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With a diameter of about 5,270 kilometres (3,270 mi) and a mass of 1.48 × 10 20 tonnes (1.48 × 10 23 kg; 3.26 × 10 23 lb), Ganymede is the largest and most massive moon in the Solar System. [45] It is slightly more massive than the second most massive moon, Saturn's satellite Titan , and is more than twice as massive as the Earth's Moon.
Thus, the angular diameter of Earth's orbit around the Sun as viewed from a distance of 1 pc is 2″, as 1 AU is the mean radius of Earth's orbit. The angular diameter of the Sun, from a distance of one light-year, is 0.03″, and that of Earth 0.0003″. The angular diameter 0.03″ of the Sun given above is approximately the same as that of a ...
The main difficulty in observing the moons from Earth is their proximity to Jupiter, since they are obscured by its brightness. [59] The maximum angular separations of the moons are between 2 and 10 arcminutes from Jupiter, [60] which is close to the limit of human visual acuity. Ganymede and Callisto, at their maximum separation, are the ...
The images provide new insights into the chemical composition of two of Jupiter’s moons.
The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [11]
The Earth seen from Apollo 17.jpg FullMoon2010.jpg Ganymede, moon of Jupiter, NASA.jpg: Author: Apollo 17 Picture of the Whole Earth: NASA. Telescopic Image of the Full Moon: Gregory H. Revera Computer-enhanced image of Ganymede: NASA/JPL/DLR
seen from Earth at perihelion maximum brightness of perigee + perihelion + full Moon (~0.267 lux; mean distance value is −12.74, [17] though values are about 0.18 magnitude brighter when including the opposition effect) −12.40: Betelgeuse (when supernova) seen from Earth when it goes supernova [36] −11.20: star Sun: seen from Sedna at ...
For bodies that appear smaller in angular diameter than the Sun, the proper term would be a transit. For bodies that are larger than the apparent size of the Sun, the proper term would be an occultation. There are four satellites capable of completely occulting the Sun: Io, Europa, Ganymede and Callisto. All of the others are too small or too ...