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.)
designation | primary a (AU) |
primary e |
primary diameter (km) |
companion separation (km) |
companion diameter (km) |
notes |
---|---|---|---|---|---|---|
(2) Pallas | 2.773 | 0.230 | 570 x 525 x 482 | 1 | 29 May 1978 based on occulation data | |
750 | 175 | 1980 by E. Hege, W. Cocke, E. Hubbard, J. Christou, and R. Radick based on speckle interferometry; refuted by 29 May 1983 occultation observations | ||||
(6) Hebe | 2.425 | 0.202 | 190 | 900 | 20 | 5 Mar 1977 by P. D. Maley based on occultation data (nicknamed "Jebe") |
(9) Metis | 2.387 | 0.122 | 150 | 1100 | 60 | 11 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) Victoria | 2.336 | 0.220 | 110 | 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) Eunomia | 2.645 | 0.186 | 260 | 300 | 180 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data; model shown unstable in 1985 |
(18) Melpomene | 2.296 | 0.218 | 140 | 1100 | 65 | 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 | suggested 1979 by E. Tedesco as interpretation of lightcurve data | ||
(39) Laetitia | 2.771 | 0.112 | 145 x 130 x 120 | 168 | 120 x 70 x 70 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(43) Ariadne | 2.203 | 0.169 | 66 | 85 | 70 x 40 x 40 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(44) Nysa | 2.424 | 0.148 | 70 x 70 x 60 | 83 | 50 x 25 x 25 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(46) Hestia | 2.526 | 0.172 | 125 | reported 1981 by F. Scaltriti, V. Zappala, and A. W. Harris based on lightcurve data | ||
(49) Pales | 3.084 | 0.235 | 150 | reported 1979 by E. Tedesco based on lightcurve data | ||
(51) Nemausa | 2.365 | 0.067 | 150 | suggested 1979 by E. Tedesco as interpretation of lightcurve data | ||
(61) Danae | 2.982 | 0.167 | 85 x 80 x 75 | 101 | 55 x 30 x 30 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(63) Ausonia | 2.395 | 0.126 | 100 | 100 | 90 x 60 x 55 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(65) Cybele | 3.437 | 0.104 | 240 | 900 | 11 | 17 Oct 1979 by V. Rakhimov and O. Najmov at Ura-Tyube based on occultation data; see IAUC 3439 |
(82) Alkmene | 2.758 | 0.225 | 60 x 55 x 50 | 66 | 40 x 25 x 25 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(98) Ianthe | 2.685 | 0.189 | 104 | ? | ? | suggested in Apr 2004 by R. Venable based on occultation observations |
(129) Antigone | 2.866 | 0.214 | 115 | suggested 1979 by E. Tedesco as interpretation of lightcurve data by F. Scaltriti and V. Zappala | ||
(146) Lucina | 2.719 | 0.066 | 140 | 1600 | 6 | 18 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) Ophelia | 3.133 | 0.127 | 120 | reported 1979 by E. Tedesco based on lightcurve data | ||
(182) Elsa | 2.417 | 0.186 | 44 | reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period | ||
(192) Nausikaa | 2.402 | 0.248 | 100 | 150 | 50 x 40 x 40 | reported 1985 by A. Cellino, R. Pannunzio, V. Zappala', P. Farinella, and P. Paolicchi based on lightcurve data |
(216) Kleopatra | 2.792 | 0.253 | 217 x 94 x 81 | 475 | 8 | 10 Oct 1980 by G. Rattely and B. Cooke based on occultation data |
220 | 80 | 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 | ||||
(249) Ilse | 2.377 | 0.216 | 35 | reported 1987 by R. P. Binzel based on long period | ||
(280) Philia | 2.943 | 0.107 | 46 | reported 1987 by R. P. Binzel based on long period | ||
(287) Nephthys | 2.353 | 0.024 | 70 | 140 | suspected 2003 | |
(288) Glauke | 2.756 | 0.210 | 32 | 200? | 15? | reported 1983 by A. W. Harris based on long period |
(302) Clarissa | 2.405 | 0.112 | 38x64? | ~300? | 5? | reported based on occultation observations by P. Dombrowski on 24 Jun 2004 |
(349) Dembowska | 2.926 | 0.086 | 140 | suggested 1979 by E. Tedesco as interpretation of lightcurve data | ||
(354) Eleonora | 2.800 | 0.112 | 155 | suggested 1979 by E. Tedesco as interpretation of lightcurve data | ||
(361) Bononia | 3.951 | 0.213 | 142 | ? | ? | suggested 31 Jan 2002 by R. Venable |
(385) Ilmatar | 2.848 | 0.126 | 92 | reported 1989 by A. W. Harris based on long period | ||
(407) Arachne | 2.624 | 0.069 | 95 | reported 1989 by S. J. Weidenschilling based on long period | ||
(423) Diotima | 3.067 | 0.040 | 210 | 1982 by H. J. Schober from lightcurve data | ||
(433) Eros | 1.458 | 0.223 | 33 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) Rhodia | 2.386 | 0.248 | 13 | reported 1987 by R. P. Binzel based on long period | ||
(508) Princetonia | 3.159 | 0.018 | 140 | reported 1989 by A. W. Harris based on long period | ||
(532) Herculina | 2.772 | 0.178 | 230 | 975 | 45 | 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 |
(624) Hektor | 5.214 | 0.024 | 370 x 195 | 240 | 200 | reported 1971 by A. F. Cook based on light curve data suggesting a close binary; since modeled as one double-lobed object |
(709) Fringilla | 2.913 | 0.116 | 97 | reported 1984 by S. Dermott, A. W. Harris, and C. Murray based on long period | ||
(772) Tanete | 3.004 | 0.092 | 118 | ? | ? | based on occultation observations by R. Sumner and R. Nolthenius in Apr 2004; see IOTA page |
(893) Leopoldina | 3.049 | 0.150 | 75 x 64 | 170 | 54 x 24 | reported 29 Jan 1996 by EAON based on occultation data |
(944) Hidalgo | 5.754 | 0.660 | 38 | ? | ? | suggested 1979 by E. Tedesco based on lightcurve variation with solar phase angle |
(1024) Hale | 2.865 | 0.225 | 41 | ? | ? | suggested in Apr 2004 by R. Venable based on occultation observations |
(1220) Crocus (=1932 CU) |
3.007 | 0.067 | 20 | 20 | reported 1985 by R. P. Binzel based on long period | |
(1481) Tubingia (=1938 DR) |
3.016 | 0.049 | 33 | reported 1987 by R. P. Binzel based on long period | ||
(1580) Betulia (=1950 KA) |
2.197 | 0.488 | 6 | reported 1979 by E. Tedesco based on long period | ||
(1620) Geographos (=1951 RA) |
1.246 | 0.335 | 5.1 x 1.8 | 1994 by L. G. Karachkina, V. V. Prokof'eva, and V. P. Tarashchuk based on lightcurve data | ||
(1627) Ivar | 1.863 | 0.397 | 8 | ? | ? | suggested by Hoffmann and Geyer in 1990 based on lightcurve observations; single elogated object model preferred |
(1857) Parchomenko | 2.243 | 0.024 | ? | reported 7 Jun 2006 | ||
(2063) Bacchus | 1.078 | 0.349 | 1.1 x 0.5 x 0.5 | ? | ? | suggested by Ostro et al. in 1999 based on radar observations, but single bilobated object model preferred |
(2501) Lohja | 2.422 | 0.195 | 14? | |||
(2841) Puijo | 2.252 | 0.084 | 10 | ? | ? | suggested in Dec 2004 by B. Warner based on lightcurve observations |
(3155) Lee | 2.343 | 0.100 | 10 | ? | ? | suggested in Nov 2004 by W. Ryan, E. Ryan, and C. Martinez based on lightcurve |
(3169) Ostro | 1.892 | 0.067 | 10? | ? | ? | reported by Descamps et al. in Dec 2005; see CBET 320 |
(3220) Murayama | 1.840 | 0.173 | ? | ? | ? | suggested in Oct 2005 by A. Tsuchikawa, S. Miyasaka, and H. Hamanowa based on lightcurve |
(3665) Fitzgerald | 2.418 | 0.089 | 10? | |||
(3682) Welther | 2.759 | 0.319 | 19 | 33 | ? | suggested in Apr 2004 by P. Szekely et ali based on lightcurve observations |
(3782) Celle (=1986 TE) |
2.414 | 0.096 | 11 | reported 3 May 2003 based on photometric data | ||
(3868) Mendoza | 2.334 | 0.098 | 9? | ? | ? | |
(4179) Toutatis (=1989 AC) |
2.510 | 0.634 | 4.6 x 2.4 x 1.9 | 1988 based on radar observations suggesting a close binary; in 1989-1992 modeled as one double-lobed object | ||
(4197) 1982 TA | 2.301 | 0.772 | 2? | 4.4 | 2? | 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) |
2.204 | 0.661 | 2 | reported in 2000 by Ostro et ali from radar observations made July-August 2000 showing bifurcation | ||
(4492) Debussy (=1988 SH) |
2.768 | 0.177 | 9? | 21 Mar 2004 by R. Behrend, R. Roy, S. Sposetti, and L. Bernasconi based on lightcurve observations | ||
(4769) Castalia (=1989 PB) |
1.063 | 0.483 | 1.8 x 0.8 | 0.75 | 0.75 | 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 |
(6611) 1993 VW | 1.696 | 0.485 | 1.8? | 3? | ? | |
(11066) Sigurd | 1.391 | 0.375 | 3.5 | ? | reported in Dec 2004 by L. Benner et ali based on radar observations indicating a contact binary shape | |
(11116) 1999 EK | 2.196 | 0.226 | ? | reported Aug 2006 by Ondrejov Observatory based on lightcurve observations | ||
(14402) 1991 DB | 1.716 | 0.402 | 0.7? | ? | ? | |
(15350) Haganuma | 2.379 | 0.277 | 11? | 22? | ? | |
(20000) Varuna (=2000 WR106) |
43.233 | 0.052 | 980 | suggested in 2002 based on lightcurve | ||
(32939) 1995 QY9 | 39.473 | 0.260 | 140? | ? | ? | suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude |
(33128) 1998 BU48 | 33.396 | 0.383 | 160? | ? | ? | suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude |
(47932) 2000 GN171 | 39.715 | 0.288 | 280? | ? | ? | suggested in May 2004 by S. Sheppard and D. Jewitt based on long rotation period and lightcurve amplitude |
(89355) 2001 VS78 | 1.787 | 0.308 | 3? | ? | ? | |
(90377) Sedna (=2003 VB12) |
531.7 | 0.857 | 1700? | suggested in 2004 by M. Brown et al. based on long rotation period; long rotation period since refuted | ||
2004 RZ164 | 2.559 | 0.615 | 0.6? | ? | ? |
Principal sources:
© 2002-2005, 2006 by Wm. Robert Johnston.
Last modified 24 October 2006.
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