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Satellite Statistics

Satellite Mean distance from planet (miles) Maximum diameter (miles) Orbital period (days) density (g/cm3)

Metis 79,510 25 0.295 ?
Adrastea 80,140 15 0.298 ?
Amalthea 112,700 170 0.49 ?
Thebe 137,900 60 0.68 ?
Io 262,000 2,260 1.8 3.57
Europa 416,900 1,950 3.6 2.97
Ganymede 664,900 3,270 7.2 1.94
Callisto 1,170,000 2,980 16.7 1.86
Leda 6,893,000 10 238.7 ?
Himalia 7,133,000 110 250.6 ?
Lysithea 7,282,000 25 259.2 ?
Elara 7,293,000 50 259.7 ?
Ananke 13,170,000 20 631 ?
Carme 14,000,000 25 692 ?
Pasiphae 14,600,000 45 735 ?
Sinope 14,700,000 25 758 ?

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Amalthea

Amalthea was discovered by E Barnard in 1872. Of the 17 moons it is the 3rd closest to Jupiter, with a standoff distance of 181,300 km. Amalthea is about the size of a county or small state, and is just...more

Callisto

Callisto was first discovered by Galileo in 1610, making it one of the Galilean Satellites. Of the 60 moons it is the 8th closest to Jupiter, with a standoff distance of 1,070,000 km. It is the 2nd largest...more

Evolution of Callisto

The insides of most of the moons and planets separated while they were forming out of the primitive solar nebula. Measurements by the Galileo spacecraft have been shown that Callisto is the same inside...more

Very Large Impact Crater

Many examples of the differing types of surface are shown in this image. In the foreground is a huge impact crater, which extends for almost an entire hemisphere on the surface. This crater may be compared...more

Surface of Callisto

The surface of Callisto is deeply pockmarked with craters. It looks to be perhaps the most severely cratered body in the solar system. There are also very large craters to be found there. The severity...more

Europa

Europa was first discovered by Galileo in 1610, making it one of the Galilean Satellites. It is Jupiter's 4th largest moon, 670,900 km from Jupiter. With a diameter that is about half the distance across...more

The Atmosphere of Europa

The Galileo mission discovered something amazing! Europa has its own atmosphere, although it is very, very thin. This atmosphere is created when fast moving molecules in Jupiter's magnetosphere hit the...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA