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.

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⊕) (109 km3) (V⊕) (1021 kg) (M⊕) (g/cm3) (m/s2) (⊕)
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 satellite 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
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) 20
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 21
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) 22
Makemake
136472		 715±7 0.112 1.7 .0016 2.3 ± 0.9 dwarf planet; cubewano round 23
2007 OR10
225088		 640±105[13] 0.1005 1.0981 0.00101 resonant KBO (3:10) unknown 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 .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
(1020 kg)		 Density
(g/cm3)		 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 ~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 ~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 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
(1018 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 outer belt asteroid (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
(1018 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[39] 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[39] 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[50] 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[51] 4.19[52] 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[53]–21[54] 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[55] 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.[56] 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
(1015 kg)		 Type – Notes Refs (c)
r · M
21 Lutetia
~50 1700 belt asteroid (M) r · [57]
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[58] 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
(1015 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. [59] · M
Hydra
Pluto III
19 moon of Pluto [60] · M
Helene
Saturn XII, Dione B
17.6±0.4 25 moon of Saturn; Dione trojan [61] · M
Nix
Pluto II
17.5 moon of Pluto [62] · M
243 Ida
15.7 42 belt asteroid; Koronis family; S-type; binary [63] · M
1655 Comas Solà 15.3±1.1 belt asteroid; B-type [64] · M
Atlas
Saturn XV
15.1±0.9 66 moon of Saturn [61] · 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 · [65]
Ananke
Jupiter XII		 ~15 38.2 moon of Jupiter r · M
Pan
Saturn XVIII
14.1±1.3 4.95 moon of Saturn [22] · [66]
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[67] 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 [68] · 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 · [69]
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[70] 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 [71] · M
Daphnis
Saturn XXXV
3.9±0.8 0.084 moon of Saturn r · [66]
9P/Tempel
2.8 0.075 comet [72] · M
2867 Šteins
2.65 belt asteroid; E-type [73] · M
19P/Borrelly
2.4 Jupiter-family comet [74] · M
Comet Churyumov–Gerasimenko
1.9 comet r · M
(53319) 1999 JM8
1.75 Apollo asteroid; PHA [75] · 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,[76] 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
(1012 kg)		 Type – Notes Refs (c)
r · M
1620 Geographos
885 4 NEA; Apollo [77] · M
1862 Apollo 850 5.1 NEA; Apollo; Q-type r · M
(214869) 2007 PA8 ~800 NEA; Apollo [78] · M
100000 Astronautica ~800 Inner belt asteroid[79] [80] · 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 [81] · 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 · [82]
3908 Nyx 520 5 NEA; Amor; V-type r · M
14827 Hypnos 450 Comet; dormant comet[83] [84] · M
2062 Aten 450 0.76 NEA; Aten [85] · M
2007 CA19 432 1.2 NEA; Apollo r · M
6489 Golevka 350 NEA; Apollo [86] · 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 · [87]
Aegaeon
Saturn LIII
250 moon of Saturn r · M
2005 YU55
308635
180 NEA;[88] Apollo; PHO[89] [90] · M
4660 Nereus
165 NEA; Apollo [91] · M
(357439) 2004 BL86 162.5 NEA; Apollo—binary r · M
99942 Apophis 162.5 0.05 NEA; Aten; PHO [92] · [87]
S/2009 S 1
150 moon of Saturn r · M
2010 TK7 150 Earth trojan; Apollo r · M
2007 TU24
125 NEA; Apollo; PHO [93] · M
2002 JE9 100 NEA; Apollo; PHO r · M
2010 XC15 100 NEA; Apollo; PHO r · M
1994 WR12 65 0.002 NEA; Aten [94] · [87]
2009 FD
410777		 65 0.0028 NEA; Apollo [95] · [95]
2008 HJ 18 0.000005 NEA & fast rotator (42 s)[96] [96] · [96]
367943 Duende
2012 DA14		 15 NEA r · M
1998 KY26 15 NEA & fast rotator (10 m) [97] · 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

ag 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

    References

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    Further reading

    External links

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