Comparative data for the Sun, planets, and other solar system objects

object distance from Sun

(average, except where ranges are given) mean density (g/cm³) mass (Earth

masses) known moons known ring system orbit around Sun rotation period** (Earth days) radius (approxi-

mate; km) inclination of equator to orbit (obliquity; in degrees)

AU* million km eccentricity inclination to ecliptic (degrees) year (sidereal period of revolution; in Earth years)

Sun -- -- 1.4 330,000 -- -- -- -- -- 25-36, depending on latitude 696,000 --

Mercury 0.4 58 5.4 0.055 0 no 0.21 7.0 0.24 58.6 2,440 probably 0.0

Venus 0.7 108 5.2 0.82 0 no 0.007 3.4 0.62 243 R 6,050 177.3

Earth 1 150 5.5 1 1 no 0.017 0.0 1.00 0.997 6,380 23.5

Mars 1.5 228 3.9 0.11 2 no 0.093 1.9 1.88 1.03 3,400 25.2

asteroids (asteroid) 2-4.5 (main and outer belts) 300-600 typically

2-4 total less than 0.001 -- -- -- -- -- -- -- --

Jupiter 5.2 778 1.3 320 more than 60 yes 0.048 1.3 11.86 0.41 71,500 3.1

Saturn 9.5 1,430 0.7 95 at least 47 yes 0.054 2.5 29.4 0.44 60,300 26.7

Centaur objects (Centaur object) (comets) 5-30 (mainly between orbits of Jupiter and Neptune) 750-4,490 possibly less than 1 total possibly 0.0001 -- -- -- -- -- -- -- --

Uranus 19.2 2,870 1.3 14.5 at least 27 yes 0.047 0.8 84.0 0.72 R 25,600 97.9

Neptune 30.1 4,500 1.6 17 at least 13 yes 0.009 1.8 164 0.67 24,800 29.6

Pluto 39.5 5,910 2.0 0.0025 at least 3 no 0.25 17.1 248 6.39 R 1,170 120

Kuiper belt objects (comets) 30-50 (main concentration) 4,500-7,500 possibly less than 1 total possibly as much as 0.5 -- -- -- -- -- -- -- --

Oort cloud objects (comets) 20,000- 100,000 3,000,000- 15,000,000 possibly less than 1 total possibly 10-300 -- -- -- -- -- -- -- --

*One astronomical unit (AU) is the mean distance of Earth from the Sun, about 150 million km.

**R following the quantity indicates retrograde rotation.