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Jupiter
subject			fact

Jupiter	has polar radius 6.7 × 109 cm
	has obliquity 3°.1
	has core composition metallic hydrogen in a pressure-ionized liquid phase
	has atmosphere composition primarily H2 (85%) and He (14%), with traces of methane, ammonia
	has oblateness 0.065 (from Pioneer 10)
	has equatorial radius 7.135 × 109 cm = 11 REarth
	has inclination i = 1°18'18"
	has eccentricity e = 0.048
	has magnetic field 4 gauss (data from Pioneer 10)
	has central temperature 5 × 104 K
	has central density 35 megabar
	has surface gravity 2.7 that of Earth
	has escape velocity Vesc = 61 km s-1
	has magnetic axis offset 0.1 Jupiter radius from the center of the planet (data from Pioneer 10)
	has magnetic axis inclination 15° to the rotational axis (data from Pioneer 10)
	has has surface temperature 120 K
	has has albedo 0.51
	has has synodic period 398.9 days
	has has mean orbital velocity 13.06 km s-1
	has has orbital period 11.86 years
	has semi-major axis 5.203 AU
	has mean density 1.33 g cm-3< sup>
	is a part of our solar system
	has rotational period 9h50m at equator; 9h55m at polar regions (see Systems I and II longitude).
	has mass 1.90 × 1030 g = 318 MEarth
	has definition Fifth planet from the Sun. It is more massive than all other planets and satellites combined; if it were about 80 times more massive, it would become self-luminous due to fusion reactions. The heat flux to from the center to the surface is mainly convective. For both Jupiter and Saturn it is necessary to invoke a substantial source of internal heating (presumably gravitational contraction) to account for the surface temperature (Jupiter radiates about 2 1/2 times as much heat as it receives from the Sun). Jupiter's surface shows pronounced horizontal striations: the light layers (zones) are at a slightly higher altitude and about 15° cooler than the dark layers (belts). It is surrounded by a partial torus of atomic H in the orbit of Io. Thirteen satellites, the four outermost of which have retrograde motion, high eccentricity, and high inclination. (Jupiter XIII, discovered in 1974, has a period of 239 days; i = 26°.7, e = 0.147.)
	is an instance of gas giant
	is an instance of superior planet
	is an instance of naked eye planet
naked eye planet	has motion relative to stars epicycloidal
	has been observed for many centuries
	has apparent magnitude brighter than 5
gas giant	has composition Mostly made of various light elements such as gases and simple compounds
	has synonym Jovian planet
planet	is a part of solar system
	has orbit
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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