List of Solar System objects by size

This is a partial list of Solar System objects by size, arranged in descending order of mean volumetric radius, and subdivided into several size classes. These lists can also be sorted according to an object's mass and, for the largest objects, volume, density and surface gravity, insofar as these values are available. This list contains the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects.

The ordering may be different depending on whether one chooses radius or mass, because some objects are denser than others. For instance, Uranus is larger than Neptune but less massive, and although Ganymede and Titan are larger than Mercury, they have less than half Mercury's mass. This means some objects in the lower tables, despite their smaller radii, may be more massive than objects in the upper tables because they have a higher density.

Many trans-Neptunian objects (TNOs) have been discovered, and their approximate locations in this list are shown, even though there can be a large uncertainty in their measurement.

Solar System objects more massive than 10²¹ kilograms (one yottagram [Yg]) are known or expected to be approximately spherical. Astronomical bodies relax into rounded shapes (ellipsoids), achieving hydrostatic equilibrium, when the gravity of their mass is sufficient to overcome the structural strength of their material. Objects made of ice become round more easily than those made of rock, and many icy objects are spheroidal at far lower sizes. The cutoff boundary for roundness is somewhere between 100 km and 200 km in radius.^[1]

The larger objects in the mass range between 10¹⁸ kg to 10²¹ kg (1 to 1000 zettagrams [Zg]), such as Tethys, Ceres, and Mimas, have relaxed to an oblate-spheroid equilibrium due to their gravity, whereas the less massive rubble piles (e.g. Amalthea and Janus) are roughly rounded, but not spherical, dubbed "irregular".

Spheroidal bodies typically have some polar flattening due to the centrifugal force from their rotation, and can sometimes even have quite different equatorial diameters (scalene ellipsoids such as Haumea). Unlike bodies such as Haumea, the irregular bodies deviate significantly from the shape of an ellipsoid.

There can be difficulty in determining the diameter (within a factor of about 2) for typical objects beyond Saturn. (See 2060 Chiron as an example.) For TNOs there is some confidence in the diameters, but for non-binary TNOs there is no real confidence in the masses/densities. Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm³, but it is just as likely that they have a comet-like density of only 0.5 g/cm³.^[2] For example, if a TNO is poorly assumed to have a mass of 3.59×10²⁰ kg based on a radius of 350 km with a density of 2 g/cm³ and is later discovered to only have a radius of 175 km with a density of 1 g/cm³, the mass estimate would be only 2.24×10¹⁹ kg.

The sizes and masses of many of the moons of Jupiter and Saturn are fairly well known due to numerous observations and interactions of the Galileo and Cassini orbiters. But many of the moons with a radius less than ~100 km, such as Jupiter's Himalia, still have unknown masses.^[3] Again, as we get further from the Sun than Saturn, things get less clear. There has not yet been an orbiter around Uranus or Neptune for long-term study of their moons. For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center^[4] and JPL Solar System Dynamics,^[3] have somewhat contradictory size and albedo estimates depending on which research paper is being cited.

Data for objects has varying reliability including uncertainties in the figures for mass and radius, and irregularities in the shape and density, with accuracy often depending on how close it is to Earth or if it has been visited by a probe.

Graphical overview

Relative sizes of the fifty largest bodies in the Solar System, colored by orbital region. Values are diameters in kilometers.

• 

  Relative masses of the bodies of the Solar System. Objects smaller than Saturn are not visible at this scale.

• 

  Relative masses of the Solar planets. Jupiter at 71% of the total and Saturn at 21% dominate the system. Mercury is not visible at this scale.

• 

  Relative masses of the solid bodies of the Solar System. Earth at 48% and Venus at 39% dominate. Bodies less massive than Pluto are not visible at this scale.

• 

  Relative masses of the rounded moons of the Solar System. Mimas, Enceladus, and Miranda are too small to be visible at this scale. Here, the Moon is labeled "Luna".

List of objects by radius

Larger than 400 km

It was once expected that any icy body larger than approximately 200 km in radius was likely to be in hydrostatic equilibrium (HE).^[5] However, Rhea is the smallest body where detailed measurements have been made and are consistent with hydrostatic equilibrium,^[6] whereas Iapetus is the largest determined not to be in hydrostatic equilibrium,^[7] bracketing a radius of 750 km.

For simplicity and comparative purposes, the values are manually calculated assuming a sphericity of 1. The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets, the "radius" is the point at which the atmosphere reaches 1 bar of atmospheric pressure.^[8] The radius of Saturn's main rings is 136,775 km.

Body ^(a)	Image	Radius ^(b)		Volume		Mass		Density	Gravity ^(c)		Type	Shape	# ^(d)
		(km)	(R⊕)	(10^9 km^3)	(V⊕)	(10^21 kg)	(M⊕)	(g/cm^3)	(m/s^2)	(⊕)
Sun		696342±65[9]	109.3	1,414,300,000	1,305,700	1,988,550,000	333,000	1.408	274.0	27.94	star	round (HE)	1
Jupiter		69911±6	10.97	1,431,280	1,321	1,898,600	317.83	1.326	24.79	2.528	planet (gas giant); has rings	round (HE)	2
Saturn		58232±6 (w/o rings)	9.140	827,130	764	568,460	95.162	0.687	10.445	1.065	planet (gas giant); has rings	round (HE)	3
Uranus		25362±7	3.981	68,340	63.1	86,832	14.536	1.27	8.87	0.90	planet (ice giant); has rings	round (HE)	4
Neptune		24622±19	3.865	62,540	57.7	102,430	17.147	1.638	11.15	1.137	planet (ice giant); has rings	round (HE)	5
Earth		6371.0±0.01	1	1,083.21	1	5,973.6	1	5.514	9.80665	1	planet (terrestrial)	round (HE)	6
Venus		6051.8±1.0 (w/o gas)	0.9499	928.43	0.857	4,868.5	0.815	5.243	8.872	0.905	planet (terrestrial)	round (HE)	7
Mars		3389.5±0.2	0.5320	163.18	0.151	641.85	0.107	3.9335 ± 0.0004	3.7	0.38	planet (terrestrial)	round (HE)	8
Ganymede Jupiter III		2634.1±0.3	0.4135	76.30	0.0704	148.2	0.0248	1.936	1.428	0.15	moon of Jupiter	round (HE)	9
Titan Saturn VI		2576±2 (w/o gas)	0.4043	71.52	0.0660	134.5	0.0225	1.8798 ± 0.0044	1.354	0.14	moon of Saturn	round (HE)	10
Mercury		2439.7±1.0	0.3829	60.83	0.0562	330.2	0.0553	5.427	3.7	0.38	planet (terrestrial)	round (HE)	11
Callisto Jupiter IV		2410.3±1.5	0.3783	58.65	0.0541	107.6	0.018	1.8344 ± 0.0034	1.23603	0.126	moon of Jupiter	round (HE)	12
Io Jupiter I		1821.6±0.5	0.2859	25.32	0.0234	89.3	0.015	3.528 ± 0.006	1.797	0.183	moon of Jupiter	round (HE)	13
Moon Earth I		1737.1	0.2727	21.958	0.0203	73.5	0.0123	3.3464	1.625	0.166	moon of Earth	round (HE)	14
Europa Jupiter II		1560.8±0.5	0.2450	15.93	0.0147	48	0.008035	3.013 ± 0.005	1.316	0.134	moon of Jupiter	round (HE)	15
Triton Neptune I		1353.4±0.9	0.2124	10.38	0.0096	21.5	0.003599	2.061	0.782	0.0797	moon of Neptune	round (HE)	16
Pluto 134340		1186±2[10]	0.186	6.95	0.0064	13.105	0.0022	1.87 ± 0.02	0.61	0.062	dwarf planet; plutino; multiple	round (HE)	17
Eris 136199		1163±6[11]	0.1825	6.59	0.006	16.7[12]	0.0028	2.52 ± 0.05	0.659	0.0672	dwarf planet; SDO; binary	round (HE)	18
Titania Uranus III		788.4±0.6	0.1237	2.06	0.0019	3.526	0.00059	1.711 ± 0.005	0.378	0.0385	moon of Uranus	round	19
2007 OR10 225088		767+75 −225[13]	0.1200	1.88	0.0017						resonant KBO (3:10)	unknown	20
Rhea Saturn V		763.8±1.0	0.1199	1.87	0.0017	2.3166	0.00039	1.236 ± 0.005	0.26	0.027	moon of Saturn	round (HE) (disputed)	21
Oberon Uranus IV		761.4±2.6	0.1195	1.85	0.0017	3.014	0.0005	1.63 ± 0.05	0.347	0.035	moon of Uranus	round	22
Iapetus Saturn VIII		734.5±2.8	0.1153	1.55	0.0014	1.9739	0.00033	1.088 ± 0.013	0.223	0.0227	moon of Saturn	round (not in HE)	23
Makemake 136472		715±7	0.112	1.7	.0016			2.3 ± 0.9			dwarf planet; cubewano	round	24
Haumea 136108		620+34 −29	0.097	1.3–1.6	0.001	4.006	0.00067	2.55[14]	0.44	0.045	dwarf planet; resonant KBO (7:12); trinary	round (scalene ellipsoid)	25
Charon Pluto I		606±3	0.0951	0.87	0.0008	1.52	0.00025	1.702 ± 0.021	0.279	0.028	moon of Pluto	round	26
Umbriel Uranus II		584.7±2.8	0.0918	0.84	0.0008	1.2	0.00020	1.39 ± 0.16	0.234	0.024	moon of Uranus	round	27
Ariel Uranus I		578.9±0.6	0.0909	0.81	0.0007	1.35	0.000226	1.66 ± 0.15	0.269	0.027	moon of Uranus	round	28
Dione Saturn IV		561.4±0.4	0.0881	0.73	0.0007	1.096	0.000183	1.478 ± 0.003	0.232	0.0237	moon of Saturn	round (not in HE)	29
Quaoar 50000		555±3	0.0871			1.4 ± 0.1	0.0002	2.2 ± 0.4[15]	0.125	0.0127	cubewano; binary	unknown	30
Tethys Saturn III		531.1±0.6	0.0834	0.624	0.0006	0.6173	0.000103	0.984 ± 0.003[16]	0.145	0.015	moon of Saturn	round (not in HE)	31
Sedna 90377		500±80	0.0785								sednoid; detached object	unknown	32
Ceres 1		473[17]	0.0742	0.433	0.0004	0.939[18]	0.000157	2.17	0.29	0.030	dwarf planet; belt asteroid	round (HE)	33
2002 MS4 307261		467±24	0.0733								cubewano[19]	unknown	34
Orcus 90482		458±13	0.0719					2.47[20]			plutino; binary	unknown	35
Salacia 120347		425±23	0.0667			0.45 ± ?		1.16+0.59 −0.36[21]			cubewano; binary	unknown	36
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Jupiter I" for Io), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c) Given as surface gravity (1 bar for gaseous planets) ^(d) Ranking by radius of the largest bodies in the Solar System, may not reflect the latest updates of measured radii

From 200 to 400 km

All imaged icy moons except Proteus with radii greater than 200 km are round, though those under 400 km that have had their shapes carefully measured are not in hydrostatic equilibrium.^[22] Most asteroids are rockier and less likely to be round: 10 Hygiea is not, and 2 Pallas and 4 Vesta are borderline.

Body ^(a)	Image	Radius ^(b) (km)	Mass (10^20 kg)	Density (g/cm^3)	Type ^(c)	Remarks – Shape ^(d)	Refs ^(c) r · M
2013 FY27		265–550	–	–	SDO	large range of estimated diameters	r · M
2002 AW197 55565		384+20 −18	–	–	other TNO, detached object	–	[23] · [23]
2003 AZ84 208996		385	–	–	plutino; binary	–	r · M
Varda 174567		358	2.65	1.25	cubewano; binary	–	[23] · [23]
Dysnomia Eris I		342±25	–	–	moon of Eris	large range of estimated diameters 100–660 km	[24] · M
2004 GV9 90568		340±40	–	–	cubewano	–	r · M
2005 RN43 145452		340±40	–	–	cubewano	–	r · M
2002 UX25 55637		335±17	1.25	0.82	cubewano; binary	–	[23] · [25]
2007 JJ43 278361		335±150[26]	–	–	cubewano	–	r · M
Varuna 20000		334+77 −43	3.7	0.99[14]	cubewano	–	[27] · M
Ixion 28978		325+130 −110	–	–	plutino	–	r · M
2007 UK126 229762		300±40	–	–	SDO	–	r · M
Chaos 19521		300±70	–	–	cubewano	–	r · M
2010 KZ39		~300	–	–	cubewano[28]	–	r · M
2012 VP113		~300	–	–	sednoid	–	r · M
2010 RF43		~300	–	–	SDO	–	r · M
2005 RM43 145451		~300	–	–	SDO	–	r · M
2001 UR163 42301		~300	–	–	SDO	–	r · M
2002 TC302 84522		290±50	–	–	resonant KBO (2:5)	–	r · M
2002 XV93		280±10	–	–	plutino	–	r · M
2003 UZ413 455502		~280	–	–	plutino	–	r · M
2008 ST291		~318	–	–	SDO	–	r · M
2010 RE64		~280	–	–	SDO	–	r · M
2010 FX86		~280	–	–	cubewano	–	r · M
2006 QH181		~280	–	–	SDO	–	r · M
2014 UM33		~270	–	–	cubewano	–	r · M
2004 XR190		~270	–	–	SDO	–	r · M
Vesta 4		262.7±0.1	2.59	3.46	belt asteroid	formerly round (not in hydrostatic equilibrium: frozen-in ellipsoidal shape and large impact basins)[29][30]	[31] · [31]
2003 VS2 84922		260±20	–	–	plutino	–	r · M
2004 TY364 120348		~260	–	–	cubewano	–	r · M
2010 VK201		~260	–	–	cubewano	–	r · M
Pallas 2		256±3[32]	2.11±0.26[33]	3.0±0.5	belt asteroid	uncertain	[32] · M
2014 FT71		~253	–	–	–	–	r · M
Enceladus Saturn II		252.1±0.2	1.08	1.61	moon of Saturn	round (not in hydrostatic equilibrium: frozen-in ellipsoidal shape)	r · M
2005 UQ513 202421		250±40	–	–	cubewano	–	r · M
2003 QX113		~250	–	–	SDO	–	r · M
2014 FC69		~250	–	–	–	–	r · M
2002 WC19 119979		245	–	–	twotino; binary	–	r · M
2010 EK139		240±70	–	–	SDO	–	r · M
Miranda Uranus V		235.8±0.7	0.66	1.2	moon of Uranus	round	r · M
2005 TB190 145480		230±30	–	–	detached object	–	r · M
1999 DE9 26375		230±20	–	–	resonant KBO (2:5)	–	r · M
2003 FY128 120132		230±10	–	–	SDO	–	r · M
Huya 38628		229±5	–	–	plutino	–	r · M
2002 VR128 84719		220±20	–	–	plutino	–	r · M
2010 TJ		~220	–	–	SDO	–	r · M
2010 VZ98 445473		~220	–	–	SDO	–	r · M
2011 FW62		~220	–	–	other TNO	–	r · M
Hygiea 10		215±4	–	–	belt asteroid	irregular	r · M
Proteus Neptune VIII		210±7	0.44	~1.3	moon of Neptune	irregular	r · M
2005 QU182 303775		210±40	–	–	SDO	–	r · M
2004 NT33 444030		210±40	–	–	cubewano	–	r · M
1999 CD158		~210	–	–	resonant KBO (4:7)	–	r · M
2004 PF115 175113		203±43	–	–	plutino	–	r · M
2011 GM27		~201	–	–	cubewano	–	r · M
1998 SN165 35671		200±20	–	–	cubewano	–	r · M
2001 QF298		200±20	–	–	plutino	–	r · M
2000 YW134 82075		~200	–	–	SDO	–	r · M
1996 GQ21 26181		~200	–	–	SDO	–	r · M
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn II" for Enceladus), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c,d) Figures from default source Johnston's Archive—List of Known Trans-Neptunian Objects,[19] if otherwise not mentioned in References Legend:       belt asteroid        moon of Saturn        moon of Uranus        moon of Neptune        Dysnomia, moon of Eris SDO – scattered disc object, cubewano – classical Kuiper belt object

From 100 to 200 km

This list contains a selection of objects estimated to be between 100 and 200 km in radius (200 and 400 km in diameter). The largest of these may lie above the boundary for hydrostatic equilibrium, but most are irregular. Most of the trans-Neptunian objects listed with a radius smaller than 200 km have "assumed sizes based on a generic albedo of 0.09" since they are too far away to directly measure their sizes with existing instruments. Mass switches from 10²¹ kg to 10¹⁸ kg (Zg). Main-belt asteroids have orbital elements constrained by (2.0 AU < a < 3.2 AU; q > 1.666 AU) according to JPL Solar System Dynamics (JPLSSD).^[34] This list is not complete, missing many poorly known TNOs.^[19]

Body^(a)	Image	Radius^(b) (km)	Mass (10^18 kg)	Type	Remarks – Shape	Refs ^(c) r · M
Mimas Saturn I		198.2±0.4	37.49±0.03	satellite of Saturn	round (smallest known body currently known to have an ellipsoidal shape, but not in hydrostatic equilibrium)	r · M
Vanth Orcus I		190±50		satellite of Orcus	–	[20] · M
2010 TY53		~183		extended centaur	–	r · M
Ilmarë Varda I		180±20		satellite of Varda	–	r · M
1996 TL66 15874		170±10		SDO	–	r · M
Nereid Neptune II		170±30		satellite of Neptune	–	r · M
2004 XA192 230965		170±60		SDO	–	r · M
2001 FP185 82158		166±28		SDO	–	r · M
Interamnia 704		163±1	37	belt asteroid (F)	irregular shape	r · M
Hiʻiaka Haumea I		160	20	satellite of Haumea	–	[35] · M
2002 KX14 119951		159		cubewano	–	r · M
Europa 52		158±4	16.5	belt asteroid (C)	irregular shape[36]	r · M
1995 SN55		~150		Lost—centaur or transient TNO	–	r · M
Davida 511		145±10	43.8	belt asteroid (C)	irregular shape	r · M
Sylvia 87		143±5	14.78	belt asteroid (outer) (X); trinary	irregular shape[36]	r · M
Actaea Salacia I		140±10		satellite of 120347 Salacia	–	r · M
Cybele 65		136±6	17.8	belt asteroid (outer) (C)	irregular shape	r · M
Juno 3		136±11	26.7	belt asteroid (S)	irregular shape[36]	[37] · M
Hyperion Saturn VII		135±4	5.58	satellite of Saturn	irregular shape	r · M
Eunomia 15		134±7	31.2	belt asteroid (S)	irregular shape[36]	r · M
Camilla 107		129±7	11.2	belt asteroid (outer) (C); binary	irregular shape[38]	r · M
Euphrosyne 31		128±3	6.23	belt asteroid (C)	irregular shape	r · M
Psyche 16		127±2	21.9	belt asteroid (M)	irregular shape	r · M
2005 RR43 145453		126		cubewano; Haumea family	–	[39] · M
Sila 79360		125+15 −16	11	cubewano; binary w/ Nunam	double classical Kuiper belt object 79360 Sila–Nunam	[23] · M
Chariklo 10199		124±9		centaur	has rings	r · M
2007 RW10 309239		124±15		TNO—quasi-satellite of Neptune	–	r · M
Nunam 79360		118+14 −15		cubewano; binary w/ Sila	double classical Kuiper belt object 79360 Sila–Nunam	[23] · M
Bamberga 324		117±4	10	belt asteroid (C)		r · M
Patientia 451		117±5		belt asteroid	irregular shape	r · M
2001 QC298		117+11 −12	11.88±0.14	hot classical; binary	–	[23] · M
Chiron 2060 or 95P/Chiron		116±7		centaur	has rings	r · M
Thisbe 88		113±6	10.5	belt asteroid (B)	irregular shape[38]	r · M
Hektor 624		113±8	10	Jupiter trojan (L4); binary	irregular shape	r · M
Ceto 65489		112±10	5.4	extended centaur; binary	–	r · [40]
Herculina 532		111±2		belt asteroid (S)	irregular shape[36]	r · M
Doris 48		111±4		belt asteroid	irregular shape	r · M
Eugenia 45		107±2	5.69	belt asteroid (F); trinary	irregular shape[36]	r · M
Phoebe Saturn IX		106.5±0.7	8.29±0.01	satellite of Saturn	formerly round[41]	r · M
Amphitrite 29		106±3	11.8	belt asteroid (S)	irregular shape[36]	r · M
Bienor 54598		105±15		centaur	–	r · M
Deucalion 53311		~105		cubewano	–	r · M
Diotima 423		104±3		belt asteroid (C)	irregular shape[42]	r · M
Egeria 13		104±4	16.3	belt asteroid (G)	irregular shape	r · M
Fortuna 19		104±6	12.7	belt asteroid (G)	irregular shape	r · M
Aurora 94		102±2		belt asteroid	irregular shape[43]	r · M
Iris 7		100±5	13.6	belt asteroid (S)	irregular shape	r · M
Daphne 41		100±5		belt asteroid	irregular shape	r · M
Themis 24		100±10	11.3	belt asteroid (C); Themis family	–	r · M
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c) Reference column specifically for radius (r) and mass (M) citations Legend:       Jupiter trojan        moon of Saturn        moon of Neptune        moon of Haumea       belt asteroid—types: B · C · F · G · M · S · X

From 50 to 100 km

This list contains a selection of objects 50 and 100 km in radius (100 km to 200 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following reference.^[19] Asteroid spectral types are mostly Tholen, but some might be SMASS.

Body^(a)	Image	Radius^(b) (km)	Mass (10^18 kg)	Type – Remarks
Alauda 702		97±2	6.05	belt asteroid (C); binary
Larissa Neptune VII		97±3		moon of Neptune
Ursula 375		96±2		belt asteroid
2001 QC298 I		96+9 −10[44]		satellite of 2001 QC298
Hermione 121		95[45]	5.38	outer belt asteroid (C); binary
Palma 372		96±2		belt asteroid
Metis 9		95	11.3	belt asteroid
Nemesis 128		92±3	7	belt asteroid (C)
Hebe 6		93	12.8	belt asteroid (S)
Pholus 5145		92±8	6.6	centaur
Bertha 154		93±1		belt asteroid (C)
Freia 76		92±2	6.5	outer belt asteroid; Cybele
Elektra 130		91±6	6.6	belt asteroid (G); binary
Rhadamanthus 38083		100.5		[19] 1999 HX11; plutino?
Janus Saturn X		89.5±1.4	1.912	moon of Saturn
Aletheia 259		95±3	5.97	belt asteroid
Galatea Neptune VI		88±4	2.12	moon of Neptune
Teharonhiawako 88611		89+16 −18		[23] trans-Neptunian object; cubewano; primary of Sawiskera
Typhon 42355		81±4		trans-Neptunian object; binary
Lachesis 120		87	5.5	belt asteroid
Winchester 747		85±3		belt asteroid
Hilda 153		85	5.2	belt asteroid; Hildas
Namaka Haumea II		~85	2	moon of Haumea
Puck Uranus XV		81±2[46]		moon of Uranus
Aegle 96		84±3	5.1	belt asteroid
Germania 241		89±4	5.05	belt asteroid (C)
Prokne 194		85±3	5	belt asteroid (C)
Stereoskopia 566		84[47]		outer belt asteroid; Cybele
Amalthea Jupiter V		84±2	2.08±0.15	moon of Jupiter
Agamemnon 911		83		Jupiter trojan
Kalliope 22		90±2	8.09	belt asteroid (M); binary
Borasisi 66652		81.5+16 −33		[23] trans-Neptunian object; cubewano; binary
Siegena 386		85±4		belt asteroid (C)
Elpis 59		82±3		belt asteroid
Diomedes 1437		82±2	4.6	Jupiter trojan
Gyptis 444		82±5	12.5	belt asteroid (C)
Aspasia 409		88±2	4.42	belt asteroid (C)
Dioretsa 20461		14±3		[48] centaur;[49] damocloid
Dido 209		70±5	4.28	belt asteroid (C)
Chicago 334		84±4		belt asteroid (C)
Hispania 804		74±2	9.95	belt asteroid (P)
Eunike 185		80±3	4.09	belt asteroid
Juewa 139		81±4	4	belt asteroid
Io 85		80	3.4	belt asteroid
Loreley 165		82±4	3.91	belt asteroid (C)
Pretoria 790		80.49[50]		outer belt asteroid; Cybele
Ino 173		80±3		belt asteroid (C)
Altjira 148780		123+19 −70		[23] trans-Neptunian object; cubewano; binary; secondary S/2007 (148780) 1
Eleonora 354		77±3		belt asteroid (S)
Laetitia 39		76.9[50]	3.5	belt asteroid
Irene 14		76	8.2	belt asteroid
Julia 89		74±4	3.6	belt asteroid (S)
Merapi 536		76±2		belt asteroid
Berbericia 776		76±2		belt asteroid
Adeona 145		75±3	3.6	belt asteroid; Adena
Nuwa 150		73±5	3.62	belt asteroid (C)
Despina Neptune V		75±3		moon of Neptune
Sycorax Uranus XVII		~75	2.3	moon of Uranus
Manwë 385446		~75		resonant KBO (4:7)
Pales 49		74.9[51]	2.69	belt asteroid (C)
S/2007 (148780) 1 Altjira I		111+17 −63	trans-Neptunian object; cubewano; binary	[23] Secondary of 148780 Altjira
Lomia 117		~70	3.4	belt asteroid (C)
Hypatia 238		~70		belt asteroid (C)
Sibylla 168		~70	3.42	belt asteroid (C)
Emma 283		~70	1.38	belt asteroid; binary
Nemausa 51		~70		belt asteroid
Dione 106		~70		belt asteroid (G)
Meliboea 137		~70	3.2	belt asteroid
Massalia 20		~70	5.67	belt asteroid
Isolda 211		~70	3.07	belt asteroid (C)
Äneas 1172		~70		Jupiter trojan
Vibilia 144		~70	3	belt asteroid
Princetonia 508		~70		belt asteroid
Helio 895		~70		belt asteroid (B)
Bononia 361		~70		belt asteroid (D)
Bertholda 420		~70		belt asteroid (P)
Minerva 93		~70	2.9	belt asteroid (C); trinary
Patroclus 617		~70		Jupiter trojan; binary
Polyxo 308		~70		belt asteroid (T)
Melpomene 18		~70	3	belt asteroid
Adorea 268		~70		belt asteroid
Dembowska 349		~70		belt asteroid (R)
Comacina 489		~70		belt asteroid
Hesperia 69		~70	2.76	belt asteroid (M)
Alexandra 54		~70		belt asteroid
Pulcova 762		~70		belt asteroid (C); binary
Pabu Borasisi I		~70		Secondary of 66652 Borasisi
Philomela 196		~70		belt asteroid (S)
Medea 212		~70	2.64	belt asteroid
Arethusa 95		~70	2.6	belt asteroid
Portia Uranus XII		68±4	1.7	moon of Uranus
Achilles 588		~70		Jupiter trojan
Wratislavia 690		~70		belt asteroid
Ate 111		~70		belt asteroid (C)
Eukrate 247		~70		belt asteroid (C)
Erminia 705		~70		belt asteroid
Papagena 471		~70		belt asteroid (C)
Phorcys <Ceto I		86±5	1.67[40]	Satellite of 65489 Ceto
Protogeneia 147		~70	2.5	belt asteroid
Menoetius Patroclus I		~70		Secondary of 617 Patroclus
Desiderata 344		~70		belt asteroid (C)
Lucina 146		~70	2.4	belt asteroid
Lumen 141		~70	1.6	belt asteroid (C)
Liguria 356		~70		belt asteroid
Parthenope 11		~70	6.15	belt asteroid
Lamberta 187		~70	2.37	belt asteroid (C)
Himalia Jupiter VI		67±10[52]	4.19[53]	moon of Jupiter—Himalia group
Aurelia 419		~60		belt asteroid (F)
Dynamene 200		~60		belt asteroid
Flora 8		~60	8.47	belt asteroid (S); Flora
Boliviana 712		~60		belt asteroid (X)
Zelinda 654		~60		belt asteroid
Hippo 426		~60		belt asteroid
Aglaja 47		~60		belt asteroid (C)
Thule 279		~60		belt asteroid (D)
Undina 92		~60	2.1	belt asteroid (M)
Anchises 1173		~60		Jupiter trojan
Odysseus 1143		~60		Jupiter trojan (L4)
Argentina 469		~60		belt asteroid; Cybele
Aemilia 159		~60	1.4	belt asteroid
Thia 405		~60		belt asteroid (C)
Marianna 602		~60		belt asteroid
Hestia 46		~60	3.5[54]–21[55]	belt asteroid
Kleopatra 216		~60		belt asteroid (M); trinary
Klymene 104		~60	2	belt asteroid
Chloris 410		~60		belt asteroid (C)
Sophrosyne 134		~60	2	belt asteroid
Gudrun 328		~60	1.94	belt asteroid (S)
Deiphobus 1867		~60		Jupiter trojan
Leto 68		~60		belt asteroid (S)
Panopaea 70		~60		belt asteroid (C)
Sawiskera Teharonhiawako I		65+12 −13		[23] Secondary of 88611 Teharonhiawako
Johanna 127		~60		belt asteroid
Adelheid 276		~60		belt asteroid
Iduna 176		~60		belt asteroid (G)
Xanthippe 156		~60		belt asteroid (S)
Bellona 28		~60		belt asteroid (C)
Semele 86		~60		belt asteroid (C)
Diana 78		~60		belt asteroid (C)
Myrrha 381		~60		belt asteroid (C)
Henrietta 225		~60	1.83	belt asteroid (C); Cybele
Elfriede 618		~60		belt asteroid (C)
Artemis 105		~60	1.8	belt asteroid (C)
Terpsichore 81		~60		belt asteroid (C)
Astraea 5		~60	2.9	belt asteroid
Galatea 74		~60	1.8	belt asteroid (C)
Ornamenta 350		~60		belt asteroid (C)
Tanete 772		~60		belt asteroid (C)
Hedwig 476		~60		belt asteroid
Freda 1093		~60		belt asteroid
Ophelia 171		~60		belt asteroid (C); Themis
Ulla 909		~60		belt asteroid
Paris 3317		~60		Jupiter trojan
Pompeja 203		~60		belt asteroid
Makhaon 3063		~60	1.6	Jupiter trojan
2006 SQ372 308933		~60		trans-Neptunian object
Leda 38		~60	1.6	belt asteroid
Carlova 360		~60		belt asteroid
Brixia 521		~60		belt asteroid
Veritas 490		~60		belt asteroid; Veritas family
Tisiphone 466		~60		belt asteroid (C)
Kalypso 53		~60		belt asteroid
Alcathous 2241		~60		Jupiter trojan
Charybdis 388		~60		belt asteroid (C)
Circe 34		~60	1.5	belt asteroid (C)
Epimetheus Saturn XI		58±2	0.5304[56]	moon of Saturn
Scheila 596		~60		belt asteroid
Melete 56		~60	1.5	belt asteroid
Antigone 129		~60	2	belt asteroid; nickel–iron
Victoria 12		~60		belt asteroid (S)
Mnemosyne 57		~60		belt asteroid
Messalina 545		~60		belt asteroid
Teucer 2797		~60		Jupiter trojan (L4)
Automedon 2920		~60		Jupiter trojan (L4)
Aegina 91		~50	1.4	belt asteroid (C)
Siwa 140		~50	1.4	belt asteroid
Tauris 814		~50		belt asteroid
Polyxena 595		~50		belt asteroid
Athamantis 230		~50		belt asteroid (S)
Nestor 659		~50		Jupiter trojan
Fides 37		~50	1.3	belt asteroid (S)
Armida 514		~50		belt asteroid
Thalia 23		~50	1.3	belt asteroid (S)
Mandeville 739		~50		belt asteroid (X)
Harmonia 40		~50	1.3	belt asteroid (S)
Eucharis 181		~50	1.2	belt asteroid (K)
Hermentaria 346		~50		belt asteroid (S)
Ninina 357		~50		belt asteroid
Marion 506		~50		belt asteroid (C)
Corduba 365		~50		belt asteroid (C)
Atalante 36		~50		belt asteroid
Luscinia 713		~50		belt asteroid (C)
Rollandia 1269		~50		belt asteroid
Eva 164		~50		belt asteroid (C)
Ianthe 98		~50	1.2	belt asteroid (C)
Vanadis 240		~50		belt asteroid (C)
Eos 221		~50		belt asteroid (K)
Hohensteina 788		~50		belt asteroid
Ani 791		~50		belt asteroid
Troilus 1208		~50		Jupiter trojan
Nausikaa 192		~50		belt asteroid (S)
Ausonia 63		~50	1.1	belt asteroid (S)
Leukothea 35		~50	1.1	belt asteroid (C)
Kythera 570		~50		belt asteroid
Asterope 233		~50		belt asteroid (T)
Euforbo 4063		~50		Jupiter trojan
Antilochus 1583		~50		Jupiter trojan
Abastumani 1390		~50		belt asteroid
Helga 522		~50		belt asteroid; Cybele
Andromache 175		~50		belt asteroid (C)
Kolga 191		~50	1.08	belt asteroid (C)
Gerlinde 663		~50		belt asteroid
Notburga 626		~50		belt asteroid
Aquitania 387		~50		belt asteroid (S)
Isis 42		~50		belt asteroid (S)
Urania 30		~50		belt asteroid (S)
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets ^(b) Mean radius including uncertainties Legend:       Jupiter trojan        moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune        moon of Haumea       belt asteroid—types: C · D · F · G · K · M · P · R · S · T · X

From 20 to 50 km

This list contains a few examples because there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 50 km.^[57] Many thousands of objects of this size range have yet to be discovered in the Trans-Neptunian region. The number of digits is not an endorsement of significant figures. The table switches from ×10¹⁸ kg to ×10¹⁵ kg (Eg), and many of these mass values are assumed. (See list of minor planets.)

Body^(a)	Image	Radius^(b) (km)	Mass (10^15 kg)	Type – Notes	Refs ^(c) r · M
21 Lutetia		~50	1700	belt asteroid (M)	r · [58]
50 Virginia		~50		asteroid	r · M
114 Kassandra		~50	1000	belt asteroid (T)	r · M
1021 Flammario		~50		asteroid	r · M
162 Laurentia		~50		belt asteroid	r · M
401 Ottilia		~50		belt asteroid	r · M
Thebe Jupiter XIV		~50		moon of Jupiter	r · M
148 Gallia		~50	980	belt asteroid (R)	r · M
404 Arsinoe		~50		belt asteroid (C)	r · M
27 Euterpe		~50		belt asteroid (S)	r · M
773 Irmintraud		~50		asteroid (D)	r · M
62 Erato		~50	910	belt asteroid; Themis	r · M
26 Proserpina		~45	900	asteroid	r · M
345 Tercidina		~45		belt asteroid (C)	r · M
Juliet Uranus XI		~45		moon of Uranus	r · M
58 Concordia		~45	850	asteroid	r · M
229 Adelinda		~45		belt asteroid (C)	r · M
379 Huenna		~45	480	belt asteroid (C)	r · M
103 Hera		~45	790	asteroid	r · M
17 Thetis		~45	1200	asteroid	r · M
143 Adria		~45	760	belt asteroid	r · M
109 Felicitas		~45	750	asteroid	r · M
100 Hekate		~45	1000	asteroid	r · M
90 Antiope A		~45	410	asteroid (C); binary	r · M
227 Philosophia		~45		belt asteroid	r · M
Prometheus Saturn XVI		~45	156.6	moon of Saturn	r · M
110 Lydia		~45	670	asteroid	r · M
Elara Jupiter VII		~45		moon of Jupiter; Himalia group	r · M
72 Feronia		~45	670	asteroid	r · M
Echidna Typhon I		44±3		satellite of 42355 Typhon	r · M
Thorondor Manwë I		~40		satellite of Manwë	r · M
60558 Echeclus 174P/Echeclus		~40		centaur[59]	r · M
S/2000 (90) 1		~40		asteroid moon of 90 Antiope	r · M
71 Niobe		~40	610	asteroid	r · M
102 Miriam		~40		asteroid	r · M
97 Klotho		~40	590	asteroid	r · M
61 Danae		~40		asteroid	r · M
Thalassa Neptune IV		~40		moon of Neptune	r · M
122 Gerda		~40	570	belt asteroid (S)	r · M
Pandora Saturn XVII		~40	135.6	moon of Saturn	r · M
83 Beatrix		~40	560	belt asteroid (X)	r · M
32 Pomona		~40		asteroid	r · M
Belinda Uranus XIV		~40		moon of Uranus	r · M
115 Thyra		~40		asteroid	r · M
Cressida Uranus IX		~40		moon of Uranus	r · M
135 Hertha		~40		asteroid	r · M
84 Klio		~40	520	asteroid	r · M
80 Sappho		~40		asteroid	r · M
1001 Gaussia		~40		asteroid	r · M
58534 Logos		~40	270	Kuiper belt object; cubewano; binary	r · M
124 Alkeste		~40	470	belt asteroid (S)	r · M
55576 Amycus		~40		centaur	r · M
25 Phocaea		~40		asteroid	r · M
Weywot Quaoar I		~35		satellite of Quaoar	r · M
8405 Asbolus		~35		centaur	r · M
112 Iphigenia		~35		asteroid	r · M
Rosalind Uranus XIII		~35	250	moon of Uranus	r · M
Caliban Uranus XVI		~35		moon of Uranus	r · M
99 Dike		~35	390	asteroid	r · M
66 Maja		~35		asteroid	r · M
116 Sirona		~35		belt asteroid	r · M
44 Nysa		~35	370	belt asteroid (E)	r · M
10370 Hylonome		~35		centaur	r · M
77 Frigga		~35	350	asteroid	r · M
55 Pandora		~35		asteroid	r · M
133 Cyrene		~35	310	belt asteroid (S)	r · M
79 Eurynome		~35		asteroid	r · M
Zoe Logos I		~35		satellite of 58534 Logos	r · M
Naiad Neptune III		~35		moon of Neptune	r · M
43 Ariadne		~35		asteroid	r · M
101 Helena		~35	300	asteroid	r · M
108 Hecuba		~30	390	asteroid	r · M
Desdemona Uranus X		~30		moon of Uranus	r · M
Halimede Neptune IX		~30		moon of Neptune	r · M
52975 Cyllarus		~30		centaur	r · M
82 Alkmene		~30		asteroid	r · M
60 Echo		~30		asteroid	r · M
Crantor 83982		~30		centaur	r · M
Comet Hale–Bopp C/1995 O1		~30		comet	r · M
Pasiphae Jupiter VIII		~30		moon of Jupiter	r · M
7066 Nessus		~30		centaur	r · M
Neso Neptune XIII		~30		moon of Neptune	r · M
64 Angelina		~30		belt asteroid (E)	r · M
67 Asia		~30		asteroid	r · M
119 Althaea		~30	200	belt asteroid (S)	r · M
75 Eurydike		~30	180	belt asteroid (M)	r · M
142 Polana		~30	180	belt asteroid (F)	r · M
253 Mathilde		26.4	103.3	belt asteroid (C)	r · M
52872 Okyrhoe		~25		centaur	r · M
Bianca Uranus VIII		~25	92	moon of Uranus	r · M
Prospero Uranus XVIII		~25	85	moon of Uranus	r · M
Setebos Uranus XIX		~25	75	moon of Uranus	r · M
123 Brunhild		~25		belt asteroid	r · M
4348 Poulydamas		~25		asteroid; Jupiter Trojan	r · M
1000 Piazzia		~25		belt asteroid	r · M
113 Amalthea		~25	100	belt asteroid	r · M
Carme Jupiter XI		~25	130	moon of Jupiter; Carme group	r · M
138 Tolosa		~25	99	belt asteroid (S)	r · M
126 Velleda		~20	94	belt asteroid	r · M
73 Klytia		~20	92	asteroid	r · M
Sao Neptune XI		~20		moon of Neptune	r · M
125 Liberatrix		~20	87	belt asteroid (M)	r · M
Metis Jupiter XVI		~20	36	moon of Jupiter	r · M
132 Aethra		~20	82	belt asteroid (M)	r · M
Ophelia Uranus VII		~20	53	moon of Uranus	r · M
Laomedeia Neptune XII		~20		moon of Neptune	r · M
118 Peitho		~20	76	belt asteroid	r · M
208 Lacrimosa		~20	73.9	belt asteroid (S) Koronis	r · M
136 Austria		~20	68	belt asteroid (M)	r · M
131 Vala		~20	69	belt asteroid	r · M
Cordelia Uranus VI		~20	44	moon of Uranus	r · M
Siarnaq Saturn XXIX		~20		moon of Saturn	r · M
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c) Reference column specifically for radius (r) and mass (M) citations Legend:       moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune       belt asteroid—types: C · D · E · F · M · R · S · T · X

From 1 to 20 km

This list contains only a few examples of objects between 1 and 20 km in radius.

Body^(a)	Image	Radius^(b) (km)	Mass (10^15 kg)	Type – Notes	Refs ^(c) r · M
167 Urda		~20	66.7	belt asteroid; Koronis family; S-type	r · M
Sinope Jupiter IX		~20	76	moon of Jupiter	r · M
Psamathe Neptune X		~20	37	moon of Neptune	r · M
29P/Schwassmann– Wachmann		~20		comet; centaur	r · M
Lysithea Jupiter X		~20	63	moon of Jupiter; Himalia group	r · M
158 Koronis		~20		belt asteroid; Koronis family; S-type	r · M
Hidalgo 944		19		centaur, first to be discovered in 1920; historically called asteroid.	[60] · M
Hydra Pluto III		19		moon of Pluto	[61] · M
Helene Saturn XII, Dione B		17.6±0.4	25	moon of Saturn; Dione trojan	[62] · M
Nix Pluto II		17.5		moon of Pluto	[63] · M
243 Ida		15.7	42	belt asteroid; Koronis family; S-type; binary	[64] · M
1655 Comas Solà		15.3±1.1		belt asteroid; B-type	[65] · M
Atlas Saturn XV		15.1±0.9	66	moon of Saturn	[62] · M
226 Weringia		~15		belt asteroid; S-type	r · M
433 Eros		~15	66.9	Amor/ NEA	r · M
Stephano Uranus XX		~15	22	moon of Uranus	r · M
Albiorix Saturn XXVI		~15		moon of Saturn	r · M
1036 Ganymed		~15	33	NEA	r · M
1815 Beethoven		~15		belt asteroid	r · M
31824 Elatus		~15		centaur	r · M
Perdita Uranus XXV		~15	13	moon of Uranus	r · M
Linus Kalliope I		~15	60	asteroid moon of 22 Kalliope	r · [66]
Ananke Jupiter XII		~15	38.2	moon of Jupiter	r · M
Pan Saturn XVIII		14.1±1.3	4.95	moon of Saturn	[22] · [67]
Phobos Mars I		11.267	10.7	moon of Mars	r · M
Telesto Saturn XIII or Tethys B		~10		moon of Saturn Tethys trojan	r · M
Paaliaq Saturn XX		~10	8.2	moon of Saturn	r · M
Francisco Uranus XXII		~10	7.2	moon of Uranus	r · M
Calypso Saturn XIV or Tethys C		~10		moons of Saturn; Tethys trojan	r · M
Leda Jupiter XIII		~10	11	moon of Jupiter; Himalia group	r · M
Ferdinand Uranus XXIV		~10	5.4	moon of Uranus	r · M
Margaret Uranus XXIII		~10	5.4	moon of Uranus	r · M
149 Medusa		~10	8	belt asteroid	r · M
Romulus Sylvia I		~10	4	asteroid moon of 87 Sylvia	r · M
Ymir Saturn XIX		~10		moon of Saturn	r · M
Trinculo Uranus XXI		~10	3.9	moon of Uranus	r · M
Cupid Uranus XXVII		~10	3.8	moon of Uranus	r · M
S/2004 N 1		~10		moon of Neptune	r · M
2002 Euler		~10	5.5	belt asteroid	r · M
Adrastea Jupiter XV		~10	2	moon of Jupiter	r · M
Kiviuq Saturn XXIV		~10		moon of Saturn	r · M
2000 Herschel		~10		belt asteroid[68]	r · M
Tarvos Saturn XXI		~10		moon of Saturn	r · M
S/2006 (624) 1 Hektor I		~10		asteroid moon of 624 Hektor	r · M
Kerberos Pluto IV		~10		moon of Pluto	r · M
2685 Masursky		~10	5–11	belt asteroid	r · M
Styx Pluto V		~10		moon of Pluto	r · M
951 Gaspra		6.1±0.4	2–3	belt asteroid	[69] · M
(65407) 2002 RP120		~5	3.1	Damocloid (retrograde) & possible ejected SDO	r · M
Bestla Saturn XXXIX		~5		moon of Saturn	r · M
Petit-Prince Eugenia I		~5	1.2	asteroid moon of 45 Eugenia	r · M
Deimos Mars II		~5	1.48	moon of Mars	r · M
Ijiraq Saturn XXII		~5		moon of Saturn	r · M
S/2002 (121) 1 Hermione I		~5	1.6	asteroid moon of 121 Hermione	r · M
Halley's Comet		~5	0.03	comet	r · [70]
S/2001 (107) 1 Camilla I		~5	1.5	asteroid moon of 107 Camilla	r · M
Mab Uranus XXVI		~5		moon of Uranus	r · M
Erriapus Saturn XXVIII		~5		moon of Saturn	r · M
26858 Misterrogers		~5		belt asteroid	r · M
Callirrhoe Jupiter XVII		~5		moon of Jupiter	r · M
Themisto Jupiter XVIII		~5	0.69	moon of Jupiter	r · M
Remus Sylvia II		~5	0.2	asteroid moon of 87 Sylvia	r · M
S/2003 (379) 1 Huenna I		~5		asteroid moon of 379 Huenna	r · M
S/2003 (130) 1 Elektra I		~5	0.4	asteroid moon of 130 Elektra	r · M
S/2004 (45) 1 Eugenia II		~5		asteroid moon of 45 Eugenia	r · M
118401 LINEAR		~5	0.23	main-belt comet	r · M
4179 Toutatis		~5	0.05	NEA	r · M
3200 Phaethon		~5	0.14	Apollo asteroid; B-type	r · M
2P/Encke		<5		comet	r · M
C/1996 B2 Comet Hyakutake		<5		comet[71]	r · M
81P/Wild Wild 2		<5		comet	r · M
Pallene Saturn XXXIII		<5	0.043	moon of Saturn	r · M
Polydeuces Saturn XXXIV or Dione C		<5	0.03	moon of Saturn; Dione trojan	r · M
17P/Holmes		<5		comet	r · M
5535 Annefrank		<5		belt asteroid	r · M
3753 Cruithne		<5	0.13	Aten asteroid & quasi-satellite of Earth	r · M
(285263) 1998 QE2		<5		NEA; binary	r · M
4055 Magellan		<5		Amor asteroid; V-type	r · M
9969 Braille		<5		Mars-crosser asteroid	r · M
132524 APL		<5		belt asteroid	r · M
(6178) 1986 DA		<5	0.002	amor asteroid; M-type	r · M
Comet Comas Solà		4.2		Jupiter-family comet[72]	[73] · M
Daphnis Saturn XXXV		3.9±0.8	0.084	moon of Saturn	r · [67]
9P/Tempel		2.8	0.075	comet	[74] · M
2867 Šteins		2.65		belt asteroid; E-type	[75] · M
19P/Borrelly		2.4		Jupiter-family comet[72]	[76] · M
Comet Churyumov–Gerasimenko		1.9		Jupiter-family comet[72]	r · M
(53319) 1999 JM8		1.75		Apollo asteroid; PHA	[77] · M
Methone Saturn XXXII		1.6±0.6	0.019	moon of Saturn	r · M
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c) Reference column specifically for radius (r) and mass (M) citations Legend:       moon of Mars        moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune        moon of Pluto Types: Main belt asteroids; Comets; NEA: Near-Earth asteroid; Asteroid moon

Below 1 km

This list contains only a few examples of objects below 1 km in radius.

In the asteroid belt alone there are estimated to be between 1.1 and 1.9 million objects with a radius above 0.5 km,^[78] many of which are in the range 0.5–1.0 km. Countless more have a radius below 0.5 km.

Very few objects in this size range have been explored or even imaged. The exceptions are objects that have been visited by a probe, or have passed close enough to Earth to be imaged. Radius is by mean geometric radius. Number of digits not an endorsement of significant figures. Mass scale shifts from × 10¹⁵ to 10¹² kg, which is 10¹⁵ grams (Petagram – Pg).

Currently most of the objects of mass between 10⁹ kg to 10¹² kg (less than 1000 teragrams (Tg)) listed here are near-Earth asteroids (NEAs). (See also List of NEAs by distance from Sun.) 1994 WR₁₂ has less mass than the Great Pyramid of Giza, 5.9 × 10⁹ kg.

For more about very small objects in the Solar System, see meteoroid, micrometeoroid, and interplanetary dust cloud. (See also Visited/imaged bodies.)

Body^(a)	Image	Radius^(b) (m)	Mass (10^12 kg)	Type – Notes	Refs ^(c) r · M
1620 Geographos		885	4	NEA; Apollo	[79] · M
1862 Apollo		850	5.1	NEA; Apollo; Q-type	r · M
(214869) 2007 PA8		~800		NEA; Apollo	[80] · M
100000 Astronautica		~800		Inner belt asteroid[81]	[82] · M
Dactyl ^Ida I		700		Moon of 243 Ida	r · M
1566 Icarus		700	2.9	NEA; Apollo; U-type	r · M
4769 Castalia		700	1.3	NEA; Apollo	[83] · M
(137108) 1999 AN10		650		NEA; Apollo	r · M
(29075) 1950 DA		600	3	NEA; Apollo	r · M
(66391) 1999 KW4		600	2.33	Mercury-crosser asteroid; Aten	r · M
46P/Wirtanen		600		Comet	r · M
103P/Hartley Hartley 2		570±80	0.3	Comet	r · [84]
3908 Nyx		520	5	NEA; Amor; V-type	r · M
14827 Hypnos		450		Comet; dormant comet[85]	[86] · M
2062 Aten		450	0.76	NEA; Aten	[87] · M
2007 CA19		432	1.2	NEA; Apollo	r · M
6489 Golevka		350		NEA; Apollo	[88] · M
25143 Itokawa		346	0.0358	NEA; Apollo	r · M
2004 XP14		300		NEA; Apollo	r · M
(144898) 2004 VD17		290	3	NEA; Apollo	r · [89]
Aegaeon Saturn LIII		250		moon of Saturn	r · M
2005 YU55 308635		180		NEA;[90] Apollo; PHO[91]	[92] · M
4660 Nereus		165		NEA; Apollo	[93] · M
(357439) 2004 BL86		162.5		NEA; Apollo—binary	r · M
99942 Apophis		162.5	0.05	NEA; Aten; PHO	[94] · [89]
S/2009 S 1		150		moon of Saturn	r · M
2010 TK7		150		Earth trojan; Apollo	r · M
2007 TU24		125		NEA; Apollo; PHO	[95] · M
2002 JE9		100		NEA; Apollo; PHO	r · M
2010 XC15		100		NEA; Apollo; PHO	r · M
1994 WR12		65	0.002	NEA; Aten	[96] · [89]
2009 FD 410777		65	0.0028	NEA; Apollo	[97] · [97]
2008 HJ		18	0.000005	NEA & fast rotator (42 s)[98]	[98] · [98]
367943 Duende 2012 DA14		15		NEA	r · M
1998 KY26		15		NEA & fast rotator (10 min)	[99] · M
Notes: ^(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn LIII" for Aegaeon), and numbers to designate minor planets ^(b) Mean radius including uncertainties ^(c) Reference column specifically for radius (r) and mass (M) citations Legend:       minor-planet moon        moon of Saturn NEA: near-Earth asteroid; Apollo asteroids are a group of NEAs

Surface gravity

The surface gravity at the equator of a body can in most cases be accurately calculated using Newton's law of universal gravitation and centrifugal force.

The gravitational acceleration at the equator is given by Newton's law of universal gravitation. The formula that follows from this law is:

$a_g = G \frac{m}{r^2}$

where

a_g is the magnitude of the gravitational acceleration

G is the gravitational constant

m is the mass of the celestial body

r is the equatorial radius of the celestial body (if this varies significantly, the mean equatorial radius is used)

The magnitude of the outward acceleration due to centrifugal force is given by

$a_c = 4\pi^2\frac{r}{T^2}$

where

T is the rotation period of the celestial body

The surface gravity at the equator is then given by

$g = a_g - a_c = \frac{G m}{r^2} - \frac{4\pi^2r}{T^2}$

Notes

^† Using equatorial radius and assuming body is spherical

^‡ Using three radii and assuming body is spheroid

* Radius is known only very approximately

^R Radius has been determined by various methods, such as optical (Hubble), thermal (Spitzer), or direct imaging via spacecraft

⁹ Unknown radius, generic assumed albedo of 0.09

^$ Well studied asteroid or moon whose dimensions and mass are very well known. Asteroid sizes and masses taken from James Baer's (Bio) personal website.

^M Mass has been determined by perturbation. For asteroids, see James Baer's personal website.

Note: For many of the well-determined moons, radii were taken from the JPL Solar System Dynamics page.

^O Radius has been determined by an occultation

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Further reading

• NASA Planetary Data System (PDS)
• Asteroids with Satellites
• Minor Planet discovery circumstances
• Supplemental IRAS Minor Planet Survey (SIMPS) and IRAS Minor Planet Survey (IMPS)
  • SIMPS & IMPS (V6, additional, from here)
  • Asteroid Data Archive (dead link) Archive Planetary Science Institute

External links

• Planetary fact sheets
• Asteroid fact sheet
• All (known) Bodies in the Solar System Larger than 200 Miles in Diameter – in an image, put side-by-side.
• Size comparison of asteroids and comets visited by space probe (Parent article of image at The Planetary Society)
• Scaled Solar System montage at TPS Blog