Enceladus
Natural satellite orbiting Saturn / From Wikipedia, the free encyclopedia
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Enceladus is the sixth-largest moon of Saturn and the 19th-largest in the Solar System. It is about 500 kilometers (310 miles) in diameter,[5] about a tenth of that of Saturn's largest moon, Titan. It is mostly covered by fresh, clean ice, making it one of the most reflective bodies of the Solar System. Consequently, its surface temperature at noon reaches only −198 °C (75.1 K; −324.4 °F), far colder than a light-absorbing body would be. Despite its small size, Enceladus has a wide variety of surface features, ranging from old, heavily cratered regions to young, tectonically deformed terrain.
Discovery | |||||||||||||
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Discovered by | William Herschel | ||||||||||||
Discovery date | August 28, 1789[1] | ||||||||||||
Designations | |||||||||||||
Designation | Saturn II | ||||||||||||
Pronunciation | /ɛnˈsɛlədəs/[2] | ||||||||||||
Named after | Ἐγκέλαδος Egkelados | ||||||||||||
Adjectives | Enceladean /ɛnsəˈleɪdiən/[3][4] | ||||||||||||
Orbital characteristics | |||||||||||||
237948 km[5] | |||||||||||||
Eccentricity | 0.0047[5][6] | ||||||||||||
1.370218 d[5] | |||||||||||||
Inclination | 0.009° (to Saturn's equator)[5] | ||||||||||||
Satellite of | Saturn | ||||||||||||
Physical characteristics | |||||||||||||
Dimensions | 513.2 × 502.8 × 496.6 km[5][7] | ||||||||||||
Mean radius | 252.1±0.2 km[7][8] (0.0395 Earths, 0.1451 Moons) | ||||||||||||
Mass | (1.080318±0.00028)×1020 kg[8] (1.8×10−5 Earths) | ||||||||||||
Mean density | 1.6097±0.0038 g/cm3[8] | ||||||||||||
0.113 m/s2 (0.0116 g) | |||||||||||||
0.3305±0.0025[9] | |||||||||||||
0.239 km/s (860.4 km/h)[5] | |||||||||||||
Synchronous | |||||||||||||
0 | |||||||||||||
Albedo | 1.375±0.008 (geometric at 550 nm)[10] or 0.81±0.04 (Bond)[11] | ||||||||||||
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11.7[13] | |||||||||||||
Atmosphere | |||||||||||||
Surface pressure | Trace, significant spatial variability[14][15] | ||||||||||||
Composition by volume | 91% water vapor 4% nitrogen 3.2% carbon dioxide 1.7% methane[16] |
Enceladus was discovered on August 28, 1789, by William Herschel,[1][17][18] but little was known about it until the two Voyager spacecrafts, Voyager 1 and Voyager 2, flew by Saturn in 1980 and 1981.[19] In 2005, the spacecraft Cassini started multiple close flybys of Enceladus, revealing its surface and environment in greater detail. In particular, Cassini discovered water-rich plumes venting from the south polar region.[20] Cryovolcanoes near the south pole shoot geyser-like jets of water vapor, molecular hydrogen, other volatiles, and solid material, including sodium chloride crystals and ice particles, into space, totaling about 200 kilograms (440 pounds) per second.[15][19][21] More than 100 geysers have been identified.[22] Some of the water vapor falls back as "snow"; the rest escapes and supplies most of the material making up Saturn's E ring.[23][24] According to NASA scientists, the plumes are similar in composition to comets.[25] In 2014, NASA reported that Cassini had found evidence for a large south polar subsurface ocean of liquid water with a thickness of around 10 km (6 mi).[26][27][28] The existence of Enceladus' subsurface ocean has since been mathematically modelled and replicated.[29]
These observations of active cryoeruptions, along with the finding of escaping internal heat and very few (if any) impact craters in the south polar region, show that Enceladus is currently geologically active. Like many other satellites in the extensive systems of the giant planets, Enceladus participates in an orbital resonance. Its resonance with Dione excites its orbital eccentricity, which is damped by tidal forces, tidally heating its interior and driving the geological activity.[30]
Cassini performed chemical analysis of Enceladus's plumes, finding evidence for hydrothermal activity,[31][32] possibly driving complex chemistry.[33] Ongoing research on Cassini data suggests that Enceladus's hydrothermal environment could be habitable to some of Earth's hydrothermal vent's microorganisms, and that plume-found methane could be produced by such organisms.[34][35]