List of Solar System objects by size

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

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

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

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

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

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

There can be difficulty in 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 masses/densities. Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm3, but it is just as likely that they have a comet-like density of only 0.5 g/cm3.[2] For example, if a TNO is poorly assumed to have a mass of 3.59×1020 kg based on a radius of 350 km with a density of 2 g/cm3 and is later discovered to only have a radius of 175 km with a density of 1 g/cm3, the mass estimate would be only 2.24×1019 kg.

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

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

Graphical overview[edit]

Solar-system-top50-diameter.svg
Relative sizes of the fifty largest objects in the Solar System, colored by orbital region. Values are diameters in km.

List of objects by radius[edit]

Larger than 750 km[edit]

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

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

Body(a) Image Radius(b) Volume Mass Density Gravity(c) Type Shape #(d)
(km) (R) (109 km3) (V) (1021 kg) (M) (g/cm3) (m/s2) ()
Sun The Sun in extreme ultraviolet.jpg 696342±65[9] 109.3 1,414,300,000 1,305,700 1,988,550,000 333,000 1.408 274.0 28.02 star round (HE) 1
Jupiter Jupiter New Horizons.jpg 69911±6 10.97 1,431,280 1,321 1,898,600 317.83 1.326 24.79 2.535 planet (gas giant); has rings round (HE) 2
Saturn Saturn PIA06077.jpg 58232±6
(w/o rings)
9.140 827,130 764 568,460 95.159 0.687 10.445 1.06 planet (gas giant); has rings round (HE) 3
Uranus Uranus2.jpg 25362±7 3.981 68,340 63.1 86,832 14.536 1.27 8.87 0.90 planet (ice giant); has rings round (HE) 4
Neptune Neptune Full.jpg 24622±19 3.865 62,540 57.7 102,430 17.147 1.638 11.15 1.140 planet (ice giant); has rings round (HE) 5
Earth Earth-DSCOVR-20150706-IFV.jpg 6371.0 1 1,083.21 1 5,973.6 1 5.514 9.78033 0.99732 planet (terrestrial) round (HE) 6
Venus Venus-real color.jpg 6051.8±1.0
(w/o gas)
0.9499 928.43 0.857 4,868.5 0.815 5.243 8.872 0.905 planet (terrestrial) round (HE) 7
Mars Mars 23 aug 2003 hubble.jpg 3389.5±0.2 0.5320 163.18 0.151 641.85 0.107 3.9335 ± 0.0004 3.7 0.38 planet (terrestrial) round (HE) 8
Ganymede
Jupiter III
Moon Ganymede by NOAA.jpg 2634.1±0.3 0.4135 76.30 0.0704 148.2 0.0248 1.936 1.428 0.15 moon of Jupiter round (HE) 9
Titan
Saturn VI
Two Halves of Titan.png 2576±2
(w/o gas)
0.4043 71.52 0.0660 134.5 0.0225 1.8798 ± 0.0044 1.354 0.14 moon of Saturn round (HE) 10
Mercury Mercury in color - Prockter07 centered.jpg 2439.7±1.0 0.3829 60.83 0.0562 330.2 0.0553 5.427 3.7 0.38 planet (terrestrial) round (HE) 11
Callisto
Jupiter IV
Callisto.jpg 2410.3±1.5 0.3783 58.65 0.0541 107.6 0.018 1.8344 ± 0.0034 1.23603 0.126 moon of Jupiter round (HE) 12
Io
Jupiter I
Io highest resolution true color.jpg 1821.6±0.5 0.2859 25.32 0.0234 89.3 0.015 3.528 ± 0.006 1.797 0.183 moon of Jupiter round (HE) 13
Moon
Earth I
FullMoon2010.jpg 1737.1 0.2727 21.958 0.0203 73.5 0.0123 3.3464 1.625 0.166 satellite of Earth round (HE) 14
Europa
Jupiter II
Europa-moon.jpg 1560.8±0.5 0.2450 15.93 0.0147 48 0.00803 3.013 ± 0.005 1.316 0.134 moon of Jupiter round (HE) 15
Triton
Neptune I
Triton Voyager 2.jpg 1353.4±0.9 0.2124 10.38 0.0096 21.5 0.00359 2.061 0.782 0.0797 moon of Neptune round 16
Pluto
134340
Global LORRI mosaic of Pluto in true colour.jpg 1186±2[10] 0.186 6.95 0.0066 13.105 0.0022 2.03 ± 0.06 0.61 0.062 dwarf planet; plutino; multiple round 17
Eris
136199
Eris and dysnomia2.jpg 1163±6[11] 0.1825 6.59 0.007 16.7[12] 0.0027 2.52 ± 0.05 0.662 0.0677 dwarf planet; SDO; binary round 18
Titania
Uranus III
Titania (moon) color cropped.jpg 788.4±0.6 0.1238 2.06 0.0019 3.526 0.00059 1.711 ± 0.005 0.378 0.0385 moon of Uranus round 19
Rhea
Saturn V
PIA07763 Rhea full globe5.jpg 763.8±1.0 0.1199 1.87 0.0017 2.3166 0.00039 1.236 ± 0.005 0.26 0.027 moon of Saturn round (HE) (disputed) 20
Oberon
Uranus IV
Voyager 2 picture of Oberon.jpg 761.4±2.6 0.1195 1.85 0.0017 3.014 0.0005 1.63 ± 0.05 0.347 0.035 moon of Uranus round 21
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn II" for Enceladus), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c,d) Figures from default source Johnston's Archive—List of Known Trans-Neptunian Objects,[13] if otherwise not mentioned in References

Legend:

      belt asteroid        moon of Saturn        moon of Uranus        moon of Neptune        Dysnomia, moon of Eris
SDO – scattered disc object,
cubewano – classical Kuiper belt object

200–750 km[edit]

All imaged icy moons except Proteus with radii greater than 200 km are round, though those under 750 km that have had their shapes carefully measured are not in hydrostatic equilibrium. Most asteroids are rockier and less likely to be round: 10 Hygiea is not, while 2 Pallas and 4 Vesta are borderline.

Body(a) Image Radius(b) Volume Mass Density Gravity(c) Type Shape #(d)
(km) (R) (109 km3) (V) (1021 kg) (M) (g/cm3) (m/s2) ()
Iapetus
Saturn VIII
Iapetus as seen by the Cassini probe - 20071008.jpg 734.5±2.8 0.1152 1.55 0.0014 1.9739 0.00033 1.088 ± 0.013 0.223 0.0227 moon of Saturn round (not in HE) 22
Makemake
136472
Makemake hubble.png 715±7 0.112 1.7 2.3 ± 0.9 dwarf planet; cubewano round 23
2007 OR10
225088
640±105[14] 0.1005 1.0981 0.00101 resonant KBO (3:10) unknown 24
Haumea
136108
620+34
29
0.097 1.3–1.6 0.001 4.006 0.00069 2.55[15] 0.44 0.045 dwarf planet; resonant KBO (7:12); trinary round (scalene ellipsoid) 25
Charon
Pluto I
Charon by New Horizons on 13 July 2015.png 603.5±1.5 0.0947 0.87 0.0008 1.52 0.00025 1.65 ± 0.06 0.279 0.028 moon of Pluto round 26
Umbriel
Uranus II
PIA00040 Umbrielx2.47.jpg 584.7±2.8 0.0918 0.84 0.0008 1.2 0.00020 1.39 ± 0.16 0.234 0.024 moon of Uranus round 27
Ariel
Uranus I
Color Image of Ariel as seen from Voyager 2.jpg 578.9±0.6 0.0909 0.81 0.0008 1.35 0.00022 1.66 ± 0.15 0.269 0.027 moon of Uranus round 28
Dione
Saturn IV
Dione color south.jpg 561.4±0.4 0.0881 0.73 0.0007 1.096 0.000183 1.478 ± 0.003 0.232 0.0236 moon of Saturn round (not in HE) 29
Quaoar
50000
Quaoar hubble.jpg 555±3 0.0871 1.4 ± 0.1 0.0003 2.2 ± 0.4[16] 0.125 cubewano; binary unknown 30
Tethys
Saturn III
Saturn's Moon Tethys as seen from Voyager 2.jpg 531.1±0.6 0.0834 0.624 0.0006 0.6173 0.000103 0.984 ± 0.003[17] 0.145 0.015 moon of Saturn round (not in HE) 31
Sedna
90377
Sedna PRC2004-14d.jpg 500±80 0.0785 sednoid; detached object unknown 32
Ceres
1
PIA19562-Ceres-DwarfPlanet-Dawn-RC3-image19-20150506.jpg 473[18] 0.0736 0.433 0.0004 0.939[19] 0.000157 2.17 0.29 0.030 dwarf planet; belt asteroid round 33
2002 MS4
307261
467±24 0.0733 cubewano[13] unknown 34
Orcus
90482
Orcus nasa.jpg 458±13 0.0719 2.47[20] plutino; binary unknown 35
Salacia
120347
425±23 0.0667 0.45 ± ? 1.16+0.59
−0.36
[21]
cubewano; binary unknown 36
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Jupiter I" for Io), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Given as gravity on the "surface" (1 bar)
(d) Ranking by radius of the largest bodies in the Solar System, may not reflect the latest updates of measured radii
Body(a) Image Radius(b)
(km)
Mass
(1020 kg)
Density
(g/cm3)
Type(c) Remarks – Shape(d) Refs (c)
rad. · Mass
2013 FY27 553 SDO large range of estimated diameters 500–1,105 km · M
2002 AW197
55565
384+20
18
other TNO, detached object r[22] · M[22]
2003 AZ84
208996
385 plutino; binary minor planet · M
2002 UX25
55637
335±17 1.25 0.82 cubewano?; binary minor planet; r[22] · M[23]
Varda
174567
358 2.65 1.25 cubewano?; binary minor planet r[22] · M[22]
Dysnomia
Eris I
342±25 moon of Eris large range of estimated diameters 100–660 km r[24] · M
2004 GV9
90568
340±40 cubewano · M
2005 RN43
145452
340±40 cubewano · M
Varuna
20000
334+77
43
3.7 0.99[15] cubewano r[25] · M
Ixion
28978
Ixion planetoid nasa.jpg
325+130
110
plutino · M
2007 UK126
229762
300±40 SDO · M
Chaos
19521
300±70 cubewano · M
2007 JJ43
278361
~300 cubewano · M
2010 KZ39 ~300 cubewano[26] · M
2012 VP113 ~300 sednoid · M
2010 RF43 ~300 SDO · M
2005 RM43
145451
~300 SDO · M
2001 UR163
42301
~300 SDO · M
2002 TC302
84522
290±50 resonant KBO (2:5) · M
2002 XV93 280±10 plutino · M
2003 UZ413 ~280 plutino · M
2008 ST291 ~318 SDO · M
2010 RE64 ~280 SDO · M
2010 FX86 ~280 cubewano · M
2006 QH181 ~280 SDO · M
Pallas
2
PallasHST2007.jpg 270±10 2.11 2.8[27] belt asteroid uncertain · M
2014 UM33 ~270 cubewano · M
2004 XR190 ~270 SDO · M
Vesta
4
Vesta full mosaic.jpg 262.7±0.1 2.59 3.46 belt asteroid formerly round (not in hydrostatic equilibrium: frozen-in ellipsoidal shape and large impact basins)[28][29] r[30] · M[30]
2003 VS2
84922
260±20 plutino · M
2004 TY364
120348
~260 cubewano · M
2010 VK201 ~260 cubewano · M
2014 FT71 ~253 · M
Enceladus
Saturn II
Enceladus from Voyager.jpg 252.1±0.2 1.08 1.61 moon of Saturn round (not in hydrostatic equilibrium: frozen-in ellipsoidal shape) · M
2005 UQ513
202421
250±40 cubewano · M
2003 QX113 ~250 SDO · M
2014 FC69 ~250 · M
2002 WC19
119979
245 twotino; binary minor planet · M
2010 EK139 240±70 SDO · M
Miranda
Uranus V
Miranda.jpg 235.8±0.7 0.66 1.2 moon of Uranus round · M
2005 TB190
145480
230±30 detached object · M
1999 DE9
26375
230±20 resonant KBO (2:5) · M
2003 FY128
120132
230±10 SDO · M
Huya
38628
229±5 plutino · M
2002 VR128
84719
220±20 plutino · M
2010 TJ ~220 SDO · M
2010 VZ98 ~220 SDO · M
2011 FW62 ~220 other TNO · M
Hygiea
10
215±4 belt asteroid irregular · M
Proteus
Neptune VIII
Proteus (Voyager 2).jpg 210±7 0.44 ~1.3 moon of Neptune irregular · M
2005 QU182
303775
210±40 SDO · M
2004 NT33 210±40 cubewano · M
1999 CD158 ~210 resonant KBO (4:7) · M
2004 PF115
175113
203±43 plutino · M
2011 GM27 ~201 SDO or cubewano? · M
1998 SN165
35671
200±20 cubewano · M
2001 QF298 200±20 plutino · M
2000 YW134
82075
~200 SDO · M
1996 GQ21
26181
~200 SDO · M

From 100 to 200 km[edit]

This list contains a selection of objects between 100 and 200 km in radius (200 and 400 km in diameter). The largest of these may lie above the boundary for hydrostatic equilibrium, but most are irregular. Most of the trans-Neptunian objects listed with a radius smaller than 200 km have "assumed sizes based on a generic albedo of 0.09" since they are too far away to directly measure their sizes with existing instruments. Mass switches from 1021 kg to 1018 kg (Zg). Main-belt asteroids have orbital elements constrained by (2.0 AU < a < 3.2 AU; q > 1.666 AU) according to JPL Solar System Dynamics (JPLSSD).[31] This list is not complete, missing many poorly known TNOs.[13]

Body(a) Image Radius(b)
(km)
Mass
(1018 kg)
Type Remarks – Shape Refs(c)
rad. · Mass
Mimas
Saturn I
Mimas Cassini.jpg 198.2±0.4 37.49±0.03 satellite of Saturn round (smallest known body currently known to have an ellipsoidal
shape, but not in hydrostatic equilibrium)
· M
Vanth
Orcus I
190±50 satellite of Orcus r[20] · M
2010 TY53 ~183 extended centaur · M
Ilmarë
Varda I
180±20 satellite of Varda · M
1996 TL66
15874
170±10 SDO · M
Nereid
Neptune II
Nereid-Voyager2.jpg
170±30 satellite of Neptune irregular shape · M
2004 XA192
230965
170±60 SDO · M
2001 FP185
82158
166±28 SDO · M
Interamnia
704
163±1 37 belt asteroid (F) irregular shape · M
Hiʻiaka
Haumea I
160 20 satellite of Haumea r[32] · M
2002 KX14
119951
159 cubewano · M
Europa
52
158±4 16.5 belt asteroid (C) irregular shape[33] · M
1995 SN55 ~150 Lostcentaur or transient TNO · M
Davida
511
145±10 43.8 belt asteroid (C) irregular shape · M
Sylvia
87
143±5 14.78 belt asteroid (outer) (X); trinary irregular shape[33] · M
Actaea
Salacia I
140±10 satellite of 120347 Salacia · M
Cybele
65
136±6 17.8 outer belt asteroid (C) irregular shape · M
Juno
3
Juno 4 wavelengths.jpg
136±11 26.7 belt asteroid (S) irregular shape[33] r[34] · M
Hyperion
Saturn VII
Hyperion true.jpg
135±4 5.58 satellite of Saturn irregular shape · M
Eunomia
15
134±7 31.2 belt asteroid (S) irregular shape[33] · M
Camilla
107
129±7 11.2 belt asteroid (outer) (C); binary irregular shape[35] · M
Euphrosyne
31
128±3 6.23 belt asteroid (C) irregular shape · M
Psyche
16
127±2 21.9 belt asteroid (M) irregular shape · M
2005 RR43
145453
126 cubewano; Haumea family r[36] · M
Sila
79360
125+15
16
11 cubewano; binary w/ Nunam double classical Kuiper belt object 79360 Sila–Nunam r[22] · M
Chariklo
10199
124±9 centaur possesses rings · M
2007 RW10
309239
124±15 TNO—quasi-satellite of Neptune · M
Nunam
79360
118+14
15
cubewano; binary w/ Sila double classical Kuiper belt object 79360 Sila–Nunam r[22] · M
Bamberga
324
117±4 10 belt asteroid (C) · M
Patientia
451
117±5 belt asteroid irregular shape · M
2001 QC298 117+11
12
11.88±0.14 hot classical; binary [22] · M<
Chiron
2060 or 95P/Chiron
116±7 centaur possesses rings · M
Thisbe
88
113±6 10.5 belt asteroid (B) irregular shape[35] · M
Hektor
624
113±8 10 Jupiter trojan (L4); binary irregular shape · M
Ceto
65489
112±10 5.4 extended centaur; binary · M[37]
Herculina
532
111±2 belt asteroid (S) irregular shape[33] · M
Doris
48
111±4 belt asteroid irregular shape · M
Eugenia
45
107±2 5.69 belt asteroid (F); trinary irregular shape[33] · M
Phoebe
Saturn IX
Phoebe cassini.jpg
106.5±0.7 8.29±0.01 satellite of Saturn formerly round[38] · M
Amphitrite
29
106±3 11.8 belt asteroid (S) irregular shape[33] · M
Bienor
54598
105±15 centaur · M
Deucalion
53311
~105 cubewano · M
Diotima
423
104±3 belt asteroid (C) irregular shape[39] · M
Egeria
13
104±4 16.3 belt asteroid (G) irregular shape · M
Fortuna
19
104±6 12.7 belt asteroid (G) irregular shape · M
Aurora
94
102±2 belt asteroid irregular shape[40] · M
Iris
7
100±5 13.6 belt asteroid (S) irregular shape · M
Daphne
41
100±5 belt asteroid irregular shape · M
Themis
24
100±10 11.3 belt asteroid (C); Themis family · M
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

      Jupiter trojan        moon of Saturn        moon of Neptune        moon of Haumea
      moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune
      belt asteroid—types: B · C · F · G · M · S · X

From 50 to 100 km[edit]

This list contains a selection of objects 50 and 100 km in radius (100 km to 200 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following reference.[13] Asteroid spectral types are mostly Tholen, but some might be SMASS.

Body(a) Image Radius(b)
(km)
Mass
(1018 kg)
Type – Remarks
Alauda
702
97±2 6.05 belt asteroid (C); binary
Larissa
Neptune VII
Larissa 1.jpg
97±3 moon of Neptune
Ursula
375
96±2 belt asteroid
2001 QC298 I 96+9
10
[41]
satellite of 2001 QC298
Hermione
121
121Hermione (Lightcurve Inversion).png 95[42] 5.38 Outer belt asteroid (C); binary
Palma
372
96±2 belt asteroid
Metis
9
95 11.3 belt asteroid
Nemesis
128
92±3 7 belt asteroid (C)
Hebe
6
93 12.8 belt asteroid (S)
Pholus
5145
92±8 6.6 Centaur
Bertha
154
93±1 belt asteroid (C)
Freia
76
92±2 6.5 Outer belt asteroid; Cybele
Elektra
130
91±6 6.6 belt asteroid (G); binary
Rhadamanthus
38083
100.5 ;[13] 1999 HX11; plutino?
Janus
Saturn X
PIA12714 Janus crop.jpg
89.5±1.4 1.912 moon of Saturn
Aletheia
259
95±3 5.97 belt asteroid
Galatea
Neptune VI
Galatea moon.jpg
88±4 2.12 moon of Neptune
Teharonhiawako
88611
89+16
18
;[22] Trans-Neptunian object; cubewano; primary of Sawiskera
Typhon
42355
81±4 Trans-Neptunian object; binary
Lachesis
120
87 5.5 belt asteroid
Winchester
747
85±3 belt asteroid
Hilda
153
85 5.2 belt asteroid; Hildas
Namaka
Haumea II
~85 2 moon of Haumea
Puck
Uranus XV
Puck.png
81±2[43] moon of Uranus
Aegle
96
84±3 5.1 belt asteroid
Germania
241
89±4 5.05 belt asteroid (C)
Prokne
194
85±3 5 belt asteroid (C)
Stereoskopia
566
84[44] Outer belt asteroid; Cybele
Amalthea
Jupiter V
Amalthea (moon).png
84±2 2.08±0.15 moon of Jupiter
Agamemnon
911
83 Jupiter trojan
Kalliope
22
90±2 8.09 belt asteroid (M); binary
Borasisi
66652
81.5+16
33
[22] trans-Neptunian object; cubewano; binary
Siegena
386
85±4 belt asteroid (C)
Elpis
59
82±3 belt asteroid
Diomedes
1437
82±2 4.6 Jupiter trojan
Gyptis
444
82±5 12.5 belt asteroid (C)
Aspasia
409
88±2 4.42 belt asteroid (C)
Dioretsa
20461
14±3 [45] centaur;[46] damocloid
Dido
209
70±5 4.28 belt asteroid (C)
Chicago
334
84±4 belt asteroid (C)
Hispania
804
74±2 9.95 belt asteroid (P)
Eunike
185
80±3 4.09 belt asteroid
Juewa
139
81±4 4 belt asteroid
Io
85
80 3.4 belt asteroid
Loreley
165
82±4 3.91 belt asteroid (C)
Pretoria
790
80.49[36] Outer belt asteroid; Cybele
Ino
173
80±3 belt asteroid (C)
Altjira
148780
123+19
70
[22] trans-Neptunian object; cubewano; binary; secondary S/2007 (148780) 1
Eleonora
354
77±3 belt asteroid (S)
Laetitia
39
76.9[36] 3.5 belt asteroid
Irene
14
76 8.2 belt asteroid
Julia
89
74±4 3.6 belt asteroid (S)
Merapi
536
76±2 belt asteroid
Berbericia
776
76±2 belt asteroid
Adeona
145
75±3 3.6 belt asteroid; Adena
Nuwa
150
73±5 3.62 belt asteroid (C)
Despina
Neptune V
Despina.jpg
75±3 moon of Neptune
Sycorax
Uranus XVII
~75 2.3 moon of Uranus
Manwë
385446
~75 Resonant KBO (4:7)
Pales
49
74.9[47] 2.69 belt asteroid (C)
S/2007 (148780) 1
Altjira I
111+17
63
trans-Neptunian object; cubewano; binary ;[22] Secondary of 148780 Altjira
Lomia
117
~70 3.4 belt asteroid (C)
Hypatia
238
~70 belt asteroid (C)
Sibylla
168
~70 3.42 belt asteroid (C)
Emma
283
~70 1.38 belt asteroid; binary
Nemausa
51
~70 belt asteroid
Dione
106
~70 belt asteroid (G)
Meliboea
137
~70 3.2 belt asteroid
Massalia
20
~70 5.67 belt asteroid
Isolda
211
~70 3.07 belt asteroid (C)
Äneas
1172
~70 Jupiter trojan
Vibilia
144
~70 3 belt asteroid
Princetonia
508
~70 belt asteroid
Helio
895
~70 belt asteroid (B)
Bononia
361
~70 belt asteroid (D)
Bertholda
420
~70 belt asteroid (P)
Minerva
93
~70 2.9 belt asteroid (C); trinary
Patroclus
617
~70 Jupiter trojan; binary
Polyxo
308
~70 belt asteroid (T)
Melpomene
18
~70 3 belt asteroid
Adorea
268
~70 belt asteroid
Dembowska
349
~70 belt asteroid (R)
Comacina
489
~70 belt asteroid
Hesperia
69
~70 2.76 belt asteroid (M)
Alexandra
54
~70 belt asteroid
Pulcova
762
~70 belt asteroid (C); binary
Pabu
Borasisi I
~70 Secondary of 66652 Borasisi
Philomela
196
~70 belt asteroid (S)
Medea
212
~70 2.64 belt asteroid
Arethusa
95
~70 2.6 belt asteroid
Portia
Uranus XII
68±4 1.7 moon of Uranus
Achilles
588
~70 Jupiter trojan
Wratislavia
690
~70 belt asteroid
Ate
111
~70 belt asteroid (C)
Eukrate
247
~70 belt asteroid (C)
Erminia
705
~70 belt asteroid
Papagena
471
~70 belt asteroid (C)
Phorcys
<Ceto I
86±5 1.67[37] Satellite of 65489 Ceto
Protogeneia
147
~70 2.5 belt asteroid
Menoetius
Patroclus I
~70 Secondary of 617 Patroclus
Desiderata
344
~70 belt asteroid (C)
Lucina
146
~70 2.4 belt asteroid
Lumen
141
~70 1.6 belt asteroid (C)
Liguria
356
~70 belt asteroid
Parthenope
11
~70 6.15 belt asteroid
Lamberta
187
~70 2.37 belt asteroid (C)
Himalia
Jupiter VI
Cassini-Huygens Image of Himalia.png
67±10[48] 4.19[49] moon of Jupiter—Himalia group
Aurelia
419
~60 belt asteroid (F)
Dynamene
200
~60 belt asteroid
Flora
8
8Flora (Lightcurve Inversion).png ~60 8.47 belt asteroid (S); Flora
Boliviana
712
~60 belt asteroid (X)
Zelinda
654
~60 belt asteroid
Hippo
426
~60 belt asteroid
Aglaja
47
~60 belt asteroid (C)
Thule
279
~60 belt asteroid (D)
Undina
92
~60 2.1 belt asteroid (M)
Anchises
1173
~60 Jupiter trojan
Odysseus
1143
~60 Jupiter trojan (L4)
Argentina
469
~60 belt asteroid; Cybele
Aemilia
159
~60 1.4 belt asteroid
Thia
405
~60 belt asteroid (C)
Marianna
602
~60 belt asteroid
Hestia
46
~60 3.5[50]–21[51] belt asteroid
Kleopatra
216
Kleopatra.jpg ~60 belt asteroid (M); trinary
Klymene
104
~60 2 belt asteroid
Chloris
410
~60 belt asteroid (C)
Sophrosyne
134
~60 2 belt asteroid
Gudrun
328
~60 1.94 belt asteroid (S)
Deiphobus
1867
~60 Jupiter trojan
Leto
68
~60 belt asteroid (S)
Panopaea
70
~60 belt asteroid (C)
Sawiskera
Teharonhiawako I
65+12
13
;[22] Secondary of 88611 Teharonhiawako
Johanna
127
~60 belt asteroid
Adelheid
276
~60 belt asteroid
Iduna
176
~60 belt asteroid (G)
Xanthippe
156
~60 belt asteroid (S)
Bellona
28
~60 belt asteroid (C)
Semele
86
~60 belt asteroid (C)
Diana
78
~60 belt asteroid (C)
Myrrha
381
~60 belt asteroid (C)
Henrietta
225
~60 1.83 belt asteroid (C); Cybele
Elfriede
618
~60 belt asteroid (C)
Artemis
105
~60 1.8 belt asteroid (C)
Terpsichore
81
~60 belt asteroid (C)
Astraea
5
~60 2.9 belt asteroid
Galatea
74
~60 1.8 belt asteroid (C)
Ornamenta
350
~60 belt asteroid (C)
Tanete
772
~60 belt asteroid (C)
Hedwig
476
~60 belt asteroid
Freda
1093
~60 belt asteroid
Ophelia
171
~60 belt asteroid (C); Themis
Ulla
909
~60 belt asteroid
Paris
3317
~60 Jupiter trojan
Pompeja
203
~60 belt asteroid
Makhaon
3063
~60 1.6 Jupiter trojan
2006 SQ372
308933
~60 TNO
Leda
38
~60 1.6 belt asteroid
Carlova
360
~60 belt asteroid
Brixia
521
~60 belt asteroid
Veritas
490
~60 belt asteroid; Veritas
Tisiphone
466
~60 belt asteroid (C)
Kalypso
53
~60 belt asteroid
Alcathous
2241
~60 Jupiter trojan
Charybdis
388
~60 belt asteroid (C)
Circe
34
~60 1.5 belt asteroid (C)
Epimetheus
Saturn XI
PIA09813 Epimetheus S. polar region.jpg
58±2 0.5304[52] moon of Saturn
Scheila
596
~60 belt asteroid
Melete
56
~60 1.5 belt asteroid
Antigone
129
~60 2 belt asteroid; nickel–iron
Victoria
12
~60 belt asteroid (S)
Mnemosyne
57
~60 belt asteroid
Messalina
545
~60 belt asteroid
Teucer
2797
~60 Jupiter trojan (L4)
Automedon
2920
~60 Jupiter trojan (L4)
Aegina
91
~50 1.4 belt asteroid (C)
Siwa
140
~50 1.4 belt asteroid
Tauris
814
~50 belt asteroid
Polyxena
595
~50 belt asteroid
Athamantis
230
~50 belt asteroid (S)
Nestor
659
~50 Jupiter trojan
Fides
37
~50 1.3 belt asteroid (S)
Armida
514
~50 belt asteroid
Thalia
23
~50 1.3 belt asteroid (S)
Mandeville
739
~50 belt asteroid (X)
Harmonia
40
~50 1.3 belt asteroid (S)
Eucharis
181
~50 1.2 belt asteroid (K)
Hermentaria
346
~50 belt asteroid (S)
Ninina
357
~50 belt asteroid
Marion
506
~50 belt asteroid (C)
Corduba
365
~50 belt asteroid (C)
Atalante
36
~50 belt asteroid
Luscinia
713
~50 belt asteroid (C)
Rollandia
1269
~50 belt asteroid
Eva
164
~50 belt asteroid (C)
Ianthe
98
~50 1.2 belt asteroid (C)
Vanadis
240
~50 belt asteroid (C)
Eos
221
~50 belt asteroid (K)
Hohensteina
788
~50 belt asteroid
Ani
791
~50 belt asteroid
Troilus
1208
~50 Jupiter trojan
Nausikaa
192
~50 belt asteroid (S)
Ausonia
63
~50 1.1 belt asteroid (S)
Leukothea
35
~50 1.1 belt asteroid (C)
Kythera
570
~50 belt asteroid
Asterope
233
~50 belt asteroid (T)
Euforbo
4063
~50 Jupiter trojan
Antilochus
1583
~50 Jupiter trojan
Abastumani
1390
~50 belt asteroid
Helga
522
~50 belt asteroid; Cybele
Andromache
175
~50 belt asteroid (C)
Kolga
191
~50 1.08 belt asteroid (C)
Gerlinde
663
~50 belt asteroid
Notburga
626
~50 belt asteroid
Aquitania
387
~50 belt asteroid (S)
Isis
42
~50 belt asteroid (S)
Urania
30
~50 belt asteroid (S)
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties

Legend:

      Jupiter trojan        moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune        moon of Haumea
      belt asteroid—types: C · D · F · G · K · M · P · R · S · T · X

From 20 to 50 km[edit]

This list contains a few examples because there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 50 km.[53] Many thousands of objects of this size range have yet to be discovered in the Trans-Neptunian region. The number of digits is not an endorsement of significant figures. The table switches from ×1018 kg to ×1015 kg (Eg), and many of these mass values are assumed. (See list of minor planets.)

Body(a) Image Radius(b)
(km)
Mass
(1015 kg)
Type – Notes Refs(c)
rad. · Mass
21 Lutetia
Rosetta triumphs at asteroid Lutetia.jpg
~50 1700 belt asteroid (M) · M[54]
50 Virginia ~50 asteroid · M
114 Kassandra ~50 1000 belt asteroid (T) · M
1021 Flammario ~50 asteroid · M
162 Laurentia ~50 belt asteroid · M
401 Ottilia ~50 belt asteroid · M
Thebe
Jupiter XIV
Thebe.jpg
~50 moon of Jupiter · M
148 Gallia ~50 980 belt asteroid (R) · M
404 Arsinoe ~50 belt asteroid (C) · M
27 Euterpe ~50 belt asteroid (S) · M
773 Irmintraud ~50 asteroid (D) · M
62 Erato ~50 910 belt asteroid; Themis · M
26 Proserpina ~45 900 asteroid · M
345 Tercidina ~45 belt asteroid (C) · M
Juliet
Uranus XI
~45 moon of Uranus · M
58 Concordia ~45 850 asteroid · M
229 Adelinda ~45 belt asteroid (C) · M
379 Huenna ~45 480 belt asteroid (C) · M
103 Hera ~45 790 asteroid · M
17 Thetis ~45 1200 asteroid · M
143 Adria ~45 760 belt asteroid · M
109 Felicitas ~45 750 asteroid · M
100 Hekate ~45 1000 asteroid · M
90 Antiope A ~45 410 asteroid (C); binary · M
227 Philosophia ~45 belt asteroid · M
Prometheus
Saturn XVI
Prometheus 12-26-09a.jpg
~45 156.6 moon of Saturn · M
110 Lydia ~45 670 asteroid · M
Elara
Jupiter VII
~45 moon of Jupiter; Himalia group · M
72 Feronia ~45 670 asteroid · M
Echidna
Typhon I
44±3 satellite of 42355 Typhon · M
Thorondor
Manwë I
~40 satellite of Manwë · M
60558 Echeclus
174P/Echeclus
~40 centaur[55] · M
S/2000 (90) 1 ~40 asteroid moon of 90 Antiope · M
71 Niobe ~40 610 asteroid · M
102 Miriam ~40 asteroid · M
97 Klotho ~40 590 asteroid · M
61 Danae ~40 asteroid · M
Thalassa
Neptune IV
~40 moon of Neptune · M
122 Gerda ~40 570 belt asteroid (S) · M
Pandora
Saturn XVII
Pandora PIA07632.jpg
~40 135.6 moon of Saturn · M
83 Beatrix ~40 560 belt asteroid (X) · M
32 Pomona ~40 asteroid · M
Belinda
Uranus XIV
Belinda.gif
~40 moon of Uranus · M
115 Thyra ~40 asteroid · M
Cressida
Uranus IX
~40 moon of Uranus · M
135 Hertha ~40 asteroid · M
84 Klio ~40 520 asteroid · M
80 Sappho ~40 asteroid · M
1001 Gaussia ~40 asteroid · M
58534 Logos ~40 270 Kuiper belt object; cubewano; binary · M
124 Alkeste ~40 470 belt asteroid (S) · M
55576 Amycus ~40 centaur · M
25 Phocaea ~40 asteroid · M
Weywot
Quaoar I
~35 satellite of Quaoar · M
8405 Asbolus ~35 centaur · M
112 Iphigenia ~35 asteroid · M
Rosalind
Uranus XIII
~35 250 moon of Uranus · M
Caliban
Uranus XVI
~35 moon of Uranus · M
99 Dike ~35 390 asteroid · M
66 Maja ~35 asteroid · M
116 Sirona ~35 belt asteroid · M
44 Nysa ~35 370 belt asteroid (E) · M
10370 Hylonome ~35 centaur · M
77 Frigga ~35 350 asteroid · M
55 Pandora ~35 asteroid · M
133 Cyrene ~35 310 belt asteroid (S) · M
79 Eurynome ~35 asteroid · M
Zoe
Logos I
~35 satellite of 58534 Logos · M
Naiad
Neptune III
Naiad Voyager.png
~35 moon of Neptune · M
43 Ariadne ~35 asteroid · M
101 Helena ~35 300 asteroid · M
108 Hecuba ~30 390 asteroid · M
Desdemona
Uranus X
~30 moon of Uranus · M
Halimede
Neptune IX
~30 moon of Neptune · M
52975 Cyllarus ~30 centaur · M
82 Alkmene ~30 asteroid · M
60 Echo ~30 asteroid · M
Crantor
83982
~30 centaur · M
Comet Hale–Bopp
C/1995 O1
Hale-bopp.jpg
~30 comet · M
Pasiphae
Jupiter VIII
~30 moon of Jupiter · M
7066 Nessus ~30 centaur · M
Neso
Neptune XIII
~30 moon of Neptune · M
64 Angelina ~30 belt asteroid (E) · M
67 Asia ~30 asteroid · M
119 Althaea ~30 200 belt asteroid (S) · M
75 Eurydike ~30 180 belt asteroid (M) · M
142 Polana ~30 180 belt asteroid (F) · M
253 Mathilde
(253) mathilde crop.jpg
26.4 103.3 belt asteroid (C) · M
52872 Okyrhoe ~25 centaur · M
Bianca
Uranus VIII
~25 92 moon of Uranus · M
Prospero
Uranus XVIII
~25 85 moon of Uranus · M
Setebos
Uranus XIX
~25 75 moon of Uranus · M
123 Brunhild ~25 belt asteroid · M
4348 Poulydamas ~25 asteroid; Jupiter Trojan · M
1000 Piazzia ~25 belt asteroid · M
113 Amalthea ~25 100 belt asteroid · M
Carme
Jupiter XI
~25 130 moon of Jupiter; Carme group · M
138 Tolosa ~25 99 belt asteroid (S) · M
126 Velleda ~20 94 belt asteroid · M
73 Klytia ~20 92 asteroid · M
Sao
Neptune XI
~20 moon of Neptune · M
125 Liberatrix ~20 87 belt asteroid (M) · M
Metis
Jupiter XVI
Metis.jpg
~20 36 moon of Jupiter · M
132 Aethra ~20 82 belt asteroid (M) · M
Ophelia
Uranus VII
~20 53 moon of Uranus · M
Laomedeia
Neptune XII
~20 moon of Neptune · M
118 Peitho ~20 76 belt asteroid · M
208 Lacrimosa ~20 73.9 belt asteroid (S) Koronis · M
136 Austria ~20 68 belt asteroid (M) · M
131 Vala ~20 69 belt asteroid · M
Cordelia
Uranus VI
~20 44 moon of Uranus · M
Siarnaq
Saturn XXIX
~20 moon of Saturn · M
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

      moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune
      belt asteroid—types: C · D · E · F · M · R · S · T · X

From 1 to 20 km[edit]

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

Body(a) Image Radius(b)
(km)
Mass
(1015 kg)
Type – Notes Refs(c)
rad. · Mass
167 Urda ~20 66.7 belt asteroid; Koronis; S-type · M
Sinope
Jupiter IX
~20 76 moon of Jupiter · M
Psamathe
Neptune X
~20 37 moon of Neptune · M
29P/Schwassmann–
Wachmann
29P Schwassmann Wachmann.jpg ~20 comet; centaur · M
Lysithea
Jupiter X
~20 63 moon of Jupiter; Himalia group · M
158 Koronis ~20 belt asteroidKoronisS-type · M
Hidalgo
944
19 centaur, first to be discovered in 1920; historically called asteroid. Source radius:[56] · M
Hydra
Pluto III
Hydra imaged by LORRI from 231 000 kilometres.jpg
19 moon of Pluto r[57] · M
Helene
Saturn XII, Dione B
Helene over Saturn.jpg
17.6±0.4 25 moon of Saturn; Dione trojan r[58] · M
Nix
Pluto II
Nix viewed from New Horizons 2015-07-14.jpg
17.5 moon of Pluto r[59] · M
243 Ida
243 Ida large.jpg
15.7 42 belt asteroidKoronisS-typebinary r[60] · M
1655 Comas Solà 15.3±1.1 belt asteroidB-type r[61] · M
Atlas
Saturn XV
Cassini Atlas N00084634 CL.png
15.1±0.9 66 moon of Saturn r[58] · M
226 Weringia ~15 belt asteroidS-type · M
433 Eros
WholeEros.jpg
~15 66.9 Amor/near-Earth asteroid · M
Stephano
Uranus XX
~15 22 moon of Uranus · M
Albiorix
Saturn XXVI
~15 moon of Saturn · M
1036 Ganymed ~15 33 near-Earth asteroid · M
1815 Beethoven ~15 belt asteroid · M
31824 Elatus ~15 centaur · M
Perdita
Uranus XXV
~15 13 moon of Uranus · M
Linus
Kalliope I
~15 60 asteroid moon of 22 Kalliope · M[62]
Ananke
Jupiter XII
~15 38.2 moon of Jupiter · M
Pan
Saturn XVIII
Pan side view.jpg
14.1±1.3 4.95 moon of Saturn r[63] · M[64]
Phobos
Mars I
Phobos colour 2008.jpg
11.267 10.7 moon of Mars · M
Telesto
Saturn XIII or Tethys B
Telesto cassini closeup.jpg
~10 moon of Saturn Tethys trojan · M
Paaliaq
Saturn XX
~10 8.2 moon of Saturn · M
Francisco
Uranus XXII
~10 7.2 moon of Uranus · M
Calypso
Saturn XIV or Tethys C
N00151485 Calypso crop.jpg
~10 moons of Saturn; Tethys trojan · M
Leda
Jupiter XIII
~10 11 moon of Jupiter; Himalia group · M
Ferdinand
Uranus XXIV
~10 5.4 moon of Uranus · M
Margaret
Uranus XXIII
~10 5.4 moon of Uranus · M
149 Medusa ~10 8 belt asteroid · M
Romulus
Sylvia I
~10 4 asteroid moon of 87 Sylvia · M
Ymir
Saturn XIX
~10 moon of Saturn · M
Trinculo
Uranus XXI
~10 3.9 moon of Uranus · M
Cupid
Uranus XXVII
~10 3.8 moon of Uranus · M
S/2004 N 1 ~10 moon of Neptune · M
2002 Euler ~10 5.5 asteroid · M
Adrastea
Jupiter XV
Adrastea.jpg
~10 2 moon of Jupiter · M
Kiviuq
Saturn XXIV
~10 moon of Saturn · M
2000 Herschel ~10 belt asteroid[65] · M
Tarvos
Saturn XXI
Tarvos from Cassini.jpg ~10 moon of Saturn · M
S/2006 (624) 1
Hektor I
~10 asteroid moon of 624 Hektor · M
Kerberos
Pluto IV
~10 moon of Pluto · M
2685 Masursky
Asteroid 2685Masurky.gif
~10 5–11 asteroid · M
Styx
Pluto V
~10 moon of Pluto · M
951 Gaspra
951 Gaspra.jpg
6.1±0.4 2–3 asteroid r[66] · M
(65407) 2002 RP120 ~5 3.1 Damocloid (retrograde) & possible ejected SDO · M
Bestla
Saturn XXXIX
~5 moon of Saturn · M
Petit-Prince
Eugenia I
~5 1.2 asteroid moon of 45 Eugenia · M
Deimos
Mars II
Deimos-MRO.jpg
~5 1.48 moon of Mars · M
Ijiraq
Saturn XXII
~5 moon of Saturn · M
S/2002 (121) 1
Hermione I
~5 1.6 asteroid moon of 121 Hermione · M
Halley's Comet
Lspn comet halley.jpg
~5 0.03 comet · M[67]
S/2001 (107) 1
Camilla I
~5 1.5 asteroid moon of 107 Camilla · M
Mab
Uranus XXVI
~5 moon of Uranus · M
Erriapus
Saturn XXVIII
~5 moon of Saturn · M
26858 Misterrogers ~5 asteroid · M
Callirrhoe
Jupiter XVII
~5 moon of Jupiter · M
Themisto
Jupiter XVIII
~5 0.69 moon of Jupiter · M
Remus
Sylvia II
~5 0.2 asteroid moon of 87 Sylvia · M
S/2003 (379) 1
Huenna I
~5 asteroid moon of 379 Huenna · M
S/2003 (130) 1
Elektra I
~5 0.4 asteroid moon of 130 Elektra · M
S/2004 (45) 1
Eugenia II
~5 asteroid moon of 45 Eugenia · M
118401 LINEAR ~5 0.23 main-belt comet · M
4179 Toutatis
Toutatis.jpg
~5 0.05 near-Earth asteroid · M
3200 Phaethon ~5 0.14 Apollo asteroid; B-type · M
2P/Encke
Comet Encke.jpg
<5 comet · M
C/1996 B2
Comet Hyakutake
Hyakutake Hubble.gif
<5 comet[68] · M
81P/Wild
Wild 2
Wild2 3.jpg
<5 comet · M
Pallene
Saturn XXXIII
N00163156.jpg
<5 0.043 moon of Saturn · M
Polydeuces
Saturn XXXIV or Dione C
Polydeuces.jpg
<5 0.03 moon of Saturn; Dione trojan · M
17P/Holmes
17pHolmes 071104 eder vga.jpg
<5 comet · M
5535 Annefrank
Asteroid 5535 Annefrank.jpg
<5 asteroid · M
3753 Cruithne <5 0.13 asteroid & quasi-satellite of Earth · M
(285263) 1998 QE2
(285263) 1998 QE2, Goldstone, May 30, 2013.jpg
<5 near-Earth asteroid—Binary · M
4055 Magellan
CCD image of asteroid 4055 Magellan.png
<5 Amor asteroid; V-type · M
9969 Braille
PIA01345.jpg
<5 asteroid · M
132524 APL
Asteroid 2002 JF56.jpg
<5 asteroid · M
(6178) 1986 DA <5 0.002 amor asteroid; M-type · M
Comet Comas Solà 4.2 Jupiter-family comet r[69] · M
Daphnis
Saturn XXXV
Daphnis raw 2010 cropped.jpg
3.9±0.8 0.084 moon of Saturn · M[64]
9P/Tempel
PIA02127.jpg
2.8 0.075 comet r[70] · M
2867 Šteins
Steins.png
2.65 asteroidE-type r[71] · M
19P/Borrelly
Comet Borrelly Nucleus.jpg
2.4 comet (Jupiter family) r[72] · M
Comet Churyumov–Gerasimenko
Comet 67P on 19 September 2014 NavCam mosaic.jpg
1.9 comet · M
(53319) 1999 JM8
Asteroid 1999 JM8.gif
1.75 asteroid r[73] · M
Methone
Saturn XXXII
Methone PIA14633.jpg
1.6±0.6 0.019 moon of Saturn · M
Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

      moon of Mars        moon of Jupiter        moon of Saturn        moon of Uranus        moon of Neptune        moon of Pluto

Below 1 km[edit]

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

In the asteroid belt alone there are estimated to be between 1.1 and 1.9 million objects with a radius above 0.5 km,[74] many of which are in the range 0.5–1.0 km. Countless more have a radius below 0.5 km.

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

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

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

Body(a) Image Radius(b)
(m)
Mass
(1012 kg)
Type – Notes Refs(c)
rad. · Mass
1620 Geographos
Geographos.jpg
885 4 NEA; Apollo r[75] · M
1862 Apollo 850 5.1 NEA; Apollo; Q-type · M
(214869) 2007 PA8 ~800 NEA; Apollo r[76] · M
100000 Astronautica ~800 Inner belt asteroid[77] r[78] · M
Dactyl
Ida I
Dactyl-HiRes.jpg 700 Moon of 243 Ida · M
1566 Icarus 700 2.9 NEA; Apollo; U-type · M
4769 Castalia 700 1.3 NEA; Apollo r[79] · M
(137108) 1999 AN10 650 NEA; Apollo · M
(29075) 1950 DA
1950da color 150.jpg
600 3 NEA; Apollo · M
(66391) 1999 KW4
1999 KW4 animated.gif
600 2.33 Mercury-crosser asteroid; Aten · M
46P/Wirtanen 600 Comet · M
103P/Hartley
Hartley 2
495296main epoxi-1-full full.jpg 570±80 0.3 Comet · M[80]
3908 Nyx 520 5 Near-Earth asteroid; Amor; V-type · M
14827 Hypnos 450 Comet; dormant comet[81] r[82] · M
2062 Aten 450 0.76 Near-Earth asteroid; Aten r[83] · M
2007 CA19 432 1.2 NEA; Apollo · M
6489 Golevka 350 NEA; Apollo r[84] · M
25143 Itokawa 346 0.0358 NEA; Apollo · M
2004 XP14 300 NEA; Apollo · M
(144898) 2004 VD17 290 3 NEA; Apollo · M[85]
Aegaeon
Saturn LIII
Aegaeon (2008 S1).jpg
250 moon of Saturn · M
2005 YU55
308635
2005YU55-20111107.jpg
180 Near-Earth asteroid;[86] Apollo; PHO[87] r[88] · M
4660 Nereus
Nereus.jpg
165 NEA; Apollo r[89] · M
(357439) 2004 BL86 162.5 NEA; Apollobinary · M
99942 Apophis 2004MN4 Sormano.gif 162.5 0.05 Near-Earth asteroid; Aten; PHO r[90] · M[85]
S/2009 S 1
PIA11665 moonlet in B Ring cropped.jpg
150 moon of Saturn · M
2010 TK7 150 Earth trojan; Apollo · M
2007 TU24
2007 TU24 radar image 20080128.jpg
125 Near-Earth asteroid; Apollo; PHO r[91] · M
2002 JE9 100 NEA; Apollo; PHO · M
2010 XC15 100 NEA; Apollo; PHO · M
1994 WR12 65 0.002 Near-Earth asteroid; Aten r[92]  · M[85]
2009 FD
410777
65 0.0028 NEA; Apollo r[93] · M[93]
2008 HJ 18 0.000005 Near-Earth asteroid & fast rotator (42 s)[94] r[94] · M[94]
367943 Duende
2012 DA14
Radar-2012DA14-Goldstone.jpg 15 NEA · M
1998 KY26 Asteroid 1998 KY26.faces model.jpg 15 NEA & fast rotator (10 m) r[95]

 · M

Notes:
(a) Name of body, including alternative names using roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

      moon of Jupiter        moon of Saturn
NEA: near-Earth asteroid,

Surface gravity[edit]

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

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

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

where

ag is the magnitude of the gravitational acceleration
G is the gravitational constant
m is the mass of the celestial body
r is the equatorial radius of the celestial body (if this varies significantly, the mean equatorial radius is used)

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

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

where

T is the rotation period of the celestial body

The surface gravity at the equator is then given by

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

Notes[edit]

Using equatorial radius and assuming body is spherical
Using three radii and assuming body is spheroid
* Radius is known only very approximately
R Radius has been determined by various methods, such as optical (Hubble), thermal (Spitzer), or direct imaging via spacecraft
9 Unknown radius, generic assumed albedo of 0.09
$ Well studied asteroid or moon whose dimensions and mass are very well known. Asteroid sizes and masses taken from James Baer's (Bio) personal website.
M Mass has been determined by perturbation. For asteroids, see James Baer's personal website.
Note: For many of the well-determined moons, radii were taken from the JPL Solar System Dynamics page.
O Radius has been determined by an occultation

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Further reading[edit]

External links[edit]