Other Reports of Asteroid/TNO Companions

compiled by Wm. Robert Johnston
last updated 26 March 2014

This listing of other reported/postulated asteroid/TNO companions may be incomplete. It includes 127 asteroids: 111 suggested binaries, plus 16 cases where 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.)

designationprimary
a (AU)
primary
e
primary
diameter (km)
companion
separation (km)
companion
diameter (km)
notes
(2) Pallas2.7730.230570 x 525 x 482?129 May 1978 based on occulation data
7501751980 by E. Hege, W. Cocke, E. Hubbard, J. Christou, and R. Radick based on speckle interferometry; refuted by 29 May 1983 occultation observations
(6) Hebe2.4250.202185900205 Mar 1977 by P. D. Maley based on occultation data (nicknamed "Jebe"); see MPB 5:16-17
(9) Metis2.3870.12220511006011 Dec 1979 by 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) Victoria2.3360.220127??1980 by 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
(15) Eunomia2.6450.186255300180reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data; model shown unstable in 1985
(18) Melpomene2.2960.21814111006511 Dec 1978 by R. M. Williamon based on occultation data; designated S/1978 (18) 1; see IAUC 3315
(21) Lutetia2.4360.163961000??Mar 2007 by V. Busarev, V. Prokofeva, and V. Bochkov based on spectral analysis; no satellite observed during Rosetta flyby in 2010
(29) Amphitrite2.5550.072227??suggested 1979 by E. Tedesco as interpretation of lightcurve data
(39) Laetitia2.7710.112145 x 130 x 120168120 x 70 x 70reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(43) Ariadne2.2030.169728570 x 40 x 40reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(44) Nysa2.4240.14870 x 70 x 608350 x 25 x 25reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(46) Hestia2.5260.172124??reported 1981 by F. Scaltriti, V. Zappala, and A. W. Harris based on lightcurve data
(49) Pales3.0840.235150??reported 1979 by E. Tedesco based on lightcurve data
(51) Nemausa2.3650.067148??suggested 1979 by E. Tedesco as interpretation of lightcurve data
(61) Danae2.9820.16785 x 80 x 7510155 x 30 x 30reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(63) Ausonia2.3950.12610310090 x 60 x 55reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(65) Cybele3.4370.1042379001117 Oct 1979 by V. Rakhimov and O. Najmov at Ura-Tyube based on occultation data; see IAUC 3439
(82) Alkmene2.7580.22560 x 55 x 506640 x 25 x 25reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(98) Ianthe2.6850.189104??suggested in Apr 2004 by R. Venable based on occultation observations
(129) Antigone2.8660.214130??suggested 1979 by E. Tedesco as interpretation of lightcurve data by F. Scaltriti and V. Zappala
(146) Lucina2.7190.0661321600618 Apr 1982 by J. Arlot, J. Lecacheux, C. Richardson, and W. Thuillot based on occultation data; see IAUC 3692, IAUC 3699
500?reported 2003 from 1998-2000 astrometric observations by Kikwaya, Thuillot, ROcher, Martins, Arlot, and Angeli
(171) Ophelia3.1330.127104??reported 1979 by E. Tedesco based on lightcurve data
(182) Elsa2.4170.18644??reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period
(192) Nausikaa2.4020.24810315050 x 40 x 40reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(234) Barbara2.3860.2445424?21?suggested in 2009 by M. Delbo, S. Ligori, A. Matter, A. Cellino, and J. Berthier based on thermal modeling
(249) Ilse2.3770.21635??reported 1987 by R. P. Binzel based on long period
(279) Thule4.2710.010127??suggested in 2010
(280) Philia2.9430.10746??reported 1987 by R. P. Binzel based on long period
(287) Nephthys2.3530.02462140?suspected 2003
(288) Glauke2.7560.21032200?15?reported 1983 by A. W. Harris based on long period
(302) Clarissa2.4050.11238x64?~300?5?reported based on occultation observations by P. Dombrowski on 24 Jun 2004
(349) Dembowska2.9260.086140??suggested 1979 by E. Tedesco as interpretation of lightcurve data
(354) Eleonora2.8000.112155??suggested 1979 by E. Tedesco as interpretation of lightcurve data
(361) Bononia3.9510.213142??suggested 31 Jan 2002 by R. Venable
(385) Ilmatar2.8480.12692??reported 1989 by A. W. Harris based on long period
(407) Arachne2.6240.06995??reported 1989 by S. J. Weidenschilling based on long period
(423) Diotima3.0670.040209??1982 by H. J. Schober from lightcurve data
(433) Eros1.4580.22333 x 17 x 13??reported 1901 by C. Andre based on lightcurve data; later modeled as single elongated object, shape confirmed by NEAR Shoemaker
(437) Rhodia2.3860.24816??reported 1987 by R. P. Binzel based on long period
(508) Princetonia3.1590.018142??reported 1989 by A. W. Harris based on long period
(532) Herculina2.7720.178222975457 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
(709) Fringilla2.9130.11691??reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period
(772) Tanete3.0040.092143??based on occultation observations by R. Sumner and R. Nolthenius in Apr 2004; see IOTA page
(893) Leopoldina3.0490.15075 x 6417054 x 24reported 29 Jan 1996 by EAON based on occultation data
(911) Agamemnon5.2710.0671672785reported Sep 2013 by B. Timerson et al. based on occultation data
(944) Hidalgo5.7540.66038??suggested 1979 by E. Tedesco based on lightcurve variation with solar phase angle
(1024) Hale2.8650.22548??suggested in Apr 2004 by R. Venable based on occultation observations
(1090) Sumida2.3600.219???suggested in Oct 2012 by B. Warner based on lightcurve observations
(1220) Crocus
(=1932 CU)
3.0070.06718?20reported 1985 by R. P. Binzel based on long period
(1344) Caubeta2.2480.1205.8??reported Jan 2012 as probable but inconclusive by Photometric Survey for Asynchronous Binary Asteroids program
(1481) Tubingia
(=1938 DR)
3.0160.04937??reported 1987 by R. P. Binzel based on long period
(1580) Betulia
(=1950 KA)
2.1970.4886??reported 1979 by E. Tedesco based on long period
(1620) Geographos
(=1951 RA)
1.2460.3355.1 x 1.8??1994 by L. G. Karachkina, V. V. Prokof'eva, and V. P. Tarashchuk based on lightcurve data
(1627) Ivar1.8630.3978.4??suggested by Hoffmann and Geyer in 1990 based on lightcurve observations; single elogated object model preferred
(1857) Parchomenko2.2440.1348.5??reported 7 Jun 2006
(1979) Sakarov2.3730.100???suggested in July 2013 based on lightcurve observations
(2063) Bacchus1.0780.3491.1 x 0.5 x 0.5??suggested by Ostro et al. in 1999 based on radar observations, but single bilobated object model preferred
(2074) Shoemaker1.8000.0825???suggested in 2009 by Warner et al. based on reanalysis of 2003 lightcurve observations by R. D. Stephens
(2083) Smither1.8720.0514.3??suggested by B. D. Warner et al. in 2010 based on lightcurve observations
(2501) Lohja2.4220.19512??suggested by D. Higgins and P. Pravec in Apr 2006 based on lightcurve observations
(2658) Gingerich 3.0770.28512??reported in Oct 2007 by L. A. Molnar and M. J. Haegert based on lightcurve observations; see MPB 34:4
(2841) Puijo2.2520.0856.8??suggested in Dec 2004 by B. Warner based on lightcurve observations
(3076) Garber2.2380.1895.3??suggested by D. Higgins et al. in 2010 based on lightcurve observations
(3145) Walter Adams2.1920.2373.8??suggested by L. E. Owings et al. in 2010 based on lightcurve observations
(3155) Lee2.3420.10010??suggested in Nov 2004 by W. Ryan, E. Ryan, and C. Martinez based on lightcurve
(3220) Murayama2.2250.1749???suggested in Oct 2005 by A. Tsuchikawa, S. Miyasaka, and H. Hamanowa based on lightcurve
(3352) McAuliffe1.8790.3692???suggested in Jul 2012 by B. D. Warner based on lightcurve observations
(3623) Chaplin2.8540.08813???suggested 12 Oct 2008
(3665) Fitzgerald2.4170.08910???suggested by P. Pravec in Jun 2006 based on lightcurve observations
(3682) Welther2.7530.3231933?suggested in Apr 2004 by P. Szekely et ali based on lightcurve observations
(3704) Gaoshiqi2.4100.051???suggested in July 2013 based on lightcurve observations
(3854) George1.8920.1344???suggested in 2006 by B. D. Warner et al. based on lightcurve observations
(4179) Toutatis
(=1989 AC)
2.5310.6294.6 x 2.4 x 1.9??1988 based on radar observations suggesting a close binary; in 1989-1992 modeled as one double-lobed object
(4182) Mount Locke2.7980.13510??suggested in 2008 by Behrend based on lightcurve observations
(4197) 1982 TA2.3000.7723.04.42?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
(4217) Engelhardt2.3130.2139.2??suggested in April 2012 by B. D. Warner based on lightcurve observations
(4486) Mithra
(=1987 SB)
2.2040.6601.8??reported in 2000 by Ostro et ali from radar observations made July-August 2000 showing bifurcation
(4769) Castalia
(=1989 PB)
1.0630.4831.8 x 0.80.750.7522 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
(5325) Silver2.3650.2188.9??suggested by D. Higgins et al. in 2010 based on lightcurve observations
(5828) 1991 AM1.6970.6962?5??suggested Sep 2013 by B. Warner based on lightcurve observations
(5968) Trauger1.9080.0265?10??suggested Dec 2013 by B. Warner based on lightcurve observations
(6170) Levasseur2.3510.3196??suggested by D. Higgins et al. in 2010 based on lightcurve observations
(6602) Gilclark1.8710.0745???suggested by B. D. Warner in Mar 2014 based on lightcurve observations
(6611) 1993 VW1.6960.4851.8?3??suggested by P. Pravec et al. in Jun 2005 based on lightcurve observations
(6815) Mutchler2.4330.1905???suggested 4 Nov 2006 by Photometric Survey for Asynchronous Binary Asteroids program based on lightcurve observations
(6901) Roybishop1.9420.1125.8??suggested by B. D. Warner et al. in 2010 based on lightcurve observations
(7033) 1994 WN22.2420.0444.7??reported 6 Apr 2009 as inconclusive by Photometric Survey for Asynchronous Binary Asteroids program
(7173) Sepkoski1.9570.0136???suggested by B. D. Warner in Mar 2014 based on lightcurve observations
(7247) 1991 TD11.9170.1184??suggested Jan 2013 by B. Warner based on lightcurve observations
(7516) Kranjc2.3120.2406.1??suggested Apr 2008 by Oey based on lightcurve observations; not confirmed
(7758) Poulanderson2.3820.186???suggested in Oct 2012 by B. Warner based on lightcurve observations
(11001) Andrewulff2.2270.2124???reported Apr 2012 as inconclusive by Photometric Survey for Asynchronous Binary Asteroids program
(11066) Sigurd1.3920.3752.8??reported in Dec 2004 by L. Benner et ali based on radar observations indicating a contact binary shape
(11116) 1999 EK2.1960.2263.120??reported in 2006 and 2009 based on lightcurve observations
(12390) 1994 WB11.8550.1514?6??suggested Sep 2013 by B. D. Warner and R. D. Stephens based on lightcurve observations
(14402) 1991 DB1.7160.4020.6???suggested by P. Pravec in Feb 2000 based on lightcurve observations
(14950) 1996 BE22.2590.0985.7??reported 10 Jun 2010 as inconclusive by Photometric Survey for Asynchronous Binary Asteroids program
(15350) Naganuma2.3810.2754.422??suggested Nov 2005 by D. Pray et al. based on lightcurve observations
(15515) 1999 VN802.8770.24410??suggested 2008 by R. Behrend based on lightcurve observations; not confirmed
(20000) Varuna
(=2000 WR106)
42.8550.052785??suggested in 2002 based on lightcurve observations
(20037) Duke1.8840.1213??suggested by B. D. Warner in 2010 based on lightcurve observations
(24465) 2000 SX1551.9250.0854???suggested in Jul 2012 by B. D. Warner based on lightcurve observations
(25332) 1999 KK61.8920.0625??suggested Jan 2013 by B. Warner based on lightcurve observations
(25884) 2000 SQ41.9540.0814??suggested by B. D. Warner et al. in July 2012 based on lightcurve observations
(29168) 1990 KJ2.3080.1774.9??reported Sep 2011 as probable but inconclusive by Photometric Survey for Asynchronous Binary Asteroids program
(32929) 1995 QY939.9340.269140???suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(33128) 1998 BU4833.1560.384160???suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(46037) 2001 DF332.7630.3516???suggested in April 2012 by B. D. Warner based on lightcurve observations
(47932) 2000 GN17139.3660.281234??suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(53431) 1999 UQ101.8370.1445??suggested by B. D. Warner in 2010 based on lightcurve observations
(66146) 1998 TU30.7370.4844??suggested by Hicks et al. in 2010 based on lightcurve observations
(67175) 2000 BA191.9050.0683.5??suggested Jan 2013 by B. Warner based on lightcurve observations
(70030) Margaretmiller1.9530.0853.5??suggested by B. D. Warner in Jan 2012 based on lightcurve observations
(85989) 1999 JD60.8830.6331.5??suggested in Feb 2008 by D. Polishook and N. Brosch based on lightcurve observations
(86450) 2000 CK330.9680.4150.8???suggested in Feb 2008 by D. Polishook and N. Brosch based on lightcurve observations
(89355) 2001 VS781.7870.3083???suggested by P. Pravec in Feb 2002 based on lightcurve observations
(90377) Sedna
(=2003 VB12)
509.80.850995??suggested in 2004 by M. Brown et al. based on long rotation period; long rotation period since refuted
(119744) 2001 YN422.5840.2543???suggested by B. D. Warner in Mar 2014 based on lightcurve observations
(137199) 1999 KX41.4570.2931.4?1.7??suggested Dec 2013 by A. Carbognani based on lightcurve observations
(242191) 2003 NZ60.7930.4920.37??suggested in Feb 2008 by D. Polishook and N. Brosch based on lightcurve observations
(263976) 2009 KD51.0460.2620.79??reported 30 Jun 2010 by M. Hicks et al. based on lightcurve observations
(330825) 2008 XE32.6080.5502?1.5??suggested Dec 2013 by A. Carbognani based on lightcurve observations
2003 SQ31742.690.08180???suggested by P. Lacerda et al. in Sep 2013 based on lightcurve observations
2004 RZ1642.5540.6150.6???suggested by P. Pravec in Dec 2004 based on lightcurve observations
2010 WG953.540.64970?790?70?suggested May 2013 based on long rotation period by D. Rabinowitz et al.
2011 EZ782.4010.5391.3???suggested Jul 2011 based on lightcurve observations by Photometric Survey for Asynchronous Binary Asteroids program
2012 RV162.7570.6750.4???suggested Nov 2012 based on radar observations

Principal sources:


© 2002-2013, 2014 by Wm. Robert Johnston.
Last modified 26 March 2014.
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