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Amalthea is one of Jupiter's moons, a small rocky body that orbits the giant planet. It is notable for being the third-closest moon to Jupiter and for its distinctive reddish color, which scientists believe comes from sulfur compounds deposited on its surface.
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Apparent magnitude 14.1 Absolute magnitude (H) 7.2
Amalthea (/æməlˈθiːə/) is a moon of Jupiter. It has the third-closest orbit around Jupiter among known moons and was the fifth moon of Jupiter to be discovered, so it is also known as Jupiter V. It is also the fifth-largest moon of Jupiter, after the four Galilean moons. Edward Emerson Barnard discovered the moon on 9 September 1892 and named it after Amalthea of Greek mythology. It was the last natural satellite to be discovered by direct visual observation; all later moons were discovered by photographic or digital imaging.