List of Solar System objects by size

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Objects in the
Solar System
Categories
The image is of the masses of the heaviest objects

This is a list of Solar System objects by size, arranged in descending order of mean volumetric radius. The list can also be partially sorted according to an object's mass and, for the largest objects, volume, density and surface gravity. 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 bigger than Neptune but less massive, and although Ganymede and Titan are larger than Mercury, they have less than half its 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. These are dubbed "regular". Objects made of ice become regular more easily than those made of rock, and many icy objects are spheroidal at far lower sizes. The cutoff boundary for regularity 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, while 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, but a characteristic feature of the "irregular"-shaped bodies is that there is a significant difference in the length of their two equatorial diameters.

There can be difficulty in figuring out 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 "unreferenced wiki-assumed" masses/densities. Many TNOs are just assumed to have a density of 2.0 g/cm3, though it is just as likely that they have a comet-like density of only 0.5 g/cm3.[2] Thus most provisional TNOs are not given an MEarth value to prevent from cluttering the list with too many assumptions that could be off by an order of magnitude. 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 with assumed densities.[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 the 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.

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

  • The relative masses of the Solar planets. Jupiter at 71% of the total and Saturn at 21% dominate the system. Mercury and Mars, which together are less than 0.1%, are not visible at this scale.

  • The 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.

  • The relative masses of the moons of the Solar System. Mimas, Enceladus, and Miranda are too small to be visible at this scale. All the irregularly shaped moons, even added together, would also be too small to be visible. Here the Moon is called "Luna".

Contents

List [edit]

Objects above ≈400 km in radius [edit]

Anything above this size is probably in hydrostatic equilibrium. Some bodies listed near the end might not be if their predicted or measured size is "grossly in error" or their composition primarily rocky.[5] A lot of the values are manually calculated assuming sphericity. Size may or may not include an object's atmosphere. The diameter of Saturn's rings is around 364,900 km, much wider than Jupiter, but its gaseous sphere is smaller.

Body Image Mean radius
(km)		 Mean radius
(R⊕)		 Volume
(109 km3)		 Volume
(V⊕)		 Mass
×1021 kg
(Yg)		 Mass
(M⊕)		 Density
[note 1]
g/cm3		 Surface gravity
(m/s2)		 Surface gravity
(⊕)		 Type of object Shape
Sun The Sun by the Atmospheric Imaging Assembly of NASA's Solar Dynamics Observatory - 20100819.jpg 696,000 109.25 1,412,000,000 1,303,781 1,989,100,000 332,837 1.409 274.0 28.02 Star regular
Jupiter Jupiter by Cassini-Huygens.jpg 69,911 10.97 1,431,280 1,321 1,898,600 317.83 1.33 24.79 2.535 Planet (gas giant) regular
Saturn Saturn during equinox cropped.jpg 58,232
(w/o rings)		 9.14 827,130 764 568,460 95.159 0.70 10.445 1.06 Planet (gas giant) regular
Uranus Uranus2.jpg 25,362 3.98 68,340 63.1 86,832 14.536 1.30 8.87 0.90 Planet (gas giant) regular
Neptune Neptune.jpg 24,622 3.86 62,540 57.7 102,430 17.147 1.76 11.15 1.140 Planet (gas giant) regular
Earth The Earth seen from Apollo 17.jpg 6,371.0 1 1,083.21 1 5,973.6 1 5.515 9.78033 0.99732 Planet (terrestrial) regular
Venus Venus-real.jpg 6,051.8
(w/o gas)		 0.950 928.43 0.857 4,868.5 0.815 5.24 8.872 0.905 Planet (terrestrial) regular
Mars Mars Hubble.jpg 3,390.0 0.532 163.18 0.151 641.85 0.107 3.94 3.7 0.38 Planet (terrestrial) regular
Ganymede†
Jupiter III		 Noaa ganymede.jpg 2,631.2 0.413 76.30 0.0704 148.2 0.0248 1.936 1.428 0.15 Satellite of Jupiter regular
Titan†
Saturn VI		 Two Halves of Titan.png 2,576[6]
(w/o gas)		 0.404 71.52 0.0660 134.5 0.0225 1.88 1.354 0.14 Satellite of Saturn regular
Mercury Mercury in color - Prockter07 centered.jpg 2,439.7 0.383 60.83 0.0562 330.2 0.0553 5.43 3.7 0.38 Planet (terrestrial) regular
Callisto†
Jupiter IV		 Callisto.jpg 2,410.3 0.378 58.65 0.0541 107.6 0.018 1.83 1.23603 0.126 Satellite of Jupiter regular
Io†
Jupiter I		 Io highest resolution true color.jpg 1,821.5 0.286 25.32 0.0234 89.3 0.015 3.528 1.797 0.183 Satellite of Jupiter regular
Moon
Earth I		 FullMoon2010.jpg 1,737.1 0.273 21.958 0.0203 73.5 0.0123 3.3464 1.625 0.166 Satellite of Earth regular
Europa†
Jupiter II		 Europa-moon.jpg 1,561 0.245 15.93 0.0147 48 0.00803 3.01 1.316 0.134 Satellite of Jupiter regular
Triton†
Neptune I		 Triton Voyager 2.jpg 1,353.4 0.212 10.38 0.0096 21.5 0.00359 2.061 0.782 0.0797 Satellite of Neptune regular
ErisR
136199		 Eris and dysnomia2.jpg 1,163±6[7] 0.182 7 0.007 16.7[8] 0.0027 2.5 0.662 0.0677 Dwarf planet—SDO—binary regular
PlutoR
134340		 Pluto-map-hs-2010-06-c180.jpg 1,161[9]
(w/o gas)		 0.181 7 0.0066 13.105 0.0022 2.0 0.61 0.062 Dwarf planet—
KBO		 regular
Titania‡
Uranus III		 Titania (moon) color cropped.jpg 788.9 0.124 2.06 0.0019 3.526 0.00059 1.72 0.378 0.0385 Satellite of Uranus regular
Rhea‡
Saturn V		 PIA07763 Rhea full globe5.jpg 764.1[10] 0.12 1.87 0.0017 2.3166 0.00039 1.23 0.26 0.027 Satellite of Saturn regular
Oberon†
Uranus IV		 Voyager 2 picture of Oberon.jpg 761.4 0.12 1.85 0.0017 3.014 0.0005 1.63 0.347 0.035 Satellite of Uranus regular
MakemakeRA
136472		 Makemake hubble.png 740±20[11] 1.7 3 0.00067 1.7[11] 0.4 Dwarf planet—
KBO		 regular
Iapetus†
Saturn VIII		 Iapetus as seen by the Cassini probe - 20071008.jpg 735.6[12] 0.113 1.55 0.0014 1.9739 0.00033 1.08 0.223 0.0227 Satellite of Saturn regular
2007 OR10
225088
"Snow White"		 640±100[13] 0.1 1.0981 0.00101 SDO unknown
HaumeaR
136108		 620±30 0.117 1.3–1.6 0.001 4.006 0.00069 2.55[14] 0.44 0.045 Dwarf planet—
KBO—trinary		 regular (scalene ellipsoid)
Charon†
Pluto I		 Charon.png 603.5[15] 0.095 0.87 0.0008 1.52 0.00025 1.65 0.279 0.028 Satellite of Pluto regular
Umbriel†
Uranus II		 Umbriel moon 1.gif 584.7 0.092 0.84 0.0008 1.2 0.00020 1.4 0.234 0.024 Satellite of Uranus regular
Ariel ‡
Uranus I		 Ariel-NASA.jpg 578.9 0.091 0.81 0.0008 1.35 0.00022 1.67 0.269 0.027 Satellite of Uranus regular
Dione†
Saturn IV		 Dione-PIA07746.jpg 561.6 0.088 0.73 0.0007 1.096 0.000183 1.48 0.232 0.0236 Satellite of Saturn regular
Quaoar
50000		 Quaoar PRC2002-17e.jpg 540±20 0.07 0.37 0.0003 1.6[16] 0.0003 4.2[16] 0.125 0.013 KBO—Cubewano—binary unknown
Tethys‡
Saturn III		 PIA07738 Tethys mosaic contrast-enhanced.jpg 533 0.083 0.624 0.0006 0.6173 0.000103 1.15 0.145 0.015 Satellite of Saturn regular
SednaRA
90377		 Sedna PRC2004-14d.jpg 500±40[17] 0.08 TNO—Detached object[18] unknown
Ceres‡
1		 Ceres optimized.jpg 471 0.076 0.437 0.0004 0.95 0.000159 2.08 0.27 0.0275 Dwarf planet—Asteroid regular
2002 MS4
307261		 470±25[19] 0.07 KBO[18] unknown
OrcusRA
90482		 Orcus nasa.jpg 460±10 0.06 0.23 0.0002 2.47[20] KBO—Plutino—binary unknown
2005 UQ5139
202421		 460 0.06 0.22 0.0002 0.886P 0.0001 2.0 0.278 0.0284 KBO—Cubewano unknown
Salacia
120347		 430±20 0.07 0.45 1.16[21] 0.147 KBO—binary unknown
2003 MW129
174567		 410 0.06 0.22 0.0002 0.616P 0.0001 2.0 0.228 0.02 KBO unknown

Objects between ≈400 and ≈200 km in radius [edit]

Most objects in this size range are expected to be round. All the satellites except Proteus are round. The asteroid 10 Hygiea is not, and 2 Pallas and 4 Vesta are borderline. Like the satellites, TNOs in this size range are expected to be round (assuming the estimated size is correct).

Body Image Mean radius
(km)		 Mean radius
(R⊕)		 Volume
(109 km3)		 Volume
(V⊕)		 Mass
×1021 kg
(Yg)		 Mass
(M⊕)		 Density
[note 1]
g/cm3		 Surface gravity
(m/s2)		 Surface gravity
(⊕)		 Type of object Shape
2006 QH1819 380 0.06 0.233 0.000215 0.467P 0.00008 2.0 0.214 0.022 SDO unknown
2002 AW197R
55565		 2002AW197-Spitzer.jpg 367[5] 0.06 0.207 0.00019 0.414P 0.000069 2.0 0.206 0.0211 KBO[18] unknown
2003 AZ84R
208996		 363.5[22] 0.06 KBO—Plutino—binary unknown
Dysnomia
Eris I		 342.5[13] Satellite of Eris unknown
2002 UX25R
55637		 UX25-LB1-2009Nov19-06UT.jpg 340.5[5] 0.0535 0.166 0.000153 0.331P 0.0000554 2.0 0.191 0.01952 KBO—binary unknown
2007 JJ43
278361		 338.5[5] TNO[18] unknown
2004 GV9R
90568		 338.5[5] 0.0531 0.162 0.00015 0.325P 0.0000534 2.0 0.19 0.0194 KBO unknown
2005 RN439
145452		 330.5[5] 0.0573 0.2036 0.00019 0.407P 0.000068 2.0 0.205 0.02096 KBO[18] unknown
2010 KZ39 330.5[5] TNO—Detached object[23] or Cubewano[24] unknown
IxionRA
28978		 325[5] 0.051 0.144 0.000133 0.3 5.0E-5 2.086 0.19 0.021 KBO—Plutino unknown
2004 XA192
230965		 322[5] 0.055 0.177 0.00016 0.354P 0.000059 2.0 0.195 0.02 TNO[18] unknown
2001 UR1639
42301		 306.5[5] 0.05 0.134 0.00012 0.269P 0.000045 2.0P 0.178 0.018 SDO[18] unknown
2010 RF43 306.5[5] SDO unknown
2003 UZ4139 306.5[5] 0.048 0.116 0.00012 0.33P 0.000055 2.0P 0.241 0.0246 KBO—Plutino unknown
2004 PF115
175113		 306.5[5] KBO—Plutino unknown
Chaos
19521		 300[19] 0.0585 0.216 0.0002 0.4328P 0.00007 2.0P 0.209 0.021 KBO—Cubewano unknown
2007 UK1269
229762		 300[13] SDO unknown
2008 ST291 299[5] SDO unknown
2010 RE64 299[5] KBO unknown
2010 FX86 299[5] KBO—Cubewano unknown
2002 TC302
84522		 292[25] 2:5 resonance unknown
(119951) 2002 KX149 292[5] KBO unknown
2005 RM439
145451		 292[18] 0.0455 0.102 0.00009 0.2P 0.000034 2.0P 0.159 0.016 KBO unknown
2004 XR190 292[18] 0.059 0.221 0.0002 0.4416P 0.00007 2.0P 0.21 0.0215 SDO[18] unknown
2004 NT33 292[18] 0.043 0.089 0.000082 0.178P 0.000029 2.0P 0.155 0.0158 KBO—Cubewano[18] unknown
2004 TY364*
120348		 284,5[18] 0.043 0.089 0.000082 0.178P 0.000029 2.0P 0.155 0.0158 KBO[18] unknown
2010 VK201 284.5[5] Cubewano[18] unknown
2002 XV93 274.6[22] KBO—Plutino[18] unknown
Pallas$
2		 PallasHST2007.jpg 272.5[26] 0.211 0.0000353 2.8[27] 0.19 0.02 Asteroid uncertain
2004 PR107 264.5[18] 0.0345 0.0446 0.00004 0.089P 0.000014 2.0P 0.123 0.0126 KBO unknown
Vesta$
4		 Vesta full mosaic.jpg 262.7[28] 0.259076 3.456[28] 0.252 Asteroid regular?
2003 VS2
84922		 2003VS2-mag20.jpg 261.5[22] KBO—Plutino[18] unknown
2003 QX113 252.5[18] 0.036 0.051 0.00005 0.102P 0.000017 2.0P 0.129 0.013 SDO[18] unknown
Enceladus‡
Saturn II		 Enceladus from Voyager.jpg 252.1 0.039 0.067 0.00006 0.108 0.0000181 1.61 0.111 0.0113 Satellite of Saturn regular
2010 VZ98 251.5[5] SDO[18] unknown
2011 FW62 251.5[5] Classical unknown
Varuna*
20000		 250[5] 0.049 0.125 0.000115 0.37 6.2E-5 0.992[14] 0.258 0.028 KBO unknown
2010 TJ 239[5] SDO[18] unknown
2010 TY53 239[5] TNO — centaur[18] unknown
2011 GM27 239[5] SDO unknown
2006 HH123 239[5] 0.031 0.0335 0.000011 0.067P 0.000011 2.0 0.112 0.011 Centaur[18] unknown
Miranda‡
Uranus V		 Miranda.jpg 235.8 0.037 0.055 0.00005 0.0659 0.000011 1.20 0.0791 0.00806 Satellite of Uranus regular
2010 EK139 235[17] SDO unknown
2005 TB190
145480		 232[13] TNO—Detached object[18] unknown
1999 DE9
26375		 230.5[29] 0.036 0.051 0.000047 0.1026P 0.000017 2.0 0.129 0.013 KBO unknown
2003 FY128
120132		 230[13] SDO[18] unknown
1998 SN165*
35671		 230[18] 0.036 0.05 0.000046 0.1P 0.000017 2.0 0.128 0.013 KBO unknown
2002 VR128
84719		 2003VS2-mag20.jpg 224.3[22] KBO—Plutino[18] unknown
HuyaR
38628		 219.4[22] KBO—Plutino unknown
1999 CD158 210[18] 0.0345 0.0446 0.00004 0.089P 0.000014 2.0 0.123 0.0126 KBO unknown
Proteus ‡A
Neptune VIII (8)		 Proteus (Voyager 2).jpg 210 0.033 0.038 0.000035 0.050 0.00000844 1.3[30] 0.0666 0.00678 Satellite of Neptune irregular
2001 QF298 204.1[22] KBO—Plutino[18] unknown
2005 QU1829
303775		 204[13] SDO[18] unknown
10 Hygiea$ 203.6[31] 0.03 0.04 3.0E-5 0.0885 1.0E-5 2.5 0.143 0.02 Asteroid irregular
2000 YW134*
82075		 202[18] 0.039 0.065 0.00006 0.13P 0.000022 2.0P 0.139 0.014 SDO[18] unknown
2002 WC19
119979		 200.5[32] 0.0315 0.034 0.00003 0.0675P 0.000011 2.0 0.113 0.0115 KBO—binary unknown
1996 GQ21*
26181		 200.5[18] 0.031 0.0335 0.000011 0.067P 0.000011 2.0 0.112 0.011 SDO[18] unknown

Objects between 200 and 100 km in radius [edit]

Objects between 200 and 100 km in radius (400 and 200 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. Values relative to Earth are not included beyond this point. 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).[33] This is not complete, missing many poorly known TNOs.[18]

Satellites of Saturn
Satellites of Neptune
Body Image Mean radius
(km)		 Mass
×1018 kg
(Zg)		 Type of object Shape
2004 UX10
144897		 199[22] KBO unknown
Mimas‡
Saturn I		 Mimas moon.jpg 198.3 37.49 Satellite of Saturn regular
2007 TG422 193.5[5] TNO unknown
Hiʻiaka
Haumea I		 195[34] 20 Satellite of Haumea unknown
2003 QW90
307616		 191.5[18] Cubewano unknown
2002 CY248 191.5[18] KBO unknown
Vanth
Orcus I		 189[20] Satellite of Orcus unknown
1993 SC
15789		 181.5[18] Trans-Neptunian object—plutino[18] unknown
1995 TL8*
48639		 175 Kuiper belt object—binary unknown
Nereid A
Neptune II
Nereid-Voyager2.jpg
 170 31 Satellite of Neptune irregular
Altjira 9
148780		 170[18] Trans-Neptunian object—cubewano unknown
1996 TL66RA
15874		 169.5[13] SDO unknown
2001 FP185
82158		 166[13] SDO unknown
2000 GN171
47932		 160.5[29] Trans-Neptunian object—plutino unknown
Interamnia M
704		 158.31[35] 37 Main-belt asteroid—F-type unknown
1995 SN55*
(lost)		 155 Centaur unknown
2007 OC10 154.5[13] KBO unknown
1999 CC1589
79978		 152[18] Scattered-disc object unknown
Actaea
Salacia I		 151.5[21] Satellite of 120347 Salacia unknown
Europa$
52
52Eur-LB1-richfield.jpg
 150.4 16.5 Main-belt asteroid—C-type irregular[36]
Davida$
511		 144.7 43.8 Main-belt asteroid—C-type irregular
2002 TX300
55636		 TX300-2009Nov16-04UT.jpg 143[37] Kuiper belt object—Haumea family unknown
1999 TC36 (A1)
47171		 143[38] Kuiper belt object—Trinary (A1+A2+B) unknown
Sylvia$
87
CMSylvia.png
 142.8 14.78 Outer main-belt asteroid—X-type—trinary irregular[36]
1998 SM165
26308		 139.9[29] 14 Kuiper belt object—binary unknown
2012 HH2 139[5] TNO unknown
Cybele$
65		 136.5[39] 2004
118.7[40] IRAS		 17.8 Outer main-belt asteroid—C-type irregular
Hyperion
Saturn VII
Hyperion true.jpg
 135[3] 5.58 Satellite of Saturn irregular
1999 TC36 (A2)
47171		 132.5[38] Kuiper belt object—Trinary (A1+A2+B) unknown
2005 PU219 132.5[18] Scattered-disc object unknown
1999 DF99
79983		 132.5 Trans-Neptunian object—cubewano unknown
Camilla$
107		 129.4 11.2 Outer main-belt asteroid—C-type—binary irregular[41]
Chariklo
10199		 129.3[29] Centaur unknown
EuphrosyneM
31		 128 6.23 Main-belt asteroid—C-type unknown
Eunomia$
15		 127.7[42] 31.2 Main-belt asteroid—S-type irregular[36]
1999 KR16
40314		 127[13] Trans-Neptunian object unknown
2000 CR105*A
148209		 126.5[18] 13 TNO—Detached object[18] unknown
2002 VU130
307463		 126.5[22] KBO—Plutino unknown
2005 RR43
145453		 126
348.4[18]		 Kuiper belt object—Haumea family unknown
2002 VE95
55638		 124.9[22] KBO—Plutino unknown
2007 RW10 123.5[13] SDO unknown
S/2007 (148780) 1
Altjira I		 123[43] Secondary of 148780 Altjira unknown
Sila9
79360		 121.5[18] 11 Kuiper belt object—binary unknown
2002 CY224
119878		 121[18] 15 Scattered disc object unknown
Juno$
3
Juno 4 wavelengths.jpg
 116.96[35] 26.7 Main-belt asteroid—S-type irregular[36]
Chiron*A
2060
95P/Chiron		 116.7 10 Centaur unknown
Thisbe $
88		 116[44] 10.5 M Main-belt asteroid—B-type irregular[41]
2006 HU122 115.5[5] Very-high-inclination cubewano[45] unknown
Nunam
79360		 115 Satellite of Sila unknown
2003 OP32
120178		 115 Kuiper belt object—Haumea family unknown
2004 VN1129 115 Scattered-disc object unknown
2002 KW14 115[46] Kuiper belt object unknown
BambergaM
324		 114 10 Main-belt asteroid—C-type unknown
Patientia
451		 112.5 Main-belt asteroid unknown
Fortuna $
19		 112.5[47] 12.7 Main-belt asteroid—G-type unknown
Herculina
532		 111 Main-belt asteroid—S-type irregular[36]
Doris
48		 110.9[48] 17A Main-belt asteroid irregular
2005 NU125 110.5[5] Very-high-inclination cubewano[49] unknown
Ursula
375
375Ursula-LB1.jpg
 108[50] Main-belt asteroid unknown
EugeniaM
45		 107 5.69 Main-belt asteroid—F-type—trinary irregular[36]
Phoebe $
Saturn IX
Phoebe cassini.jpg
 106.6 8.29 Satellite of Saturn formerly
regular[51]
Amphitrite$
29		 106 11.8 Main-belt asteroid—S-type irregular[36]
Deucalion
53311		 105.5[18] Trans-Neptunian object—cubewano unknown
1997 CU29
33001		 105.5 Trans-Neptunian object—cubewano unknown
DiotimaA
423		 104.385[35] 16 Main-belt asteroid—C-type irregular[52]
1999 RD215
181902		 104.33[18] Scattered disc object unknown
EgeriaM
13		 103.82[35] 16.3 Main-belt asteroid—G-type unknown
Bienor
54598		 103.5[53] Centaur unknown
Aurora
94		 102.5 Main-belt asteroid irregular[54]
HektorA
624
624Hektor-LB1-mag15.jpg
 101.5[55] 14 Asteroid—Jupiter Trojan—binary irregular
Rhadamanthus
38083		 100.5[18] Kuiper belt object unknown
1996 TO66
19308		 100 Kuiper belt object—Haumea family unknown

Selected objects between 100 and 50 km in radius [edit]

Objects 100 and 50 km in radius (200 km to 100 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the gas giants in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following reference:.[18] Asteroid spectral types are mostly Tholen, but some might be SMASS.

Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Body Image Mean radius
(km)		 Mass
×1018 kg
(Zg)		 Type of object
7 Iris$
7Iris-LB1-richfield-mag10.jpg
 99.915 [56] 13.6 Main-belt asteroid—S-type
24 Themis M 99 11.3 Main-belt asteroid—C-type—Themis
702 Alauda
702Ala-mag13-occult.jpg
 97.4[35] 6.05 Main-belt asteroid—C-type—binary
LarissaA
Neptune VII (7)
Larissa 1.jpg
 97 4.2 Satellite of Neptune
(85633) 1998 KR65 96[18] Kuiper belt object—cubewano
121 HermioneM 95 5.38 Outer main-belt asteroid—C-type—binary
372 Palma 94.31[57] Main-belt asteroid
128 Nemesis 94.1 7 Main-belt asteroid—C-type
16 Psyche$ 93.0 21.9 Main-belt asteroid—M-type
6 Hebe $ 92.59[35] 12.8 Main-belt asteroid—S-type
5145 Pholus 92.5[58] 6.6 Centaur
154 Bertha 92.47[35] 5.2 Main-belt asteroid—C-type
76 Freia 91.83 6.5 Outer main-belt asteroid—Cybele
(59358) 1999 CL1589 91.5 Trans-Neptunian object—unstable
130 ElektraM 91.1[35] 6.6 Asteroid—G-type—binary
2006 RJ103 90[59] Neptune trojan
Janus$
Saturn X (10)
PIA12714 Janus crop.jpg
 89.4 1.912 Satellite of Saturn
259 Aletheia 89.3[35] 5.97 Main-belt asteroid
Galatea
Neptune VI (6)
Galatea moon.jpg
 88[3] 2.12 Satellite of Neptune
88611 Teharonhiawako 88[18] Trans-Neptunian object—cubewano—binary
42355 Typhon 87.5[29] Trans-Neptunian object—binary
(19255) 1994 VK8 87.5[18] 5.6 Trans-Neptunian object—cubewano
120 Lachesis 87.05[35] 5.5 Main-belt asteroid
65489 Ceto 87[60] 5.4[60] Centaur—TNO—binary
(24835) 1995 SM55 87 Kuiper belt object—Haumea family
41 Daphne 87 Main-belt asteroid
9 Metis$ 86.9 11.3 Main-belt asteroid
747 Winchester 85.86[35] Asteroid
153 Hilda 85.32[35] 5.2 Main-belt asteroid—Hildas
790 Pretoria 85.2[61] Outer main-belt asteroid—Cybele
Himalia M
Jupiter VI (6)
Cassini-Huygens Himalia.jpg
 85[3]–92[62] 4.19 [63] Satellite of Jupiter—Himalia group
Namaka
Haumea II		 85 2 Satellite of Haumea
96 Aegle 84.95 5.1 Main-belt asteroid
241 Germania 84.45[35] 5.05 Main-belt asteroid—C-type
194 Prokne 84.21[35] 5 Main-belt asteroid—C-type
566 Stereoskopia[64] 84.08[35] Outer main-belt asteroid—Cybele
Amalthea
Jupiter V (5)
Amalthea (moon).gif
 83.5[65] 2.08[66] Satellite of Jupiter$
911 Agamemnon 83.3[35] Asteroid—Jupiter Trojan
22 Kalliope 83.1[67] 8.09M Main-belt asteroid—M-type—binary
66652 Borasisi 83[18] Trans-Neptunian object—cubewano—binary
54 Alexandra 82.88 Main-belt asteroid
386 Siegena 82.5[68] Main-belt asteroid—C-type
59 Elpis 82.4 Main-belt asteroid
1437 Diomedes 82.16[35] 4.6 Asteroid—Jupiter Trojan
2002 XU93
127456		 82[13] Scattered-disc object
444 GyptisM 81.54[35] 12.5 Main-belt asteroid—C-type
Puck
Uranus XV (15)
Puck.png
 81[3] 2.9A Satellite of Uranus
409 Aspasia 80.81[35] 4.42 Main-belt asteroid—C-type
S/2002 (48639) 1 80.5 Satellite of (48639) 1995 TL8
20461 Dioretsa 80.2[18] Centaur[69]—Damocloid
1992 QB1 80[18] Kuiper belt object—cubewano
2007 VL305 80[59] Neptune trojan
(15875) 1996 TP66 80[29] Kuiper belt object— inner plutino
209 Dido 79.97[35] 4.28 Main-belt asteroid—C-type
334 Chicago 79.275[35] Main-belt asteroid—C-type
804 Hispania 78.79[35] 9.95 Main-belt asteroid—P-type
185 Eunike 78.76[35] 4.09 Main-belt asteroid
139 Juewa 78.3[35] 4 Main-belt asteroid
354 Eleonora 77.585[35] Main-belt asteroid—S-type
85 Io 77.4[70] 3.4 Main-belt asteroid
165 Loreley 77.39[35] 3.91 Main-belt asteroid—C-type
173 Ino 77.05[35] 3.83 Main-belt asteroid—C-type
11 Parthenope 76.67[35] 6.15M Main-belt asteroid
(137295) 1999 RB216 76.5[18] Kuiper belt object—twotino
14 Irene 76[71] 8.2 Main-belt asteroid
89 Julia 75.75 3.6 Main-belt asteroid—S-type
536 Merapi 75.7[35] Main-belt asteroid
(145474) 2005 SA278 75.62[18] Scattered-disc object
776 Berbericia 75.59[35] Main-belt asteroid
145 Adeona 75.57[35] 3.6 Main-belt asteroid—Adena
150 Nuwa 75.565[35] 3.62 Main-belt asteroid—C-type
DespinaA
Neptune V (5)
Despina.jpg
 75 2.1 Satellite of Neptune
Sycorax
Uranus XVII (17)		 75[3] 2.3 Satellite of Uranus
49 Pales M 74.9[35] 2.69 Main-belt asteroid—C-type
39 Laetitia 74.75 3.5 Asteroid
117 Lomia 74.36[35] 3.4 Main-belt asteroid—C-type
238 Hypatia 74.245[35] Main-belt asteroid—C-type
168 Sibylla 74.195[35] 3.42 Main-belt asteroid—C-type
283 EmmaM 74 1.38 Asteroid—binary
51 Nemausa 73.93 Asteroid
106 Dione 73.3 Main-belt asteroid—G-type
(118378) 1999 HT11 73[18] Trans-Neptunian object
137 Meliboea 72.71[35] 3.2 Main-belt asteroid
20 Massalia$ 72.5 5.67 Asteroid
211 Isolda 71.6[35] 3.07 Main-belt asteroid—C-type
1172 Äneas 71.41[72] Asteroid—Jupiter Trojan
144 Vibilia 71.19[35] 3 Main-belt asteroid
508 Princetonia 71.18[35][73] Main-belt asteroid
895 Helio 70.95 [35] Main-belt asteroid—B-type
361 Bononia 70.86 [35] Main-belt asteroid—D-type
420 Bertholda 70.625 [35] Main-belt asteroid—P-type
93 Minerva 70.5 2.9 Main-belt asteroid—C-type—trinary
617 Patroclus 70.46 [35] Asteroid—Jupiter Trojan—binary
308 Polyxo 70.345[35] 2.92 Main-belt asteroid—T-type
18 Melpomene 70.3 3 Main-belt asteroid
2001 QR322 70[59] Neptune trojan
268 Adorea 69.945[35] 2.87 Main-belt asteroid
349 Dembowska 69.885[35] Main-belt asteroid—R-type
489 Comacina 69.695 [35] Main-belt asteroid
(47171) 1999 TC36(B) 69.5[38] Kuiper belt object—Trinary (A1+A2+B)
69 Hesperia 69.07 2.76 Main-belt asteroid—M-type
2003 UZ117 69 Kuiper belt object—Haumea family
762 Pulcova 68.54 [35] Main-belt asteroid—C-type—binary
Pabu
Borasisi I		 68.5[74] Secondary of 66652 Borasisi
196 Philomela 68.195[35] 2.65 Main-belt asteroid—S-type
212 Medea 68.06[35] 2.64[75] Main-belt asteroid
95 Arethusa 68.02[35] 2.6 Main-belt asteroid
Portia
Uranus XII (12)		 67.6[3] 1.7 Satellite of Uranus
588 Achilles 67.735 [35] Asteroid—Jupiter Trojan
690 Wratislavia
690Wrat-mag13-100yrs.jpg
 67.325 [35] Asteroid
111 Ate 67.28 Main-belt asteroid—C-type
247 Eukrate 67.215[35] Main-belt asteroid—C-type
705 Erminia 67.11[35] Main-belt asteroid
471 Papagena 67.095 [35] Main-belt asteroid—C-type
Phorcys
Ceto I		 67[18] 1.67[60] Satellite of 65489 Ceto
1998 WW31 66.5 2 Trans-Neptunian object—binary
147 Protogeneia 66.465[35] 2.5 Main-belt asteroid
Menoetius
Patroclus I		 66.3 Secondary of 617 Patroclus
344 Desiderata 66.135[35] 2.42 Main-belt asteroid—C-type
146 Lucina 66.1[35] 2.4 Main-belt asteroid
141 Lumen 65.52[35] 1.6 Main-belt asteroid—C-type
356 Liguria 65.655 [35] Main-belt asteroid
187 Lamberta 65.2 [35] 2.37 Main-belt asteroid—C-type
419 Aurelia 64.505 [35] Main-belt asteroid—F-type
200 Dynamene 64.18[35] Main-belt asteroid
8 Flora 63.9 8.47 Main-belt asteroid—S-type—Flora
712 Boliviana 63.785 [35] Main-belt asteroid—X-type
654 Zelinda 63.7 [35] Main-belt asteroid
426 Hippo 63.55 [35] Main-belt asteroid
47 Aglaja pic 63.48 Main-belt asteroid—C-type
279 Thule 63.295[35] Main-belt asteroid—D-type
92 Undina 63.21[76] 2.1 Main-belt asteroid—M-type
1173 Anchises 63.135[35] Asteroid—Jupiter Trojan
1143 Odysseus 62.82[35] Asteroid—Jupiter Trojan (L4)
469 Argentina 62.785 [35] Main-belt asteroid—Cybele
159 Aemilia 62.5 1.4 Asteroid
405 Thia 62.45 [35] Main-belt asteroid—C-type
602 Marianna 62.36 [35] Main-belt asteroid
46 Hestia 62.07[35] 3.5[77]–21[78] Main-belt asteroid
216 Kleopatra Kleopatra.jpg 62 Main-belt asteroid—M-type—trinary
104 Klymene 61.9 2 Main-belt asteroid
410 Chloris 61.785 [35] Main-belt asteroid—C-type
134 Sophrosyne 61.64 2 Main-belt asteroid
328 Gudrun 61.46[35] 1.94 Main-belt asteroid—S-type
1867 Deiphobus 61.335[35] Asteroid—Jupiter Trojan
68 Leto 61.3 Main-belt asteroid—S-type
70 Panopaea 61.01 Main-belt asteroid—C-type
Sawiskera
Teharonhiawako I		 61 Secondary of 88611 Teharonhiawako
127 Johanna 61[79] Main-belt asteroid
276 Adelheid 60.8[35] Main-belt asteroid
176 Iduna 60.52[35] 1.76 Main-belt asteroid—G-type
156 Xanthippe 60.495[35] 1.85 Main-belt asteroid—S-type
28 Bellona 60.45[35] Main-belt asteroid—C-type
86 Semele 60.3 Main-belt asteroid—C-type
78 Diana 60.3 Main-belt asteroid—C-type
381 Myrrha 60.29 [35] Main-belt asteroid—C-type—
225 Henrietta 60.245[35] 1.83 Main-belt asteroid—C-type—Cybele
618 Elfriede 60.145 [35] Main-belt asteroid—C-type—
105 Artemis 59.6 1.8 Main-belt asteroid—C-type
81 Terpsichore 59.54 Main-belt asteroid—C-type
5 Astraea 59.535[35] 2.9 Main-belt asteroid
74 Galatea 59.36 1.8 Main-belt asteroid—C-type
350 Ornamenta 59.175[35] Main-belt asteroid—C-type
772 Tanete 58.83[35] Main-belt asteroid—C-type
476 Hedwig 58.38 [35] Main-belt asteroid
1093 Freda 58.365 [35] Main-belt asteroid
171 Ophelia 58.35[35] 1.66 Main-belt asteroid—C-type—Themis
909 Ulla 58.22[35] Asteroid
3317 Paris 58.13[35] Asteroid—Jupiter Trojan
203 Pompeja 58.125[35] Main-belt asteroid
3063 Makhaon 58.07[35] 1.6 Asteroid—Jupiter Trojan
2006 SQ372
308933		 58[5] TNO
38 Leda 57.97[35] 1.6 Asteroid
360 Carlova 57.88[35] Main-belt asteroid—
521 Brixia 57.825 [35] Main-belt asteroid—
490 Veritas 57.775[35] Main-belt asteroid—Veritas
466 Tisiphone 57.765 [35] Main-belt asteroid—C-type
53 Kalypso 57.69 Asteroid
2241 Alcathous 57.315 [35] Asteroid—Jupiter Trojan
388 Charybdis 57.085 [35] Main-belt asteroid—C-type
34 Circe 56.75 1.5 Main-belt asteroid—C-type
Epimetheus
Saturn XI (11)
PIA09813 Epimetheus S. polar region.jpg
 56.7[3] 0.5304[80] Satellite of Saturn$
596 Scheila 56.67 [35] Main-belt asteroid
56 Melete 56.62 1.5 Asteroid
129 Antigone 56.5[81] 2 Main-belt asteroid—nickel-iron
12 Victoria 56.4 Main-belt asteroid—S-type
57 Mnemosyne 56.3 Asteroid
2002 PN34
73840		 56[13] Scattered-disc object
545 Messalina 55.645 [35] Asteroid
2797 Teucer 55.57[35] Asteroid—Jupiter Trojan(L4)
2920 Automedon 55.5[35] Asteroid—Jupiter Trojan(L4)
91 Aegina 54.9 1.4 Main-belt asteroid—C-type
140 Siwa 54.895 [35] 1.4 Main-belt asteroid
814 Tauris 54.78[35] Main-belt asteroid
595 Polyxena 54.535 [35] Main-belt asteroid
230 Athamantis 54.495 Main-belt asteroid—S-type
659 Nestor 54.435 [35] Asteroid—Jupiter Trojan
37 Fides 54 1.3 Main-belt asteroid—S-type
514 Armida 53.085 [35] Main-belt asteroid
23 Thalia 53.8 1.3 Main-belt asteroid—S-type
739 Mandeville 53.765 [35] Main-belt asteroid—X-type
40 Harmonia 53.6 1.3 Main-belt asteroid—S-type
181 Eucharis 53.33[35] 1.2 Main-belt asteroid—K-type
346 Hermentaria 53.26 [35] Main-belt asteroid—S-type
357 Ninina 53.05 [35] Main-belt asteroid
506 Marion 52.97 [35] Main-belt asteroid—C-type
365 Corduba 52.96 [35] Main-belt asteroid—C-type
36 Atalante 52.8 Asteroid
713 Luscinia 52.76 [35] Main-belt asteroid—C-type
1269 Rollandia 52.595[35] Main-belt asteroid
164 Eva 52.435[35] 1.21 Main-belt asteroid—C-type
98 Ianthe 52.25 1.2 Main-belt asteroid—C-type
240 Vanadis 51.95 [35] Main-belt asteroid—C-type
221 Eos 51.935[35] 1.17 Main-belt asteroid—K-type
(29981) 1999 TD10 51.85[29] Trans-Neptunian object
788 Hohensteina 51.84[35] Main-belt asteroid
791 Ani 51.76[35] Main-belt asteroid
1208 Troilus 51.67[35] Asteroid—Jupiter Trojan
192 Nausikaa 51.63[35] Main-belt asteroid—S-type
63 Ausonia 51.57 1.1 Main-belt asteroid—S-type
35 Leukothea 51.555[35] 1.1 Main-belt asteroid—C-type
570 Kythera 51.405 [35] Main belt asteroid
233 Asterope 51.39 [35] 1.4 Main belt asteroid—T-type
4063 Euforbo 51.23[35] Asteroid—Jupiter Trojan
1583 Antilochus 50.81[35] Asteroid—Jupiter Trojan
1390 Abastumani 50.79[35] Main-belt asteroid
522 Helga 50.61 [35] Main-belt asteroid—Cybele
175 Andromache 50.585[35] 1.08 Main-belt asteroid—C-type
191 Kolga 50.515[35] 1.08 Main-belt asteroid—C-type
663 Gerlinde 50.44 [35] Asteroid
626 Notburga 50.365 [35] Asteroid
387 Aquitania 50.255[35] Main-belt asteroid—S-type
42 Isis 50.1 Main-belt asteroid—S-type
2008 LC18 50[59] Neptune trojan
2005 TO74 50[59] Neptune trojan
2004 UP10 50[59] Neptune trojan
30 Urania 50 Main-belt asteroid—S-type

Examples of objects between 50 km and 20 km in radius [edit]

There are easily tens of thousands of objects 50 km in radius or smaller[clarification needed], but only a fraction have been explored. 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 also List of minor planets)

Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Satellites of Pluto
Body Image Mean radius
(km)		 Mass
×1015 kg
(Eg)
 Type of object
50 VirginiaA 49.91 1000 Asteroid
114 Kassandra 49.86[35] 1000 Main-belt asteroid—T-type
1021 Flammario 49.695[35] Asteroid
162 Laurentia 49.55[35] Main-belt asteroid
401 Ottilia 49.56[35] Main-belt asteroid
ThebeA
Jupiter XIV (14)
Thebe.jpg
 49.3[3] 430 Satellite of Jupiter
148 Gallia 48.88[35] 980 Main-belt asteroid—R-type
404 Arsinoe 48.855[35] Main-belt asteroid—C-type
S/2001 (26308) 1 48[82] Satellite of (26308) 1998 SM165
27 EuterpeA 48 930 Main-belt asteroid—S-type
773 Irmintraud 47.94[35] Asteroid—D-type
21 Lutetia 47.8[35] 1700 [83] Main-belt asteroid—M-type
62 Erato 47.7 910 Main-belt asteroid—Themis
26 Proserpina 47.4[35] 900 Asteroid
345 Tercidina 47.06[35] Main-belt asteroid—C-type
JulietA
Uranus XI		 46.8[3] 560 Satellite of Uranus
58 Concordia 46.72 850 Asteroid
229 Adelinda 46.6[35] Main-belt asteroid—C-type
379 Huenna 46.2 480 Main-belt asteroid—C-type
Nix
Pluto II		 46[84] 70 Satellite of Pluto
103 Hera 45.6 790 Asteroid
17 Thetis
17Thetis-LB1.jpg
 45 1200 Asteroid
143 Adria 44.965[35] 760 Main-belt asteroid
109 Felicitas 44.7 750 Asteroid
100 Hekate 44.5[85] 1000 Asteroid
90 Antiope A 43.9[86] 410 Asteroid—C-type—binary
227 Philosophia 43.655[35] Main-belt asteroid
Prometheus $
Saturn XVI (16)
Prometheus 12-26-09a.jpg
 43.1[87] 156.6 Satellite of Saturn
110 Lydia 43.05 670 Asteroid
ElaraA
Jupiter VII		 43 870 Satellite of Jupiter—Himalia group
72 Feronia 42.95 670 Asteroid
60558 Echeclus/
174P/Echeclus		 42[29][18] Centaur[88]
S/2000 (90) 1 41.9[86] Asteroid moon of 90 Antiope
71 Niobe 41.7 610 Asteroid
102 Miriam 41.5[89] Asteroid
97 Klotho 41.4 590 Asteroid
61 Danae 41.02 Asteroid
ThalassaA
Neptune IV		 41 350 Satellite of Neptune
122 Gerda 40.85[35] 570 Main-belt asteroid—S-type
Pandora$
Saturn XVII (17)
Pandora PIA07632.jpg
 40.7[87] 135.6 Satellite of Saturn
83 Beatrix 40.69 560 Main-belt asteroid—X-type
32 PomonaA 40.5 550 Asteroid
2005 TN53 40[59] Neptune trojan
BelindaA
Uranus XIV (14)
Belinda.gif
 40 360 Satellite of Uranus
115 Thyra 39.92[35] Asteroid
Cressida
Uranus IX		 39.8[3] 340A Satellite of Uranus
135 Hertha 39.62[35] Asteroid
84 Klio 39.58[90] 520 Asteroid
80 Sappho 39.2 Asteroid
Echidna
Typhon I		 39 Satellite of 42355 Typhon
1001 Gaussia 39 Asteroid
58534 Logos 38.5[91] 270 Kuiper belt object—cubewano—binary
124 Alkeste 38.18[35] 470 Main-belt asteroid—S-type
55576 Amycus 38.15[29] Centaur
25 Phocaea 37.6 Asteroid
Weywot
Quaoar I		 37 Satellite of Quaoar
8405 Asbolus 37[92]–42[29] Centaur
112 Iphigenia 36.35[35] Asteroid
(86047) 1999 OY3 36 Kuiper belt object—Haumea family
Hydra
Pluto III		 36[3] 391P Satellite of Pluto
Rosalind*
Uranus XIII (13)		 36 250 Satellite of Uranus
Caliban
Uranus XVI (16)		 36[3] Satellite of Uranus
99 Dike 35.95 390 Asteroid
66 Maja 35.91 Asteroid
116 Sirona 35.85[35] Main-belt asteroid
44 Nysa 35.32 370 Main-belt asteroid—E-type
10370 Hylonome 35[29] Centaur
77 Frigga 34.63 350 Asteroid
55 Pandora 33.35 Asteroid
133 Cyrene 33.29[35] 310 Main-belt asteroid—S-type
79 Eurynome 33.24 Asteroid
Zoe
Logos I		 33 Satellite of 58534 Logos
Naiad
Neptune III
Naiad Voyager.png
 33 190A Satellite of Neptune
43 Ariadne 32.94[35] Asteroid
101 Helena 32.9 300 Asteroid
108 Hecuba 32.49[93] 390 Asteroid
2000 OO67
87269		 32[18] TNO
DesdemonaA
Uranus X		 32 180 Satellite of Uranus
Halimede*
Neptune IX		 31 Satellite of Neptune
52975 Cyllarus 31[29] Centaur
82 Alkmene 30.48 Asteroid
60 Echo 30.1 Asteroid
Crantor
83982		 30[94] Centaur
Comet Hale–Bopp
C/1995 O1
Hale-bopp.jpg
 30[95] Comet
Pasiphaë*A
Jupiter VIII		 30 300 Satellite of Jupiter
7066 Nessus 30[29][18] Centaur
Neso
Neptune XIII (13)		 30[3] Satellite of Neptune
64 Angelina 30[96] Main-belt asteroid—E-type
2008 KV42 29.5[97] Detached object
67 Asia 29.06 Asteroid
119 Althaea 28.65[35] 200 Main-belt asteroid—S-type
2004 KV18 28.1[98] Neptune trojan
75 Eurydike 27.955[35] 180 Main-belt asteroid—M-type
142 Polana 27.645[35] 180 Main-belt asteroid—F-type
253 Mathilde$
(253) mathilde crop.jpg
 26.4 103.3 Main-belt asteroid—C-type
52872 Okyrhoe 26.01[29] Centaur
Bianca
Uranus VIII		 25.7[3] 92 Satellite of Uranus
Prospero
Uranus XVIII (18)		 25 85 Satellite of Uranus
Setebos
Uranus XIX (19)		 24[3] 75 Satellite of Uranus
123 Brunhild 23.985[35] Main-belt asteroid
4348 Poulydamas 23.95[99] Asteroid—Jupiter Trojan
1000 Piazzia 23.89[35] Main-belt asteroid
113 Amalthea 23.07[35] 100 Main-belt asteroid
Carme*
Jupiter XI		 23 130 Satellite of Jupiter—Carme group
138 Tolosa 22.75[35] 99 Main-belt asteroid—S-type
126 Velleda 22.4[35] 94 Main-belt asteroid
73 Klytia 22.22 92 Asteroid
Sao
Neptune XI (11)		 22 Satellite of Neptune
125 Liberatrix 21.79[35] 87 Main-belt asteroid—M-type
Metis
Jupiter XVI (16)
Metis.jpg
 21.5[100] 36 Satellite of Jupiter
132 Aethra 21.435[35] 82 Main-belt asteroid—M-type
Ophelia*
Uranus VII		 21.4[3][4] 53 Satellite of Uranus
Laomedeia
Neptune XII (12)		 21 Satellite of Neptune
118 Peitho 20.87[35] 76 Main-belt asteroid
208 Lacrimosa 20.665[35] 73.9 Main-belt asteroid—Koronis—S-type
136 Austria 20.5[35] 68 Main-belt asteroid—M-type
131 Vala 20.22[35] 69 Main-belt asteroid
Cordelia*
Uranus VI		 20.1[3] 44 Satellite of Uranus
Siarnaq
Saturn XXIX (29)		 20[87] Satellite of Saturn

Examples of objects between 20 km and 1 km in radius [edit]

Satellites of Mars
Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Satellites of Pluto
Body Image Mean
radius
(km)		 Mass
×1015 kg
(Eg)
 Type of object
167 Urda 19.97[35] 66.7 Main-belt asteroid—Koronis—S-type
Hidalgo
944		 19 Centaur
Sinope*
Jupiter IX		 19 76 Satellite of Jupiter
Psamathe*
Neptune X		 19 37 Satellite of Neptune
29P/Schwassmann–
Wachmann		 29P Schwassmann Wachmann.jpg 18.65[29] Comet — centaur
Lysithea*
Jupiter X		 18 63 Satellite of Jupiter—Himalia group
158 Koronis 17.685[35] 46.3 Main-belt asteroid—Koronis—S-type
Helene
Saturn XII (12)
Dione B
Leading hemisphere of Helene - 20110618.jpg
 17.6[3] 25 Satellite of Saturn — Dione trojan
226 Weringia 16.92[35] Main-belt asteroid—S-type
433 Eros$
Eros southern hemisphere overview.jpg
 16.84 66.9 Near-Earth asteroid—Amor
Stephano
Uranus XX (20)		 16[3] 22 Satellite of Uranus
Albiorix
Saturn XXVI (26)		 16 Satellite of Saturn
1036 Ganymed 15.9 33 Near-Earth asteroid
1815 Beethoven 15.8[18] Main-belt asteroid
243 Ida
243 Ida large.jpg
 15.7[101] 42 Main-belt asteroid—Koronis—S-type—binary
Atlas$
Saturn XV (15)
Cassini Atlas N00084634 CL.png
 15.3 66 Satellite of Saturn
31824 Elatus 15[29] Centaur
Perdita
Uranus XXV (25)		 15[102] 13 Satellite of Uranus
Pan$
Saturn XVIII (18)
Pan side view.jpg
 14.2[103] 4.95[103] Satellite of Saturn
Linus
Kalliope I		 14[67] 60[104] Asteroid moon of 22 Kalliope
Ananke
Jupiter XII (12)		 14[62] 38.2 Satellite of Jupiter
Telesto
Saturn XIII (13) or Tethys B
Telesto cassini closeup.jpg
 11.8[105] Satellite of Saturn—Tethys trojan
Phobos$
Mars I
Phobos colour 2008.jpg
 11.1 10.7 Satellite of Mars
Paaliaq
Saturn XX (20)		 11 8.2 Satellite of Saturn
Francisco
Uranus XXII (22)		 11[3] 7.2 Satellite of Uranus
Calypso
Saturn XIV (14) or Tethys C
N00151485 Calypso crop.jpg
 10.7[3] Satellite of Saturn—Tethys trojan
Leda
Jupiter XIII (13)		 10[3] 11 Satellite of Jupiter—Himalia group
Ferdinand
Uranus XXIV (24)		 10[3] 5.4 Satellite of Uranus
Margaret
Uranus XXIII (23)		 10[3] 5.4 Satellite of Uranus
149 Medusa 9.88[35] 8 Main-belt asteroid
Romulus
Sylvia I		 9 4 Asteroid moon of 87 Sylvia
Ymir
Saturn XIX (19)		 9[3] Satellite of Saturn
Trinculo
Uranus XXI (21)		 9 3.9 Satellite of Uranus
Cupid
Uranus XXVII (27)		 9 3.8 Satellite of Uranus
2002 Euler 8.72 5.5 Asteroid
Adrastea
Jupiter XV (15)
Adrastea.jpg
 8.2[3] 2 Satellite of Jupiter
Kiviuq
Saturn XXIV (24)		 8[3] Satellite of Saturn
2000 Herschel 8[106] Main-belt asteroid[107]
Tarvos
Saturn XXI (21)		 Tarvos from Cassini.jpg 7.5[3] Satellite of Saturn
S/2006 (624) 1
Hektor I		 7.5 Asteroid moon of 624 Hektor
2685 Masursky
Asteroid 2685Masurky.gif
 7–10 5–11 Asteroid
(65407) 2002 RP120 7.3[108] 3.1 Damocloid (retrograde) & possible ejected SDO
Bestla
Saturn XXXIX (39)		 7 Satellite of Saturn
S/2011 (134340) 1
Pluto IV		 6.5–17 Satellite of Pluto
Petit-Prince
Eugenia I		 6.5 1.2 Asteroid moon of 45 Eugenia
Deimos$
Mars II
Deimos-MRO.jpg
 6.2 1.48 Satellite of Mars
951 Gaspra
951 Gaspra.jpg
 6.1[109] 2–3 Asteroid
Ijiraq
Saturn XXII (22)		 6 Satellite of Saturn
S/2002 (121) 1
Hermione I		 6[110] 1.6 Asteroid moon of 121 Hermione
1P/Halley
Halley's Comet, 1910.JPG
 5.5[111] 0.03[112] Comet (75.3 year period)
S/2001 (107) 1
Camilla I		 5.5[110] 1.5 Asteroid moon of 107 Camilla
S/2012 (134340) 1
Pluto V		 5–12.5 Satellite of Pluto
Mab
Uranus XXVI (26)		 5.0[113] Satellite of Uranus
Erriapus
Saturn XXVIII (28)		 5.0 Satellite of Saturn
26858 Misterrogers 4.75 Asteroid
Callirrhoe
Jupiter XVII (17)		 4.3 Satellite of Jupiter
Themisto
Jupiter XVIII (18)		 4.0 0.69 Satellite of Jupiter
Daphnis
Saturn XXXV (35)
Daphnis raw 2010 cropped.jpg
 3.9 [114] 0.084[103] Satellite of Saturn
Remus
Sylvia II		 3.5 0.2 Asteroid moon of 87 Sylvia
S/2003 (379) 1
Huenna I		 3.5 Asteroid moon of 379 Huenna
Tarqeq
Saturn LII (52)		 3.5 Satellite of Saturn
Kari
Saturn XLV (45)		 3.5 Satellite of Saturn
Mundilfari
Saturn XXV (25)		 3.5 Satellite of Saturn
Suttungr
Saturn XXIII (23)		 3.5 Satellite of Saturn
Praxidike
Jupiter XXVII (27)		 3.4 Satellite of Jupiter
Narvi
Saturn XXXI (31)		 3.3 Satellite of Saturn
Skathi
Saturn XXVII (27)		 3.2 Satellite of Saturn
9P/Tempel
PIA02127.jpg
 3[115][116] 0.075 Comet
Hyrrokkin
Saturn XLIV (44)		 3.0[3] Satellite of Saturn
Greip
Saturn LI (51)		 3 Satellite of Saturn
Jarnsaxa
Saturn L (50)		 3 Satellite of Saturn
Skoll
Saturn XLVII (47)		 3 Satellite of Saturn
Surtur
Saturn XLVIII (48)		 3 Satellite of Saturn
S/2003 (130) 1
Elektra I		 3 0.4 Asteroid moon of 130 Elektra
Loge
Saturn XLVI (46)		 3 Satellite of Saturn
Hati
Saturn XLIII (43)		 3 Satellite of Saturn
Fornjot
Saturn XLII (42)		 3 Satellite of Saturn
Bebhionn
Saturn XXXVII (37)		 3 Satellite of Saturn
Aegir
Saturn XXXVI (36)		 3 Satellite of Saturn
S/2004 (45) 1
Eugenia II		 3 Asteroid moon of 45 Eugenia
S/2007 S 2 3 Satellite of Saturn
118401 LINEAR 3 0.23 Main-belt comet
Bergelmir
Saturn XXXVIII (38)		 3[3] Satellite of Saturn
Thrymr
Saturn XXX (30)		 Thrym from Cassini on April 05,2009.jpg 2.8[117] Satellite of Saturn
4179 Toutatis
Toutatis.jpg
 2.7[118] 0.05 Near-Earth asteroid
Megaclite
Jupiter XIX (19)		 2.7[3]
–2.25[119]		 Satellite of Jupiter
2867 Šteins
Steins.png
 2.65[120] Asteroid—E-type
Iocaste
Jupiter XXIV (24)		 2.6 Satellite of Jupiter
Kalyke
Jupiter XXIII (23)		 2.6 Satellite of Jupiter—Carme group
3200 Phaethon 2.55 .14 Asteroid—Apollo—B-type
Farbauti
Saturn XL (40)		 2.5 Satellite of Saturn
3753 Cruithne 2.5 .13 Asteroid & quasi-satellite of Earth
5535 Annefrank
Asteroid 5535 Annefrank.jpg
 2.4 Asteroid
19P/Borrelly
Comet Borrelly Nucleus.jpg
 2.4[121] Comet (6.85 year period) (Jupiter family)
2P/Encke
Comet Encke.jpg
 2.4[122] Comet (3.3 year period)
Taygete
Jupiter XX (20)		 2.2 Satellite of Jupiter—Carme group
Harpalyke
Jupiter XXII (22)		 2.2 Satellite of Jupiter
C/1996 B2
Comet Hyakutake
Hyakutake Hubble.gif
 2.1[123] Comet[124]
81P/Wild
Wild 2
Wild2 3.jpg
 2[125] Comet
Fenrir
Saturn XLI (41)		 2 Satellite of Saturn
Pallene
Saturn XXXIII (33)
N00163156.jpg
 2 0.043 Satellite of Saturn
Eukelade
Jupiter XLVII (47)		 2 Satellite of Jupiter
Helike
Jupiter XLV (45)		 2 Satellite of Jupiter
Aoede
Jupiter XLI (41)		 2 Satellite of Jupiter
Hermippe
Jupiter XXX (30)		 2 Satellite of Jupiter
Thyone
Jupiter XXIX (29)		 2 Satellite of Jupiter
Autonoe
Jupiter XXVIII (28)		 2 Satellite of Jupiter
Isonoe
Jupiter XXVI (26)		 1.9 Satellite of Jupiter—Carme group
Chaldene
Jupiter XXI (21)		 1.9 Satellite of Jupiter—Carme group
(53319) 1999 JM8
Asteroid 1999 JM8.gif
 1.75 Asteroid
Polydeuces
Saturn XXXIV (34)
Dione C
Polydeuces.jpg
 1.75[126] 0.03 Satellite of Saturn — Dione trojan
17P/Holmes
17pHolmes 071104 eder vga.jpg
 1.7[127] Comet
Erinome
Jupiter XXV (25)		 1.6 Satellite of Jupiter—Carme group
Methone
Saturn XXXII (32)
Methone PIA14633.jpg
 1.6[3] 0.019 Satellite of Saturn
Arche
Jupiter XLIII (43)		 1.5 Satellite of Jupiter
Hegemone
Jupiter XXXIX (39)		 1.5 Satellite of Jupiter
Euanthe
Jupiter XXXIII (33)		 1.5 Satellite of Jupiter
Eurydome
Jupiter XXXII (32)		 1.5 Satellite of Jupiter
Carpo
Jupiter XLVI (46)		 1.5 0.45 Satellite of Jupiter
Aitne
Jupiter XXXI (31)		 1.5 Satellite of Jupiter
4055 Magellan
CCD image of asteroid 4055 Magellan.png
 1.245[128] Asteroid—Amor—V-type
9969 Braille
PIA01345.jpg
 1.28 Asteroid
132524 APL
Asteroid 2002 JF56.jpg
 1.15 Asteroid
(6178) 1986 DA 1.15[129] 0.002 Asteroid—Amor—M-type
Anthe
Saturn XLIX (49)		 1 Satellite of Saturn
Kore
Jupiter XLIX (49)		 1 Satellite of Jupiter
Cyllene
Jupiter XLVIII (48)		 1 Satellite of Jupiter
Kallichore
Jupiter XLIV (44)[note 2]		 1 Satellite of Jupiter
Mneme
Jupiter XL (40)		 1 Satellite of Jupiter
Pasithee
Jupiter XXXVIII (38)		 1 Satellite of Jupiter
Kale
Jupiter XXXVII (37)		 1 .015 Satellite of Jupiter
Sponde
Jupiter XXXVI (36)		 1 Satellite of Jupiter
Orthosie
Jupiter XXXV (35)		 1 Satellite of Jupiter
Herse
Jupiter L (50)		 1 Satellite of Jupiter
Thelxinoe
Jupiter XLII (42)[note 2]		 1 Satellite of Jupiter
Euporie
Jupiter XXXIV (34)		 1[3] 0.015 Satellite of Jupiter

Examples of objects below 1 km (1000 m) in radius [edit]

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,[130] 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 viewed by large telescopes. 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).

Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Body Image Mean
radius
(m)		 Mass
×1012 kg
 Type of object
1620 Geographos
Geographos.jpg
 885[35] 4 Near-Earth asteroid—Apollo
1862 Apollo 850 5.1 Near-Earth asteroid—Apollo—Q-type
(214869) 2007 PA8 ≈800[131] Near-Earth asteroid—Apollo
100000 Astronautica ≈800[132] Inner Main-belt Asteroid[133]
Dactyl
Ida I		 Dactyl-HiRes.jpg 700 Asteroid moon of 243 Ida
1566 Icarus 700 2.9 Near-Earth asteroid—Apollo—U-type
4769 Castalia 700[134] 1.3[135] Near-Earth asteroid—Apollo
(137108) 1999 AN10 650 Near-Earth asteroid—Apollo
(29075) 1950 DA
1950da color 150.jpg
 600 3[note 3] Near-Earth asteroid—Apollo
(66391) 1999 KW4
1999 KW4 animated.gif
 600 2.33 Mercury-crosser asteroid—Aten
46P/Wirtanen 600 Comet
103P/Hartley
Hartley 2		 495296main epoxi-1-full full.jpg 570

[136]

 0.3[136] Comet (6.46-year period)
3908 Nyx 520 5 Near-Earth asteroid—Amor—V-type
S/2003 J 9 500[3] Satellite of Jupiter—Carme group
S/2003 J 12 500[3] Satellite of Jupiter
14827 Hypnos 450[137] Comet (dormant)[138]
2007 CA19 432 1.2 Near-Earth asteroid—Apollo
2062 Aten 450 0.76[139] Near-Earth asteroid—Aten
6489 Golevka 350[140] Near-Earth asteroid—Apollo
25143 Itokawa 346 0.0358 Near-Earth asteroid—Apollo
2004 XP14 300 Near-Earth asteroid—Apollo
(144898) 2004 VD17 290 3[141] Near-Earth asteroid—Apollo
Aegaeon
Saturn LIII (53)
Aegaeon (2008 S1).jpg
 250 Satellite of Saturn
4660 Nereus
Nereus.jpg
 165[142] Near-Earth asteroid—Apollo
99942 Apophis 2004MN4 Sormano.gif 162.5[143] 0.05[141] Near-Earth asteroid—Aten—PHO
2005 YU55 [144]
2005YU55-20111107.jpg
 155-170[145] Near-Earth asteroid—Apollo—PHO[146]
S/2009 S 1
PIA11665 moonlet in B Ring cropped.jpg
 150 Satellite of Saturn
2010 TK7 150 Earth trojan—Apollo
2007 TU24
2007 TU24 radar image 20080128.jpg
 125[147] Near-Earth asteroid—Apollo—PHO
2002 JE9 100 NEA—Apollo—PHO
2010 XC15 100 NEA—Apollo—PHO
1994 WR12 65[148] 0.002[141] Near-Earth asteroid—Aten
2009 FD 65[149] 0.0028[149] Near-Earth asteroid—Apollo
2008 HJ [ 18 [150] 0.000005 [150] Near-Earth asteroid & fast rotator (42 s)[150]
1998 KY26 Asteroid 1998 KY26.faces model.jpg 15[151] Near-Earth asteroid & fast rotator (10 m)

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

For more about really small objects in the Solar System see meteoroid, micrometeoroid, and interplanetary dust cloud.

Surface gravity [edit]

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}

Closely imaged objects [edit]

Solar System
TheSun.png
Jupiter on 2010-06-07 (captured by the Hubble Space Telescope).jpg
Saturn closeup.jpg
Uranus2.jpg
Neptune.jpg
The Earth seen from Apollo 17.jpg
 Venus-real.jpg
Sun
(star)		 Jupiter
(planet)		 Saturn
(planet)		 Uranus
(planet)		 Neptune
(planet)		 Earth
(planet)		 Venus
(planet)
Kammars.jpg
Ganymede g1 true 2.jpg
Two Halves of Titan.png
Mercury in color - Prockter07-edit1.jpg
Callisto.jpg
Io highest resolution true color.jpg
FullMoon2010.jpg
Mars
(planet)		 Ganymede
(moon of Jupiter)		 Titan
(moon of Saturn)		 Mercury
(planet)		 Callisto
(moon of Jupiter)		 Io
(moon of Jupiter)		 Moon
(moon of Earth)
Europa-moon.jpg
Triton Voyager 2.jpg
Titania (moon) color cropped.jpg
PIA07763 Rhea full globe5.jpg
Voyager 2 picture of Oberon.jpg
Iapetus as seen by the Cassini probe - 20071008.jpg
PIA00040 Umbrielx2.47.jpg
Europa
(moon of Jupiter)		 Triton
(moon of Neptune)		 Titania
(moon of Uranus)		 Rhea
(moon of Saturn)		 Oberon
(moon of Uranus)		 Iapetus
(moon of Saturn)		 Umbriel
(moon of Uranus)
Ariel-NASA.jpg
Dione (Mond) (30823363).jpg
Inset-sat tethys-large.jpg
Vesta full mosaic.jpg
Enceladus from Voyager.jpg
Miranda.jpg
Proteus Voyager 2 croped.jpg
Ariel
(moon of Uranus)		 Dione
(moon of Saturn)		 Tethys
(moon of Saturn)		 Vesta
(asteroid)		 Enceladus
(moon of Saturn)		 Miranda
(moon of Uranus)		 Proteus
(moon of Neptune)
Mimas PIA12569.jpg
Hyperion in natural colours.jpg
Phoebe cassini.jpg
PIA12714 Janus crop.jpg
Amalthea (moon).gif
PIA09813 Epimetheus S. polar region.jpg
Thebe.jpg
Mimas
(moon of Saturn)		 Hyperion
(moon of Saturn)		 Phoebe
(moon of Saturn)		 Janus
(moon of Saturn)		 Amalthea
(moon of Jupiter)		 Epimetheus
(moon of Saturn)		 Thebe
(moon of Jupiter)
Prometheus 12-26-09a.jpg
Flying By Pandora.jpg
(253) mathilde crop.jpg
Leading hemisphere of Helene - 20110618.jpg
243 Ida large.jpg
Atlas (NASA).jpg
Telesto cassini closeup.jpg
Prometheus
(moon of Saturn)		 Pandora
(moon of Saturn)		 Mathilde
(asteroid)		 Helene
(moon of Saturn)		 Ida
(asteroid)		 Atlas
(moon of Saturn)		 Telesto
(moon of Saturn)
N00151485 Calypso crop.jpg
Phobos colour 2008.jpg
Deimos-MRO.jpg
951 Gaspra.jpg
PIA02127.jpg
Comet Borrelly Nucleus.jpg
Wild2 3.jpg
Calypso
(moon of Saturn)		 Phobos
(moon of Mars)		 Deimos
(moon of Mars)		 Gaspra
(asteroid)		 Tempel 1
(comet)		 Borrelly
(comet)		 Wild 2
(comet)
Methone PIA14633.jpg
NASAHartley2Comet.jpg
Methone
(moon of Saturn)		 Hartley 2
(comet)
This box:

Notes [edit]

† 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 where the 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.
A Assumed mass
P Mass calculated assuming Pluto's density of 2.0 g/cm3
Note: For many of the well-determined moons, radii were taken from the JPL Solar System Dynamics page.
O Radius has been determined with Asteroid occultation
  1. ^ a b Densities of those KBOs whose masses are uncertain are assumed to be 2.0 in line with Pluto
  2. ^ a b Roman Numerals
  3. ^ 3000 x 10^9 kg

References [edit]

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Further reading [edit]

External links [edit]
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