Article · Wikipedia archive · Last revised Jul 18, 2026

List of Solar System objects by size

This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most massive objects, volume, density, and surface gravity, if these values are available.

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Parts-per-million chart of the relative mass distribution of the Solar System, each cubelet denoting 2×1024 kg source ↗

This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most massive objects, volume, density, and surface gravity, if these values are available.

These lists contain 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.

Many trans-Neptunian objects (TNOs) have been discovered; in many cases their positions in this list are approximate, as there is frequently a large uncertainty in their estimated diameters due to their distance from Earth. There are uncertainties in the figures for mass and radius, and irregularities in the shape and density, with accuracy often depending on how close the object is to Earth or whether it has been visited by a probe.

Solar System objects more massive than 1021 kilograms are known or expected to be approximately spherical. Astronomical bodies relax into rounded shapes (spheroids), achieving hydrostatic equilibrium, when their own gravity is sufficient to overcome the structural strength of their material. It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup;1 however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time,2 and a 2019 assessment suggests that many TNOs in the size range of 400–1,000 kilometers may not even be fully solid bodies, much less gravitationally rounded.3 Objects that are ellipsoids due to their own gravity are here generally referred to as being "round", whether or not they are actually in equilibrium today, while objects that are clearly not ellipsoidal are referred to as being "irregular".

Spheroidal bodies typically have some polar flattening due to the centrifugal force from their rotation, and can sometimes even have quite different equatorial diameters (scalene ellipsoids such as Haumea). Unlike bodies such as Haumea, the irregular bodies have a significantly non-ellipsoidal profile, often with sharp edges.

There can be difficulty in determining the diameter (within a factor of about 2) for typical objects beyond Saturn . For TNOs there is some confidence in the diameters, but for non-binary TNOs there is no real confidence in the masses/densities. Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm3, but it is just as likely that they have a comet-like density of only 0.5 g/cm3.4

For example, if a TNO is incorrectly assumed to have a mass of 3.59×1020 kg based on a radius of 350 km with a density of 2 g/cm3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm3, its true mass would be only 1.12×1019 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; however, many of the moons with a radius less than ≈100 km, such as Jupiter's Himalia, have far more uncertain masses.5 Further out from Saturn, the sizes and masses of objects are less clear. There has not yet been an orbiter around Uranus or Neptune for long-term study of their moons. For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center6 and JPL Solar System Dynamics,5 give somewhat contradictory size and albedo estimates depending on which research paper is being cited.

Graphical overview

Relative diameters of the fifty largest measured bodies in the Solar System, colored by orbital region. Values are diameters in kilometers. Both scales are linear. source ↗

Objects with radii over 400 km

The following objects have a nominal volumetric radius of 400 km or greater. It was once expected that any icy body larger than approximately 200 km in radius was likely to be in hydrostatic equilibrium (HE).7 However, Ceres (r = 470 km) is the smallest body for which detailed measurements are consistent with hydrostatic equilibrium,8 whereas Iapetus (r = 735 km) is the largest icy body that has been found to not be in hydrostatic equilibrium.9 The known icy moons in this range are all ellipsoidal (except Proteus), but trans-Neptunian objects up to 450–500 km radius may be quite porous.10

For simplicity and comparative purposes, the values are manually calculated assuming that the bodies are all spheres. The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.11

Because Sedna has no known moons, directly determining its mass (estimated to be from 1.7×1021 to 6.1×1021 kg12) is impossible without sending a probe.

Bodynote 1 Image Radiusnote 2 Volume Mass Surface area Density Gravitynote 3 Type Discovery
(km) (R🜨) (109 km3) (V🜨) (1021 kg) (M🜨) (106 km2) 🜨 (g/cm3) (m/s2) (🜨)
Sun
source ↗
695700 ± ?13 109.214 1,409,300,00014 1,301,00014 1988475000±9200015 333,00014 6,078,70014 11,91814 1.40914 274.014 27.9414 G2V-class star prehistoric
Jupiter
source ↗
69886±0.416 10.97 1,431,280 1,321 1898125±8817 317.83 61,41918 120.41 1.3262±0.000317 24.7917 2.528 gas giant planet; has rings prehistoric
Saturn
source ↗
58232±617
(136775 for A Ring)
9.140 827,130 764 568317±2617 95.162 42,61219 83.54 0.6871±0.000217 10.4417 1.065 gas giant planet; has rings prehistoric
Uranus
source ↗
25362±717 3.981 68,340 63.1 86809.9±4.017 14.536 8083.120 15.85 1.270±0.00117 8.6917 0.886 ice giant planet; has rings 1781
Neptune
source ↗
24622±1917 3.865 62,540 57.7 102409.2±4.817 17.147 7618.321 14.94 1.638±0.00417 11.1517 1.137 ice giant planet; has rings 1846
Earth
source ↗
6371.0084±0.000117 1 1,083.21 1 5972.17±0.2817 1 510.0644722 1 5.5134±0.000317 9.8117 1 terrestrial planet prehistoric
Venus
source ↗
6051.8±1.017 0.9499 928.43 0.857 4867.31±0.2317 0.815 460.223 0.903 5.243±0.00317 8.8717 0.905 terrestrial planet prehistoric
Mars
source ↗
3389.5±0.217 0.5320 163.18 0.151 641.691±0.03017 0.107 144.3724 0.283 3.9340±0.000717 3.7117 0.379 terrestrial planet prehistoric
Ganymede
Jupiter III
source ↗
2634.1±0.325 0.4135 76.30 0.0704 148.19 0.0248 86.99926 0.171 1.93625 1.428 0.146 moon of Jupiter (icy) 1610
Titan
Saturn VI
source ↗
2574.73±0.0927 0.4037a 71.50 0.0658 134.518±0.00328 0.0225 83.305429 0.163 1.880±0.00430 1.354 0.138 moon of Saturn (icy) 1655
Mercury
source ↗
2439.4±0.117 0.3829 60.83 0.0562 330.103±0.02117 0.0553 74.79731 0.147 5.4289±0.000717 3.7017 0.377 terrestrial planet prehistoric
Callisto
Jupiter IV
source ↗
2410.3±1.532 0.3783 58.65 0.0541 107.594 0.018 73.00533 0.143 1.834±0.00332 1.23603 0.126 moon of Jupiter (icy) 1610
Io
Jupiter I
source ↗
1821.6±0.55 0.2859 25.32 0.0234 89.32 0.015 41.69834 0.082 3.528±0.00635 1.797 0.183 moon of Jupiter (terrestrial) 1610
Moon
Earth I
source ↗
1737.4±0.136 0.2727 21.958 0.0203 73.4637 0.0123 37.93738 0.074 3.344±0.00536 1.625 0.166 moon of Earth (terrestrial) prehistoric
Europa
Jupiter II
source ↗
1560.8±0.55 0.2450 15.93 0.0147 48.00 0.008035 30.61339 0.06 3.013±0.005 1.316 0.134 moon of Jupiter (terrestrial) 1610
Triton
Neptune I
source ↗
1353.4±0.9a27 0.2124a 10.38 0.0096 21.39±0.03 0.003599 23.01840 0.045 2.061 0.782 0.0797 moon of Neptune (icy) 1846
Pluto
134340
source ↗
1188.3±0.841 0.187 7.057 0.00651 13.03±0.03 0.0022 17.79 0.034 1.853±0.00442 0.620 0.063 dwarf planet; plutino; multiple 1930
Eris
136199
source ↗
1163±6b43 0.1825b 6.59 0.0061 16.38±0.2c 0.0028 17 0.033 2.43±0.05 0.824 0.083 dwarf planet; SDO; binary 2003
Titania
Uranus III
source ↗
788.4±0.646 0.1237d 2.06 0.0019 3.4550±0.050947 0.00059 7.8248 0.015 1.683 0.378 0.0385 moon of Uranus 1787
Haumea
136108
source ↗
772+20
−19
49
0.12 1.98e 0.0018 3.95244+0.01109
−0.01103
51
0.00066 8.14 0.016 2.050+0.157
−0.152
49f
0.401 0.0409 dwarf planet;
resonant KBO (7:12);
trinary; has rings
2004
Rhea
Saturn V
source ↗
763.5±0.552 0.1199d 1.87 0.0017 2.307 0.00039 7.3453 0.014 1.2372±0.002952 0.26 0.027 moon of Saturn 1672
Oberon
Uranus IV
source ↗
761.4±2.6a27 0.1195a 1.85 0.0017 3.1104±0.074947 0.0005 7.28554 0.014 1.682 0.347 0.035 moon of Uranus 1787
Iapetus
Saturn VIII
source ↗
734.4±2.85552 0.1153 1.66 0.0015 1.806 0.00033 6.8 0.013 1.0887±0.012752 0.223 0.0227 moon of Saturn 1671
Makemake
136472
source ↗
715±756 0.112 1.53 0.0014 2.69±0.2057g 0.00045 6.4 0.013 1.76±0.17 0.35 0.0357 dwarf planet; cubewano 2005
Gonggong
225088
source ↗
615±2558g 0.0983 1.03 0.0009 1.75±0.0758 0.00029 4.753 0.009 1.74±0.1658 0.3 0.0306 dwarf planet; resonant SDO (3:10) 2007
Charon
Pluto I
source ↗
606.0±0.541 0.0951 0.932 0.0009 1.5897±0.004542
0.00025 4.57859 0.009 1.705±0.00642 0.288 0.0294 moon of Pluto 1978
Umbriel
Uranus II
source ↗
584.7±2.827 0.0918 0.837 0.0008 1.2885±0.022547 0.00020 4.360 0.008 1.539 0.234 0.024 moon of Uranus 1851
Ariel
Uranus I
source ↗
578.9±0.627 0.0909 0.813 0.0007 1.2331±0.018047 0.000226 4.21161 0.008 1.517 0.269 0.027 moon of Uranus 1851
Dione
Saturn IV
source ↗
561.4±0.45552 0.0881 0.741 0.0007 1.0954868±0.000024652 0.000183 3.96562 0.008 1.478±0.003 0.232 0.0237 moon of Saturn 1684
Quaoar
50000
source ↗
548.8±1.163 0.0879 0.737 0.0007 1.212±0.00563 0.0002 3.83 0.008 1.751±0.01363 0.3 0.0306 dwarf planet; cubewano; binary; has rings 2002
Tethys
Saturn III
source ↗
531.1±0.66452 0.0834 0.624 0.0006 0.6174959±0.000014652 0.000103 3.5765 0.007 0.984±0.00364 0.145 0.015 moon of Saturn 1684
Ceres
1
source ↗
469.7±0.166 0.0742 0.433 0.0004 0.938392±0.00000567 0.000157 2.8568 0.00668 2.1616±0.002567 0.28 0.029 dwarf planet; belt asteroid 1801
Orcus
90482
source ↗
455+25
−20
69
0.0719 0.404 0.0004 0.548±0.01045 0.000092 1.4±0.245 0.2 0.0204 dwarf planet; plutino; binary 2004
Sedna
90377
source ↗
453+157
−129
70
0.0785 0.516 0.0005 dwarf planet; sednoid; detached object 2003
Salacia
120347
source ↗
419±2271 0.0664 0.373 0.0003 0.4861+0.0076
−0.0074
72g
0.000082 1.5±0.173 0.185 0.0168 cubewano; binary 2004
  star    giant planet    terrestrial planet    dwarf planet    possible dwarf planet    moon of Earth    moon of Jupiter    moon of Saturn    moon of Uranus    moon of Neptune    moon of Pluto

Smaller objects by mean radius

From 200 to 399 km

All imaged icy moons with radii greater than 200 km except Proteus are clearly round, although those under 400 km that have had their shapes carefully measured are not in hydrostatic equilibrium.74 The known densities of TNOs in this size range are remarkably low (1–1.2 g/cm3), implying that the objects retain significant internal porosity from their formation and were never gravitationally compressed into fully solid bodies.10 Many intrinsically bright TNOs like 2018 VG18 and 2017 OF201 do not have directly measured sizes (e.g. via stellar occultation and radiometry of thermal emission), so their sizes are estimated based on an assumed albedo.75 In the list below, TNOs with unmeasured sizes are only listed if they have been mentioned in press releases and the scientific literature.

Bodynote 1 Image Radiusnote 2
(km)
Mass
(1018 kg)
Density
(g/cm3)
Typenote 4 Refsnote 5
r · M
Máni
307261
source ↗
398±12 cubewano 76
Achlys
208996
source ↗
386±6 (area equivalent) ≈ 200h 0.87±0.01 (assuming HE)79 plutino; binary 79
Aya
55565
source ↗
384+19.5
−19
cubewano 80
2010 JO179
574372
≈ 375±75i SDO 81
Chiminigagua
532037
source ↗
371+39
−41.5
SDO; binary 82
2017 OF201
source ↗
≈ 350i eTNO 83
Ixion
28978
source ↗
348.390+5.375
−4.435
(area equivalent)
plutino 84
2021 DR15
source ↗
345±80i SDO 85
Goibniu
90568
source ↗
340±17 cubewano 86
Ritona
145452
source ↗
339.5+27.5
−36.5
cubewano 86
2015 RR245
523794
source ↗
≈ 335i resonant KBO (2:9) 87
Uni
55637
source ↗
329.5±19 125±3g 0.82±0.11 cubewano; binary 88 · 89
Varuna
20000
source ↗
327+77
−51
≈ 160 0.992+0.086
−0.015
90
cubewano 91
2003 UZ413
455502
source ↗
325+0.5
−87.5
≈ 300j 2.64 plutino 92
Varda
174567
source ↗
324 244±6h ≈1.949 cubewano; binary 49 · 94
Rumina
145451
source ↗
≈ 322 SDO 9596
Gǃkúnǁʼhòmdímà
229762
source ↗
317+5
−4
136.1±3.3 1.007+0.050
−0.049
49
SDO; binary 49 · 97
2014 UZ224 (DeeDee)
source ↗
317.5+28.5
−30.5
SDO 98
2008 OG19
470599
309.5+28
−56.5
i
0.609±0.004 SDO 99 · 99
Dysnomia
Eris I
source ↗
307.5+60
−50
82±57 0.7±0.5 moon of Eris 45
2007 JJ43
278361
source ↗
305+85
−70
i
cubewano 100
2004 XR190 (Buffy)
612911
source ↗
300±85 SDO 101
2005 QU182
303775
292+77.5
−72
SDO 92
2014 EZ51
523692
source ↗
> 288 SDO 102
Xewioso
78799
source ↗
283+36
−37
cubewano 103
2015 BP519 (Caju)
768325
275±75i eTNO 104
Vesta
4
source ↗
262.7±0.1 259.0271±0.0058 3.456±0.035105 belt asteroid type V 105 · 106
2003 VS2
84922
source ↗
262±4 plutino 107
Pallas
2
source ↗
256±2 204±3 2.92±0.08 belt asteroid type B 108109
2004 TY364
120348
256+19
−20
cubewano 110
2005 TB190
145480
source ↗
253.5+63.5
−58
detached object 110111
Enceladus
Saturn II
source ↗
252.1±0.2 108.0±0.1 1.609±0.005 moon of Saturn 55 · 112
2002 TC302
84522
source ↗
250±7 resonant SDO (2:5) 113
2018 VG18 (Farout) ≈ 250i resonant SDO (2:9) 114
2005 UQ513
202421
249+32
−38
cubewano 80
Miranda
Uranus V
source ↗
235.8±0.7 62.93±3.00 1.148 moon of Uranus 115 · 47
Dziewanna
471143
source ↗
235+18
−5
SDO 116
2002 XV93
612533
source ↗
235+22
−15
plutino 117
1999 DE9
26375
231±23 resonant SDO (2:5) 118
2003 FY128
120132
230±11 SDO 111
2012 VP113 (Biden)
source ↗
≈ 225i sednoid 119
2002 VR128
84719
224+24
−22
plutino 120
Vanth
Orcus I
source ↗
221±5 87±8 1.5+1.0
−0.5
moon of 90482 Orcus 121 · 45
Hygiea
10
source ↗
216±4 87.4±6.9 2.06±0.20 belt asteroid type C 122 · 109
2004 NT33
444030
212+44
−40
cubewano 80
Proteus
Neptune VIII
source ↗
210±7 15.5–31k ≈ 0.46–0.91124 moon of Neptune 5 · 5
Chaos
19521
source ↗
208+42
−15
equivalent
cubewano 125
2001 QF298
469372
source ↗
204+20
−22
plutino 120
Huya
38628
source ↗
203±8 40.1 1.073±0.066 plutino; binary 126 · 127
2004 PF115
175113
203+49
−38
plutino 120
Ilmarë
Varda I
source ↗
201.5±20 22 moon of 174567 Varda 71

Legend:

SDO – scattered disc object
cubewano – classical Kuiper belt object
plutino – 2:3 orbital resonance with Neptune

From 100 to 199 km

This list contains a selection of objects estimated to be between 100 and 199 km in radius (200 and 399 km in diameter), being 200 km nicknamed the "potato radius" by astronomers. The largest of these may have a hydrostatic-equilibrium shape, but most are irregular (i.e., potato-shaped). 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).128 Many TNOs are omitted from this list as their sizes are poorly known.75

Bodynote 1 Image Radiusnote 2
(km)
Mass
(1018 kg)
Type Refsnote 5
r · M
2004 UX10
144897
199+16.3
−19.7
≳ 30 plutino 120 · 129
1993 SC
15789
199+55
−85.5
≈ 47 plutino 130
Mimas
Saturn I
source ↗
198.2±0.3 37.49±0.03 moon of Saturn 55 · 11227
1998 SN165
35671
196±20 cubewano 80
Actaea
Salacia I
source ↗
196.5±16.5 20 moon of 120347 Salacia 71
2002 KX14
119951
source ↗
194.6±4.4 cubewano 131
Hiʻiaka
Haumea I
source ↗
185±10 16±2 moon of Haumea 132 · 132
2001 UR163
42301
source ↗
176±42.5 resonant KBO (4:9) 133
Nereid
Neptune II
source ↗
170±25 35.7 moon of Neptune 27
1996 TL66
15874
170±10 SDO 111
2004 XA192
230965
170+60
−47.5
SDO 120
Interamnia
704
source ↗
166±3 35.2±5.1 belt asteroid type F 134 · 109
Europa
52
source ↗
160±2 23.9±3.8 belt asteroid type C 109
1999 CD158
469306
< 155 ≈ 48 resonant KBO (4:7) 135
2007 OC10
470316
165+28
−27.5
≈ 30 SDO 136
2023 KQ14 (Ammonite)
source ↗
150±40i sednoid 137
Davida
511
source ↗
149±2 26.6±7.3 belt asteroid type C 109
2002 TX300
55636
source ↗
143±5 ≈ 11 cubewano, Haumea family 138 · 138
2003 OP32
120178
137+23.5
−12.5
≈ 45 cubewano, Haumea family 135
Sylvia
87
source ↗
137±2 14.3±0.5 outer belt asteroid type X; trinary 109
Lempo
47171
source ↗
136±9 6.71 plutino; trinary 139
Eunomia
15
source ↗
135±2 30.5±1.9 belt asteroid type S 109
Hyperion
Saturn VII
source ↗
135±4 5.62±0.05 moon of Saturn 74 · 7427
Euphrosyne
31
source ↗
134±2 16.5±2.6 belt asteroid type C; binary 109
1998 SM165
26308
source ↗
134±14 6.87±1.8 resonant KBO (1:2) 140 · 140
Cybele
65
source ↗
131.5±1.5 14.8±1.8 outer belt asteroid type C 141
Juno
3
source ↗
127±1 27.0±2.4 belt asteroid type S 109
Hiisi
Lempo II
source ↗
126±8 5.273 secondary of 47171 Lempo 139
Hektor
624
source ↗
125±13 7.9±1.4 Jupiter trojan (L4) type D; binary 142 · 142
Chariklo
10199
source ↗
124.8+3.0
−2.3
6.4±0.5 centaur; has rings 143
Sila
79360
source ↗
124±15 5.89 cubewano; binary 144145
2007 RW10
309239
124±15 quasi-satellite of Neptune 111
Altjira
148780
source ↗
123+19
−70
2.388 cubewano; binary 80146
Nunam
79360
source ↗
118±15 4.892 secondary of 79360 Sila 144147
Bamberga
324
source ↗
114±2 10.2±0.9 belt asteroid type C 109
Patientia
451
112.9±2.3 10.9±5.3 belt asteroid type C 148 · 149
Psyche
16
source ↗
112±2 26.2±2.9 belt asteroid type M 109
Ceto
65489
source ↗
112±5 5.4±0.4 extended centaur; binary 111 · 150
Herculina
532
source ↗
111.2±2.4 10 belt asteroid type S 151
Moon of 148780 Altjira
source ↗
110+17
−62
1.695 secondary of 148780 Altjira 80152
Hesperia
69
source ↗
110±15 5.86±1.18 belt asteroid type M 151 · 149153
Leleākūhonua
541132
110+14
−10
sednoid 154
Thisbe
88
source ↗
109±2 11.6±2.2 belt asteroid type B 109
Doris
48
source ↗
108±2 6.9±2.9 belt asteroid type C 109
Phoebe
Saturn IX
source ↗
106.5±0.7 8.29±0.01 moon of Saturn 74 · 7427
Moon of 38628 Huya
source ↗
106±15 5.1 moon of 38628 Huya 126
Fortuna
19
source ↗
105.5±1.0 8.8±1.4 belt asteroid type G 109
Camilla
107
source ↗
105±4 11.2±0.3 outer belt asteroid type C; trinary 148 · 149
Themis
24
source ↗
104±2 6.2±2.9 belt asteroid type C 109
Amphitrite
29
source ↗
102±1 12.7±2.0 belt asteroid type S 109
Egeria
13
source ↗
101±2 9.2±2.1 belt asteroid type G 109
Iris
7
source ↗
100±5 13.5±2.3 belt asteroid type S 109
Legend:
centaur – asteroids orbiting between the outer planets
Jupiter trojan – asteroids located in Jupiter's L4 and L5 Lagrange points

From 50 to 99 km

This list contains a selection of objects 50 and 99 km in radius (100 km to 199 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following reference.75 Asteroid spectral types are mostly Tholen, but some might be SMASS.

Bodynote 1 Image Radiusnote 2
(km)
Mass
(1018 kg)
Type Refsnote 5
r · M
Elektra
130
source ↗
99.5±1 6.4±0.2 belt asteroid type G; multiple 109
Bienor
54598
99+3
−3.5
1.119 centaur 155156
Chiron
2060 or 95P
source ↗
98±17 centaur; has rings 157
Hebe
6
source ↗
97.5±1.5 12.4±2.4 belt asteroid type S 109
Larissa
Neptune VII
source ↗
97±3 ≈ 4.2 moon of Neptune 158 · l27
Ursula
375
source ↗
96.8±1.3 8.4±5.3 belt asteroid type C 160 · 149
Eugenia
45
source ↗
94±1 5.8±0.1 belt asteroid type F; trinary 109
Hermione
121
source ↗
94±3 5.0±0.3 outer belt asteroid type C; binary 161 · 149
Daphne
41
source ↗
94±7 6.1±0.9 belt asteroid type C; binary 109
Aurora
94
source ↗
93.8±3.6 6.2±3.6 belt asteroid type C 162 · 149
Bertha
154
source ↗
93.4±0.9 9.2±5.2 belt asteroid type C 149 · 149
1995 SM55
24835
93.4±0.9 cubewano, Haumea family 163
Moon of 532037 Chiminigagua 93+12.5
−13
moon of 532037 Chiminigagua 82
Janus
Saturn X
source ↗
89.5±1.4 1.898±0.001 moon of Saturn 74 · 74
Teharonhiawako
88611
source ↗
89+16
−18
2.44±0.03 cubewano; binary 80 · 164
Aegle
96
88.9±0.8 6.4±6.3 belt asteroid type T 148 · 149
Galatea
Neptune VI
source ↗
88±4 2.12±0.08 moon of Neptune 158 · 16527
S/2015 (136472) 1 (MK2)
source ↗
87.5 4.939 moon of Makemake 166167
Phorcys
Ceto I
source ↗
87+8
−9
≈ 1.67 secondary of 65489 Ceto 150 · 150
Palma
372
source ↗
86.8±1.4 5.2±0.6 belt asteroid type B 168 · 149
Metis
9
source ↗
86.5±1 8.0±1.9 belt asteroid type S 148 · 149
Alauda
702
source ↗
86±28 6.06±0.36 belt asteroid type C; binary 168 · 169
Hilda
153
source ↗
85.3±1.6 outer belt asteroid; Hildas 151
Himalia
Jupiter VI
source ↗
85 4.2±0.6 moon of Jupiter 5 · 170
Freia
76
source ↗
84.2±1.0 2.0±4.2 outer belt asteroid type P/type X 160 · 149
Amalthea
Jupiter V
source ↗
83.45±2.4 2.08±0.15 moon of Jupiter 171 · 17227
Agamemnon
911
source ↗
83.3±2.0 Jupiter trojan (L4) type D 151
Elpis
59
82.6±2.3 3±0.5 belt asteroid type CP/type B 148 · 149
Eleonora
354
source ↗
82.5±1.5 7.5±2.7 belt asteroid type A 109
Weywot
Quaoar I
source ↗
≈ 82.5 2.4+1.2
−1.1
moon of Quaoar 63
Nemesis
128
source ↗
81.5±2.5 3.4±1.7 belt asteroid type C 109
Puck
Uranus XV
source ↗
81±2 1.91 moon of Uranus 173174
2002 KW14
307251
80.5+17.5
−20
≈ 30 cubewano 80
Sycorax
Uranus XVII
source ↗
78.5+11.5
−7.5
moon of Uranus 175
Io
85
source ↗
77.4±1.9 2.6±1.5 belt asteroid type FC/type B 151 · 149
Minerva
93
source ↗
77.08±0.65 3.5±0.4 belt asteroid type C; trinary 148 · 149
Alexandra
54
source ↗
77.07±0.32 6.2±3.5 belt asteroid type C 148 · 149
Laetitia
39
77±2 4.7±1.1 belt asteroid type S 149 · 149
Nemausa
51
source ↗
75±1.5 3.9±1.6 belt asteroid type G 109
Kalliope
22
source ↗
75±2.5 7.7±0.4 belt asteroid type M; binary 109
Despina
Neptune V
source ↗
75±3 0.71 moon of Neptune 27176
Namaka
Haumea II
source ↗
75±25 1.18±0.25 moon of Haumea 177 · 51
Manwë
385446
source ↗
≈ 75 ≈ 1.41 resonant KBO (4:7); binary 178 · 178
Pales
49
≈ 74.9 4.2±2.2 belt asteroid type C 151 · 149
Parthenope
11
source ↗
74.5±1 5.5±0.4 belt asteroid type S 109
Arethusa
95
source ↗
74.0±2.4 belt asteroid type C 162
Pulcova
762
source ↗
73.7±0.4 1.4±0.1 belt asteroid type F; binary 148 · 179
Flora
8
source ↗
73±1 4.0±1.6 belt asteroid type S 109
Ino
173
source ↗
72.5±1.5 2.2±1.3 belt asteroid type Xc 109
Adeona
145
source ↗
72±1.5 2.4±0.3 belt asteroid type Xc 109
Irene
14
source ↗
72±1 2.9±1.9 belt asteroid type S 160 · 149
Gǃòʼé ǃHú
Gǃkúnǁʼhòmdímà I
source ↗
71±4 secondary of 229762 Gǃkúnǁʼhòmdímà 180
Aglaja
47
71±4 3.2±1.7 belt asteroid type C 149 · 149
Melpomene
18
source ↗
70.5±1 4.5±0.9 belt asteroid type S 109
Lamberta
187
source ↗
70.5±1 1.9±0.3 belt asteroid type Ch 109
Patroclus
617
source ↗
70.2±0.4 1.36±0.11 Jupiter trojan (L5) type P; binary 148 · 149
Julia
89
source ↗
70±1.4 4.3±3.2 belt asteroid type S 109
Typhon
42355
source ↗
69±4.5 0.87±0.03 resonant SDO (7:10); binary 155 · 181
ǂKá̦gára
469705
source ↗
69±12 1.29±0.07 cold classical KBO; binary 182
Massalia
20
source ↗
67.8±1.8 5±1.04 belt asteroid type S 168 · 149
Portia
Uranus XII
source ↗
67.6±4 moon of Uranus 5
Emma
283
source ↗
66.2±0.1 1.38±0.03 belt asteroid type X; binary 148 · 149
Paha
Lempo I
source ↗
66+4
−4.5
0.746±0.001 moon of 47171 Lempo 139 · 183
Lucina
146
source ↗
65.9±? belt asteroid type C 184
Sawiskera
Teharonhiawako I
source ↗
65.5+12
−13
secondary of 88611 Teharonhiawako 80
Achilles
588
source ↗
65.0±0.3 Jupiter trojan (L4) type DU 148
Panopaea
70
64.0±0.4 4.33±1.09 belt asteroid type C 148 · 149
Thule
279
63.3±1.8 outer belt asteroid type D 151
Borasisi
66652
source ↗
63+12.5
−25.5
3.433±0.027 cubewano; binary 80 · 185
Albion
15760
≈ 62.5i TNO, first KBO discovered
Hestia
46
62.07±1.7 3.5 belt asteroid type P/type Xc 151 · 186
Leto
68
source ↗
61.3±1.6 3.28±1.9 belt asteroid type S 148 · 149
ǃHãunu
ǂKá̦gára I
source ↗
61±9 0.89±0.05 secondary of 469705 ǂKá̦gára 187
Undina
92
60.46±0.85 4.43±0.25 belt asteroid type X 160 · 149
Bellona
28
source ↗
60.45±1.90 2.62±0.15 belt asteroid type S 188 · 149
Diana
78
60.30±1.35 1.27±0.13 belt asteroid type C 189 · 149
Anchises
1173
source ↗
60.2±1.5 Jupiter trojan (L5) type P 160
Bernardinelli-Bernstein
C/2014 UN271
source ↗
60±7 comet 190
Galatea
74
59.4±1.4 6.13±5.36 belt asteroid type C 191 · 149
Deiphobus
1867
59.1±0.8 Jupiter trojan (L5) type D 192
Äneas
1172
59.01±0.40 Jupiter trojan (L5) type D 193
Kleopatra
216
source ↗
59±1 3.0±0.3 belt asteroid type M; trinary 109
Athamantis
230
source ↗
59±1 2.3±1.1 belt asteroid type S 109
Diomedes
1437
source ↗
58.89±0.59 Jupiter trojan (L4) type D 194
Terpsichore
81
58.9±0.4 6.19±5.31 belt asteroid type C 195 · 149
Epimetheus
Saturn XI
source ↗
58.1±1.8 0.5266±0.0006 moon of Saturn 74 · 74
Victoria
12
source ↗
58±1 2.7±1.3 belt asteroid type S 109
Circe
34
source ↗
57.7±1.0 ≈ 3.66±0.03 belt asteroid type C 148 · 149
Leda
38
source ↗
57.7±0.7 5.71±5.47 belt asteroid type C 149 · 149
Odysseus
1143
57.3±0.3 Jupiter trojan (L4) type D 196
Alcathous
2241
56.8±0.9 Jupiter trojan (L5) type D 197
Melete
56
source ↗
56.62±0.85 4.61 belt asteroid type P 151 · 149
Mnemosyne
57
56.3±1.4 ≈ 12.6±2.4 belt asteroid type S 198 · 149
Nestor
659
56.2±0.9 Jupiter trojan (L4) type XC 199
Harmonia
40
source ↗
55.6±0.2 belt asteroid type S 200
Euterpe
27
source ↗
54.9±0.8 1.67±1.01 belt asteroid type S 160 · 149
Antilochus
1583
54.4±0.3 Jupiter trojan (L4) type D 148
Thorondor
Manwë I
source ↗
54 0.5 secondary of 385446 Manwë 178 · 178
Thalia
23
source ↗
53.8±1.1 1.96±0.09 belt asteroid type S 201 · 149
Erato
62
source ↗
53.5±0.3 belt asteroid type BU/type Ch 202
Astraea
5
source ↗
53.3±1.6 2.9 belt asteroid type S 203 · 186
Pabu
Borasisi I
source ↗
52.5+10
−21
secondary of 66652 Borasisi 80
Eos
221
51.76±2.8 ≈ 5.87±0.34 belt asteroid type S/type K 149 · 149
Aegina
91
51.7±0.2 belt asteroid type C 204
Leukothea
35
source ↗
51.5±0.6 belt asteroid type C 205
Menoetius
Patroclus I
source ↗
51.4±0.25 secondary of 617 Patroclus 206
Isis
42
source ↗
51.4±1.4 1.58±0.52 belt asteroid type S 149 · 149
Klotho
97
source ↗
50.4±0.3 1.33±0.13 belt asteroid type M 148 · 149
Troilus
1208
source ↗
50.3±0.5 Jupiter trojan (L5) type FCU 207

From 20 to 49 km

This list includes few examples since there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 49 km.208 Many thousands of objects of this size range have yet to be discovered in the trans-Neptunian region. The number of digits is not an endorsement of significant figures. The table switches from ×1018 kg to ×1015 kg (Eg). Most mass values of asteroids are assumed.149209

Bodynote 1 Image Radiusnote 2
(km)
Mass
(1015 kg)
Type – notes Refsnote 5
r · M
Asterope
233
49.8±0.6 belt asteroid type T/type K 210
Pholus
5145
49.5+7.5
−7
centaur 155
Thebe
Jupiter XIV
source ↗
49.3±2 moon of Jupiter 171
Lutetia
21
source ↗
49±1 1700±20 belt asteroid type M 109
Kalypso
53
source ↗
48.631±13.299 ≈ 5630±5000 belt asteroid type XC 211 · 149
Notburga
626
source ↗
48.42±2.335 belt asteroid type XC 149
Proserpina
26
source ↗
47.4±0.85 748±895 belt asteroid type S 212 · 149
Juliet
Uranus XI
source ↗
46.8±4 moon of Uranus 5
Urania
30
source ↗
44±1 1300±900 belt asteroid type S 109
Ausonia
63
source ↗
46.5±1.5 1200±200 belt asteroid type S 109
Beatrix
83
44.819±1.326 belt asteroid type X 148
Concordia
58
44.806±0.419 belt asteroid type C 148
Echidna
Typhon I
source ↗
44.5±3 moon of 42355 Typhon 181
Automedon
2920
44.287±0.898 Jupiter trojan (L4) type D 213
Antiope
90
43.9±0.5 828±22 belt asteroid type C; binary 214 · 214
Prometheus
Saturn XVI
source ↗
43.1±2.7 159.5±1.5 moon of Saturn 74 · 74
Danaë
61
42.969±1.076 2890±2780 belt asteroid type S 215 · 149
Thetis
17
source ↗
42.449±1.014 1200 belt asteroid type S 216 · 209
Pandora
55
source ↗
42.397±1.251 belt asteroid type M 217
Huenna
379
42.394±0.779 383±19 belt asteroid type B/type C; binary 218 · 219
Virginia
50
42.037±0.121 2310±700 belt asteroid type X/type Ch 220 · 149
Feronia
72
source ↗
41.975±2.01 ≈ 3320±8490 belt asteroid type TDG 149 · 149
S/2000 (90) 1
Antiope I
41.9±0.5 secondary of 90 Antiope 214
Poulydamas
4348
41.016±0.313 Jupiter trojan (L5) type C 221
Logos
58534
source ↗
41±9 458±6.9 cubewano; binary 222 · 222
Pandora
Saturn XVII
source ↗
40.7±1.5 137.1±1.9 moon of Saturn 74 · 74
Thalassa
Neptune IV
source ↗
40.7±2.8 moon of Neptune 158
Niobe
71
source ↗
40.43±0.4 belt asteroid type S 160
Pomona
32
source ↗
40.38±0.8 belt asteroid type S 223
Belinda
Uranus XIV
source ↗
40.3±8 moon of Uranus 5
Elara
Jupiter VII
source ↗
39.95±1.7 moon of Jupiter 224
Cressida
Uranus IX
source ↗
39.8±2 moon of Uranus 5
Amycus
55576
38.15±6.25 centaur 118
Hylonome
10370
source ↗
37.545 centaur 225
Socus
3708
37.831±0.404 Jupiter trojan (L5) type C 148
Nysa
44
source ↗
37.83±0.37 belt asteroid type E 160
Rosalind
Uranus XIII
source ↗
36±6 moon of Uranus 5
Maja
66
source ↗
35.895±0.46 belt asteroid type C 160
Ariadne
43
source ↗
35.67±0.627 ≈ 1210±220 belt asteroid type S 226 · 149
Iphigenia
112
35.535±0.26 ≈ 1970±6780 belt asteroid type C 149 · 149
Xiangliu
Gonggong I
≈ 35±15 moon of 225088 Gonggong
Dike
99
source ↗
33.677±0.208 belt asteroid type C 227
Echeclus
60558 or 174P
32.3±0.8 centaur 155
Desdemona
Uranus X
source ↗
32±4 moon of Uranus 5
Eurybates
3548
source ↗
31.943±0.149 Jupiter trojan (L4) type CP 148
Eurynome
79
source ↗
31.739±0.476 belt asteroid type S 228
Eurydike
75
31.189±0.802 belt asteroid type M 229
Halimede
Neptune IX
source ↗
≈ 31 moon of Neptune 5
Phocaea
25
source ↗
30.527±1.232 599±60 belt asteroid type S 148 · 149
Naiad
Neptune III
source ↗
30.2±3.2 moon of Neptune 158
Schwassmann–
Wachmann 1

29P
source ↗
30.2±3.7 comet 230
Neso
Neptune XIII
source ↗
≈ 30 moon of Neptune 5
Angelina
64
source ↗
29.146±0.541 belt asteroid type E 231
Pasiphae
Jupiter VIII
source ↗
28.9±0.4 moon of Jupiter 224
Alkmene
82
source ↗
28.811±0.357 belt asteroid type S 232
Nessus
7066
source ↗
28.5±8.5 centaur 155
Polana
142
27.406±0.139 belt asteroid type F 233
Bianca
Uranus VIII
source ↗
27±2 moon of Uranus 5
Mathilde
253
source ↗
26.4 103.3±4.4 belt asteroid type C 234 · 235
Hidalgo
944
source ↗
26.225±1.8 centaur 160
Orus
21900
source ↗
25.405±0.405 Jupiter trojan (L4) type C/type D 148
Amalthea
113
25.069±0.633 belt asteroid type S; binary 148
Prospero
Uranus XVIII
source ↗
≈ 25 moon of Uranus 5
Setebos
Uranus XIX
source ↗
≈ 24 moon of Uranus 5
Carme
Jupiter XI
source ↗
23.35±0.45 moon of Jupiter 224
Klytia
73
source ↗
22.295±0.471 belt asteroid type S 236
Sao
Neptune XI
source ↗
≈ 22 moon of Neptune 5
Echo
60
source ↗
21.609±0.286 315±32 belt asteroid type S 237 · 149
Metis
Jupiter XVI
source ↗
21.5±2 ≈ 119.893 moon of Jupiter 171 · 238
Ophelia
Uranus VII
source ↗
21.4±4 moon of Uranus 5
Lysithea
Jupiter X
source ↗
21.1±0.35 moon of Jupiter 224
Caliban
Uranus XVI
source ↗
21+10
−6
moon of Uranus 175
Laomedeia
Neptune XII
source ↗
≈ 21 moon of Neptune 5
Cordelia
Uranus VI
source ↗
20.1±3 moon of Uranus 5
Psamathe
Neptune X
source ↗
≈ 20 moon of Neptune 5

From 1 to 19 km

This list contains some examples of Solar System objects between 1 and 19 km in radius. This is a common size for asteroids, comets and irregular moons.

Bodynote 1 Image Radiusnote 2
(km)
Mass
(1015 kg)
Type – notes Refsnote 5
r · M
Urda
167
source ↗
19.968±0.132 belt asteroid type S 239
Hydra
Pluto III
source ↗
19.65 48±42 moon of Pluto 240 · 241
Siarnaq
Saturn XXIX
source ↗
19.65±2.95 moon of Saturn 224
Koronis
158
source ↗
19.513±0.231 belt asteroid type S 242
Nix
Pluto II
source ↗
19.017 45±40 moon of Pluto 240 · 241
Ganymed
1036
source ↗
18.838±0.199 ≈ 167±318 Amor asteroid type S 148 · 149
Okyrhoe
52872
18±0.6 centaur 243
Blarney
2320
18 belt asteroid 244
Helene
Saturn XII
source ↗
17.6±0.4 moon of Saturn; Dione trojan (L4) 74
Sinope
Jupiter IX
source ↗
17.5±0.3 moon of Jupiter 224
Hippocamp
Neptune XIV
source ↗
17.4±1 ≈ 50 moon of Neptune 158 · 158
Leucus
11351
source ↗
17.078±0.323 Jupiter trojan (L4) type D 148
Stephano
Uranus XX
source ↗
≈ 16 moon of Uranus 5
Arrokoth
486958
source ↗
15.85±0.25 cubewano; contact binary 245
Ida
243
source ↗
15.7 42±6 belt asteroid type S; binary 246 · 247
Atlas
Saturn XV
source ↗
15.1±0.9 6.6 moon of Saturn 74 · 74
Great comet
C/1811 F1
source ↗
15 - 20 comet 248
Ananke
Jupiter XII
source ↗
14.55±0.3 moon of Jupiter 224
Albiorix
Saturn XXVI
source ↗
14.3±2.7 moon of Saturn 224
Linus
Kalliope I
14±1 ≈ 60 asteroid moon of 22 Kalliope 249 · 250
Dioretsa
20461
14±3 centaur; damocloid 251
Pan
Saturn XVIII
source ↗
13.7±0.3 4.30±0.22 moon of Saturn 252 · 252
Perdita
Uranus XXV
source ↗
13±1 moon of Uranus 5
Telesto
Saturn XIII
source ↗
12.4±0.4 moon of Saturn; Tethys trojan (L4) 74
Mab
Uranus XXVI
source ↗
12±1 moon of Uranus 5
Phobos
Mars I
source ↗
11.1±0.15 10.659 moon of Mars 253 · 254
Paaliaq
Saturn XX
source ↗
≈ 11 moon of Saturn 5
Francisco
Uranus XXII
≈ 11 moon of Uranus 5
Leda
Jupiter XIII
source ↗
10.75±0.85 moon of Jupiter 224
Calypso
Saturn XIV
source ↗
10.7±0.7 moons of Saturn; Tethys trojan (L5) 74
Polymele
15094
source ↗
10.548±0.068 Jupiter trojan (L4) type P 151
Margaret
Uranus XXIII
source ↗
≈ 10 moon of Uranus 5
Ferdinand
Uranus XXIV
source ↗
≈ 10 moon of Uranus 5
Cupid
Uranus XXVII
source ↗
9±1 moon of Uranus 5
Ymir
Saturn XIX
source ↗
≈ 9 moon of Saturn 5
Trinculo
Uranus XXI
≈ 9 moon of Uranus 5
Eros
433
source ↗
8.42±0.02 6.687±0.003 Amor asteroid type S 255 · 255
Adrastea
Jupiter XV
source ↗
8.2±2 moon of Jupiter 5
Kiviuq
Saturn XXIV
source ↗
≈ 8 moon of Saturn 5
Tarvos
Saturn XXI
source ↗
≈ 7.5 moon of Saturn 5
Kerberos
Pluto IV
source ↗
≈ 6.333 16±9 moon of Pluto 256 · 257
Gaspra
951
source ↗
6.266 20–30 belt asteroid type S 258 · 259
Deimos
Mars II
source ↗
6.27±0.07 1.51 moon of Mars 260 · 260
Skamandrios
Hektor I
6±1.5 asteroid moon of 624 Hektor 142
Ijiraq
Saturn XXII
source ↗
≈ 6 moon of Saturn 5
Tsuchinshan–ATLAS
C/2023 A3
source ↗
<5.9±0.2 comet 261
Halley's Comet
1P
source ↗
5.75 0.22 comet 262 · 263
Styx
Pluto V
source ↗
≈ 5.5 ≈ 7.65 moon of Pluto 256 · 257
Romulus
Sylvia I
source ↗
5.4±2.8 asteroid moon of 87 Sylvia 264
Masursky
2685
source ↗
5.372±0.085 belt asteroid type S 265
Erriapus
Saturn XXVIII
source ↗
≈ 5 moon of Saturn 5
Callirrhoe
Jupiter XVII
source ↗
4.8±0.65 moon of Jupiter 224
Alexhelios
Kleopatra I
source ↗
4.45±0.8 asteroid moon of 216 Kleopatra 266
Esclangona
1509
4.085±0.3 inner belt asteroid type S; binary 267
Themisto
Jupiter XVIII
source ↗
≈ 4 moon of Jupiter 5
Daphnis
Saturn XXXV
source ↗
3.8±0.8 0.077±0.015 moon of Saturn 74 · 74
Petit-Prince
Eugenia I
3.5±1 asteroid moon of 45 Eugenia 268
Praxidike
Jupiter XXVII
source ↗
3.5±0.35 moon of Jupiter 224
Bestla
Saturn XXXIX
source ↗
≈ 3.5 moon of Saturn 5
Remus
Sylvia II
source ↗
≈ 3.5 asteroid moon of 87 Sylvia 264
Kalyke
Jupiter XXIII
source ↗
3.45±0.65 moon of Jupiter 224
Cleoselene
Kleopatra II
source ↗
3.45±0.8 asteroid moon of 216 Kleopatra 266
Moon of 31 Euphrosyne 3.35±1.2 asteroid moon of 31 Euphrosyne 269
Tempel 1
9P
source ↗
3±0.1 Jupiter-family comet; Deep Impact flyby and impacted 270
Ireland
5029
3 belt asteroid 271
Phaethon
3200
source ↗
2.9 Apollo asteroid type F 272
1999 JM8
53319
source ↗
2.7±0.6 Apollo asteroid type X 273
Borrelly
19P
source ↗
2.66 Jupiter-family comet 274
Šteins
2867
source ↗
2.58±0.084 belt asteroid type E 148
Atira
163693
source ↗
2.4±0.25 Atira asteroid type S; binary 275
Annefrank
5535
source ↗
2.4 belt asteroid type S 276
Balam
3749
source ↗
2.332±0.107 0.51±0.02 belt asteroid type S; trinary 277 · 278
Pallene
Saturn XXXIII
source ↗
2.22±0.07 moon of Saturn 279
Florence
3122
source ↗
2.201±0.015 0.079±0.002 Amor asteroid type S; trinary 162 · 280
Wild 2
81P
source ↗
2.133 Jupiter family comet 281
Litva
2577
2.115 Mars-crosser type EU; trinary 282
Churyumov–Gerasimenko
67P
source ↗
2 0.00998 Jupiter-family comet 283 · 284
Donaldjohanson
52246
source ↗
1.948±0.007 belt asteroid type C 285
Camelot
9500
1.9 belt asteroid 286
Cuno
4183
source ↗
1.826±0.051 Apollo asteroid type S/type Q 287
1986 DA
6178
1.575 Amor asteroid type M 288
Pichi üñëm
Alauda I
1.55±0.45 asteroid moon of 702 Alauda 289
Toutatis
4179
source ↗
1.516 0.0505 Apollo asteroid type S 290 · 290
Kaʻepaokaʻāwela
514017
1.5 Jupiter trojan 291
Methone
Saturn XXXII
source ↗
1.45±0.03 moon of Saturn 279
Carpo
Jupiter XLVI
1.44 Moon of Jupiter
Gault
6478
source ↗
1.4+0.2
−0.1
Phocaea asteroid type S 292
1998 QE2
285263
source ↗
1.375 Amor asteroid type S; binary 293
Polydeuces
Saturn XXXIV
source ↗
1.3±0.4 moon of Saturn; Dione trojan (L5) 74
2001 SN263
153591
source ↗
1.315±0.2 0.00951±0.00013 Amor asteroid type C; trinary 294 · 295
S/2003 (1509) 1
Moon of 1509 Esclangona
1.285 asteroid moon of 1509 Esclangona 296
APL
132524
source ↗
≈ 1.25 belt asteroid type S 297
Camillo
3752
source ↗
1.153±0.044 Apollo asteroid type S 162
Cruithne
3753
source ↗
1.036±0.053 Aten asteroid type Q; quasi-satellite of Earth 298
1996 HW1
8567
source ↗
1.01 Amor asteroid 299

Below 1 km

This list contains examples of objects below 1 km in radius. That means that irregular bodies can have a longer chord in some directions, hence the mean radius averages out. 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,300 many of which are in the range 0.5–1.0 km. Countless more have a radius below 0.5 km. Very few objects in this size range have been explored or even imaged. The exceptions are objects that have been visited by a probe, or have passed close enough to Earth to be imaged. Radius is by mean geometric radius. Number of digits not an endorsement of significant figures. Mass scale shifts from × 1015 to 109 kg, which is equivalent to one billion kg or 1012 grams (Teragram – Tg). Currently most of the objects of mass between 109 kg to 1012 kg (less than 1000 teragrams (Tg)) listed here are near-Earth asteroids (NEAs). The Aten asteroid 1994 WR12 has less mass than the Great Pyramid of Giza, 5.9 × 109 kg. For more about very small objects in the Solar System, see meteoroid, micrometeoroid, cosmic dust, and interplanetary dust cloud. (See also Visited/imaged bodies.)

Object Image Radiusnote 2
(m)
Mass
(109 kg)
Type – notes Refsnote 5
r · M
Ra-Shalom
2100
source ↗
990±25 Aten asteroid type C 160
Geographos
1620
source ↗
980±30 Apollo asteroid type S 148
Midas
1981
source ↗
975±35 Apollo asteroid type S 160
Mithra
4486
source ↗
924.5±11 Apollo asteroid type S 162
2006 VW139
300163
source ↗
900±0.1 Active asteroid 301
1998 OH
12538
831.5±164.5 Apollo asteroid type S 162
Tantalus
2102
source ↗
824.5±22.5 Apollo asteroid type Q 302
Braille
9969
source ↗
820 Mars-crosser type Q 303
2005 GO21
308242
source ↗
780 Aten asteroid type S 304
Apollo
1862
source ↗
≈ 750 Apollo asteroid type Q 305
1999 JD6
85989
source ↗
731±10.5 Aten asteroid type K; contact binary 306
Icarus
1566
source ↗
730 Apollo asteroid type S 307
Dactyl
Ida I
source ↗
700 asteroid moon of 243 Ida 308
Castalia
4769
700 Apollo asteroid type S; contact binary 309
2007 PA8
214869
source ↗
675±70 Apollo asteroid type Q 310
Moshup
66391
source ↗
658.5±20 2490±54 Aten asteroid type S; binary 311 · 312
1950 DA
29075
source ↗
653 ≈ 2000 Apollo asteroid type S 313 · 314
2006 HY51
394130
609±114 Apollo asteroid 315
Hartley 2
103P
source ↗
570±80 ≈ 300 Jupiter-family comet 316 · 316
2003 SD220
163899
source ↗
515 Aten asteroid type S 317
Nyx
3908
source ↗
500±75 Amor asteroid type V 318
Wikipedia
274301
475 Vestian asteroid 319 · 320
Astronautica
100000
470 Hungaria asteroid type E 319 · 320
2001 WN5
153814
466±5.5 Apollo asteroid 321
2017 YE5
source ↗
450±25 Apollo asteroid type S; binary 322
Ryugu
162173
source ↗
432.5±7.5 ≈ 450 Apollo asteroid type Cg 323 · 324
1997 AE12
162058
423.5±6.5 Amor asteroid type S 325
2014 JO25
671294
source ↗
409 Apollo asteroid type S; contact binary 326
Hermes
69230
source ↗
400±50 Apollo asteroid type Sq 327
Didymos
65803
source ↗
390±4 527 Apollo asteroid type Xk; binary 328 · 329
Dinkinesh
152830
source ↗
369 belt asteroid type Sq 330
Aten
2062
365±15 Aten asteroid type S 148
Aegaeon
Saturn LIII
source ↗
330±60 moon of Saturn 279
2015 TB145
source ↗
325±15 Apollo asteroid type S 331
2001 WR1
172034
315.5±9 Amor asteroid type S 332
1994 CC
136617
source ↗
310±30 266±32.9 Apollo asteroid type Sq; trinary 333 · 334
LINEAR
252P
source ↗
300±30 Jupiter-family comet 335
Golevka
6489
source ↗
265±15 Apollo asteroid type Q 336
ATLAS
3I
source ↗
260 - 374 Interstellar comet 337
2000 WO107
153201
source ↗
255±41.5 Aten asteroid type X 338
Bennu
101955
source ↗
245.03±0.08 78±9 Apollo asteroid type B 339 · 340
Torifune
98943
232.5±7.5 Apollo asteroid 341
2002 CU11
163132
230±8.5 Apollo asteroid 342
Squannit
Moshup I
source ↗
225.5±13.5 asteroid moon of 66391 Moshup 312
2014 HQ124
source ↗
204.5±84 Aten asteroid type S 148
2013 YP139
source ↗
201±13 Apollo asteroid 343
2008 EV5
341843
source ↗
200±7 Aten asteroid type X/type C 162
2006 DP14
388188
source ↗
≈ 200 Apollo asteroid type S; contact binary 344
1988 EG
6037
199.5±1.35 Apollo asteroid type S 345
2010 TK7
706765
source ↗
189.5±61.5 Aten asteroid; Earth trojan (L4) 346
2006 SU49
292220
≈ 188.5 ≈ 73 Apollo asteroid 347 · 347
2005 YU55
308635
source ↗
180±20 Apollo asteroid type C 348
2010 SO16
419624
178.5±63 Apollo asteroid; co-orbital with Earth 343
Itokawa
25143
source ↗
173 35.1±1.05 Apollo asteroid type S 349 · 349
Nereus
4660
source ↗
165 Apollo asteroid 350
Apophis
99942
source ↗
162.5±7.5 ≈ 61 Aten asteroid type Sq 351 · 352
S/2009 S 1
source ↗
≈ 150 moon of Saturn 353
2005 WK4
277475
source ↗
142 Apollo asteroid type S 354
2004 BL86
357439
source ↗
131.5±13 Apollo asteroid type V; binary 355
2007 TU24
source ↗
125 Apollo asteroid type S 356
Zoozve
524522
≈ 118 Aten asteroid type X; co-orbital with Venus 357
2011 UW158
436724
source ↗
110±20 Apollo asteroid type S 358
Hathor
2340
105±0.015 Aten asteroid type S 359
Dimorphos
Didymos I
source ↗
85±15 asteroid moon of 65803 Didymos 329
Cardea
164207
source ↗
81.5 Apollo asteroid; quasi-satellite of Earth 360
2017 BQ6
source ↗
78 Apollo asteroid type S 361
1994 WR12 65 Aten asteroid 362
YORP
54509
source ↗
61.8 Apollo asteroid type S 363
2019 OK 28.5 – 165 Apollo asteroid 364
Duende
367943
source ↗
23.75 Aten asteroid type L 365
Kamoʻoalewa
469219
20.5 Apollo asteroid type S; quasi-satellite of Earth 366
2012 TC4
source ↗
11.5 Apollo asteroid type E/type Xe 367
2014 RC
source ↗
≈ 11 Apollo asteroid type Sq 368
1998 KY26
source ↗
5.5±1 Apollo asteroid type X 369
2010 RF12 ≈ 3.5 ≈ 0.0005 Apollo asteroid 370
2011 MD
source ↗
3+2
−1
Apollo asteroid/Amor asteroid type S 371
2020 VT4 2.5 - 5.5 Aten asteroid 364
2012 KT42 2.1 - 4.7 Apollo asteroid 364
2008 TC3
source ↗
2.05 0.00008 Apollo asteroid type F/type M 372
2023 BU
source ↗
1.5 Apollo asteroid 373
2015 TC25
source ↗
1 Apollo asteroid type E 374
2018 LA 0.8 - 2.6 Apollo asteroid 319 · 375
2025 TF 0.6 - 1.35 Apollo asteroid 364
2011 CQ1 0.5 - 1.15 Aten asteroid 364
2020 CD3
source ↗
0.45±0.05 Apollo asteroid 376
2020 CW 0.41 - 0.9 Apollo asteroid 364
2008 TS26 0.305 - 0.68 Apollo asteroid 377
2015 FF415 0.25 Apollo asteroid 319 · 378
2024 BX1 0.22 Apollo asteroid 379
2025 UC11 0.205 - 0.465 Aten asteroid 364
2022 WJ1 0.2 - 0.3 Apollo asteroid 380
EN131090
source ↗
0.1425 - 0.15 0.000000044 Apollo asteroid 381
Solar system planets, major moons, and 3 stars of different sizes are shown comparatively in three levels of zoom: one for the rocky planets, one for the gas giants, and one for the stars. source ↗
Largest moons of the Solar System to scale. source ↗
See also

See also

Notes

Notes

  1. Radius estimated using equatorial radius and assuming body is spherical
  2. Radius has been determined by various methods, such as optical (Hubble), thermal (Spitzer), or direct imaging via spacecraft
  3. The mass of Eris by itself is the difference between the mass of the system ((1.6466±0.0085)×1022 kg)44 and the mass of Dysnomia by itself ((8.2±5.7)×1019 kg).45
  4. Radius estimated by using three radii and assuming body is spheroid
  5. Calculated in Wolfram Alpha using semi axes of 1050 × 840 × 53750(Ellipsoid volume: 1.98395×10^9 km3)
  6. Best fit physical model assuming hydrostatic equilibrium for Haumea.50
  7. This value refers to the system mass
  8. Mass calculated by Muñoz-Gutiérrez et al. (2019 & 2021) using Achlys's area-equivalent diameter of 772 km and predicted density of 0.87 g/cm3.77: 2 78: 2  Muñoz-Gutiérrez et al. give the mass in terms of Earth masses (M🜨), which can be converted into kilograms by multiplying by 5.9722×1024 kg/M🜨. This calculation does not treat Achlys as an ellipsoid (which would have a volume of V = 4 3 π a b c 1.85 × 10 17  m 3 {\displaystyle V={\frac {4}{3}}\pi abc\approx 1.85\times 10^{17}{\text{ m}}^{3}} ), though the mass calculated from Achlys's ellipsoid volume and density ( M = ρ V 1.61 × 10 20  kg {\displaystyle M=\rho V\approx 1.61\times 10^{20}{\text{ kg}}} ) is equivalent to Muñoz-Gutiérrez et al.'s mass calculation when rounded to a single digit. Cite error: The named reference "mass" was defined multiple times with different content (see the help page).
  9. Radius estimated from an assumed albedo
  10. very approximate figure, assuming equivalent spherical diameter of ≈600 km and density ≈2.64 g/cm3
  11. A density of 0.4–0.8 g/cm3 was calculated when assuming the volume as a sphere with a radius of 210±7 km.123 The mass was calculated with the provided density and the assumed volume.
  12. The mass estimate is based on the assumed density of 1.2 g/cm3, and a volume of 3.5 ×106 km3 obtained from a detailed shape model in Stooke (1994).159
  1. Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
  2. Volumetric radius including uncertainties
  3. Given as surface gravity (1 bar for gaseous planets)
  4. Figures from default source Johnston's Archive—List of Known Trans-Neptunian Objects,75 if otherwise not mentioned in the References column
  5. Reference column specifically for radius (r) and mass (M) citations
References

References

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  141. Marsset et al. (2022) The equilibrium shape of (65) Cybele: primordial or relic of a large impact?
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  144. Johnston, Wm. Robert (20 September 2014). "(79360) Sila-Nunam". Johnston's Archive. Retrieved 28 April 2019.
  145. Based on a spherical diameter of 250 km and a density of 0.73 g/cm3
  146. Mass calculated using diameter and density
  147. Based on a spherical diameter of 235 km and a density of 0.73 g/cm3
  148. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. 247: EAR–A–COMPIL–5–NEOWISEDIAM–V1.0. Bibcode:2016PDSS..247.....M. Retrieved 31 October 2018.
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  156. Mass calculated using dimensions of 254, 110, and 90 km and a density of 0.85
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  162. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 118700974.
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  191. "JPL Small-Body Database Browser: 74 Galatea" (2018-05-22 last obs). Retrieved 2 May 2019.
  192. "JPL Small-Body Database Browser: 1867 Deiphobus (1971 EA)" (2018-06-21 last obs). Retrieved 2 May 2019.
  193. "JPL Small-Body Database Browser: 1172 Aneas (1930 UA)" (2018-07-03 last obs). Retrieved 1 May 2019.
  194. "JPL Small-Body Database Browser: 1437 Diomedes (1937 PB)" (2018-10-22 last obs). Retrieved 30 April 2019.
  195. "JPL Small-Body Database Browser: 81 Terpsichore" (2018-10-22 last obs). Retrieved 2 May 2019.
  196. "JPL Small-Body Database Browser: 1143 Odysseus (1930 BH)" (2018-10-22 last obs). Retrieved 2 May 2019.
  197. "JPL Small-Body Database Browser: 2241 Alcathous (1979 WM)" (2018-06-17 last obs). Retrieved 2 May 2019.
  198. "JPL Small-Body Database Browser: 57 Mnemosyne" (2018-06-25 last obs). Retrieved 30 April 2019.
  199. "JPL Small-Body Database Browser: 659 Nestor (A908 FE)" (2018-10-22 last obs). Retrieved 2 May 2019.
  200. "JPL Small-Body Database Browser: 40 Harmonia" (2018-09-15 last obs). Retrieved 3 May 2019.
  201. "JPL Small-Body Database Browser: 23 Thalia" (2018-10-21 last obs). Retrieved 2 May 2019.
  202. "JPL Small-Body Database Browser: 62 Erato" (2018-05-24 last obs). Retrieved 3 May 2019.
  203. "JPL Small-Body Database Browser: 5 Astraea" (2018-09-16 last obs). Retrieved 30 April 2019.
  204. "JPL Small-Body Database Browser: 91 Aegina" (2018-07-31 last obs). Retrieved 3 May 2019.
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  211. "JPL Small-Body Database Browser: 53 Kalypso" (2018-10-18 last obs). Retrieved 30 April 2019.
  212. "JPL Small-Body Database Browser: 26 Prosperina" (2018-10-22 last obs). Retrieved 3 May 2019.
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  215. "JPL Small-Body Database Browser: 61 Danae" (2018-07-13 last obs). Retrieved 4 May 2019.
  216. "JPL Small-Body Database Browser: 17 Thetis" (2018-05-13 last obs). Retrieved 3 May 2019.
  217. "JPL Small-Body Database Browser: 55 Pandora" (2018-10-22 last obs). Retrieved 4 May 2019.
  218. "JPL Small-Body Database Browser: 379 Huenna (A894 AA)" (2018-08-30 last obs). Retrieved 3 May 2019.
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  227. "JPL Small-Body Database Browser: 99 Dike" (2018-10-24 last obs). Retrieved 4 May 2019.
  228. "JPL Small-Body Database Browser: 79 Eurynome" (2018-08-18 last obs). Retrieved 4 May 2019.
  229. "JPL Small-Body Database Browser: 75 Eurydike" (2019-05-08 last obs). Retrieved 3 June 2019.
  230. "JPL Small-Body Database Browser: 29P/Schwassmann-Wachmann 1" (2018-10-16 last obs). Retrieved 4 May 2019.
  231. "JPL Small-Body Database Browser: 64 Angelina" (2019-05-09 last obs). Retrieved 3 June 2019.
  232. "JPL Small-Body Database Browser: 82 Alkmene" (2019-05-09 last obs). Retrieved 3 June 2019.
  233. "JPL Small-Body Database Browser: 142 Polana" (2019-05-08 last obs). Retrieved 4 May 2019.
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  375. est. 0.05–0.3
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Further reading

Further reading

External links