
(153591) 2001 SN263	1.985	0.478	2.8	17	1.2	RAD	12 Feb 2008	by M. C. Nolan et ali
(153591) 2001 SN263	1.985	0.478	2.8	4	0.5	RAD	12 Feb 2008	by M. C. Nolan et ali
2006 SF369	62.434	0.376	140?	3,000?	140?	HST	19 Feb 2008	by K. S. Noll et al.
(119067) 2001 KP76	43.844	0.190	150?	8,900?	145?	HST	19 Feb 2008	by F. Marchis et al.
(160091) 2000 OL67	45.121	0.112	170?	7,800?	130?	HST	19 Feb 2008	by F. Marchis et al.
(162483) 2000 PJ5	0.873	0.374	0.55	1.05	0.28	LC	Feb 2008 (Jul 2005)	by D. Polishook and N. Brosch
(85989) 1999 JD6	0.883	0.633	1.2?	?	?	LC	Feb 2008 (Jul 2005)	by D. Polishook and N. Brosch
(86450) 2000 CK33	0.968	0.415	0.8?	?	?	LC	Feb 2008 (May 2005)	by D. Polishook and N. Brosch
2003 NZ6	0.793	0.492	0.6?	?	?	LC	Feb 2008 (Jun 2005)	by D. Polishook and N. Brosch
2001 QQ322	44.108	0.049	205?	4,000?	187?	HST	4 Mar 2008	by K. S. Noll et al.
2005 PR21	44.336	0.106	238	3,700?	143?	HST	4 Mar 2008	by K. S. Noll et al.
(7369) Gavrilin	2.369	0.319	9?	?	?	LC	14 Mar 2008	suggested by Ondrejov Photometric Survey
(3873) Roddy	1.892	0.134	13?	?	?	LC	Mar 2008	suggested by B. Warner based on lightcurve
(41) Daphne	2.764	0.272	174	500?	<2	AOT	31 Mar 2008	by A. R. Conrad et al.
(5481) Kiuchi	2.339	0.062	10?	20?	3?	LC	15 Apr 2008	by Ondrejov Photometric Survey
2005 NB7	2.045	0.517	0.5	>0.6	0.2	RAD	17 Apr 2008	by M. K. Shepard et al.
(5474) Gingasen	2.385	0.066	10?	?	?	LC	30 Jun 2008	suggested by D. Higgens et al.
2008 BT18	2.219	0.597	0.6	>1.5	0.2	RAD	29 Jul 2008	by L. A. M. Benner et al.
2007 TY430	39.217	0.263	140?	13,000?	140?	AOT	1 Aug 2008	by S. Sheppard and C. Trujillo
(1333) Cevenola	2.635	0.133	18?	?	6?	LC	12 Oct 2008
(3623) Chaplin	2.854	0.088	13?	?	?	?	12 Oct 2008
(15268) Wendelinefroger	2.366	0.234	6?	13?	1.5?	LC	20 Oct 2008	by J. Oey
1998 WV24	38.876	0.034	110?	1400?	80?	HST	29 Oct 2008	by Benecchi et al.
(4182) Mount Locke	2.798	0.135	12?	?	?	?	2008
(7516) Kranjc	2.312	0.240	8?	?	?	?	2008
(15515) 1999 VN80	2.877	0.244	5?	?	?	?	2008	not confirmed in followup observations
(2577) Litva	1.904	0.138	7?	20?	2.5?	LC	11 Mar 2009	by B. D. Warner et al.
(4607) Seilandfarm	2.264	0.020	10?	23?	3?	LC	11 Mar 2009	by Ondrejov Photometric Survey
(11116) 1996 EK	2.197	0.226	5?	15?	?	LC	Apr 2009	by Ondrejov Photometric Survey
2002 VF130	45.729	0.117	126?	22,000?	110?	HST	3 May 2009	by K. S. Noll et al.
(6708) Bobbievaile	2.445	0.182	8?	16?	4.5?	LC	7 May 2009	by Ondrejov Photometric Survey
2002 XH91	43.774	0.092	334?	19,900?	176?	HST	27 May 2009	by K. S. Noll et al.
(3868) Mendoza	2.333	0.099	8?	20?	2?	LC	6 Jul 2009	by J. Oey et al.
(136617) 1994 CC	1.639	0.418	0.65	0.5	0.05	RAD	19 Jul 2009	from Goldstone and Arecibo
(136617) 1994 CC	1.639	0.418	0.65	1.2	0.10	RAD	19 Jul 2009	from Goldstone and Arecibo
(26471) 2000 AS152	1.918	0.154	8?	26?	3?	LC	20 Jul 2009	by B. D. Warner et al.
(93) Minerva	2.753	0.142	142	630?	4	AOT	31 Aug 2009	by F. Marchis et al.
(93) Minerva	2.753	0.142	142	380?	3	AOT	31 Aug 2009	by F. Marchis et al.
1999 XY143	42.966	0.083	212?	2,600?	178?	HST	24 Sep 2009	by K. S. Noll et al.
1999 RY214	45.361	0.182	125?	1,800?	75?	HST	24 Sep 2009	by K. S. Noll et al.
2002 VT130	42.470	0.035	259?	2,500?	211?	HST	24 Sep 2009	by K. S. Noll et al.
2000 WT169	44.873	0.013	205?	2,800?	168?	HST	27 Sep 2009	by K. S. Noll et al.
2003 YU179	46.601	0.158	147?	2,300?	81?	HST	27 Sep 2009	by K. S. Noll et al.
2000 CO101	1.076	0.090	0.5	0.6?	0.045	RAD	2 Oct 2009	by P. A. Taylor et al.
(317) Roxane	2.286	0.085	19	245?	5	AOT	26 Nov 2009	by W. Merline et al.
(2074) Shoemaker	1.800	0.082	5?	?	?	LC	2009
(234) Barbara	2.386	0.244	37?	?	21?	?	2009	proposed by M. Delbo, S. Ligori, A. Matter, A. Cellino, and J. Berthier
(2131) Mayall	1.887	0.111	7.8	16?	2?	LC	31 Dec 2009	by B. Warner et al.
(5899) Jedicke	1.929	0.117	5?	9?	1.6?	LC	25 Feb 2010
(8373) Stephengould	3.285	0.554	5?	16?	1.5?	LC	4 Mar 2010

Principal sources on unconfirmed companions:

Cellino, A., R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi, "Do we observe light curves of binary asteroids?," 1984, Astronomy and Astrophysics, 144:355-362.
Denissenko, Denis, 15 Feb 2002, List of double minor planets.
Dunham, David, 27 Feb 2002, Observed minor planet occultation events.
Faure, G., 18 March 2006, Binary asteroids on March 18, 2006.
Higgins, David, 2006, Minor planet lightcurves.
JPL, 2003, JPL DASTCOM Database.
"A list of suspected or known binary asteroids," 2 April 2002, http://www.bdl.fr/observateur/binast/binary_ast.php.
Peebles, Curtis, 2000, Asteroids: A history, Smithsonian Institution Press, Washington, DC.
Tedesco, E., "Binary asteroids: evidence for their existence from lightcurves," 1979, Science, 203:905-907.
Tedesco, E., et ali, Mar 1998, IRAS Minor Planet Survey, version 4, IMPS Derived Diameters and Albedos.
Weidenschilling, Stuart J., Paolo Paolicchi, and Vincenzo Zappala', 1989, Do asteroids have satellites?, pp. 643-658 in Asteroids, ed. by R. P. Binzel, T. Gehrels, and M. S. Matthews, Univ. of Arizona Press, Tucson, AZ.

Also see individual pages on asteroid/TNO companions for sources.

© 2002-2009, 2010 by Wm. Robert Johnston.
Last modified 26 February 2010.
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Combined Listing of Reported Asteroid/TNO Companionsby Date Reported

Combined Listing of Reported Asteroid/TNO Companions
by Date Reported