Contact Binary Asteroids, TNOs, and Comets
compiled by Wm. Robert Johnston
last updated 15 April 2023
Of those asteroids for which shapes have been determined, a number have bilobated or contact binary shapes. These objects likely relate to true binary asteroids (i.e. with physically separated components) in origin.
The following table lists known and suspected contact binary solar system objects: 83 asteroids, 14 trans-Neptunian objects, and 7 comets. "Method" column indicates method used to determine shape; "morphology" column indicates shapes other than strict contact binary. Sources regarding shape are listed below the table, along with other sources (e.g., for rotation periods).
This table does not include a number of asteroids that are known or believed to be genuine binaries, with two distinct components, but with very small separations. These include: near-Earth asteroids (5143) Heracles, (363027) 2000 CO101, (374851) 2006 VV2, and (488453) 1994 XD; main belt asteroid (11264) Claudiomaccone; Jupiter trojans (17365) 1978 VF11 and (29314) Eurydamas; and trans-Neptunian object (139775) 2001 QG298.
asteroid | dynamical type | dimensions (km) | rotation period (h) | method | morphology | year reported | source |
---|
number | name | prov. des. | A | B | C |
92 | Undina | | main belt asteroid | 126 | | | 15.941 | radar | | 2010 | S15a |
110 | Lydia | | main belt asteroid | 86 | | | 10.927 | radar | | 2008 | S15a |
121 | Hermione | | main belt asteroid | 250 | 120 | 120 | 5.55128 | AO imagery | | 2005 | M05a |
129 | Antigone | | main belt asteroid | 113 | | | 4.9572 | radar/lightcurve | | 2010 | S15a |
201 | Penelope | | main belt asteroid | 105 | 72 | 62 | 3.7474 | radar/lightcurve | | 2015 | S15a |
216 | Kleopatra | | main belt asteroid | 217 | 94 | 81 | 5.385 | radar | "dog bone" | 2000 | O00a |
413 | Edburga | 1896 CL | main belt asteroid | 46 | 29 | 25 | 15.773 | radar/lightcurve | | 2015 | S15a |
624 | Hektor | 1907 XM | Jupiter trojan | 363 | 207 | 207 | 6.924 | lightcurve | | 1978 | H78a |
678 | Fredegundis | 1909 FS | main belt asteroid | 40 | | | 11.61624 | radar | | 2008 | S08a |
758 | Mancunia | 1912 PE | main belt asteroid | 90 | | | 12.7253 | radar | | 2006 | S10a |
779 | Nina | 1914 UB | main belt asteroid | 81 | | | 11.186 | radar | | 2008 | S15a |
1981 | Midas | 1973 EA | Apollo asteroid | 3.4 | 1.9 | 1.3 | 5.222 | radar | bilobated | 2018 | B18a, B21a, M22a |
2063 | Bacchus | 1977 HB | Apollo asteroid | 1.11 | 0.53 | 0.50 | 14.904 | radar | | 1998 | B99a |
3169 | Ostro | 1981 LA | main belt asteroid | 4.6 | 1.7 | 1.6 | 6.503 | lightcurve | | 2007 | D07a |
3752 | Camillo | 1985 PA | Apollo asteroid | 2.3 | | | 37.846 | radar | | 2018 | B18a |
4179 | Toutatis | 1989 AC | Apollo asteroid | 4.6 | 2.29 | 1.92 | 176 | radar | bilobated | 1992 | H95a |
4450 | Pan | 1987 SY | Apollo asteroid | 1 | | | 56.48 | radar | | 2008 | B16a |
4486 | Mithra | 1987 SB | Apollo asteroid | 2.35 | 1.65 | 1.44 | 67.5 | radar | | 2000 | B10a |
4769 | Castalia | 1989 PB | Apollo asteroid | 1.7 | 1 | 1 | 4.095 | radar | | 1990 | O90a |
5836 | | 1993 MF | Amor asteroid | | | | 4.9543 | lightcurve | | 2017 | B17a |
8567 | | 1996 HW1 | Amor asteroid | 3.78 | 1.64 | 1.49 | 8.76243 | radar | | 2011 | M11b |
11066 | Sigurd | 1992 CC1 | Apollo asteroid | 4.2 | ~2 | ~2 | 8.4958 | radar | | 2004 | B12a |
13553 | Masaakikoyama | 1992 JE | Amor asteroid | ~2 | 0.8 | | 58 | radar | | 2022 | V22a |
25143 | Itokawa | 1998 SF36 | Apollo asteroid | 0.535 | 0.294 | 0.209 | 12.132 | SC imagery | bilobated | 2005 | D06a |
47932 | | 2000 GN171 | TNO/Plutino | 147 | | | 8.329 | lightcurve | | 2017 | S02a |
52387 | Huitzilopochtli | 1993 OM7 | Amor asteroid | 1.22 | | | >26 | radar | | 2003 | B16a |
68346 | | 2001 KZ66 | Apollo asteroid | 1.51 | 0.64 | 0.78 | 4.98599 | radar | | 2003 | B16a, Z21a |
85989 | | 1999 JD6 | Aten asteroid | 1.8 | | | 7.6638 | radar | "peanut" | 2014 | W14a |
85990 | | 1999 JV6 | Apollo asteroid | 0.73 | 0.37 | 0.35 | 6.53678 | radar | bilobated | 2016 | B16a, R19a |
90403 | | 2003 YE45 | Apollo asteroid | 1 | 0.5 | 0.5 | 505 | radar | bilobated | 2022 | V22a |
96590 | | 1998 XB | Aten asteroid | 0.9 | | | 520 | radar | | 2017 | B17a |
99942 | Apophis | 2004 MN4 | Aten asteroid | 0.43 | 0.30 | 0.26 | 30.56 | radar | | 2015 | B15b |
126719 | | 2002 CC249 | TNO | ~210 | | | 11.87 | lightcurve | | 2017 | T17a |
137126 | | 1999 CF9 | Apollo asteroid | 0.9 | | | 6.7 | radar | | 2013 | B15a |
141593 | | 2002 HK12 | Apollo asteroid | 0.6 | | | 12.69 | radar | | 2002 | B15a |
143404 | | 2003 BD44 | Apollo asteroid | | | | 78.64 | radar | | 2017 | B17a |
144411 | | 2004 EW9 | Apollo asteroid | 2 | 1 | 1 | 49.94 | radar | | 2012 | B16a |
152664 | | 1998 FW4 | Apollo asteroid | 0.3 | | | 17.38 | radar | | 2009 | B16a |
153201 | | 2000 WO107 | Aten asteroid | 0.82 | 0.38 | | 5.022 | radar | | 2020 | B20a |
163696 | | 2003 EB50 | Apollo asteroid | | | | 62.06 | radar | "peanut" | 2015 | B16a |
179806 | | 2002 TD66 | Apollo asteroid | 0.3 | | | 9.455 | radar | | 2008 | B16a |
192642 | | 1999 RD32 | Apollo asteroid | 6 | | | 17.08 | radar | | 2012 | B16a |
231937 | | 2001 FO32 | Apollo asteroid | 1.2 | ~0.5 | ~0.5 | 39.905 | radar | "peanut" | 2021 | B21a |
242191 | | 2003 NZ6 | Aten asteroid | 0.6 | 0.3 | 0.3 | 13.531 | radar | | 2015 | B16a |
242643 | | 2005 NZ6 | Apollo asteroid | 1.99 | | | >10 | radar | | 2013 | B15a |
275677 | | 2000 RS11 | Apollo asteroid | 0.698 | 0.578 | 0.758 | 4.444 | radar | | 2014 | B15a |
348306 | | 2005 AY28 | Aten asteroid | 0.2 | | | 6.292 | radar | | 2014 | B15a |
367789 | | 2011 AG5 | Apollo asteroid | 0.5 | 0.15 | | 9.44 | radar | bilobed | 2022 | B23a, N23a |
385446 | Manwe | 2003 QW111 | TNO/resonant | 142 | | | 11.8819 | lightcurve | | 2017 | T19a |
388188 | | 2006 DP14 | Apollo asteroid | 0.4 | 0.2 | 0.2 | 5.77 | radar | | 2014 | J14a |
398188 | Agni | 2010 LE15 | Aten asteroid | 0.44 | | | 21.99 | radar | | 2015 | B15a |
413260 | | 2003 TL4 | Aten asteroid | 0.4 | | | 27.2 | radar | | 2017 | B17a |
418135 | | 2008 AG33 | Apollo asteroid | 0.33 | | | | radar | | 2022 | B22a |
436774 | | 2012 KY3 | Apollo asteroid | ~0.4 | ~0.25 | | | radar | | 2023 | B23b |
438661 | | 2008 EP6 | Apollo asteroid | 0.4 | | | 5 | radar | | 2016 | B16a |
443880 | | 2001 UZ16 | Apollo asteroid | 0.4 | | | 13.719 | radar | | 2016 | B16a |
462959 | | 2011 DU | Apollo asteroid | 0.2 | | | 10.290 | radar | | 2017 | B17a |
481394 | | 2006 SF6 | Aten asteroid | 0.32 | 0.12 | | 11.4876 | radar | | 2020 | Z20a, V22a |
481817 | | 2008 UL90 | Atira asteroid | ~0.6 | | | | radar | | 2017 | B17a |
486958 | Arrokoth | 2014 MU69 | TNO/cubewano | 35 | 20 | 10 | 15.918 | occultation, imaging | bilobed and lenticular | 2017 | S19a |
494999 | | 2010 JU39 | Aten asteroid | >0.16 | ~0.1 | | 30.2 | radar | | 2022 | V22a |
496817 | | 1989 VB | Apollo asteroid | 0.4 | | | 14.533 | radar | | 2017 | B17a |
503941 | | 2003 UV11 | Apollo asteroid | 0.4 | | | 18.25 | radar | | 2010 | B16a |
511684 | | 2015 BN509 | Apollo asteroid | 0.3 | | | 5.6713 | radar | | 2017 | B17a |
523804 | | 2000 YF29 | Apollo asteroid | 0.4 | | | <12 | radar | | 2001 | B12a |
524594 | | 2003 NW1 | Apollo asteroid | 0.7 | 0.35 | | 37.7 | radar | | 2022 | V22a |
525268 | | 2004 XL14 | Aten asteroid | 0.3 | | | 24 | radar | | 2006 | B12a |
531074 | | 2012 DX98 | TNO/resonant | ~150 | | | 20.8 | lightcurve | | 2019 | T19a, T22a |
532039 | | 2013 FR28 | TNO/resonant | ~150 | | | | lightcurve | | 2019 | T19a |
533562 | | 2014 JQ80 | TNO/Plutino | ~165 | ~83 | ~63 | 12.16 | lightcurve | | 2018 | T18a |
554292 | | 2012 TC24 | Jupiter trojan | ~7 | | | | lightcurve | | 2018 | D18a |
578992 | | 2014 JL80 | TNO/Plutino | ~170 | | | 34.87 | lightcurve | | 2018 | T18a |
609221 | | 2004 VC131 | TNO/cubewano | ~260 | | | 15.7 | lightcurve | | 2019 | T19a |
612342 | | 2002 FC | Apollo asteroid | 0.7 | | | >40 | radar | | 2002 | B15a |
612620 | | 2003 SQ317 | TNO/Haumea family | ~380 | ~190 | ~180 | 7.210 | lightcurve | | 2017 | L13a |
612813 | | 2004 RF84 | Apollo asteroid | 2.4 | | | >300 | radar | | 2005 | B15a |
612891 | | 2004 TT357 | TNO/2:5 resonance | ~140 | ~70 | ~50 | 7.79 | lightcurve | | 2017 | T17b |
612929 | | 2005 CR37 | Apollo asteroid | 1.8 | 0.8 | 0.8 | 5.6 | radar | | 2006 | B06a |
| | 2002 AY1 | Aten asteroid | ~0.2 | | | 8 | radar | | 2013 | B15a |
| | 2002 NY40 | Apollo asteroid | 0.4 | | | 19.98 | radar | | 2002 | T12a |
| | 2004 MU8 | TNO/cubewano | ~280 | | | >2 | lightcurve | | 2019 | T19a |
| | 2004 VU75 | TNO/cubewano | ~200 | | | >3 | lightcurve | | 2019 | T19a |
| | 2007 TU24 | Apollo asteroid | 0.3 | | | 26 | radar | | 2008 | B16a |
| | 2007 VD12 | Apollo asteroid | 0.5 | | | 7.418 | radar | | 2007 | B16a |
| | 2008 SV11 | Apollo asteroid | 0.8 | | | 32.4 | radar | | 2009 | B16a |
| | 2009 DL46 | Apollo asteroid | 0.1 | | | 42.26 | radar | | 2017 | B17a |
| | 2010 GT7 | Apollo asteroid | 0.32 | 0.22 | | ~16 | radar | | 2022 | V22a |
| | 2012 MS4 | Apollo asteroid | 0.48 | 0.25 | | <42 | radar | | 2022 | V22a |
| | 2012 QG42 | Apollo asteroid | 0.25 | | | 24.22 | radar | | 2013 | B16a |
| | 2013 JB36 | Amor asteroid | ~0.25 | | | | radar | | 2013 | H13a |
| | 2013 JR28 | Apollo asteroid | 0.1 | | | >10 | radar | | 2013 | B15a |
| | 2014 HQ124 | Aten asteroid | 0.325 | | | 20 | radar | | 2014 | B15a |
| | 2014 JO25 | Apollo asteroid | 0.87 | 0.65 | | 4.5 | radar | | 2017 | N17b |
| | 2014 JO80 | TNO/Plutino | ~113 | ~66 | ~47 | 6.32 | lightcurve | | 2018 | T18a |
| | 2014 UF206 | Amor asteroid | 1 | | | 6.83 | radar | | 2015 | B15a |
| | 2015 JD1 | Apollo asteroid | 0.15 | 0.1 | 0.1 | 5.2116 | radar | | 2020 | L20a, L22a |
| | 2017 BW | Apollo asteroid | 0.05 | | | 14.559 | radar | | 2017 | B17a |
| | 2021 LD1 | Apollo asteroid | 1.2 | | | | radar | | 2021 | B21b |
1P | Halley | P/1682 Q1 | Halley family comet | 15.1 | 8.0 | 7.7 | 54 | SC imagery | "peanut" | 1986 | S91a |
8P | Tuttle | P/1858 A1 | Jupiter family comet | 10 | 5.75 | 4.11 | 11.385 | radar | | 2010 | H10a |
19P | Borrelly | P/1904 Y2 | Jupiter family comet | 4.4 | 1.8 | | 26 | SC imagery | | 2002 | S04a |
45P | Honda-Mrkos-Pajdusakova | P/1948 X1 | Jupiter family comet | 1.3 | | | 7.6 | radar | | 2017 | U17a |
67P | Churyumov-Gerasimenko | P/1969 R1 | Jupiter family comet | 4.1 | 4.1 | 3.3 | 12.4043 | SC imagery | "rubber ducky" | 2014 | S15b |
103P | Hartley 2 | P/1986 E2 | Jupiter family comet | 2.3 | ~0.8 | | 18.236 | SC imagery | bi-lobed | 2011 | H11a, T13a |
331P-A | Gibbs 14 | P/2012 F5-A | comet/active asteroid | 0.8 | | | 3.26 | lightcurve | symmetric | 2021 | J21a |
Sources:
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- T17b: Thirouin, A., S. S. Sheppard, and K. S. Noll, 2017, 2004 TT357: A potential contact binary in the trans-Neptunian belt, Astrophys. J., 844(2):135.
- T18a: Thirouin, A., and S. S. Sheppard, 2018, The plutino population: An abundance of contact binaries, Astron. J., forthcoming; arXiv [https://arxiv.org/abs/1804.09695].
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- Z21a: Zegmott, T. J., et al., 2021, Detection of the YORP effect on the contact binary (68346) 2001 KZ66 from combined radar and optical observations, Monthly Notices of the Royal Astronomical Society, 507(4):4914-4932.
General sources:
© 2002-2022, 2023 by Wm. Robert Johnston.
Last modified 15 April 2023.
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