Hyperion

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Hyperion , in astronomy, one of the named moons, or natural satellites, of Saturn . Also known as Saturn VII (or S7), Hyperion is the largest highly irregular (nonspherical) body in the solar system, measuring about 255 mi (410 km) by 160 mi (260 km) by 135 mi (220 km); it orbits Saturn at a mean distance of 920,310 mi (1,481,100 km) in 21.277 earth days—its rotational period is chaotic. It was discovered in 1848 independently by the American astronomer George Phillips Bond and the English astronomer William Lassell. Hyperion is believed to be composed primarily of water ice with only a small amount of rocky material. However, its low reflectivity suggests that there is at least a thin layer of dark material covering the surface. Hyperion differs from Saturn's other moons in that its surface features are relatively uniform, while the others have distinctly different leading and trailing hemispheres. The largest crater on its surface is c.75 mi (120 km) in diameter and 6 mi (10 km) deep. Hyperion forms a satellite pair with Titan ; that is, the two moons interact gravitationally.

Hyperion, romance by Longfellow, published in 1839. The thin thread of story connects philosophical discourses, romantic legends, literary criticism, and translations of German poetry. The romantic creation is in the mood of Jean Paul Richter, but the events correspond with those of the author's second visit to Europe, from the death of his first wife to his friendship with Frances Appleton, whom he later married.

Hyperion A satellite of Saturn, 1 464 000 km from the planet's centre, orbital period 21.277 days; also known as Saturn VII. It is irregular in shape, measuring 328 × 260 × 214 km. Hyperion was discovered in 1848 by W. C. and G. P.Bond, and independently two days later by W.Lassell. Hyperion's surface is heavily covered with impact craters which show signs of collapse and infilling.

Hyperion (Saturn VII) One of the major satellites of Saturn, with a radius measuring 185 × 140 × 113 km; visual albedo 0.19−0.25. It was discovered in 1848 by W. Bond.

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