Other Reports of Asteroid/TNO Companions

compiled by Wm. Robert Johnston
last updated 24 October 2006

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.)

designationprimary
a (AU)
primary
e
primary
diameter (km)
companion
separation (km)
companion
diameter (km)
notes
(2) Pallas2.7730.230570 x 525 x 482129 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) Hebe2.4250.202190900205 Mar 1977 by P. D. Maley based on occultation data (nicknamed "Jebe")
(9) Metis2.3870.12215011006011 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) Victoria2.3360.2201101980 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) Eunomia2.6450.186260300180reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data; model shown unstable in 1985
(18) Melpomene2.2960.21814011006511 Dec 1978 by R. M. Williamon based on occultation data; designated S/1978 (18) 1; see IAUC 3315
(29) Amphitrite2.5550.072210suggested 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) Ariadne2.2030.169668570 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) Hestia2.5260.172125reported 1981 by F. Scaltriti, V. Zappala, and A. W. Harris based on lightcurve data
(49) Pales3.0840.235150reported 1979 by E. Tedesco based on lightcurve data
(51) Nemausa2.3650.067150suggested 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) Ausonia2.3950.12610010090 x 60 x 55reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(65) Cybele3.4370.1042409001117 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) Antigone2.8660.214115suggested 1979 by E. Tedesco as interpretation of lightcurve data by F. Scaltriti and V. Zappala
(146) Lucina2.7190.0661401600618 Apr 1982 by J. Arlot, J. Lecacheux, C. Richardson, and W. Thuillot based on occultation data; see IAUC 3692, IAUC 3699
500reported 2003 from 1998-2000 astrometric observations by Kikwaya, Thuillot, ROcher, Martins, Arlot, and Angeli
(171) Ophelia3.1330.127120reported 1979 by E. Tedesco based on lightcurve data
(182) Elsa2.4170.18644reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period
(192) Nausikaa2.4020.24810015050 x 40 x 40reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data
(216) Kleopatra2.7920.253217 x 94 x 81475810 Oct 1980 by G. Rattely and B. Cooke based on occultation data
220801980 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
(249) Ilse2.3770.21635reported 1987 by R. P. Binzel based on long period
(280) Philia2.9430.10746reported 1987 by R. P. Binzel based on long period
(287) Nephthys2.3530.02470140suspected 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) Dembowska2.9260.086140suggested 1979 by E. Tedesco as interpretation of lightcurve data
(354) Eleonora2.8000.112155suggested 1979 by E. Tedesco as interpretation of lightcurve data
(361) Bononia3.9510.213142??suggested 31 Jan 2002 by R. Venable
(385) Ilmatar2.8480.12692reported 1989 by A. W. Harris based on long period
(407) Arachne2.6240.06995reported 1989 by S. J. Weidenschilling based on long period
(423) Diotima3.0670.0402101982 by H. J. Schober from lightcurve data
(433) Eros1.4580.22333 x 17 x 13reported 1901 by C. Andre based on lightcurve data; later modeled as single elongated object, shape confirmed by NEAR Shoemaker
(437) Rhodia2.3860.24813reported 1987 by R. P. Binzel based on long period
(508) Princetonia3.1590.018140reported 1989 by A. W. Harris based on long period
(532) Herculina2.7720.178230975457 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
(624) Hektor5.2140.024370 x 195240200reported 1971 by A. F. Cook based on light curve data suggesting a close binary; since modeled as one double-lobed object
(709) Fringilla2.9130.11697reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period
(772) Tanete3.0040.092118??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
(944) Hidalgo5.7540.66038??suggested 1979 by E. Tedesco based on lightcurve variation with solar phase angle
(1024) Hale2.8650.22541??suggested in Apr 2004 by R. Venable based on occultation observations
(1220) Crocus
(=1932 CU)
3.0070.0672020reported 1985 by R. P. Binzel based on long period
(1481) Tubingia
(=1938 DR)
3.0160.04933reported 1987 by R. P. Binzel based on long period
(1580) Betulia
(=1950 KA)
2.1970.4886reported 1979 by E. Tedesco based on long period
(1620) Geographos
(=1951 RA)
1.2460.3355.1 x 1.81994 by L. G. Karachkina, V. V. Prokof'eva, and V. P. Tarashchuk based on lightcurve data
(1627) Ivar1.8630.3978??suggested by Hoffmann and Geyer in 1990 based on lightcurve observations; single elogated object model preferred
(1857) Parchomenko2.2430.024?reported 7 Jun 2006
(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
(2501) Lohja2.4220.19514?
(2841) Puijo2.2520.08410??suggested in Dec 2004 by B. Warner based on lightcurve observations
(3155) Lee2.3430.10010??suggested in Nov 2004 by W. Ryan, E. Ryan, and C. Martinez based on lightcurve
(3169) Ostro1.8920.06710???reported by Descamps et al. in Dec 2005; see CBET 320
(3220) Murayama1.8400.173???suggested in Oct 2005 by A. Tsuchikawa, S. Miyasaka, and H. Hamanowa based on lightcurve
(3665) Fitzgerald2.4180.08910?
(3682) Welther2.7590.3191933?suggested in Apr 2004 by P. Szekely et ali based on lightcurve observations
(3782) Celle
(=1986 TE)
2.4140.09611reported 3 May 2003 based on photometric data
(3868) Mendoza2.3340.0989???
(4179) Toutatis
(=1989 AC)
2.5100.6344.6 x 2.4 x 1.91988 based on radar observations suggesting a close binary; in 1989-1992 modeled as one double-lobed object
(4197) 1982 TA2.3010.7722?4.42?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
(4486) Mithra
(=1987 SB)
2.2040.6612reported in 2000 by Ostro et ali from radar observations made July-August 2000 showing bifurcation
(4492) Debussy
(=1988 SH)
2.7680.1779?21 Mar 2004 by R. Behrend, R. Roy, S. Sposetti, and L. Bernasconi based on lightcurve observations
(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
(6611) 1993 VW1.6960.4851.8?3??
(11066) Sigurd1.3910.3753.5?reported in Dec 2004 by L. Benner et ali based on radar observations indicating a contact binary shape
(11116) 1999 EK2.1960.226?reported Aug 2006 by Ondrejov Observatory based on lightcurve observations
(14402) 1991 DB1.7160.4020.7???
(15350) Haganuma2.3790.27711?22??
(20000) Varuna
(=2000 WR106)
43.2330.052980suggested in 2002 based on lightcurve
(32939) 1995 QY939.4730.260140???suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(33128) 1998 BU4833.3960.383160???suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(47932) 2000 GN17139.7150.288280???suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude
(89355) 2001 VS781.7870.3083???
(90377) Sedna
(=2003 VB12)
531.70.8571700?suggested in 2004 by M. Brown et al. based on long rotation period; long rotation period since refuted
2004 RZ1642.5590.6150.6???

Principal sources:


© 2002-2005, 2006 by Wm. Robert Johnston.
Last modified 24 October 2006.
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