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Io (/ ˈ aɪ. oʊ /), or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter.Slightly larger than Earth's moon, Io is the fourth-largest moon in the Solar System, has the highest density of any moon, the strongest surface gravity of any moon, and the lowest amount of water by atomic ratio of any known astronomical object in the Solar System.
Loki Patera on moon Io (artist's concept; 0:18). [1] Map of temperature and crust age of Loki Patera obtained by the Large Binocular Telescope. Loki Patera / ˈ l oʊ k i ˈ p æ t ə r ə / is the largest volcanic depression on Jupiter's moon Io, 202 kilometres (126 mi) in diameter. [2] It contains an active lava lake, with an episodically ...
The largest, Ganymede, is the largest moon in the Solar System and surpasses the planet Mercury in size (though not mass). Callisto is only slightly smaller than Mercury in size; the smaller ones, Io and Europa, are about the size of the Moon. The three inner moons — Io, Europa, and Ganymede — are in a 4:2:1 orbital resonance with
Amaterasu Patera, in a screenshot taken in NASA World Wind.Click to enlarge. Amaterasu Patera is a patera, a complex crater with scalloped edges, on Jupiter's moon Io.It is one of the darkest features on Io, and the measurement of its thermal spectrum (its temperature was estimated in 1979 to be 281 K) helped to support an anticorrelation between albedo and temperature for Ionian hotspots. [1]
Starting with Galileo's first orbit, the spacecraft's camera, the Solid-State Imager (SSI), began taking one or two images per orbit of Io while the moon was in Jupiter's shadow. This allowed Galileo to monitor high-temperature volcanic activity on Io by observing thermal emission sources across its surface. [68]
The atmosphere of Io is the extremely thin blanket of gases surrounding Jupiter's third largest moon Io. The atmosphere is primarily composed of sulfur dioxide (SO 2), along with sulfur monoxide (SO), sodium chloride (NaCl), and monoatomic sulfur and oxygen. [1] Dioxygen is also expected to be present. Auroral glows in Io's upper atmosphere.
A planetary-mass moon is a planetary-mass object ... seven – Ganymede, Titan, Callisto, Io, Earth's Moon, ... along with composition and internal temperature, that ...
Volcanism on Io, a moon of Jupiter, is represented by the presence of volcanoes, volcanic pits and lava flows on the surface. Io's volcanic activity was discovered in 1979 by Linda Morabito, an imaging scientist working on Voyager 1. [1] Observations of Io by passing spacecraft and Earth-based astronomers have revealed more than 150 active ...