Their semi-major axes range between 128,000 and 222,000 km.. On the other hand, there are two sub-groups of irregular satellites namely prograde and retrograde. Examples of … The 5th planet from the Sun and the most massive one, Jupiter is 317 times the mass of Earth. Europa (Jupiter II), the second of the four Galilean moons, is the second closest to Jupiter and the smallest at 3121.6 kilometers in ... Callisto has long been considered the most suitable place for a human base for future exploration of the Jupiter system since it is furthest from the intense radiation of Jupiter. The German astronomer Simon Marius claimed to have seen the moons around the same time, but he did not publish his observations and so Galileo is given the credit for their discovery. Amalthea is named after a naiad who nursed the newborn Jupiter (Zeus). More › Critical Science Targets Io is the most volcanically active body in the solar system. 5. They are in order from the closest to the furthest away from Jupiter. Discovered: 1892; Diameter: 167 km; Orbital Period: 11 hours 57 minutes; Mass: 208 × 10 16 kg; Surface Temperature: 120K; Surface Gravity: 0.020 m/s 2; 4] Thebe. Amalthea is the third closest moon to Jupiter and was the fifth moon of the Jupiter to be discovered. A List of Jupiter's Moons Here is a list of all the named moons of Jupiter. From nearest to Jupiter to farthest, the four Galilean moons are: Io , a red-orange sulphuric hell-hole of a world, where volcanos spray molten lava high into space. This list is just the ones that are "lucky" enough to have been named. Located at a distance of 778 million km or 5.2 AU, it is two and half times larger than all other planets of the solar system combined. Jupiter has 53 named moons and another 26 awaiting official names. Io shouldn’t have a molten core– it’s too small– but the gravitational push and pull of Jupiter kneads the core of this small world, and keeps it perpetually active. Jupiter. Although the planet has 39 moons that we know about, not all of them have names yet. NASA observes that main group (Galilean Moons) consists of some of the largest bodies in the solar system besides the sun and planets. It has a thin atmosphere and consists of two moons revolving around it, Phobos and Deimos. There are many interesting moons orbiting the planet, but the ones of most scientific interest are the first four moons discovered beyond Earth—the Galilean satellites. The inner satellites (the Amalthea Group) orbit nearest to Jupiter and are responsible for replenishing and maintaining Jupiter’s ring system. It was discovered in 1892 by Edward Emerson Barnard. Combined, scientists now think Jupiter has 79 moons. 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