List of Solar System objects by size
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, many of the larger small Solar System bodies (such as dwarf planets and 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 equilibrium oblate spheroid 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.

Contents

List

Objects above ≈300 km in radius

Anything above this size is probably in "hydrostatic equilibrium", but some bodies near the end of this list may not. However, their predicted or measured size would need to be "grossly in error" or their composition primarily rocky, for them not to be.[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[6]
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 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 regular
Uranus Uranus2.jpg 25,362 3.98 68,340 63.1 86,832 14.536 1.30 8.87 0.90 Planet regular
Neptune Neptune.jpg 24,622 3.86 62,540 57.7 102,430 17.147 1.76 11.15 1.140 Planet 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 1 Planet 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 0.91 Planet 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 regular
Ganymede
Jupiter III
Ganymede g1 true 2.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[7]
(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 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 Full Moon Luc Viatour.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[8] 0.182 7 0.007 16.7[9] 0.0027 2.25 0.662 0.0677 Dwarf planet — SDO — binary regular
PlutoR
134340
Pluto-map-hs-2010-06-c180.jpg 1,161[10]
(w/o gas)
0.181 7.15 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[11] 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
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
MakemakeRA
136472
Makemake hubble.png 710[13] 0.126
–0.157
1.8 0.002 3 0.00067 2.0 0.4 0.04 Dwarf planet —
KBO
regular
Charon
Pluto I
603.5[14] 0.095 0.87 0.0008 1.52 0.00025 1.65 0.279 0.028 Satellite of Pluto regular
SednaRA
90377
Sedna PRC2004-14d.jpg 600–800[15] 0.09
–0.14
1.73 0.0016 3 0.00050 2.0 0.33
–0.50
0.0337
–0.0511
Detached object unknown
2007 OR10
225088
"Snow White"
1880-CT MBrown SPOTLIGHT medium.jpg ≈600[16]–710[5] 0.094 0.904 0.0008 1.81P 0.0003 2.0P 0.168 0.017 SDO unknown
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
HaumeaR
136108
2003 EL61.jpg 575[17]–750[5] 0.117 1.3–1.6 0.001 4.006 0.00069 2.551[18] 0.44 0.045 Dwarf planet —
KBO — trinary
regular (scalene ellipsoid)
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
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
Ceres
1
Ceres optimized.jpg 475 0.076 0.437 0.0004 0.95 0.000159 2.08 0.27 0.0275 Dwarf planet — Asteroid regular
Quaoar
50000
Quaoar PRC2002-17e.jpg 445[19] 0.07 0.37 0.0003 1.6[19] 0.0003 4.2[19] 0.125 0.013 KBO — Cubewano — binary unknown
OrcusRA
90482
Orcus nasa.jpg 425[13] 0.069
–0.08
0.4 0.0004 0.63A 0.0001 1.5 0.234 0.023 KBO — Plutino — binary unknown
2002 TC302R
84522
410–570[20] 0.09 0.786 0.0007 1.573P 0.00026 2.0 0.321 0.033 KBO2:5 resonance unknown
2007 UK1269
229762
MinorPlanet-2007uk126-19970930.gif 375[5] 0.069 0.354 0.0003 0.708P 0.0001 2.0 0.246 0.025 SDO unknown
2005 UQ5139
202421
375[5] 0.074 0.443 0.0004 0.886P 0.0001 2.0 0.278 0.0284 KBO — Cubewano unknown
2003 MW129
174567
375[5] 0.0658 0.308 0.0003 0.616P 0.0001 2.0 0.228 0.02 KBO unknown
2002 AW197R
55565
2002AW197-Spitzer.jpg 370[5] 0.0576 0.207 0.00019 0.414P 0.000069 2.0 0.206 0.0211 KBO[21] unknown
2005 QU1829
303775
365[5] 0.082 0.606 0.00056 1.21P 0.0002 2.0 0.294 0.03 SDO[22] unknown
2002 MS4 360[5]R 0.057 0.203 0.00018 0.4005P 0.000067 2.0P 0.204 0.02086 KBO[21] unknown
2007 JJ43
278361
350[5] TNO[21] unknown
2003 AZ84R
208996
345[5] 0.0538 0.169 0.000156 0.53P 5.66 E-5 2.0P 0.172 0.02 KBO — Plutino — binary unknown
2010 EK139 340[5] SDO unknown
2002 UX25R
55637
UX25-LB1-2009Nov19-06UT.jpg 340[5] 0.0535 0.166 0.000153 0.331P 0.0000554 2.0 0.191 0.01952 KBO — binary unknown
2004 GV9R
90568
340[5] 0.0531 0.162 0.00015 0.325P 0.0000534 2.0 0.19 0.0194 KBO unknown
2006 QH1819 340[5] 0.06 0.233 0.000215 0.467P 0.00008 2.0 0.214 0.022 SDO unknown
2005 RN439
145452
330[5] 0.0573 0.2036 0.00019 0.407P 0.000068 2.0 0.205 0.02096 KBO[21] unknown
2010 KZ39 330[5] Detached object[23] or Cubewano[24] unknown
IxionRA
28978
Ixion-Spitzer2007.gif 325[5] 0.051 0.144 0.000133 0.3 5.0E-5 2.086 0.19 0.021 KBO unknown
2004 XA192
230965
320[5] 0.055 0.177 0.00016 0.354P 0.000059 2.0 0.195 0.02 TNO[21] unknown
2003 VS2
84922
2003VS2-mag20.jpg 315[5] 0.057 0.203 0.00018 0.4005P 0.000067 2.0 0.204 0.02086 KBO — Plutino[21] unknown
2001 UR1639
42301
305[5] 0.05 0.134 0.00012 0.269P 0.000045 2.0P 0.178 0.018 SDO[21] unknown
Salacia
120347
305[5] 0.0455 0.102 0.00009 0.2P 0.000034 2.0P 0.159 0.016 KBO — binary unknown
2010 RE64 305[5] KBO unknown
SDO unknown
KBO — Plutino unknown
2003 UZ4139 300[5] 0.048 0.116 0.00012 0.33P 0.000055 2.0P 0.241 0.0246 KBO — Plutino unknown
2008 ST291 300[5] SDO unknown
KBO — Cubewano unknown

Selected objects between ≈300 and ≈200 km in radius

Satellites in this size range tend to be round (although Proteus is not), and TNOs are expected to be as well, assuming the estimated size is correct. The asteroid 10 Hygiea is not, and 2 Pallas and 4 Vesta are borderline.

Body Image Mean radius
(km)
Mean radius
(R)
Volume
(109 km3)
Volume
(V)
Mass
×1021 kg
(Yg)
Mass
(M)
Density[25]
g/cm3
Surface gravity
(m/s2)
Surface gravity
(⊕)
Type of object Shape
Varuna*
20000
Varuna artistic.png 250[5] 0.049 0.125 0.000115 0.37 6.2E-5 0.992[18] 0.258 0.028 KBO unknown
2005 RM439
145451
290[26] 0.0455 0.102 0.00009 0.2P 0.000034 2.0P 0.159 0.016 KBO unknown
2004 NT33 290[21] 0.043 0.089 0.000082 0.178P 0.000029 2.0P 0.155 0.0158 KBO — Cubewano[21] unknown
1996 TL66RA
15874
287.5 0.045 0.1 9.2E-5 0.2 3.3E-5 2.009 0.162 0.018[5] SDO unknown
2004 UX10
144897
284.5[5] 0.039 0.065 0.00006 0.13P 0.000022 2.0P 0.139 0.014 KBO unknown
2004 XR190
"Buffy"
277[21]* 0.059 0.221 0.0002 0.4416P 0.00007 2.0P 0.21 0.0215 SDO[21] unknown
2004 TY364*
120348
277[21] 0.043 0.089 0.000082 0.178P 0.000029 2.0P 0.155 0.0158 KBO[21] unknown
HuyaR
38628
266[20] 0.04175 0.0788 0.000073 0.158P 0.00026 2.0P 0.15 0.015 KBO — Plutino unknown
Pallas$
2
PallasHST2007.jpg 266[27] 0.042 0.078 0.00007 0.211 0.0000353 2.8[28] 0.2 0.02 Asteroid uncertain
Vesta$
4
Dawn-image-070911.jpg 264.6 0.042 0.078 0.00007 0.262 0.0000438 3.42[29] 0.251 0.0256 Asteroid regular?
KBO unknown
2003 QX113 252.5[21] 0.036 0.051 0.00005 0.102P 0.000017 2.0P 0.129 0.013 SDO[21] 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
2006 HH123 239[5] 0.031 0.0335 0.000011 0.067P 0.000011 2.0 0.112 0.011 Centaur[21] 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
1999 DE9
26375
230.5[20] 0.036 0.051 0.000047 0.1026P 0.000017 2.0 0.129 0.013 KBO unknown
Chaos*
19521
230–372.5[22] 0.0585 0.216 0.0002 0.4328P 0.00007 2.0P 0.209 0.021 KBO — Cubewano unknown
1998 SN165*
35671
230[26] 0.036 0.05 0.000046 0.1P 0.000017 2.0 0.128 0.013 KBO unknown
2002 XV93 220[21] 0.036 0.051 0.00005 0.102P 0.000017 2.0 0.129 0.013 Plutino[21] unknown
2003 FY128*
120132
220[21] 0.0345 0.0446 0.00004 0.089P 0.000014 2.0 0.123 0.0126 SDO[21] unknown
2000 YW134*
82075
215.5[21] 0.039 0.065 0.00006 0.13P 0.000022 2.0P 0.139 0.014 SDO[21] unknown
1999 CD158 210[21] 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 210[21]* 0.04 0.067 0.00006 0.134P 0.000022 2.0 0.141 0.014 Plutino[21] 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
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[21] 0.031 0.0335 0.000011 0.067P 0.000011 2.0 0.112 0.011 SDO[21] unknown
Mimas
Saturn I
Mimas moon.jpg 198.3 0.031 0.033 0.00003 0.03749 0.0000063 1.15 0.06363 0.00648 Satellite of Saturn regular

Selected objects between 200 and 100 km in radius

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, with existing instruments, to directly measure their sizes. Values relative to Earth are not included beyond this point. Mass switches from 1021 kg to 1018 kg (Zg), with Mimas double listed as example of unit shift. 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.[34]

Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Body Image Mean radius
(km)
Mass
×1018 kg
(Zg)
Type of object Shape
Mimas
Saturn I
Mimas moon.jpg 198.3 37.49 Satellite of Saturn regular
2003 QW90 191.5[22] 89P Kuiper belt object unknown
KBO unknown
(15789) 1993 SC 181.5[22] Trans-Neptunian object — plutino[22] unknown
(145480) 2005 TB190 186.25 [35] Detached object unknown
(48639) 1995 TL8* 175 Kuiper belt object — binary unknown
Nereid A
Neptune II
Nereid-Voyager2.jpg
170 31 Satellite of Neptune irregular
148780 Altjira 9 170[22] Trans-Neptunian object — cubewano unknown
Trans-Neptunian object — plutino unknown
704 Interamnia M 158.31[36] 37 Main-belt asteroid — F-type unknown
Hiʻiaka
Haumea I
155 20 Satellite of Haumea unknown
1995 SN55* (lost) 155 Centaur unknown
(79360) 1997 CS299 152.5[22] Kuiper belt object — binary unknown
(79978) 1999 CC1589 152[22] Scattered-disc object unknown
(40314) 1999 KR169 152 Trans-Neptunian object unknown
52 Europa$
52Eur-LB1-richfield.jpg
150.4 16.5 Main-belt asteroid — C-type irregular[37]
511 Davida$ 144.7 43.8 Main-belt asteroid — C-type irregular
(55636) 2002 TX300 TX300-2009Nov16-04UT.jpg 143[38] 12 Kuiper belt object—Haumea family unknown
(47171) 1999 TC36(A1) 143[39] Kuiper belt object — Trinary (A1+A2+B) unknown
87 Sylvia$
CMSylvia.png
142.8 14.78 Outer main-belt asteroid — X-type — trinary irregular[37]
Vanth
Orcus I
140–190 Satellite of Orcus unknown
(26308) 1998 SM165 139.9[20] 14 Kuiper belt object — binary unknown
65 Cybele$ 136.5[40] 2004
118.7[41] IRAS
17.8 Outer main-belt asteroid — C-type irregular
Hyperion
Saturn VII
Hyperion true.jpg
135[3] 5.58 Satellite of Saturn irregular
(47171) 1999 TC36(A2) 132.5[39] Kuiper belt object — Trinary (A1+A2+B) unknown
2005 PU219 132.5[22] Scattered-disc object unknown
(79983) 1999 DF99 132.5 Trans-Neptunian object — cubewano unknown
107 Camilla$ 129.4 11.2 Outer main-belt asteroid — C-type — binary irregular[42]
10199 Chariklo 129.3 [20] Centaur unknown
31 EuphrosyneM 128 6.23 Main-belt asteroid — C-type unknown
15 Eunomia$ 127.7[43] 31.2 Main-belt asteroid — S-type irregular[37]
(148209) 2000 CR105*A 126.5[44] 13 Detached object unknown
(145453) 2005 RR43 126
348.4[44]
Kuiper belt object—Haumea family unknown
(119878) 2002 CY224 121[22] 15 Scattered disc object unknown
3 Juno $
Juno.JPG
116.96[36] 26.7 Main-belt asteroid — S-type irregular[37]
2060 Chiron*A
95P/Chiron
116.7 10 Centaur unknown
88 Thisbe $ 116[45] 10.5 M Main-belt asteroid — B-type irregular[42]
(120178) 2003 OP32 115 Kuiper belt object — Haumea family unknown
2004 VN1129 115 Scattered-disc object unknown
Kuiper belt object unknown
324 BambergaM 114 10 Main-belt asteroid — C-type unknown
451 Patientia 112.5 Main-belt asteroid unknown
19 Fortuna $ 112.5[47] 12.7 Main-belt asteroid — G-type unknown
532 Herculina 111 Main-belt asteroid — S-type irregular[37]
48 Doris 110.9[48] 17A Main-belt asteroid irregular
375 Ursula
375Ursula-LB1.jpg
108 [49] Main-belt asteroid unknown
45 EugeniaM
45 eugenia-01.jpg
107 5.69 Main-belt asteroid — F-type — trinary irregular[37]
Phoebe $
Saturn IX
Phoebe cassini.jpg
106.6 8.29 Satellite of Saturn irregular
29 Amphitrite$ 106 11.8 Main-belt asteroid — S-type irregular[37]
53311 Deucalion 105.5[22] Trans-Neptunian object — cubewano unknown
(33001) 1997 CU29 105.5 Trans-Neptunian object — cubewano unknown
423 DiotimaA 104.385[36] 16 Main-belt asteroid — C-type irregular[50]
(181902) 1999 RD215 104.33[22] Scattered disc object unknown
13 EgeriaM 103.82[36] 16.3 Main-belt asteroid — G-type unknown
54598 Bienor 103.5[51] Centaur unknown
94 Aurora 102.5 Main-belt asteroid irregular[52]
624 HektorA
624Hektor-LB1-mag15.jpg
101.5[53] 14 Asteroid — Jupiter Trojan — binary irregular
38083 Rhadamanthus 100.5[22] Kuiper belt object unknown
(19308) 1996 TO66 100 Kuiper belt object — Haumea family unknown

Selected objects between 100 and 50 km in radius

Objects 100 and 50 km in radius (200 km to 100 km in average diameter). This currently includes most objects in the asteroid belt and moons of the gas giants in this size range, but is missing many newly discovered objects in the outer Solar System such as here.[34] Asteroid spectral types are mostly Tholen, but some might be SMASS.

Body Image Mean radius
(km)
Mass
×1018 kg
(Zg)
Type of object
7 Iris$
7Iris-LB1-richfield-mag10.jpg
99.915 [54] 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[36] 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[22] Kuiper belt object — cubewano
121 HermioneM 95 5.38 Outer main-belt asteroid — C-type — binary
Actaea
Salacia I
95 Satellite of 120347 Salacia
372 Palma 94.31[55] 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[36] 12.8 Main-belt asteroid — S-type
5145 Pholus 92.5[56] 6.6 Centaur
154 Bertha 92.47[36] 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[36] 6.6 Asteroid — G-type — binary
(119951) 2002 KX14 90[21] Trans-Neptunian object[21]
Janus$
Saturn X (10)
PIA12714 Janus crop.jpg
89.4 1.912 Satellite of Saturn
259 Aletheia 89.3[36] 5.97 Main-belt asteroid
Galatea
Neptune VI (6)
Galatea moon.jpg
88[3] 2.12 Satellite of Neptune
88611 Teharonhiawako 88[22] Trans-Neptunian object — cubewano — binary
42355 Typhon 87.5[20] Trans-Neptunian object — binary
(19255) 1994 VK8 87.5[22] 5.6 Trans-Neptunian object — cubewano
120 Lachesis 87.05[36] 5.5 Main-belt asteroid
65489 Ceto 87[57] 5.4[57] 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[36] Asteroid
153 Hilda 85.32[36] 5.2 Main-belt asteroid — Hildas
790 Pretoria 85.2[58] Outer main-belt asteroid — Cybele
Himalia M
Jupiter VI (6)
Himalia.jpg
85[3]–92[59] 4.19 [60] 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[36] 5.05 Main-belt asteroid — C-type
194 Prokne 84.21[36] 5 Main-belt asteroid — C-type
566 Stereoskopia[61] 84.08[36] Outer main-belt asteroid — Cybele
Amalthea
Jupiter V (5)
Amalthea (moon).gif
83.5[62] 2.08[63] Satellite of Jupiter$
911 Agamemnon 83.3[36] Asteroid — Jupiter Trojan
22 Kalliope
22-Kalliope-Linus.jpg
83.1[64] 8.09M Main-belt asteroid — M-type — binary
66652 Borasisi 83[22] Trans-Neptunian object — cubewano — binary
54 Alexandra 82.88 Main-belt asteroid
386 Siegena 82.5[65] Main-belt asteroid — C-type
59 Elpis 82.4 Main-belt asteroid
1437 Diomedes 82.16[36] 4.6 Asteroid — Jupiter Trojan
444 GyptisM 81.54[36] 12.5 Main-belt asteroid — C-type
Puck
Uranus XV [15]
Puck.png
81[3] 2.9A Satellite of Uranus
409 Aspasia 80.81[36] 4.42 Main-belt asteroid — C-type
20461 Dioretsa 80.2[22] Centaur[66] — Damocloid
1992 QB1 80[22] Kuiper belt object — cubewano
(15875) 1996 TP66 80[20] Kuiper belt object — inner plutino
209 Dido 79.97[36] 4.28 Main-belt asteroid — C-type
334 Chicago 79.275[36] Main-belt asteroid — C-type
804 Hispania 78.79[36] 9.95 Main-belt asteroid — P-type
185 Eunike 78.76[36] 4.09 Main-belt asteroid
139 Juewa 78.3[36] 4 Main-belt asteroid
354 Eleonora 77.585[36] Main-belt asteroid — S-type
85 Io 77.4[67] 3.4 Main-belt asteroid
165 Loreley 77.39[36] 3.91 Main-belt asteroid — C-type
173 Ino 77.05[36] 3.83 Main-belt asteroid — C-type
11 Parthenope 76.67[36] 6.15M Main-belt asteroid
(137295) 1999 RB216 76.5[22] Kuiper belt object — twotino
14 Irene 76[68] 8.2 Main-belt asteroid
89 Julia 75.75 3.6 Main-belt asteroid — S-type
536 Merapi 75.7[36] Main-belt asteroid
(145474) 2005 SA278 75.62[22] Scattered-disc object
776 Berbericia 75.59[36] Main-belt asteroid
145 Adeona 75.57[36] 3.6 Main-belt asteroid — Adena
150 Nuwa 75.565[36] 3.62 Main-belt asteroid — C-type
Dysnomia
Eris I
75[69] Satellite of Eris
DespinaA
Neptune V
Despina.jpg
75 2.1 Satellite of Neptune
Sycorax
Uranus XVII
75[3] 2.3 Satellite of Uranus
49 Pales M 74.9[36] 2.69 Main-belt asteroid — C-type
39 Laetitia 74.75 3.5 Asteroid
117 Lomia 74.36[36] 3.4 Main-belt asteroid — C-type
238 Hypatia 74.245[36] Main-belt asteroid — C-type
168 Sibylla 74.195[36] 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[22] Trans-Neptunian object
137 Meliboea 72.71[36] 3.2 Main-belt asteroid
20 Massalia$ 72.5 5.67 Asteroid
211 Isolda 71.6[36] 3.07 Main-belt asteroid — C-type
1172 Äneas 71.41[70] Asteroid — Jupiter Trojan
144 Vibilia 71.19[36] 3 Main-belt asteroid
508 Princetonia 71.18[36][71] Main-belt asteroid
895 Helio 70.95 [36] Main-belt asteroid — B-type
361 Bononia 70.86 [36] Main-belt asteroid — D-type
420 Bertholda 70.625 [36] Main-belt asteroid — P-type
93 Minerva 70.5 2.9 Main-belt asteroid — C-type — trinary
617 Patroclus 70.46 [36] Asteroid — Jupiter Trojan — binary
308 Polyxo 70.345[36] 2.92 Main-belt asteroid — T-type
18 Melpomene 70.3 3 Main-belt asteroid
268 Adorea 69.945[36] 2.87 Main-belt asteroid
349 Dembowska 69.885[36] Main-belt asteroid — R-type
489 Comacina 69.695 [36] Main-belt asteroid
(47171) 1999 TC36(B) 69.5[39] Kuiper belt object — Trinary (A1+A2+B)
69 Hesperia 69.07 2.76 Main-belt asteroid — M-type
Kuiper belt object — Haumea family
762 Pulcova
762Pulcova-SwRI.gif
68.54 [36] Main-belt asteroid — C-type — binary
Pabu
Borasisi I
68.5[72] Secondary of 66652 Borasisi
196 Philomela 68.195[36] 2.65 Main-belt asteroid — S-type
212 Medea 68.06[36] 2.64[73] Main-belt asteroid
95 Arethusa 68.02[36] 2.6 Main-belt asteroid
Portia
Uranus XII
67.6[3] 1.7 Satellite of Uranus
588 Achilles 67.735 [36] Asteroid — Jupiter Trojan
690 Wratislavia
690Wrat-mag13-100yrs.jpg
67.325 [36] Asteroid
111 Ate 67.28 Main-belt asteroid — C-type
247 Eukrate 67.215[36] Main-belt asteroid — C-type
705 Erminia 67.11[36] Main-belt asteroid
471 Papagena 67.095 [36] Main-belt asteroid — C-type
Phorcys
Ceto I
67[22] 1.67[57] Satellite of 65489 Ceto
1998 WW31 66.5 2 Trans-Neptunian object — binary
147 Protogeneia 66.465[36] 2.5 Main-belt asteroid
Menoetius
Patroclus I
66.3 Secondary of 617 Patroclus
344 Desiderata 66.135[36] 2.42 Main-belt asteroid — C-type
146 Lucina 66.1[36] 2.4 Main-belt asteroid
141 Lumen 65.52[36] 1.6 Main-belt asteroid — C-type
356 Liguria 65.655 [36] Main-belt asteroid
187 Lamberta 65.2 [36] 2.37 Main-belt asteroid — C-type
419 Aurelia 64.505 [36] Main-belt asteroid — F-type
200 Dynamene 64.18[36] Main-belt asteroid
8 Flora 63.9 8.47 Main-belt asteroid — S-type — Flora
712 Boliviana 63.785 [36] Main-belt asteroid — X-type
654 Zelinda 63.7 [36] Main-belt asteroid
426 Hippo 63.55 [36] Main-belt asteroid
47 Aglaja pic 63.48 Main-belt asteroid — C-type
279 Thule 63.295[36] Main-belt asteroid — D-type
92 Undina 63.21[74] 2.1 Main-belt asteroid — M-type
1173 Anchises(1930 UB) 63.135[36] Asteroid — Jupiter Trojan
1143 Odysseus 62.82[36] Asteroid — Jupiter Trojan (L4)
469 Argentina 62.785 [36] Main-belt asteroid — Cybele
159 Aemilia 62.5 1.4 Asteroid
405 Thia 62.45 [36] Main-belt asteroid — C-type
602 Marianna 62.36 [36] Main-belt asteroid
46 Hestia 62.07[36] 3.5[75]–21[76] 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 [36] Main-belt asteroid — C-type
134 Sophrosyne 61.64 2 Main-belt asteroid
328 Gudrun 61.46[36] 1.94 Main-belt asteroid — S-type
1867 Deiphobus 61.335[36] 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[77] Main-belt asteroid
276 Adelheid 60.8[36] Main-belt asteroid
176 Iduna 60.52[36] 1.76 Main-belt asteroid — G-type
156 Xanthippe 60.495[36] 1.85 Main-belt asteroid — S-type
28 Bellona 60.45[36] 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 [36] Main-belt asteroid — C-type —
225 Henrietta 60.245[36] 1.83 Main-belt asteroid — C-type — Cybele
618 Elfriede 60.145 [36] Main-belt asteroid — C-type —
(73840) 2002 PN34 59.75[20] Scattered-disc object
105 Artemis 59.6 1.8 Main-belt asteroid — C-type
81 Terpsichore 59.54 Main-belt asteroid — C-type
5 Astraea 59.535[36] 2.9 Main-belt asteroid
74 Galatea 59.36 1.8 Main-belt asteroid — C-type
350 Ornamenta 59.175[36] Main-belt asteroid — C-type
772 Tanete 58.83[36] Main-belt asteroid — C-type
476 Hedwig 58.38 [36] Main-belt asteroid
1093 Freda 58.365 [36] Main-belt asteroid
171 Ophelia 58.35[36] 1.66 Main-belt asteroid — C-type — Themis
909 Ulla 58.22[36] Asteroid
3317 Paris 58.13[36] Asteroid — Jupiter Trojan
203 Pompeja 58.125[36] Main-belt asteroid
3063 Makhaon 58.07[36] 1.6 Asteroid — Jupiter Trojan
38 Leda 57.97[36] 1.6 Asteroid
360 Carlova 57.88[36] Main-belt asteroid —
521 Brixia 57.825 [36] Main-belt asteroid —
490 Veritas 57.775[36] Main-belt asteroid — Veritas
466 Tisiphone 57.765 [36] Main-belt asteroid — C-type
53 Kalypso 57.69 Asteroid
2241 Alcathous 57.315 [36] Asteroid — Jupiter Trojan
388 Charybdis 57.085 [36] 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[78] Satellite of Saturn$
596 Scheila 56.67 [36] Main-belt asteroid
56 Melete 56.62 1.5 Asteroid
129 Antigone 56.5[79] 2 Main-belt asteroid — nickel-iron
12 Victoria 56.4 Main-belt asteroid — S-type
57 Mnemosyne 56.3 Asteroid
545 Messalina 55.645 [36] Asteroid
2797 Teucer 55.57[36] Asteroid — Jupiter Trojan(L4)
2920 Automedon 55.5[36] Asteroid — Jupiter Trojan(L4)
2001 QR322 55 Neptune trojan
91 Aegina 54.9 1.4 Main-belt asteroid — C-type
140 Siwa 54.895 [36] 1.4 Main-belt asteroid
814 Tauris 54.78[36] Main-belt asteroid
595 Polyxena 54.535 [36] Main-belt asteroid
230 Athamantis 54.495 Main-belt asteroid — S-type
659 Nestor 54.435 [36] Asteroid — Jupiter Trojan
37 Fides 54 1.3 Main-belt asteroid — S-type
514 Armida 53.085 [36] Main-belt asteroid
23 Thalia 53.8 1.3 Main-belt asteroid — S-type
739 Mandeville 53.765 [36] Main-belt asteroid — X-type
2007 VL305 A 53.75 Neptune trojan
40 Harmonia 53.6 1.3 Main-belt asteroid — S-type
181 Eucharis 53.33[36] 1.2 Main-belt asteroid — K-type
346 Hermentaria 53.26 [36] Main-belt asteroid — S-type
357 Ninina 53.05 [36] Main-belt asteroid
506 Marion 52.97 [36] Main-belt asteroid — C-type
365 Corduba 52.96 [36] Main-belt asteroid — C-type
36 Atalante 52.8 Asteroid
713 Luscinia 52.76 [36] Main-belt asteroid — C-type
1269 Rollandia 52.595[36] Main-belt asteroid
164 Eva 52.435[36] 1.21 Main-belt asteroid — C-type
98 Ianthe 52.25 1.2 Main-belt asteroid — C-type
240 Vanadis 51.95 [36] Main-belt asteroid — C-type
221 Eos 51.935[36] 1.17 Main-belt asteroid — K-type
(29981) 1999 TD10 51.85[20] Trans-Neptunian object
788 Hohensteina 51.84[36] Main-belt asteroid
791 Ani 51.76[36] Main-belt asteroid
1208 Troilus 51.67[36] Asteroid — Jupiter Trojan
192 Nausikaa 51.63[36] Main-belt asteroid — S-type
63 Ausonia 51.57 1.1 Main-belt asteroid — S-type
35 Leukothea 51.555[36] 1.1 Main-belt asteroid — C-type
570 Kythera 51.405 [36] Main belt asteroid
233 Asterope 51.39 [36] 1.4 Main belt asteroid — T-type
4063 Euforbo 51.23[36] Asteroid — Jupiter Trojan
1583 Antilochus 50.81[36] Asteroid — Jupiter Trojan
1390 Abastumani 50.79[36] Main-belt asteroid
522 Helga 50.61 [36] Main-belt asteroid — Cybele
175 Andromache 50.585[36] 1.08 Main-belt asteroid — C-type
191 Kolga 50.515[36] 1.08 Main-belt asteroid — C-type
663 Gerlinde 50.44 [36] Asteroid
626 Notburga 50.365 [36] Asteroid
387 Aquitania 50.255[36] Main-belt asteroid — S-type
42 Isis 50.1 Main-belt asteroid — S-type
30 Urania 50 Main-belt asteroid — S-type

Examples of objects between 50 km and 20 km in radius

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)

Body Image Mean radius
(km)
Mass
×1015 kg
(Eg)
Type of object
50 VirginiaA 49.91 1000 Asteroid
114 Kassandra 49.86[36] 1000 Main-belt asteroid — T-type
1021 Flammario 49.695[36] Asteroid
162 Laurentia 49.55[36] Main-belt asteroid
401 Ottilia 49.56[36] Main-belt asteroid
ThebeA
Jupiter XIV (14)
Thebe.jpg
49.3[3] 430 Satellite of Jupiter
148 Gallia 48.88[36] 980 Main-belt asteroid — R-type
404 Arsinoe 48.855[36] Main-belt asteroid — C-type
27 EuterpeA 48 930 Main-belt asteroid — S-type
773 Irmintraud 47.94[36] Asteroid — D-type
21 Lutetia
Lutetia closest approach (Rosetta).jpg
47.8[36] 1700 [80] Main-belt asteroid — M-type
62 Erato 47.7 910 Main-belt asteroid — Themis
26 Proserpina 47.4[36] 900 Asteroid
345 Tercidina 47.06[36] 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[36] Main-belt asteroid — C-type
379 Huenna 46.2 480 Main-belt asteroid — C-type
Nix
Pluto II
46[81] 70 Satellite of Pluto
103 Hera 45.6 790 Asteroid
17 Thetis
17Thetis-LB1.jpg
45 1200 Asteroid
143 Adria 44.965[36] 760 Main-belt asteroid
109 Felicitas 44.7 750 Asteroid
100 Hekate 44.5[82] 1000 Asteroid
90 Antiope A
90 Antiope.gif
43.9[83] 410 Asteroid — C-type — binary
227 Philosophia 43.655[36] Main-belt asteroid
Prometheus $
Saturn XVI (16)
Prometheus 12-26-09a.jpg
43.1[84] 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[20][22] Centaur[85]
S/2000 (90) 1
90 Antiope.gif
41.9[83] Asteroid moon of 90 Antiope
71 Niobe 41.7 610 Asteroid
102 Miriam 41.5[86] Asteroid
97 Klotho 41.4 590 Asteroid
61 Danae 41.02 Asteroid
ThalassaA
Neptune IV
41 350 Satellite of Neptune
122 Gerda 40.85[36] 570 Main-belt asteroid — S-type
Pandora$
Saturn XVII (17)
Pandora PIA07632.jpg
40.7[84] 135.6 Satellite of Saturn
83 Beatrix 40.69 560 Main-belt asteroid — X-type
32 PomonaA 40.5 550 Asteroid
BelindaA
Uranus XIV (14)
Belinda.gif
40 360 Satellite of Uranus
115 Thyra 39.92[36] Asteroid
Cressida
Uranus IX
39.8[3] 340A Satellite of Uranus
135 Hertha 39.62[36] Asteroid
84 Klio 39.58[87] 520 Asteroid
80 Sappho 39.2 Asteroid
Echidna
Typhon I
39 Satellite of 42355 Typhon
1001 Gaussia 39 Asteroid
58534 Logos 38.5[88] 270 Kuiper belt object — cubewano — binary
124 Alkeste 38.18[36] 470 Main-belt asteroid — S-type
55576 Amycus 38.15[20] Centaur
25 Phocaea 37.6 Asteroid
Weywot
Quaoar I
37 Satellite of Quaoar
8405 Asbolus 37[89]–42[20] Centaur
112 Iphigenia 36.35[36] Asteroid
(86047) 1999 OY3 36 Kuiper belt object — Haumea family
Hydra
Pluto III
36[3] 391P Satellite of Pluto
Rosalind*
Uranus XIII
36 250 Satellite of Uranus
Caliban
Uranus XVI
36[3] Satellite of Uranus
99 Dike 35.95 390 Asteroid
66 Maja 35.91 Asteroid
116 Sirona 35.85[36] Main-belt asteroid
44 Nysa 35.32 370 Main-belt asteroid — E-type
10370 Hylonome 35[20] Centaur
77 Frigga 34.63 350 Asteroid
55 Pandora 33.35 Asteroid
133 Cyrene 33.29[36] 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[36] Asteroid
101 Helena 32.9 300 Asteroid
108 Hecuba 32.49[90] 390 Asteroid
DesdemonaA
Uranus X
32 180 Satellite of Uranus
Halimede*
Neptune IX
31 Satellite of Neptune
52975 Cyllarus 31[20] Centaur
82 Alkmene 30.48 Asteroid
60 Echo 30.1 Asteroid
Comet Hale–Bopp
C/1995 O1
Hale-bopp.jpg
30[91] Comet
Pasiphaë*A
Jupiter VIII
30 300 Satellite of Jupiter
7066 Nessus 30[20][22] Centaur
Neso
Neptune XIII
30[3] Satellite of Neptune
64 Angelina 30[92] Main-belt asteroid — E-type
2008 KV42 29.5[93] Detached object
67 Asia 29.06 Asteroid
119 Althaea 28.65[36] 200 Main-belt asteroid — S-type
75 Eurydike 27.955[36] 180 Main-belt asteroid — M-type
142 Polana 27.645[36] 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[20] Centaur
Bianca
Uranus VIII
25.7[3] 92 Satellite of Uranus
Prospero
Uranus XVIII
25 85 Satellite of Uranus
Setebos
Uranus XIX
24[3] 75 Satellite of Uranus
123 Brunhild 23.985[36] Main-belt asteroid
4348 Poulydamas 23.95[94] Asteroid — Jupiter Trojan
1000 Piazzia 23.89[36] Main-belt asteroid
113 Amalthea 23.07[36] 100 Main-belt asteroid
Carme*
Jupiter IX
23 130 Satellite of Jupiter — Carme group
138 Tolosa 22.75[36] 99 Main-belt asteroid — S-type
126 Velleda 22.4[36] 94 Main-belt asteroid
73 Klytia 22.22 92 Asteroid
Sao
Neptune XI
22 Satellite of Neptune
125 Liberatrix 21.79[36] 87 Main-belt asteroid — M-type
Metis
Jupiter XVI (16)
Metis.jpg
21.5[95] 36 Satellite of Jupiter
132 Aethra 21.435[36] 82 Main-belt asteroid — M-type
Ophelia*
Uranus VII
21.4[3][4] 53 Satellite of Uranus
Laomedeia
Neptune XII
21 Satellite of Neptune
118 Peitho 20.87[36] 76 Main-belt asteroid
208 Lacrimosa 20.665[36] 73.9 Main-belt asteroid — Koronis — S-type
136 Austria 20.5[36] 68 Main-belt asteroid — M-type
131 Vala 20.22[36] 69 Main-belt asteroid
Cordelia*
Uranus VI
20.1[3] 44 Satellite of Uranus
Siarnaq
Saturn XXIX
20[84] Satellite of Saturn

Examples of objects between 20 km and 1 km in radius

Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Body Image Mean
radius
(km)
Mass
×1015 kg
(Eg)
Type of object
167 Urda 19.97[36] 66.7 Main-belt asteroid — Koronis — S-type
Hidalgo
944
19 Centaur (minor planet)
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[20] Cometcentaur
Lysithea*
Jupiter X
18 63 Satellite of Jupiter — Himalia group
158 Koronis 17.685[36] 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 SaturnDione trojan
226 Weringia 16.92[36] Main-belt asteroid — S-type
433 Eros$
Eros southern hemisphere overview.jpg
16.84 66.9 Near-Earth asteroid — Amor
Stephano
Uranus XX
16[3] 22 Satellite of Uranus
Albiorix
Saturn XXVI (16)
16 Satellite of Saturn
1036 Ganymed 15.9 33 Near-Earth asteroid
1815 Beethoven 15.8[22] Main-belt asteroid
243 Ida
243 Ida large.jpg
15.7[96] 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[20] Centaur
Perdita
Uranus XXV (15)
15[97] 13 Satellite of Uranus
Pan$
Saturn XVIII (18)
Pan side view.jpg
14.2[98] 4.95[98] Satellite of Saturn
Linus
Kalliope I
14[64] 60[99] Asteroid moon of 22 Kalliope
Ananke
Jupiter XII (12)
14[59] 38.2 Satellite of Jupiter
Telesto
Saturn XIII or Tethys B
Telesto cassini closeup.jpg
11.8[100] Satellite of SaturnTethys 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 or Tethys C
N00151485 Calypso crop.jpg
10.7[3] Satellite of SaturnTethys 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[36] 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[101] Main-belt asteroid[102]
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[103] 3.1 Damocloid (retrograde) & possible ejected SDO
Bestla
Saturn XXXIX - 34
7 Satellite of Saturn
S/2011 P 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[104] 2–3 Asteroid
Ijiraq
Saturn XXII - 22
6 Satellite of Saturn
S/2002 (121) 1
Hermione I
6[105] 1.6 Asteroid moon of 121 Hermione
1P/Halley
Halley's Comet, 1910.JPG
5.5[106] 0.03[107] Comet (75.3 year period)
S/2001 (107) 1
Camilla I
5.5[105] 1.5 Asteroid moon of 107 Camilla
Mab
Uranus XXVI (26)
5.0[108] Satellite of Uranus
Erriapus
Saturn XXVIII - 18
5.0 Satellite of Saturn
26858 Misterrogers 4.75 Asteroid
Callirrhoe
Jupiter XVII - 17
4.3 Satellite of Jupiter
Themisto
Jupiter XVIII - 38
4.0 0.69 Satellite of Jupiter
Daphnis
Saturn XXXV (35)
Daphnis raw 2010 cropped.jpg
3.9 [109] 0.084[98] 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[110][111] 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[112] Satellite of Saturn
4179 Toutatis
Toutatis.jpg
2.7[113] 0.05 Near-Earth asteroid
Megaclite
Jupiter XIX (19)
2.7[3]
–2.25[114]
Satellite of Jupiter
2867 Šteins
Steins.png
2.65[115] 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[116] Comet (6.85 year period) (Jupiter family)
2P/Encke
Comet Encke.jpg
2.4[117] 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[118] Comet[119]
81P/Wild
Wild 2
Wild2 3.jpg
2[120] 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 - 65
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[121] 0.03 Satellite of SaturnDione trojan
17P/Holmes
17pHolmes 071104 eder vga.jpg
1.7[122] Comet
Erinome
Jupiter XXV - 25
1.6 Satellite of Jupiter — Carme group
Methone
Saturn XXXII (32)
N00163251.jpg
1.6[3] 0.019 Satellite of Saturn
Arche
Jupiter XLIII - 63
1.5 Satellite of Jupiter
Hegemone
Jupiter XXXIX - 34
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 - 66
1.5 0.45 Satellite of Jupiter
Aitne
Jupiter XXXI - 31
1.5 Satellite of Jupiter
4055 Magellan
30June2010-4055Magellan.png
1.245[123] 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[124] 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)[125]
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)[125]
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

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,[126] 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).

Body Image Mean
radius
meters
Mass
×1012 kg
Type of object
1620 Geographos
Geographos.jpg
885[36] 4 Near-Earth asteroid — Apollo
1862 Apollo 850 5.1 Near-Earth asteroid — Apollo — Q-type
100000 Astronautica ≈800[127] Inner Main-belt Asteroid[128]
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[129] 1.3[130] Near-Earth asteroid — Apollo
(137108) 1999 AN10 650 Near-Earth asteroid — Apollo
(29075) 1950 DA
1950da color 150.jpg
600 3[131] 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

[132]

0.3[132] 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[133] Comet (dormant)[134]
2007 CA19 432 1.2 Near-Earth asteroid — Apollo
2062 Aten 450 0.76[135] Near-Earth asteroid — Aten
6489 Golevka 350[136] Near-Earth asteroid — Apollo
25143 Itokawa Itokawa4.jpg 346 0.0358 Near-Earth asteroid — Apollo
2004 XP14 300 Near-Earth asteroid — Apollo
(144898) 2004 VD17 290 3[137] Near-Earth asteroid — Apollo
Aegaeon
Saturn LIII
Aegaeon (2008 S1).jpg
250 Satellite of Saturn
2005 YU55
2005YU55-20111107.jpg
200[138] Near-Earth asteroid — Apollo — PHO
4660 Nereus
Nereus.jpg
165[139] Near-Earth asteroid — Apollo
S/2009 S 1
Saturn LXII (62)
PIA11665 moonlet in B Ring cropped.jpg
150 Satellite of Saturn
2010 TK7 150 Earth trojan — Apollo
99942 Apophis 2004MN4 Sormano.gif 135 0.05[137] Near-Earth asteroid — Aten — PHO
2007 TU24
2007 TU24 radar image 20080128.jpg
125[140] Near-Earth asteroid — Apollo — PHO
2002 JE9 100 NEA — Apollo — PHO
2010 XC15 100 NEA — Apollo — PHO
1994 WR12 65[141] 0.002[137] Near-Earth asteroid — Aten
2008 HJ [ 18 [142] 0.000005 [142] Near-Earth asteroid & fast rotator (42 s)[142]
1998 KY26 Asteroid 1998 KY26.faces model.jpg 15[143] 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

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

Selected Closely Imaged Objects
TheSun.png
Jupiter on 2010-06-07 (captured by the Hubble Space Telescope).jpg
Saturn (planet) large.jpg
Uranus2.jpg
Neptune.jpg
The Earth seen from Apollo 17.jpg
Venus-real.jpg
Sun
Jupiter
Saturn
Uranus
Neptune
Earth
Venus
Mars Hubble.jpg
Ganymede g1 true 2.jpg
Two Halves of Titan.png
Mercury in color - Prockter07 centered.jpg
Callisto.jpg
Io highest resolution true color.jpg
Full Moon Luc Viatour.jpg
Mars
Ganymede
Titan
Mercury
Callisto
Io
Moon
Europa-moon.jpg
Triton moon mosaic Voyager 2 (large).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
Umbriel moon 1.gif
Europa
Triton
Titania
Rhea
Oberon
Iapetus
Umbriel
Ariel-NASA.jpg
Dione (Mond) (30823363).jpg
Inset-sat tethys-large.jpg
Dawn-image-070911.jpg
Enceladus from Voyager.jpg
Miranda.jpg
Proteus (Voyager 2).jpg
Ariel
Dione
Tethys
Vesta
Enceladus
Miranda
Proteus
Mimas moon.jpg
Hyperion in natural colours.jpg
Phoebe cassini.jpg
PIA12714 Janus crop.jpg
Amalthea (moon).gif
PIA09813 Epimetheus S. polar region.jpg
Prometheus 12-26-09a.jpg
Mimas
Hyperion
Phoebe
Janus
Amalthea
Epimetheus
Prometheus
Flying By Pandora.jpg
(253) mathilde crop.jpg
Leading hemisphere of Helene - 20110618.jpg
Pandora
Mathilde
Helene

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 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

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