Contact Binary Asteroids, TNOs, Comets, and Satellites

compiled by Wm. Robert Johnston
last updated 2 August 2026

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 160 known and suspected contact binary solar system objects: 96 near-Earth asteroids, 1 Mars-crossing asteroid, 23 main belt asteroids, 1 asteroid satellite, 2 Jupiter trojan asteroids, 4 Saturn satellites, 25 trans-Neptunian objects, and 8 comets. "Method" column indicates method used to determine shape; "morphology" column indicates reported comments on shape.

Contact binary identifications here include determinations based on morphology alone, i.e. are not restricted to bilobated shapes in rotational equilibrium. For example, Selam, the satellite of (152830) Dinkinesh, has a bilobated shape but is not in rotational equilibrium.

Of the 160 objects listed, 80 are considered confirmed and 80 unconfirmed. In general those identified by imagery or radar are confident while those identified by lightcurve or other methods are unconfirmed.

This table does not include a number of asteroids that are known or suggested to be genuine binaries, with two distinct components but with very small separations. These include:

objectdynamical
type		statuseffective
diameter (km)		dimensions (km)rotation
period (h)		morphologydetection
method		date
reported		sourceknown or suspected
companions;
other notes
numbernameprov. des.ABC
12Victoria main belt asteroidunconfirmed116140116968.6599 radar1995 NovM95a, V21b1 suggested
44Nysa main belt asteroidconfirmed7611367656.421417trilobated?lightcurve, AO imagery2002 MarK02a, M26a, M26d1 known
92Undina main belt asteroidunconfirmed121~130~110 15.941bifurcatedradar2012 MarS12h, S15e 
104Klymene main belt asteroidunconfirmed137~155~120 8.984 AO imagery2006 NovM06d 
110Lydia main belt asteroidunconfirmed8399906410.927 radar2010 JulS10c, S15e 
121Hermione main belt asteroidconfirmed1872501201205.55128snowmanAO imagery2005 Jul 05M02e, M05i, D09a1 known
129Antigone main belt asteroidunconfirmed1301521241164.95717 radar/lightcurve2010 JulD95a, S10c, S15e1 suggested
201Penelope main belt asteroidunconfirmed669164493.7474bifurcatedradar/lightcurve2008 SepT03c, S15e 
206Hersilia main belt asteroidunconfirmed113   11.122 occultation2026 Jun 15L26b 
216Kleopatra main belt asteroidconfirmed11927062385.385280dog boneradar1999 Nov 13M99d, O00a, M08f, D11a, S18m, M21d2 known
234Barbara main belt asteroidunconfirmed37~41~34 26.4744 thermal2009 Apr 01D09d 
413Edburga1896 CLmain belt asteroidunconfirmed34.246292515.773 radar/lightcurve2012 MarS12h, S15e 
624Hektor1907 XMJupiter trojan asteroidunconfirmed1844161311206.92051dumbbelllightcurve1978 DecH78a, S05a, M06c, D15a1 known
678Fredegundis1909 FSmain belt asteroidunconfirmed40~45~35 11.6162 radar2008 SepS08d 
758Mancunia1912 PEmain belt asteroidunconfirmed89~98~81 12.7253 radar2010 JulS10c 
779Nina1914 UBmain belt asteroidunconfirmed81~89~74 11.186dubious?radar2010 JulS10c, S15e 
887Alinda1918 DBAmor asteroidunconfirmed4.85.34.3?73.96 radar2025 JanB26f, B25r 
1333Cevenola1934 DAmain belt asteroidunconfirmed16~25~10 4.8793 lightcurve2012 Oct 02M12c 
1748Mauderli1966 RAmain belt asteroidunconfirmed45   6.003 lightcurve2020 DecM21a, R21a 
1981Midas1973 EAApollo asteroidconfirmed1.83.41.91.35.222bilobatedradar2018 Apr 02B18r, B21n, M22b 
2063Bacchus1977 HBApollo asteroidconfirmed0.671.110.530.5014.8756 radar1997 JulB97b, B99a, R19b, C25b, P25c 
2078Nanking1975 ADMars-crossing asteroidunconfirmed4.6   6.473 lightcurve2018 OctK18a 
2572Annschnell1950 DLmain belt asteroidunconfirmed3.4~4.9~2.4 6.32996 lightcurve2025 MarH25e 
3169Ostro1981 LAmain belt asteroidunconfirmed5.24.61.71.66.509 lightcurve2007 Apr 04D07b1 known
3544Borodino1977 RD4main belt asteroidunconfirmed8.5~12~6 5.43456 lightcurve2020 Mar 22B20a 
3623Chaplin1981 TG2main belt asteroidunconfirmed11~19~7 8.361 lightcurve2012 Oct 02M12c 
3752Camillo1985 PAApollo asteroidconfirmed2.33.71.2 37.846bilobatedradar2018 Feb 21B18r, V22a 
4179Toutatis1989 ACApollo asteroidconfirmed2.44.352.221.84128.808bilobatedradar1993 Jan 04H95a, B15kvisited by Chang'e 2 spacecraft
4450Pan1987 SYApollo asteroidconfirmed1.0~1.3~0.7 56.48 radar2008 SepB08g, B16d 
4486Mithra1987 SBApollo asteroidconfirmed1.852.351.651.4467.5 radar2000 OctO00b, B10c, R19b, C25b 
4769Castalia1989 PBApollo asteroidconfirmed1.081.61.00.74.095bilobatedradar1989 Nov 21O90a, R19b, C25b 
5836 1993 MFAmor asteroidunconfirmed2.8~3.8~2.0 4.9543 lightcurve2017 JunW17c 
8567 1996 HW1Amor asteroidconfirmed2.03.781.641.498.7624bifurcatedradar2009 SepM11f 
11066Sigurd1992 CC1Apollo asteroidconfirmed2.84.2~2~28.4958 radar2004 DecB04f, B12g, C25b 
13553Masaakikoyama1992 JEAmor asteroidunconfirmed2.94.41.9 97.2 radar2022 Sep 22V22a 
19521Chaos1998 WH24TNO/cubewanounconfirmed~560     occultation2023 Jul 11G23a 
25143Itokawa1998 SF36Apollo asteroidconfirmed0.3240.5350.2940.20912.13237bilobatedSC imagery2005 SepD06bexplored by Hayabusa spacecraft
26308 1998 SM165TNO/1:2 resonanceunconfirmed270~350~210 8.4 lightcurve2004 MayS04a, S04d1 known
35420 1998 AG6main belt asteroidunconfirmed6.6     occultation2026 Jun 15L26b 
47932 2000 GN171TNO/Plutinounconfirmed147~190~110 8.329 lightcurve2002 SepS02a 
52246Donaldjohanson1981 EQ5main belt asteroidconfirmed3.983.5 251 SC imagery2025 Apr 21K25avisited by Lucy spacecraft
52387Huitzilopochtli1993 OM7Amor asteroidconfirmed0.9~1.1~0.7 >26 radar2008 SepB08g, B16d 
66652Borasisi1999 RZ253TNO/cubewanounconfirmed130     dynamical2022 DecP23d1 known
68346 2001 KZ66Apollo asteroidconfirmed0.801.510.640.784.9860 radar2008 SepB80g, B16d, Z21a 
85989 1999 JD6Aten asteroidconfirmed1.462.931.261.057.66435peanutradar2014 SepW14f, M15a, D24a 
85990 1999 JV6Apollo asteroidconfirmed0.440.730.370.356.53678bilobatedradar2016 Jan 13B16d, B16g, R19a 
90403 2003 YE45Apollo asteroidconfirmed0.571.00.520.52505bilobatedradar2022 Sep 22V22a 
96590 1998 XBAten asteroidunconfirmed0.9~1.4~0.6 520 radar2016 Dec 09B17h 
98943Torifune2001 CC21Apollo asteroidconfirmed0.460.610.36 5.02124 lightcurve2024 Jul 17F24bvisited by Hayabusa 2 spacecraft
99942Apophis2004 MN4Aten asteroidunconfirmed0.310.430.300.2630.56bifurcatedradar2015 NovB15i, B18t 
118378 1999 HT11TNOunconfirmed~130~170~105 >3.5 lightcurve2023 Dec 13T23a, T24a 
126719 2002 CC249TNOunconfirmed~160~230~110 11.87 lightcurve2017 Oct 29T17c 
137126 1999 CF9Apollo asteroidconfirmed<1.0~1.5~0.7 6.7037 radar2014 AugB15h, B21p, P25c 
138175 2000 EE104Apollo asteroidunconfirmed~0.130.24~0.12~0.0813.948 radar2000 AprB26g, H01a, B23aa 
141593 2002 HK12Apollo asteroidconfirmed0.50.690.41 12.69 radar2008 SepB08g, B15h, V22a 
143404 2003 BD44Apollo asteroidconfirmed1.1~1.5~0.7 78.64 radar2019 OctB17h, L19a 
144411 2004 EW9Apollo asteroidconfirmed1.7~3.2~0.9 49.94 radar2013 JunB16d 
152637 1997 NC1Aten asteroidunconfirmed<1.0    bifurcatedradar2026 Jun 27B26h 
152664 1998 FW4Apollo asteroidconfirmed0.3~0.36~0.25 17.38 radar2011 MayB16d, B21p 
152830 ISelam(1999 VD57)main belt asteroid moonconfirmed0.280.520.220.2152.7bilobatedSC imagery2023 Nov 03K23b, L24dsatellite of Dinkinesh; visited by Lucy spacecraft
153201 2000 WO107Aten asteroidconfirmed0.501.120.420.365.017 radar2020B20a, B20i, K25b 
163696 2003 EB50Apollo asteroidconfirmed1.62~2.8~0.9 62.06peanutradar2015 Dec 09B16d 
163899 2003 SD220Aten asteroidunconfirmed1.72.71.1 285batata-likeradar2023 AugW16m, B19j, B23z 
164400 2005 GN59Apollo asteroidconfirmed0.61.10.35 38.69bilobatedradar2009 SepT09c 
179806 2002 TD66Apollo asteroidconfirmed0.3~0.5~0.2 9.455 radar2008 SepB08g, B16d, B21p 
192642 1999 RD32Apollo asteroidunconfirmed5~5.7~4.4 17.08 radar2012 MarB12h, B16d, B21p 
231937 2001 FO32Apollo asteroidunconfirmed~0.71.2~0.5~0.539.905peanutradar2021 AprB21n 
242643 2005 NZ6Apollo asteroidconfirmed2.0~2.6~1.5 7 radar2014 AugB15h 
271480 2004 FX31Apollo asteroidunconfirmed0.7~0.9~0.6 77.1 radar2023 AugW21g, B23z 
275677 2000 RS11Apollo asteroidconfirmed0.550.760.700.584.444 radar2014 MarB14l, B15h, B15j 
297418 2000 SP43Aten asteroidunconfirmed0.41~0.7~0.35~0.36.312233 lightcurve2026 Jan 21R26a 
348306 2005 AY28Aten asteroidconfirmed0.09~0.16~0.05 6.292 radar2014 FebB15h 
349507 2008 QYApollo asteroidconfirmed~0.4~0.5~0.3 12.22bifurcatedradar2023 OctB23x 
363505 2003 UC20Aten asteroidunconfirmed1.88~2.8~1.2?29.6 radar B26f, B23ab 
367789 2011 AG5Apollo asteroidunconfirmed0.250.50.15 9.4358bilobatedradar2023 Feb 13B23f, N23b, P25c 
385446Manwe2003 QW111TNO/4:7 resonanceunconfirmed160~200~130 11.8819 dynamical2020 JanG14a, T19c, R20d1 known
385458 2003 SP317TNO/cubewanounconfirmed~170~310~140~12012.39 lightcurve2024 Feb 07T24a 
388188 2006 DP14Apollo asteroidconfirmed0.260.530.240.195.7860peanutradar2014 FebJ14a, C25b 
398188Agni2010 LE15Aten asteroidconfirmed0.460.500.33 21.99bilobatedradar2014 AugB15h, V22a 
413260 2003 TL4Aten asteroidconfirmed0.31~0.5~0.2 27.2 radar2016 Oct 12B17h 
418135 2008 AG33Apollo asteroidconfirmed~0.25>0.33~0.18 18bifurcatedradar2022 AprB22t 
434709 2006 CJ69TNOunconfirmed~120~170~100~10023.39 lightcurve2023 Dec 13T23a, T24a 
436774 2012 KY3Apollo asteroidconfirmed0.4~0.5~0.3   radar2023 Apr 12B23v 
438661 2008 EP6Apollo asteroidunconfirmed0.31   5 radar2017 FebB16d 
438908 2009 XOApollo asteroidunconfirmed0.180.18~0.16 13.45 radar2024 OctM24b 
439437 2013 NK4Apollo asteroidconfirmed~0.5~0.6~0.4 196.3 radar2024 Apr 15B24k 
443880 2001 UZ16Apollo asteroidunconfirmed0.23~0.36~0.15 13.719 radar2015 Sep 14B16d 
462959 2011 DUApollo asteroidconfirmed0.20.34  10.331bifurcatedradar2016 Oct 12B17h, B21p, B25h 
481394 2006 SF6Aten asteroidunconfirmed0.24>0.370.15 11.4876 radar2020 Oct 02Z20a, V22a 
481817 2008 UL90Atira asteroidunconfirmed~0.6     radar2016 Dec 15B17h 
486958Arrokoth2014 MU69TNO/cubewanoconfirmed1735201015.938bilobated and lenticularoccultation, imaging2017 Aug 03N17a, S19a, C25bvisited by New Horizons spacecraft
494999 2010 JU39Aten asteroidunconfirmed0.13>0.16~0.1 30.2 radar2022 Sep 22V22a 
496817 1989 VBApollo asteroidunconfirmed~0.3~0.5~0.2 14.533 radar2017 Oct 03B17h 
503941 2003 UV11Apollo asteroidconfirmed0.260.4~0.2 18.25 radar2011 MayB11e, B16d 
511684 2015 BN509Apollo asteroidconfirmed0.32~0.5~0.2 5.6713 radar2017 Feb 06B17h 
523804 2000 YF29Apollo asteroidconfirmed0.1960.30.20.156.1 radar2008 SepB08g, B12g, C25b 
524522Zoozve2002 VE68Aten asteroidunconfirmed~0.23~0.34~0.15 13.50 lightcurve2011 MayB11d 
524594 2003 NW1Apollo asteroidconfirmed0.490.70.35 37.7 radar2022 Sep 22V22a 
525268 2004 XL14Aten asteroidconfirmed0.210.30.20.1417.0 radar2008 SepB08g, B12g, C25b 
531074 2012 DX98TNO/resonantunconfirmed~130~170~100 20.8 lightcurve2019 Apr 03T19c, T22a 
531917 2013 BN82TNOunconfirmed~170~260~140~14018.22 lightcurve2023 Dec 13T23a, T24a 
532039 2013 FR28TNO/resonantunconfirmed~120~220~90~9013.97 lightcurve2019 Apr 03T19c, T24a 
533562 2014 JQ80TNO/Plutinounconfirmed~165~230~120 12.16 lightcurve2018 Apr 25T18a 
535988 2015 BU518TNO/resonantunconfirmed~120     lightcurve2023 AugT23a 
543734 2014 OL394TNOunconfirmed~105~130~90 >4 lightcurve2023 Dec 13T23a, T24a 
554292 2012 TC24Jupiter trojan asteroidunconfirmed~8     lightcurve2018 Jan 09D18a, T24a 
578992 2014 JL80TNO/Plutinounconfirmed~160~210~130 34.87 lightcurve2018 Apr 25D18a, T18a 
609221 2004 VC131TNO/cubewanounconfirmed~205~270~160 15.7 lightcurve2019 Apr 03T18a, T19c 
612342 2002 FCApollo asteroidconfirmed0.7   >40 radar2008 SepB08g, B15g, B15h 
612620 2003 SQ317TNO/Haumea familyunconfirmed~93~140~60 7.210 lightcurve2013 Sep 06L13a 
612813 2004 RF84Apollo asteroidconfirmed2.2   >300 radar2008 SepB08g, B15g, B15h 
612891 2004 TT357TNO/2:5 resonanceunconfirmed~98~140~70 7.79 lightcurve2017 Jul 31T17d 
612929 2005 CR37Apollo asteroidconfirmed1.01.80.80.85.6bifurcatedradar2005 AugB05f, B06f 
671294 2014 JO25Apollo asteroidconfirmed0.81.310.67 4.5286peanutradar2017 Apr 17A17e, I17a, N17b 
723136 2006 NLAmor asteroidconfirmed0.4~0.7~0.25 6.503 radar2020 Jul 13B20j, B21p 
813899 2007 VD12Apollo asteroidconfirmed0.3~0.4~0.23 7.418 radar2008 SepB08g, B16d 
837253 2013 FW13Apollo asteroidunconfirmed0.1    bifurcatedradar2024 SepB24p 
853358 2009 DL46Apollo asteroidconfirmed0.1~0.16~0.06 42.26 radar2017 JanB17h, B21p 
  1997 QK1Apollo asteroidconfirmed~0.18>0.22~0.15 4.469bifurcatedradar2025 Aug 19B25l 
  2002 AY1Aten asteroidconfirmed0.2~0.2~0.1 9bifurcatedradar2014 AugB15h, B21p, B24l 
  2002 NY40Apollo asteroidconfirmed0.60.8~0.5 19.982 radar2008 SepR07d, B08g, T12d, P25c 
  2003 AF23Aten asteroidunconfirmed0.78   19.89 radar2021 Jan 04T16a 
  2004 MU8TNO/cubewanounconfirmed~180~220~140 >2.5 lightcurve2019 Apr 03T19c, G19c1 known
  2004 SC60TNOunconfirmed~140~210~120~12058.09 lightcurve2023 Dec 13T23a, T24a1 known
  2004 VE131TNOunconfirmed~110~140~90 >8 lightcurve2023 Dec 13T23a, T24a 
  2004 VU75TNO/cubewanounconfirmed~160~190~130 >3 lightcurve2019 Apr 03T19c 
  2005 TF49Apollo asteroidunconfirmed~0.7   >20 radar2018 Aug 29B21p 
  2006 WBAten asteroidconfirmed~0.140.240.08 >10bilobatedradar2024 Nov 23B24u 
  2007 TU24Apollo asteroidconfirmed0.3~0.5~0.2 26 radar2008 Jan 28B16d, B21p 
  2008 SV11Apollo asteroidconfirmed0.40.60.3 32.4bilobatedradar2009 SepT09c, B16d 
  2010 GT7Apollo asteroidconfirmed0.240.320.22 ~16 radar2022 Sep 22V22a 
  2012 MS4Apollo asteroidconfirmed0.370.480.26 <42 radar2022 Sep 22V22a 
  2012 QG42Apollo asteroidunconfirmed0.2~0.3~0.1 24.22 radar2012 SepB16d, B21p 
  2013 JB36Amor asteroidconfirmed~0.24     radar2013 DecH13c 
  2013 JR28Apollo asteroidconfirmed0.10.1  >10 radar2014 JulB15g, B15h 
  2013 US3Apollo asteroidunconfirmed~0.16~0.3~0.1 450 radar2018 Apr 26W18a 
  2014 HQ124Aten asteroidconfirmed0.3>0.40.2 >16peanutradar2014 Jun 12B14n, J14b, B15h 
  2014 JO80TNO/Plutinounconfirmed~140~190~110 6.32 lightcurve2018 Apr 25T18a 
  2014 UF206Amor asteroidconfirmed1.39~1.5~1.3 6.83 radar2015 Mar 31B15h 
  2015 JD1Apollo asteroidconfirmed0.150.200.11 5.2057 radar2020 OctL20b, L22a, V22a, P25c 
  2017 BWApollo asteroidconfirmed0.05~0.06~0.04 14.559bifurcatedradar2017 FebB17g, B17h 
  2017 DA120Apollo asteroidunconfirmed~0.36~0.7~0.2   lightcurve2023 Apr 18D23c 
  2021 LD1Apollo asteroidconfirmed1.2>1.2  >9.2 radar2021 JulB21o, B23z 
  2022 RM4Apollo asteroidunconfirmed~0.35???? radar2025B26g 
  2024 JV33Apollo asteroidconfirmed~0.20.300.15 ~7peanutradar2024 AugB24m, J24b 
  2024 ONApollo asteroidconfirmed~0.20.35~0.1 6.0116peanutradar2024 Sep 17J24a 
  2025 BC10Apollo asteroidconfirmed~0.4~0.6~0.25 6bowling pinradar2025 Apr 05B25h 
  2025 FA22Apollo asteroidconfirmed0.180.32~0.20~0.1013.0737bifurcatedradar2026 Apr 17T26a 
1PHalleyP/1682 Q1Halley family cometconfirmed10.215.18.07.7176.5peanutSC imagery1986 MarS91b, S15ivisited by multiple spacecraft
8PTuttleP/1858 A1Jupiter family cometconfirmed5.210.04.114.1111.385bilobatedradar2008 Jul 14H08c, H10b 
19PBorrellyP/1904 Y2Jupiter family cometconfirmed4.48~3 25 SC imagery2001 SepS02b, S04dvisited by Deep Space 1 spacecraft
45PHonda-Mrkos-PajdusakovaP/1948 X1Jupiter family cometconfirmed1.25~1.4~1.1 <7.2 radar2017 FebL99a, L17a, U17a 
67PChuryumov-GerasimenkoP/1969 R1Jupiter family cometconfirmed3.2884.103.523.2712.76137rubber duckySC imagery2014 JulS15f, J16bexplored by Rosetta spacecraft
103PHartley 2P/1986 E2Jupiter family cometconfirmed1.162.320.740.7218.198bilobatedradar2010 Oct 28H10f, H11c, T13b, R19bvisited by EPOXI spacecraft
311PPANSTARRS 23P/2013 P5Jupiter family cometunconfirmed0.38~0.44~0.33   dust emissions2014 Jan 22H14c, J18a 
331P-AGibbs 14P/2012 F5-Acomet/active asteroidunconfirmed0.8~0.9~0.9~0.73.26symmetriclightcurve2021 Nov 18J21a 
S XXIVKiviuqS/2000 S5Saturn satelliteunconfirmed~15~23~10 22.0 lightcurve2018 NovD18bobserved by Cassini spacecraft
S XXVIIIErriapusS/2000 S10Saturn satelliteunconfirmed~9~12~8 28.2 lightcurve2018 NovD18bobserved by Cassini spacecraft
S XXXVIIBebhionnS/2004 S11Saturn satelliteunconfirmed~5~6~4 16.33 lightcurve2018 NovD18bobserved by Cassini spacecraft
S XXXIXBestlaS/2004 S18Saturn satelliteunconfirmed~6~8~5 14.6238 lightcurve2018 NovD18bobserved by Cassini spacecraft
objectdynamical
type		statuseffective
diameter (km)		dimensions (km)rotation
period (h)		morphologydetection
method		date
reported		sourceknown or suspected
companions;
other notes
numbernameprov. des.ABC

Specific sources: see this page.

General sources:

© 2002-2025, 2026 by Wm. Robert Johnston.
Last modified 2 August 2026.
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