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Amalthea
Amalthea
Adjective(s) Unknown
Orbital properties
Aphelion/apoapsis 182840 km
Perihelion/periapsis 181150 km
Semi-major axis Unknown
Orbital eccentricity Unknown
Orbital period 11 h, 57 min, 23 s
Average orbital speed 26.57 km/s
Physical properties
Radius 181365.84±0.02 km (2.54 RJ)
Mass (2.08±0.15)×1018 kg
Mean density 0.857±0.099 g/cm³
Escape velocity Unknown
Rotation period Unknown
Average surface temperature 120 K
Apparent magnitude 14.1
Moons 0

Amalthea is the third moon of Jupiter in order of distance from the planet. It was discovered on September 9, 1892, by Edward Emerson Barnard and named after Amalthea, a nymph in Greek mythology. It is also known as Jupiter V.

Amalthea is in a close orbit around Jupiter and is within the outer edge of the Amalthea Gossamer Ring, which is formed from dust ejected from its surface. From its surface, Jupiter would be an astonishing sight in its sky, appearing 46.5 degrees in diameter. Amalthea is the largest of the inner satellites of Jupiter. Irregularly shaped and reddish in color, it is thought to consist of porous water ice with unknown amounts of other materials. Its surface features include large craters and ridges.

Amalthea was photographed in 1979 and 1980 by the Voyager 1 and 2 spacecraft, and later, in more detail, by the Galileo orbiter in the 1990s.

Jovian Moons
Metis - Adrastea - Amalthea - Thebe - Io - Europa - Ganymede - Callisto - Themisto - Leda - Himalia - Lysithea - Elara - Dia - Carpo - S/2003 J 12 - Euporie S/2003 J 3 - S/2003 J 18 - S/2011 J 1 - S/2010 J 2 - Thelxinoe - Euanthe - Helike - Orthosie Iocaste - S/2003 J 16 - Praxidike - Harpalyke - Mneme - Hermippe - Thyone - Ananke - Herse - Aitne - Kale - Taygete - S/2003 J 19 - Chaldene - S/2003 J 15 - S/2003 J 10 - S/2003 J 23 - Erinome - Aoede - Kallichore - Kalyke - Carme - Callirrhoe - Eurydome - S/2011 J 2 - Pasithee S/2010 J 1 - Kore - Cyllene - Eukelade - S/2003 J 4 - Pasiphaë - Hegemone - Arche - Isonoe - S/2003 J 9 - S/2005 J 5 - Sinope - Sponde - Autonoe Megaclite - S/2003 J 2

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