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List of solar system objects by radius

From Academic Kids

This is a list of solar system objects by radius, in decreasing order.

In the case of the Sun, Jupiter, and Saturn, the volumetric mean radius is used. For mostly spherical objects (oblate) such as planets and large planetoids, the equatorial radius is used. For irregular objects, the radii along three axes are given.

The ordering is not the same as the order of a list of solar system objects by mass because some objects are denser than others. For instance Uranus is bigger than Neptune but less massive, and although Ganymede and Titan are larger than Mercury, they have less than half its mass.

The list is incomplete because the radii of many asteroids are not accurately known, or even well-defined in the case of irregular objects.

ObjectRadius in kmMargin of error
Sun696 000
Jupiter69 9116
Saturn58 2326
Uranus25 36212
Neptune24 62421
Earth6 371.010.02
Venus6 051.840.01
Mars3 389.920.04
Ganymede2 631
Titan2 575
Mercury2 4401
Callisto2 410
Io 1 822
Moon1 738
Europa1 561
Triton1 353
Pluto1 151+55 -1
90377 Sedna>800
90482 Orcus800
Titania789
Rhea764
Oberon761
Iapetus718
50000 Quaoar~600
Charon593
Umbriel585
Ariel581 × 578 × 578
Dione560
28978 Ixion532
Tethys536 × 528 × 526
20000 Varuna~500
1 Ceres485
2 Pallas285
4 Vesta234
10 Hygiea204
511 Davida163
...
3 Juno117
...
45 Eugenia113
...
2060 Chiron90
...

The rankings of some remaining natural satellites are shown below. There are various asteroids larger than many of these, but the exact sizes of many asteroids are not known precisely enough although asteroid diameters can sometimes be determined by timing stellar occultations. In any case many asteroids are known to be highly irregular in shape—some are not even approximately spherical—making any comparison of radii infeasible even if exact figures are known.

Enceladus 256 × 247 × 245
Miranda 240 × 234 × 233
Proteus 220 × 208 × 202
Mimas 209 × 196 × 191
Hyperion 185 × 140 × 113
Nereid 170
Amalthea 131 × 73 × 67
Phoebe 115 × 110 × 105
Larissa 108 × 102 × 84
Galatea 102 × 92 × 72
Janus 97 × 95 × 77
Sycorax 95
Despina 90 × 74 × 64
Himalia 85
Puck 81
Prometheus 74 × 50 × 34
Epimetheus 69 × 55 × 55
Portia 67.5
Thebe 55 × 45
Pandora 55 × 44 × 31
Thalassa 54 × 50 × 26
Caliban 49
Naiad 48 × 30 × 26
Juliet 47
Elara 43
Belinda 40.5
Cressida 40
S/1986 U 10 40
Rosalind 36
Desdemona 32
Pasipha 30
Bianca 25.5
S/2002 N 1 24
S/2002 N 2 24
S/2002 N 3 24
S/2002 N 4 24
Carme 23
Metis 21.5
Ophelia 21.5
Cordelia 20
Sinope 19
Helene 18 × 16 × 15
Lysithea 18
Atlas 16.5
Siarnaq 16
Prospero 15
Setebos 15
Calypso 15 × 8
Ananke 14
S/2003 N 1 14
Phobos 13.4 × 11.2 × 9.2
Albiorix 13
Adrastea 13 × 10 × 8
Leda 10
Pan 10
Stephano 10
Paaliaq 9.5
S/2003 U 1 8
Ymir 8
Deimos 7.5 × 6.1 × 5.2
Kiviuq 7
Polydeuces 6.5
Tarvos 6.5
S/2001 U 2 6
S/2001 U 3 6
S/2003 U 2 6
S/2003 U 3 5.5
Ijiraq 5
Trinculo 5
Callirrhoe 2.5
Erriapo 4.5
Themisto 4
Narvi 3.5
Praxidike 3.5
S/2005 S 1 3.5
S/2004 S 18 3.5
Mundilfari 3
S/2004 S 7 3
S/2004 S 8 3
S/2004 S 10 3
S/2004 S 11 3
S/2004 S 13 3
S/2004 S 14 3
S/2004 S 15 3
Skathi 3
Suttungr 3
Thrymr 3
Iocaste 2.5
Kalyke 2.5
Megaclite 2.5
S/2004 S 9 2.5
S/2004 S 12 2.5
Taygete 2.5
S/2004 S 3 2.5–2
Aoede 2
Autonoe 2
Chaldene 2
Eukelade 2
Harpalyke 2
Helike 2
Hermippe 2
Isonoe 2
Pallene 2
S/2000 J 11 2
S/2003 J 5 2
S/2004 S 16 2
S/2004 S 17 2
Thyone 2
Aitne 1.5
Arche 1.5
Carpo) 1.5
Erinome 1.5
Euanthe 1.5
Eurydome 1.5
Hegemone 1.5
Methone 1.5
Cyllene 1
Euporie 1
Kale 1
Kallichore 1
Mneme 1
Orthosie 1
Pasithee 1
S/2003 J 2 1
S/2003 J 3 1
S/2003 J 4 1
S/2003 J 10 1
S/2003 J 14 1
S/2003 J 15 1
S/2003 J 16 1
S/2003 J 17 1
S/2003 J 18 1
S/2003 J 19 1
S/2003 J 23 1
Sponde 1
Thelxinoe 1
S/2003 J 9 0.5
S/2003 J 12 0.5

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