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List of Solar System objects by size

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

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

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

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

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

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

There can be difficulty in determining the diameter (within a factor of about 2) for typical objects beyond Saturn. (See 2060 Chiron as an example.) For TNOs there is some confidence in the diameters, but for non-binary TNOs there is no real confidence in the masses/densities. Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm3, but it is just as likely that they have a comet-like density of only 0.5 g/cm3.[2] For example, if a TNO is poorly assumed to have a mass of 3.59×1020 kg based on a radius of 350 km with a density of 2 g/cm3 and is later discovered to only have a radius of 175 km with a density of 1 g/cm3, the mass estimate would be only 2.24×1019 kg.

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

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

Contents

Graphical overviewEdit

 
Relative sizes of the fifty largest bodies in the Solar System, colored by orbital region.
Values are diameters in kilometers. Scale is logarithmic.

List of objects by radiusEdit

Larger than 400 kmEdit

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

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

Body(a) Image Radius(b) Volume Mass Density Gravity(c) Type Shape #(d)
(km) (R) (109 km3) (V) (1021 kg) (M) (g/cm3) (m/s2) ()
Sun 696342±65[9] 109.3 1,414,300,000 1,305,700 1,988,550,000 333,000 1.408 274.0 27.94 star round (HE) 1
Jupiter 69911±6 10.97 1,431,280 1,321 1,898,600 317.83 1.326 24.79 2.528 planet (gas giant); has rings round (HE) 2
Saturn 58232±6
(w/o rings)
9.140 827,130 764 568,460 95.162 0.687 10.445 1.065 planet (gas giant); has rings round (HE) 3
Uranus 25362±7 3.981 68,340 63.1 86,832 14.536 1.27 8.69 0.90 planet (ice giant); has rings round (HE) 4
Neptune 24622±19 3.865 62,540 57.7 102,430 17.147 1.638 11.15 1.137 planet (ice giant); has rings round (HE) 5
Earth 6371.0±0.01 1 1,083.21 1 5,973.6 1 5.514 9.80665 1 planet (terrestrial) round (HE) 6
Venus 6051.8±1.0
(w/o gas)
0.9499 928.43 0.857 4,868.5 0.815 5.243 8.872 0.905 planet (terrestrial) round (HE) 7
Mars 3389.5±0.2 0.5320 163.18 0.151 641.85 0.107 3.9335 ± 0.0004 3.7 0.38 planet (terrestrial) round (HE) 8
Ganymede
Jupiter III
2634.1±0.3 0.4135 76.30 0.0704 148.2 0.0248 1.936 1.428 0.15 moon of Jupiter round (HE) 9
Titan
Saturn VI
2574.73±0.09
(w/o gas)
0.4037 71.50 0.0658 134.5 0.0225 1.8798 ± 0.0044 1.354 0.14 moon of Saturn round (HE) 10
Mercury 2439.7±1.0 0.3829 60.83 0.0562 330.2 0.0553 5.427 3.7 0.38 planet (terrestrial) round (HE) 11
Callisto
Jupiter IV
2410.3±1.5 0.3783 58.65 0.0541 107.6 0.018 1.8344 ± 0.0034 1.23603 0.126 moon of Jupiter round (HE) 12
Io
Jupiter I
1821.6±0.5 0.2859 25.32 0.0234 89.3 0.015 3.528 ± 0.006 1.797 0.183 moon of Jupiter round (HE) 13
Moon
Earth I
1737.1 0.2727 21.958 0.0203 73.5 0.0123 3.3464 1.625 0.166 moon of Earth round (HE) 14
Europa
Jupiter II
1560.8±0.5 0.2450 15.93 0.0147 48 0.008035 3.013 ± 0.005 1.316 0.134 moon of Jupiter round (HE) 15
Triton
Neptune I
1353.4±0.9 0.2124 10.38 0.0096 21.5 0.003599 2.061 0.782 0.0797 moon of Neptune round (HE) 16
Pluto
134340
1188.3±1.6[10] 0.186 6.95 0.0064 13.105 0.0022 1.87 ± 0.02 0.61 0.062 dwarf planet; plutino; multiple round (HE) 17
Eris
136199
1163±6[11] 0.1825 6.59 0.006 16.7[12] 0.0028 2.52 ± 0.05 0.659 0.0672 dwarf planet; SDO; binary round (HE) 18
Haumea
136108
816[13] 0.097 1.3–1.6 0.001 4.006 0.00067 2.55[14] 0.44 0.045 dwarf planet; resonant KBO (7:12); trinary; has rings round (scalene ellipsoid) 19
Titania
Uranus III
788.4±0.6 0.1237 2.06 0.0019 3.526 0.00059 1.711 ± 0.005 0.378 0.0385 moon of Uranus round 20
Rhea
Saturn V
763.8±1.0 0.1199 1.87 0.0017 2.3166 0.00039 1.236 ± 0.005 0.26 0.027 moon of Saturn round (HE, disputed) 21
Oberon
Uranus IV
761.4±2.6 0.1195 1.85 0.0017 3.014 0.0005 1.63 ± 0.05 0.347 0.035 moon of Uranus round 22
Iapetus
Saturn VIII
734.5±2.8 0.1153 1.55 0.0014 1.9739 0.00033 1.088 ± 0.013 0.223 0.0227 moon of Saturn round (not in HE) 23
Makemake
136472
715+19
−11
[15]
0.112 1.7 0.0016 4.4 0.0007367 2.3±0.9 dwarf planet; cubewano round 24
2007 OR10
225088
626±43[16] 0.0983 1.03 0.0009 1.75 0.00029 1.72±0.16 resonant KBO (3:10) unknown 25
Charon
Pluto I
606±3 0.0951 0.87 0.0008 1.52 0.00025 1.702 ± 0.021 0.279 0.028 moon of Pluto round 26
Umbriel
Uranus II
584.7±2.8 0.0918 0.84 0.0008 1.2 0.00020 1.39 ± 0.16 0.234 0.024 moon of Uranus round 27
Ariel
Uranus I
578.9±0.6 0.0909 0.81 0.0007 1.35 0.000226 1.66 ± 0.15 0.269 0.027 moon of Uranus round 28
Dione
Saturn IV
561.4±0.4 0.0881 0.73 0.0007 1.096 0.000183 1.478 ± 0.003 0.232 0.0237 moon of Saturn round (not in HE) 29
Quaoar
50000
555±2.5 0.0871 1.4 ± 0.1 0.0002 2.2 ± 0.4[17] 0.125 0.0127 cubewano; binary unknown 30
Tethys
Saturn III
531.1±0.6 0.0834 0.624 0.0006 0.6173 0.000103 0.984 ± 0.003[18] 0.145 0.015 moon of Saturn round (not in HE) 31
Sedna
90377
497.5±40 0.0785 sednoid; detached object unknown 32
Ceres
1
473[19] 0.0742 0.433 0.0004 0.939[20] 0.000157 2.17 0.29 0.030 dwarf planet; belt asteroid round (HE) 33
2002 MS4
307261
467±24 0.0733 cubewano[21] unknown 34
Orcus
90482
458±13 0.0719 0.641 ± 0.19 2.47[22] 0.18 plutino; binary unknown 35
Salacia
120347
425±23 0.0667 0.438 ± 0.16 1.16+0.59
−0.36
[23]
cubewano; binary unknown 36
Notes:
(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Jupiter I" for Io), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Given as surface gravity (1 bar for gaseous planets)
(d) Ranking by radius of the largest bodies in the Solar System, may not reflect the latest updates of measured radii
  star    giant planet    terrestrial planet    the Moon, moon of Earth    moon of Jupiter    moon of Saturn    moon of Uranus    moon of Neptune    moon of Pluto

From 200 to 399 kmEdit

All imaged icy moons except Proteus with radii greater than 200 km are round, although those under 400 km that have had their shapes carefully measured are not in hydrostatic equilibrium.[6][citation needed] Most asteroids are rockier and less likely to be round; for example, 10 Hygiea is not, while 2 Pallas and 4 Vesta are borderline.[citation needed]

Body(a) Image Radius(b)
(km)
Mass
(1020 kg)
Density
(g/cm3)
Type(c) Remarks – shape(d) Refs (c)
r · M
2003 AZ84
208996
385 plutino; binary · M
2002 AW197
55565
384+20
−18
other TNO, detached object [24] · [24]
2013 FY27   370+45
−43
SDO Satellite 190 km in diameter [25]
Varda
174567
358 2.65 1.25 cubewano; binary [24] · [24]
2015 RR245 ~350 - - resonant KBO (2:9) -
Dysnomia
Eris I
342±25 moon of Eris large range of estimated diameters 100–660 km [26] · M
2004 GV9
90568
340±40 cubewano · M
2005 RN43
145452
340±40 cubewano · M
2002 UX25
55637
335±17 1.25 0.82 cubewano; binary [24] · [27]
2007 JJ43
278361
335±150[28] cubewano · M
Varuna
20000
334+77
−43
3.7 0.99[14] cubewano [29] · M
Ixion
28978
325+130
−110
plutino · M
2008 ST291 ~318 SDO · M
Gǃkúnǁʼhòmdímà
229762
316±17 SDO · M
Chaos
19521
300±70 cubewano · M
2001 UR163
42301
~300 SDO · M
2005 RM43
145451
~300 SDO · M
2010 KZ39 ~300 cubewano[30] · M
2010 RF43 ~300 SDO · M
2012 VP113 ~300 sednoid · M
2002 TC302
84522
290±50 resonant KBO (2:5) · M
2002 XV93 280±10 plutino · M
2003 UZ413
455502
~280 plutino · M
2010 FX86 ~280 cubewano · M
2010 RE64
523639
~280 SDO · M
2006 QH181 ~280 SDO · M
2014 UM33
472271
~270 cubewano · M
2004 XR190 ~270 SDO · M
Vesta
4
  262.7±0.1 2.59 3.46 belt asteroid formerly round (not in hydrostatic equilibrium: frozen-in ellipsoidal shape and large impact basins)[31][32] [33] · [33]
2003 VS2
84922
260±20 plutino · M
2004 TY364
120348
~260 cubewano · M
2010 VK201 ~260 cubewano · M
Pallas
2
  256±3[34] 2.11±0.26[35] 3.0±0.5 belt asteroid uncertain [34] M
Enceladus
Saturn II
  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 · M
Dziewanna
471143
240±70 SDO · M
Vanth
Orcus I
237.5±37.5 satellite of Orcus [22] · M
Miranda
Uranus V
  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
445473
~220 SDO · M
2011 FW62 ~220 other TNO · M
Hygiea
10
215±4 belt asteroid irregular · M
Proteus
Neptune VIII
  210±7 0.44 ~1.3 moon of Neptune irregular · M
2004 NT33
444030
210±40 cubewano · M
2005 QU182
303775
210±40 SDO · M
1999 CD158
469306
~210 resonant KBO (4:7) · M
2004 PF115
175113
203±43 plutino · M
2011 GM27
471288
~201 cubewano · M
1998 SN165
35671
200±20 cubewano · M
2001 QF298
469372
200±20 plutino · M
1996 GQ21
26181
~200 SDO · M
2000 YW134
82075
~200 SDO · M
Notes:
(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn II" for Enceladus), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c,d) Figures from default source Johnston's Archive—List of Known Trans-Neptunian Objects,[21] 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
plutino - trans-Neptunian object in Pluto-like orbit

From 100 to 199 kmEdit

This list contains a selection of objects estimated to be between 100 and 199 km in radius (200 and 399 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 (TNOs) 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).[36] This list is not complete, missing many poorly known TNOs.[21]

Body(a) Image Radius(b)
(km)
Mass
(1018 kg)
Type Remarks – shape Refs (c)
r · M
Mimas
Saturn I
  198.2±0.4 37.49±0.03 satellite of Saturn round (smallest known body currently known to have an ellipsoidal shape, but not in hydrostatic equilibrium) · M
2004 UX10
144897
~190 plutino · M
2010 TY53 ~183 extended centaur · M
Ilmarë
Varda I
180±20 satellite of Varda · M
2004 XA192
230965
170±60 SDO · M
Nereid
Neptune II
170±30 satellite of Neptune · M
1996 TL66
15874
170±10 SDO · M
2001 FP185
82158
166±28 SDO · M
Interamnia
704
163±1 37 belt asteroid (F) · M
Hiʻiaka
Haumea I
160 20 satellite of Haumea [37] · M
S/2010 (225088) 1
2007 OR10 I
~160 satellite of 2007 OR10 · M
2002 KX14
119951
159 cubewano · M
Europa
52
158±4 16.5 belt asteroid (C) irregular shape[38] · 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[38] · M
Actaea
Salacia I
140±10 satellite of 120347 Salacia · M
Juno
3
136±11 26.7 belt asteroid (S) irregular shape[38] [39] · M
Cybele
65
136±6 17.8 belt asteroid (outer) (C) irregular shape · M
Hyperion
Saturn VII
135±4 5.58 satellite of Saturn irregular shape · M
Eunomia
15
134±7 31.2 belt asteroid (S) irregular shape[38] · M
Camilla
107
129±7 11.2 belt asteroid (outer) (C); binary irregular shape[40] · 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 [41] · M
Sila
79360
125+15
−16
11 cubewano; binary w/ Nunam double classical Kuiper belt object 79360 Sila–Nunam [24] · M
2007 RW10
309239
124±15 TNO—quasi-satellite of Neptune · M
Chariklo
10199
124±9 centaur has rings · M
Altjira
148780
123+19
−70
trans-Neptunian object; cubewano; binary secondary S/2007 (148780) 1 [24] · M
Nunam
79360
118+14
−15
cubewano; binary w/ Sila double classical Kuiper belt object 79360 Sila–Nunam [24] · M
2001 QC298 117+11
−12
11.88±0.14 hot classical; binary [24] · M
Patientia
451
117±5 belt asteroid irregular shape · M
Bamberga
324
117±4 10 belt asteroid (C) · M
Chiron
2060 or 95P/Chiron
116±7 centaur has rings · M
Hektor
624
113±8 10 Jupiter trojan (L4); binary irregular shape · M
Thisbe
88
113±6 10.5 belt asteroid (B) irregular shape[40] · M
Ceto
65489
112±10 5.4 extended centaur; binary · [42]
S/2007 (148780) 1
Altjira I
111+17
−63
trans-Neptunian object; cubewano; binary secondary of 148780 Altjira [24] · M
Doris
48
111±4 belt asteroid irregular shape · M
Herculina
532
111±2 belt asteroid (S) irregular shape[38] · M
Eugenia
45
107±2 5.69 belt asteroid (F); trinary irregular shape[38] · M
Phoebe
Saturn IX
106.5±0.7 8.29±0.01 satellite of Saturn formerly round[43] · M
Amphitrite
29
106±3 11.8 belt asteroid (S) irregular shape[38] · M
Bienor
54598
105±15 centaur · M
Deucalion
53311
~105 cubewano · M
Fortuna
19
104±6 12.7 belt asteroid (G) irregular shape · M
Egeria
13
104±4 16.3 belt asteroid (G) irregular shape · M
Diotima
423
104±3 belt asteroid (C) irregular shape[44] · M
Aurora
94
102±2 belt asteroid irregular shape[45] · M
2015 TH367 100±60 centaur · M
Themis
24
100±10 11.3 belt asteroid (C); Themis family · M
Iris
7
100±5 13.6 belt asteroid (S) irregular shape · M
Daphne
41
100±5 belt asteroid irregular shape · M
Notes:
(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

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

From 50 to 99 kmEdit

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.[21] Asteroid spectral types are mostly Tholen, but some might be SMASS.

Body(a) Image Radius(b)
(km)
Mass
(1018 kg)
Type – remarks Citations[c]
Larissa
Neptune VII
97±3 moon of Neptune · M
Alauda
702
97±2 6.05 belt asteroid (C); binary · M
2001 QC298 I 96+9
−10
satellite of 2001 QC298 [24] · M
Palma
372
96±2 belt asteroid · M
Ursula
375
96±2 belt asteroid · M
Aletheia
259
95±3 5.97 belt asteroid · M
Metis
9
95 11.3 belt asteroid · M
Hermione
121
95 5.38 outer belt asteroid (C); binary [46] · M
Bertha
154
93±1 belt asteroid (C) · M
Hebe
6
93 12.8 belt asteroid (S) · M
Pholus
5145
92±8 6.6 centaur · M
Nemesis
128
92±3 7 belt asteroid (C) · M
Freia
76
92±2 6.5 outer belt asteroid; Cybele · M
Rhadamanthus
38083
91±47 1999 HX11; plutino? [21] · M
Elektra
130
91±6 6.6 belt asteroid (G); binary · M
Kalliope
22
90±2 8.09 belt asteroid (M); binary · M
Janus
Saturn X
89.5±1.4 1.912 moon of Saturn · M
Teharonhiawako
88611
89+16
−18
trans-Neptunian object; cubewano; primary of Sawiskera [24] · M
Germania
241
89±4 5.05 belt asteroid (C) · M
Galatea
Neptune VI
88±4 2.12 moon of Neptune · M
Aspasia
409
88±2 4.42 belt asteroid (C) · M
Lachesis
120
87 5.5 belt asteroid · M
Phorcys
Ceto I
86±5 1.67 Satellite of 65489 Ceto [42] · [42]
Siegena
386
85±4 belt asteroid (C) · M
Prokne
194
85±3 5 belt asteroid (C) · M
Winchester
747
85±3 belt asteroid · M
Hilda
153
85 5.2 belt asteroid; Hildas · M
Namaka
Haumea II
~85 2 moon of Haumea · M
Chicago
334
84±4 belt asteroid (C) · M
Aegle
96
84±3 5.1 belt asteroid · M
Amalthea
Jupiter V
84±2 2.08±0.15 moon of Jupiter · M
Stereoskopia
566
84 outer belt asteroid; Cybele [47] · M
Agamemnon
911
83 Jupiter trojan · M
Gyptis
444
82±5 12.5 belt asteroid (C) · M
Loreley
165
82±4 3.91 belt asteroid (C) · M
Elpis
59
82±3 belt asteroid · M
Diomedes
1437
82±2 4.6 Jupiter trojan · M
Borasisi
66652
81.5+16
−33
trans-Neptunian object; cubewano; binary [24] · M
Juewa
139
81±4 4 belt asteroid · M
Typhon
42355
81±4 trans-Neptunian object; binary · M
Puck
Uranus XV
81±2 moon of Uranus [48] · M
Pretoria
790
80.49 outer belt asteroid; Cybele [49] · M
Ino
173
80±3 belt asteroid (C) · M
Eunike
185
80±3 4.09 belt asteroid · M
S/2015 (136472) 1
Makemake I
80 moon of Makemake · M
Io
85
80 3.4 belt asteroid · M
Eleonora
354
77±3 belt asteroid (S) · M
Laetitia
39
76.9 3.5 belt asteroid [49] · M
Merapi
536
76±2 belt asteroid · M
Irene
14
76 8.2 belt asteroid · M
Berbericia
776
76±2 belt asteroid · M
Adeona
145
75±3 3.6 belt asteroid; Adena · M
Despina
Neptune V
75±3 moon of Neptune · M
Sycorax
Uranus XVII
~75 2.3 moon of Uranus · M
Manwë
385446
~75 resonant KBO (4:7) · M
Pales
49
74.9 2.69 belt asteroid (C) [50] · M
Julia
89
74±4 3.6 belt asteroid (S) · M
Hispania
804
74±2 9.95 belt asteroid (P) · M
Nuwa
150
73±5 3.62 belt asteroid (C) · M
Dido
209
70±5 4.28 belt asteroid (C) · M
Parthenope
11
~70 6.15 belt asteroid · M
Melpomene
18
~70 3 belt asteroid · M
Massalia
20
~70 5.67 belt asteroid · M
Nemausa
51
~70 belt asteroid · M
Alexandra
54
~70 belt asteroid · M
Hesperia
69
~70 2.76 belt asteroid (M) · M
Minerva
93
~70 2.9 belt asteroid (C); trinary · M
Arethusa
95
~70 2.6 belt asteroid · M
Dione
106
~70 belt asteroid (G) · M
Ate
111
~70 belt asteroid (C) · M
Lomia
117
~70 3.4 belt asteroid (C) · M
Meliboea
137
~70 3.2 belt asteroid · M
Lumen
141
~70 1.6 belt asteroid (C) · M
Vibilia
144
~70 3 belt asteroid · M
Lucina
146
~70 2.4 belt asteroid · M
Protogeneia
147
~70 2.5 belt asteroid · M
Sibylla
168
~70 3.42 belt asteroid (C) · M
Lamberta
187
~70 2.37 belt asteroid (C) · M
Philomela
196
~70 belt asteroid (S) · M
Isolda
211
~70 3.07 belt asteroid (C) · M
Medea
212
~70 2.64 belt asteroid · M
Hypatia
238
~70 belt asteroid (C) · M
Eukrate
247
~70 belt asteroid (C) · M
Adorea
268
~70 belt asteroid · M
Emma
283
~70 1.38 belt asteroid; binary · M
Polyxo
308
~70 belt asteroid (T) · M
Desiderata
344
~70 belt asteroid (C) · M
Dembowska
349
~70 belt asteroid (R) · M
Liguria
356
~70 belt asteroid · M
Bononia
361
~70 belt asteroid (D) · M
Bertholda
420
~70 belt asteroid (P) · M
Papagena
471
~70 belt asteroid (C) · M
Comacina
489
~70 belt asteroid · M
Princetonia
508
~70 belt asteroid · M
Achilles
588
~70 Jupiter trojan · M
Patroclus
617
~70 Jupiter trojan; binary · M
Wratislavia
690
~70 belt asteroid · M
Erminia
705
~70 belt asteroid · M
Pulcova
762
~70 belt asteroid (C); binary · M
Helio
895
~70 belt asteroid (B) · M
Äneas
1172
~70 Jupiter trojan · M
Menoetius
Patroclus I
~70 Secondary of 617 Patroclus · M
Pabu
Borasisi I
~70 Secondary of 66652 Borasisi · M
Albion
15760
69±15 cubewano, for ~25 years known as 1992 QB1 · M
Portia
Uranus XII
68±4 1.7 moon of Uranus · M
Himalia
Jupiter VI
67±10 4.19 moon of Jupiter—Himalia group [51] · [52]
Sawiskera
Teharonhiawako I
65+12
−13
Secondary of 88611 Teharonhiawako [24] · M
Astraea
5
~60 2.9 belt asteroid · M
Flora
8
~60 8.47 belt asteroid (S); Flora · M
Victoria
12
~60 belt asteroid (S) · M
Bellona
28
~60 belt asteroid (C) · M
Circe
34
~60 1.5 belt asteroid (C) · M
Leda
38
~60 1.6 belt asteroid · M
Hestia
46
~60 3.5–21 belt asteroid · [53][54]
Aglaja
47
~60 belt asteroid (C) · M
Kalypso
53
~60 belt asteroid · M
Melete
56
~60 1.5 belt asteroid · M
Mnemosyne
57
~60 belt asteroid · M
Leto
68
~60 belt asteroid (S) · M
Panopaea
70
~60 belt asteroid (C) · M
Galatea
74
~60 1.8 belt asteroid (C) · M
Diana
78
~60 belt asteroid (C) · M
Terpsichore
81
~60 belt asteroid (C) · M
Semele
86
~60 belt asteroid (C) · M
Undina
92
~60 2.1 belt asteroid (M) · M
Klymene
104
~60 2 belt asteroid · M
Artemis
105
~60 1.8 belt asteroid (C) · M
Johanna
127
~60 belt asteroid · M
Antigone
129
~60 2 belt asteroid; nickel–iron · M
Sophrosyne
134
~60 2 belt asteroid · M
Xanthippe
156
~60 belt asteroid (S) · M
Aemilia
159
~60 1.4 belt asteroid · M
Ophelia
171
~60 belt asteroid (C); Themis · M
Iduna
176
~60 belt asteroid (G) · M
Dynamene
200
~60 belt asteroid · M
Pompeja
203
~60 belt asteroid · M
Kleopatra
216
~60 belt asteroid (M); trinary · M
Henrietta
225
~60 1.83 belt asteroid (C); Cybele · M
Adelheid
276
~60 belt asteroid · M
Thule
279
~60 belt asteroid (D) · M
Gudrun
328
~60 1.94 belt asteroid (S) · M
Ornamenta
350
~60 belt asteroid (C) · M
Carlova
360
~60 belt asteroid · M
Myrrha
381
~60 belt asteroid (C) · M
Charybdis
388
~60 belt asteroid (C) · M
Thia
405
~60 belt asteroid (C) · M
Chloris
410
~60 belt asteroid (C) · M
Aurelia
419
~60 belt asteroid (F) · M
Hippo
426
~60 belt asteroid · M
Tisiphone
466
~60 belt asteroid (C) · M
Argentina
469
~60 belt asteroid; Cybele · M
Hedwig
476
~60 belt asteroid · M
Veritas
490
~60 belt asteroid; Veritas family · M
Brixia
521
~60 belt asteroid · M
Messalina
545
~60 belt asteroid · M
Scheila
596
~60 belt asteroid · M
Marianna
602
~60 belt asteroid · M
Elfriede
618
~60 belt asteroid (C) · M
Zelinda
654
~60 belt asteroid · M
Boliviana
712
~60 belt asteroid (X) · M
Tanete
772
~60 belt asteroid (C) · M
Ulla
909
~60 belt asteroid · M
Freda
1093
~60 belt asteroid · M
Odysseus
1143
~60 Jupiter trojan (L4) · M
Anchises
1173
~60 Jupiter trojan · M
Deiphobus
1867
~60 Jupiter trojan · M
Alcathous
2241
~60 Jupiter trojan · M
Teucer
2797
~60 Jupiter trojan (L4) · M
Automedon
2920
~60 Jupiter trojan (L4) · M
Makhaon
3063
~60 1.6 Jupiter trojan · M
Paris
3317
~60 Jupiter trojan · M
2006 SQ372
308933
~60 trans-Neptunian object · M
Epimetheus
Saturn XI
58±2 0.5304 moon of Saturn · [55]
Thebe
Jupiter XIV
~50 moon of Jupiter · M
Lutetia
21
~50 1.7 belt asteroid (M) · [56]
Thalia
23
~50 1.3 belt asteroid (S) · M
Eurterpe
27
~50 belt asteroid (S) · M
Urania
30
~50 belt asteroid (S) · M
Leukothea
35
~50 1.1 belt asteroid (C) · M
Atalante
36
~50 belt asteroid · M
Fides
37
~50 1.3 belt asteroid (S) · M
Harmonia
40
~50 1.3 belt asteroid (S) · M
Isis
42
~50 belt asteroid (S) · M
Virginia
50
~50 asteroid · M
Erato
62
~50 0.91 belt asteroid; Themis · M
Ausonia
63
~50 1.1 belt asteroid (S) · M
Aegina
91
~50 1.4 belt asteroid (C) · M
Ianthe
98
~50 1.2 belt asteroid (C) · M
Kassandra
114
~50 1.0 belt asteroid (T) · M
Siwa
140
~50 1.4 belt asteroid · M
Gallia
148
~50 0.98 belt asteroid (R) · M
Laurentia
162
~50 belt asteroid · M
Eva
164
~50 belt asteroid (C) · M
Andromache
175
~50 belt asteroid (C) · M
Eucharis
181
~50 1.2 belt asteroid (K) · M
Kolga
191
~50 1.08 belt asteroid (C) · M
Nausikaa
192
~50 belt asteroid (S) · M
Eos
221
~50 belt asteroid (K) · M
Athamantis
230
~50 belt asteroid (S) · M
Asterope
233
~50 belt asteroid (T) · M
Vanadis
240
~50 belt asteroid (C) · M
Hermentaria
346
~50 belt asteroid (S) · M
Ninina
357
~50 belt asteroid · M
Corduba
365
~50 belt asteroid (C) · M
Aquitania
387
~50 belt asteroid (S) · M
Ottilia
401
~50 belt asteroid · M
Arsinos
404
~50 belt asteroid (C) · M
Marion
506
~50 belt asteroid (C) · M
Armida
514
~50 belt asteroid · M
Helga
522
~50 belt asteroid; Cybele · M
Kythera
570
~50 belt asteroid · M
Polyxena
595
~50 belt asteroid · M
Notburga
626
~50 belt asteroid · M
Nestor
659
~50 Jupiter trojan · M
Gerlinde
663
~50 belt asteroid · M
Luscinia
713
~50 belt asteroid (C) · M
Mandeville
739
~50 belt asteroid (X) · M
Irmintraud
773
~50 asteroid (D) · M
Hohensteina
788
~50 belt asteroid · M
Ani
791
~50 belt asteroid · M
Tauris
814
~50 belt asteroid · M
Flammario
1021
~50 asteroid · M
Troilus
1208
~50 Jupiter trojan · M
Rollandia
1269
~50 belt asteroid · M
Abastumani
1390
~50 belt asteroid · M
Antilochus
1583
~50 Jupiter trojan · M
Euforbo
4063
~50 Jupiter trojan · 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

Legend:

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

From 20 to 49 kmEdit

This list contains a few examples because there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 49 km.[57] 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.

Body(a) Image Radius(b)
(km)
Mass
(1015 kg)
Type – notes Refs (c)
r · M
Elara
Jupiter VII
~45 moon of Jupiter; Himalia group · M
Juliet
Uranus XI
~45 moon of Uranus · M
17 Thetis ~45 1200 asteroid · M
26 Proserpina ~45 900 asteroid · M
58 Concordia ~45 850 asteroid · M
72 Feronia ~45 670 asteroid · M
100 Hekate ~45 1000 asteroid · M
103 Hera ~45 790 belt asteroid (S) · M
109 Felicitas ~45 750 asteroid · M
110 Lydia ~45 670 asteroid · M
143 Adria ~45 760 belt asteroid · M
227 Philosophia ~45 belt asteroid · M
229 Adelinda ~45 belt asteroid (C) · M
345 Tercidina ~45 belt asteroid (C) · M
379 Huenna ~45 480 belt asteroid (C) · M
Echidna
Typhon I
44±3 satellite of 42355 Typhon binary · M
90 Antiope A 43.9±0.5 410 asteroid (C); binary [58] · M
Prometheus
Saturn XVI
43.1±2.7[59] 156.6 moon of Saturn · M
8405 Asbolus 42.5 centaur  · M
S/2000 (90) 1 41.9±0.5 satellite of 90 Antiope binary [58] · M
Pandora
Saturn XVII
~40 135.6 moon of Saturn · M
Cressida
Uranus IX
~40 moon of Uranus · M
Belinda
Uranus XIV
~40 moon of Uranus · M
Thalassa
Neptune IV
~40 moon of Neptune · M
Thorondor
Manwë I
~40 satellite of 385446 Manwë binary · M
25 Phocaea ~40 asteroid · M
32 Pomona ~40 asteroid · M
61 Danae ~40 asteroid · M
71 Niobe ~40 610 asteroid · M
80 Sappho ~40 asteroid · M
83 Beatrix ~40 560 belt asteroid (X) · M
84 Klio ~40 520 asteroid · M
97 Klotho ~40 590 asteroid · M
102 Miriam ~40 asteroid · M
115 Thyra ~40 asteroid · M
122 Gerda ~40 570 belt asteroid (S) · M
124 Alkeste ~40 470 belt asteroid (S) · M
135 Hertha ~40 asteroid · M
1001 Gaussia ~40 asteroid · M
55576 Amycus ~40 centaur · M
58534 Logos ~40 270 Kuiper belt object; cubewano; binary · M
60558 Echeclus
174P/Echeclus
~40 centaur[60] · M
Rosalind
Uranus XIII
~35 250 moon of Uranus · M
Caliban
Uranus XVI
~35 moon of Uranus · M
Naiad
Neptune III
~35 moon of Neptune · M
Weywot
Quaoar I
~35 satellite of Quaoar · M
Zoe
Logos I
~35 satellite of 58534 Logos binary · M
43 Ariadne ~35 asteroid · M
44 Nysa ~35 370 belt asteroid (E) · M
55 Pandora ~35 asteroid · M
66 Maja ~35 asteroid · M
77 Frigga ~35 350 asteroid · M
79 Eurynome ~35 asteroid · M
99 Dike ~35 390 asteroid · M
101 Helena ~35 300 asteroid · M
112 Iphigenia ~35 asteroid · M
116 Sirona ~35 belt asteroid · M
133 Cyrene ~35 310 belt asteroid (S) · M
10370 Hylonome ~35 centaur · M
Pasiphae
Jupiter VIII
~30 moon of Jupiter · M
Desdemona
Uranus X
~30 moon of Uranus · M
Halimede
Neptune IX
~30 moon of Neptune · M
Neso
Neptune XIII
~30 moon of Neptune · M
Comet Hale–Bopp
C/1995 O1
~30 comet · M
60 Echo ~30 asteroid · M
64 Angelina ~30 belt asteroid (E) · M
67 Asia ~30 asteroid · M
75 Eurydike ~30 180 belt asteroid (M) · M
82 Alkmene ~30 asteroid · M
108 Hecuba ~30 390 asteroid · M
119 Althaea ~30 200 belt asteroid (S) · M
142 Polana ~30 180 belt asteroid (F) · M
7066 Nessus ~30 centaur · M
52975 Cyllarus ~30 centaur · M
83982 Crantor ~30 centaur · M
253 Mathilde 26.4 103.3 belt asteroid (C) · M
Carme
Jupiter XI
~25 130 moon of Jupiter; Carme group · 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
113 Amalthea ~25 100 belt asteroid · M
123 Brunhild ~25 belt asteroid · M
138 Tolosa ~25 99 belt asteroid (S) · M
1000 Piazzia ~25 belt asteroid · M
4348 Poulydamas ~25 asteroid; Jupiter Trojan · M
52872 Okyrhoe 24.5 centaur · M
Hydra
Pluto III
22.5 moon of Pluto [61] · M
Nix
Pluto II
21 moon of Pluto [62] · M
Sinope
Jupiter IX
~20 76 moon of Jupiter · M
Lysithea
Jupiter X
~20 63 moon of Jupiter; Himalia group · M
Metis
Jupiter XVI
~20 36 moon of Jupiter · M
Siarnaq
Saturn XXIX
~20 moon of Saturn · M
Cordelia
Uranus VI
~20 44 moon of Uranus · M
Ophelia
Uranus VII
~20 53 moon of Uranus · M
Psamathe
Neptune X
~20 37 moon of Neptune · M
Sao
Neptune XI
~20 moon of Neptune · M
Laomedeia
Neptune XII
~20 moon of Neptune · M
29P/Schwassmann–
Wachmann
~20 comet; centaur · M
73 Klytia ~20 92 asteroid · M
118 Peitho ~20 76 belt asteroid · M
125 Liberatrix ~20 87 belt asteroid (M) · M
126 Velleda ~20 94 belt asteroid · M
131 Vala ~20 69 belt asteroid · M
132 Aethra ~20 82 belt asteroid (M) · M
136 Austria ~20 68 belt asteroid (M) · M
158 Koronis ~20 belt asteroid; Koronis family; S-type · M
167 Urda ~20 66.7 belt asteroid; Koronis family; S-type · M
208 Lacrimosa ~20 73.9 belt asteroid (S) Koronis · 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 19 kmEdit

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 moons.

Body(a) Image Radius(b)
(km)
Mass
(1015 kg)
Type – notes Refs (c)
r · M
944 Hidalgo 19 centaur, first to be discovered in 1920; historically called asteroid. [63] · M
Helene
Saturn XII, Dione B
17.6±0.4 25 moon of Saturn; Dione trojan [59] · M
Hippocamp
Neptune XIV
[[File::S-2004_N1_Hubble_montage.jpg|50px|center]] 17.4 moon of Neptune [62] · M
2014 MU69
486958
15.85±0.25 KBO, cubewano, TNO [64] · M
243 Ida 15.7 42 belt asteroid; Koronis family; S-type; binary [65] · M
1655 Comas Solà 15.3±1.1 belt asteroid; B-type [66] · M
Atlas
Saturn XV
15.1±0.9 66 moon of Saturn [59] · M
Ananke
Jupiter XII
~15 38.2 moon of Jupiter · M
Albiorix
Saturn XXVI
~15 moon of Saturn · M
Stephano
Uranus XX
~15 22 moon of Uranus · M
Perdita
Uranus XXV
~15 13 moon of Uranus · M
Linus
Kalliope I
~15 60 asteroid moon of 22 Kalliope · [67]
226 Weringia ~15 belt asteroid; S-type · M
1036 Ganymed ~15 33 NEA · M
1815 Beethoven ~15 belt asteroid · M
31824 Elatus ~15 centaur · M
Pan
Saturn XVIII
14.1±1.3 4.95 moon of Saturn [6] · [68]
20461 Dioretsa 14±3 [69] centaur;[70] damocloid
Telesto
Saturn XIII or Tethys B
12.4±0.4 moon of Saturn Tethys trojan [59] · M
Phobos
Mars I
11.267 10.7 moon of Mars · M
Calypso
Saturn XIV or Tethys C
10.7±0.7 moons of Saturn; Tethys trojan [59] · M
Leda
Jupiter XIII
~10 11 moon of Jupiter; Himalia group · M
Adrastea
Jupiter XV
~10 2 moon of Jupiter · M
Ymir
Saturn XIX
~10 moon of Saturn · M
Paaliaq
Saturn XX
~10 8.2 moon of Saturn · M
Tarvos
Saturn XXI
~10 moon of Saturn · M
Kiviuq
Saturn XXIV
~10 moon of Saturn · M
Trinculo
Uranus XXI
~10 3.9 moon of Uranus · M
Francisco
Uranus XXII
~10 7.2 moon of Uranus · M
Margaret
Uranus XXIII
~10 5.4 moon of Uranus · M
Ferdinand
Uranus XXIV
~10 5.4 moon of Uranus · M
Cupid
Uranus XXVII
~10 3.8 moon of Uranus · M
Kerberos
Pluto IV
~10 moon of Pluto · M
Styx
Pluto V
~10 moon of Pluto · M
Romulus
Sylvia I
~10 4 asteroid moon of 87 Sylvia · M
149 Medusa ~10 8 belt asteroid · M
S/2006 (624) 1
Hektor I
~10 asteroid moon of 624 Hektor · M
2002 Euler ~10 5.5 belt asteroid · M
2685 Masursky ~10 5–11 belt asteroid · M
433 Eros 8.42 66.9 Amor/ NEA; spacecraft orbited and landed [47][71] · M


2000 Herschel 7.384 belt asteroid[72] [73]  · M
Deimos
Mars II
6.2±0.18 1.48 moon of Mars [74] · M
951 Gaspra 6.1±0.4 2–3 belt asteroid [75] · M
2002 RP120
65407
~6 3.1 Damocloid (retrograde) & possible ejected SDO · M
Callirrhoe
Jupiter XVII
~5 moon of Jupiter · M
Themisto
Jupiter XVIII
~5 0.69 moon of Jupiter · M
Ijiraq
Saturn XXII
~5 moon of Saturn · M
Erriapus
Saturn XXVIII
~5 moon of Saturn · M
Bestla
Saturn XXXIX
~5 moon of Saturn · M
Mab
Uranus XXVI
~5 moon of Uranus · M
Halley's Comet ~5 0.03 comet · [76]
Petit-Prince
Eugenia I
~5 1.2 asteroid moon of 45 Eugenia · M
S/2004 (45) 1
Eugenia II
~5 asteroid moon of 45 Eugenia · M
Remus
Sylvia II
~5 0.2 asteroid moon of 87 Sylvia · M
S/2001 (107) 1
Camilla I
~5 1.5 asteroid moon of 107 Camilla · M
S/2002 (121) 1
Hermione I
~5 1.6 asteroid moon of 121 Hermione · M
S/2003 (379) 1
Huenna I
~5 asteroid moon of 379 Huenna · M
3200 Phaethon ~5 0.14 Apollo asteroid; B-type · M
26858 Misterrogers ~5 belt asteroid · M
118401 LINEAR ~5 0.23 main-belt comet · M
2P/Encke <5 comet · M
17P/Holmes <5 comet · M
C/1996 B2
Comet Hyakutake
<5 comet[77] · M
3753 Cruithne <5 0.13 Aten asteroid & quasi-satellite of Earth · M
4055 Magellan <5 Amor asteroid; V-type · M
1998 QE2
285263
<5 NEA; binary · M
32P/Comas Solà 4.2 Jupiter-family comet[78] [79] · M
Daphnis
Saturn XXXV
3.8±0.8 0.084 moon of Saturn · [68]
S/2003 (130) 1
Elektra I
~3.5 0.4 asteroid moon of 130 Elektra [46] · M
9P/Tempel 2.8 0.075 comet [80] · M
2867 Šteins 2.65 belt asteroid; E-type [81] · M
19P/Borrelly 2.4 Jupiter-family comet[78] [82] · M
Pallene
Saturn XXXIII
2.22±0.07[83] 0.043 moon of Saturn · M
5535 Annefrank 2.17 belt asteroid, flyby visit by Stardust · M
81P/Wild
Wild 2
<2 comet; 2004 flyby Stardust (spacecraft) · M
67P/Churyumov–Gerasimenko 1.9 Jupiter-family comet[78] · M
1999 JM8
53319
1.75 Apollo asteroid; PHA [84] · M
1986 DA
6178
1.575 0.002 amor asteroid; M-type · M
Methone
Saturn XXXII
1.45±0.03[83] 0.019 moon of Saturn · M
Polydeuces
Saturn XXXIV, Dione C
1.3±0.4 0.03 moon of Saturn; Dione trojan [6] · M
132524 APL
2002 JF56
1.25[85] belt asteroid - New Horizons flyby 2006 · M
4179 Toutatis 1.23 0.05 NEA, Chang'e 2 flyby visited · M
Notes:
(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn I" for Mimas), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

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

Types:

Main belt asteroids; Comets; NEA: Near-Earth asteroid; Asteroid moon

Below 1 kmEdit

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,[86] 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). 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)
1620 Geographos 885 4 NEA · Apollo [87] · M
1862 Apollo 850 5.1 NEA · Apollo · Q-type · M
9969 Braille 800 Mars-crosser asteroid; Deep Space 1 1999 flyby r{·}}M
(214869) 2007 PA8 ~800 NEA · Apollo [88] · M
100000 Astronautica ~800 Inner belt asteroid[89] [90] · M
Dactyl
Ida I
  700 Moon of 243 Ida · M
1566 Icarus 700 2.9 NEA · Apollo · U-type · M
4769 Castalia 700 1.3 NEA · Apollo [91] · M
(137108) 1999 AN10 650 NEA · Apollo · M
(29075) 1950 DA 600 3 NEA · Apollo; Earth-radared · M
(66391) 1999 KW4 600 2.33 NEA · Aten · Mercury-crosser · M
46P/Wirtanen 600 Comet · M
103P/Hartley
Hartley 2
  570±80 0.3 Comet; flyby Deep Impact (spacecraft) · [92]
162173 Ryugu 565 NEA · visited by Hayabusa2 (2018-) · M
3908 Nyx   520 5 NEA · Amor · V-type · M
14827 Hypnos 450 Comet · dormant comet[93] [94] · M
2062 Aten 450 0.76 NEA · Aten [95] · M
2007 CA19 432 1.2 NEA · Apollo · M
6489 Golevka 350 NEA · Apollo [96] · M
25143 Itokawa 346 0.0358 NEA · Apollo · M
Aegaeon
Saturn LIII
330±60[83] moon of Saturn · M
2004 XP14 300 NEA · Apollo · M
(144898) 2004 VD17 290 3 NEA · Apollo · [97]
101955 Bennu 262 NEA · Apollo · PHO
(308635) 2005 YU55 180 NEA[98] Apollo · PHO[99] [100] · M
4660 Nereus 165 NEA · Apollo [101] · M
(357439) 2004 BL86   162.5 NEA · Apollo · binary · M
99942 Apophis   162.5 0.05 NEA · Aten · PHO [102] · [97]
S/2009 S 1 150 moon of Saturn · M
2010 TK7 150 Earth trojan · Apollo · M
2007 TU24 125 NEA · Apollo · PHO [103] · M
2002 JE9 100 NEA · Apollo · PHO · M
2010 XC15 100 NEA · Apollo · PHO · M
1994 WR12 65 0.002 NEA · Aten [104] · [97]
(410777) 2009 FD   65 0.0028 NEA · Apollo [105] · [105]
2008 HJ 18 0.000005 NEA · fast rotator, LCDB, (43 s)[106] [106] · [106]
367943 Duende   15 NEA · M
1998 KY26   15 NEA · fast rotator (10 min) [107] · M
Notes:
(a) Name of body, including alternative names using Roman numerals to designate moons (such as "Saturn LIII" for Aegaeon), and numbers to designate minor planets
(b) Mean radius including uncertainties
(c) Reference column specifically for radius (r) and mass (M) citations

Legend:

  minor-planet moon    moon of Saturn
NEA: near-Earth asteroid; Apollo asteroids are a group of NEAs

Surface gravityEdit

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:

 

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

 

where

T is the rotation period of the celestial body

The surface gravity at the equator is then given by:

 

See alsoEdit

NotesEdit

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 readingEdit

External linksEdit