![]() Hyperion in approximately natural color, as photographed by the Cassini spacecraft. Bond-Lassell Dorsum arcs across much of Hyperion's face | |
Discovery | |
---|---|
Discovered by | |
Discovery date | 16 September 1848 |
Designations | |
Designation | Saturn VII |
Pronunciation | /haɪˈpɪəriən/[1][a] |
Named after | Ὑπερίων Hyperīon[a] |
Adjectives | Hyperionian /ˌhɪpəraɪˈoʊniən/[2][3] |
Orbital characteristics | |
1,481,009 km (920,256 mi)[b] | |
Eccentricity | 0.1230061[4] |
21.276 d | |
Inclination | 0.43° (to Saturn's equator)[5][6] |
Satellite of | Saturn |
Physical characteristics | |
Dimensions | 360.2 km × 266.0 km × 205.4 km (223.8 mi × 165.3 mi × 127.6 mi)[7] |
135.00±4.00 km[8] | |
Mass | (5.5510±0.0007)×1018 kg[8] |
Mean density | 0.5386±0.0479 g/cm3[8] |
0.017–0.021 m/s2 depending on location[7] | |
45–99 m/s depending on location.[9] | |
~13 d (chaotic)[10] | |
variable | |
Albedo | 0.3[11] |
Temperature | 93 K (−180 C)[12] |
14.1[13] | |
Hyperion /haɪˈpɪəriən/, also known as Saturn VII, is the eighth-largest moon of Saturn. It distinguished by its highly irregular shape, chaotic rotation, low density, and its unusual sponge-like appearance. It was the first non-rounded moon to be discovered.
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