List Of Solar System Objects By Size

Here is a list of major solar system objects, ordered by size (average diameter in kilometers for spherical objects, the equivalent sphere diameter for irregular objects).

Criteria

The following list gives the dimensions of certain objects in the solar system. This list is not exhaustive, however, contains:

• the Sun ,
• the planets ,
• their satellites ,
• the dwarf planets
• some other significant objects ( asteroids , trans-Neptunian , etc.).

The size of the more recently discovered objects may be only an approximation. The diameter of an object as distant as (90377) Sedna , for example, is not known with accuracy. Also, this list should not be considered definitive because many objects (not just small) there may change or be added up. It should be reliable for the first fifteen places around. It should also be almost complete in terms of asteroids (main belt) of 200 km in diameter or more.

List

It is assumed that all objects larger than 200 km are large enough to have approached the hydrostatic equilibrium (a nearly spherical shape).

More than 2 000 km

Rank	Name	Image	Type	Mean radius ( km )	Diameter equatorial ( km )	Volume (10 9 km )	Mass 10 21 kg ( Yg )	Mass (M Earth)	Gravity (M / s )
1	Sun		Star	696 000	1 392 000	1 412 000 000	1 989 100 000	332 837	274,0
2	Jupiter		Gas giant	69 911	142 984	1 431 280	1 898 600	317,83	24,79
3	Saturn		Gas giant	58 232	120 536	827 130	568 460	95,159	10,445
4	Uranus		Gas giant	25 362	51 118	68 340	86 832	14,536	8,87
5	Neptune		Gas giant	24 622	49 528	62 540	102 430	17,147	11,15
6	Earth		Terrestrial planet	6 371,0	12 756	1 083,21	5 973,6	1	9,78
7	Venus		Terrestrial planet	6 051,8	12 104	928,43	4 868,5	0,815	8,872
8	March		Terrestrial planet	3 390,0	6 780	163,18	641,85	0,107	3,7
9	Ganymede		Satellite of Jupiter	2 631,2	5 262	76,30	148,2	0,0248	1,428
10	Titan		Satellite of Saturn	2 576	5 150	71,52	134,5	0,0225	1,354
11	Mercury		Terrestrial planet	2 439,7	4 878	60,83	330,2	0,0553	3,7
12	Callisto		Satellite of Jupiter	2 410,3	4 821	58,65	107,6	0,018	1,23603
13	Io		Satellite of Jupiter	1 821,5	3 643	25,32	89,3	0,015	1,797
14	Moon		Satellite Earth	1 737,1	3 474	21,958	73,5	0,0123	1,625
15	Europe		Satellite of Jupiter	1 561	3 122	15,93	48	0,00803	1,316
16	Triton		Satellite of Neptune	1 353,4	2 707	10,38	21,5	0,00359	0,782
17	Eris		Object scattered	1 300	2 600	7	16,7	0,0027	0,662
18	Pluto		Kuiper Belt - Plutino	1 151	2 310	7,15	13,105	0,0022	0,61

500 to 2 000 km

Curiously, the size of solar system objects currently known decreases sharply after that of Pluto:

Rank	Name	Image	Type	Mean radius ( km )	Diameter equatorial ( km )	Volume (10 9 km )	Mass 10 21 kg ( Yg )	Mass (M Earth)	Gravity (M / s )
19	Titania		Satellite of Uranus	788,9	1 578	2,06	3,526	0,00059	0,378
20	Rhea		Satellite of Saturn	764,4	1 528	1,87	2,3166	0,00039	0,26
21	Oberon		Satellite of Uranus	761,4	1 523	1,85	3,014	0,0005	0,347
22	Makemake		Kuiper Belt	750	1 500	1,8	4	0,00067	0,47
23	Sedna *		Detached object	745	1 200 to 1 600	1,73	3	0,00050	0,33-0,50
24	Iapetus		Satellite of Saturn	736	1 436	1,55	1,9739	0,00033	0,223
25	Charon		Satellite of Pluto	604	1 210	0,87	1,52	0,00025	0,279
26	2007 OR 10 *		Object scattered	600	1 200	0,904	1,81	0,0003	0,017
27	Umbriel		Satellite of Uranus	584,7	1 169	0,84	1,2	0,00020	0,234
28	Ariel		Satellite of Uranus	578,9	1 158	0,81	1,35	0,00022	0,269
29	Haumea		Kuiper Belt	575	1 150	1,3-1,6	4,2	0,00069	0,44
30	(84522) 2002 TC 302		Kuiper Belt - 2:5 resonance with Neptune	572,7	1 150	0,786	1,573	0,00026	0,321

* The radius is known only very approximately

200 to 500 km

Examples of objects between 10 and 200 km

Examples of items of less than 10 km

See also

Internal Links

• List of solar system objects classified by weight
• Solar system objects classified by brightness

External Links

• (In) Planetary Fact Sheets (NASA)

The Solar System
Sun Mercury Venus Earth March Ceres Jupiter Saturn Uranus Neptune Pluto Haumea Makemake Eris
Massive objects in the Kuiper Belt	Sedna Quaoar (225088) 2007 OR 10 Charon (84522) 2002 TC 302 Orcus Varuna 2007 UK126 2005 QU182
Moons and asteroid moons	Mercurial Venusian Land : Moon Martian Jovian : Io Europe Ganymede Callisto Saturn : Titan Uranian Neptunian : Triton Plutonniennes Haumeainnes Erisians
Rings	Jovian Saturniens Uranians Neptunian Plutonian Ganymede Callisto Europe Rhea
Small bodies	Asteroids ( list ): Pallas Juno Vesta Comets : 1P/Halley 2P/Encke Damocloids Meteoroids
Main areas	Vulcanoids Belt asteroids Centaurus Kuiper belt Scattered disc objects Objects detached Hills Cloud Oort Cloud
Other	Heliosphere Heliopause heliosheath Formation and evolution of the solar system Interplanetary medium Hypothetical Planets C/1992 J1
List of solar system objects sorted by: size mass distance from the Sun

• Astronomy portal

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