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Hyperion (moon)
&sq=crain_ford&lang=en&file=File:Hyperion_true.jpg) 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 is 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.
- ^ "Hyperion". Lexico UK English Dictionary. Oxford University Press. Archived from the original on March 22, 2020.
"Hyperion". Merriam-Webster.com Dictionary. Merriam-Webster. - ^ "JPL (ca. 2008) Cassini Equinox Mission: Hyperion". Archived from the original on 2016-04-10. Retrieved 2011-01-30.
- ^ Bill Yenne (1987) The Atlas of the Solar System, p. 144
- ^ Pluto Project pseudo-MPEC for Saturn VII Archived 2006-05-29 at the Wayback Machine
- ^ NASA's Solar System Exploration: Saturn: Moons: Hyperion: Facts & Figures Archived 2004-11-03 at the Wayback Machine
- ^ MIRA's Field Trips to the Stars Internet Education Program: Saturn
- ^ a b Thomas, P. C. (July 2010). "Sizes, shapes, and derived properties of the saturnian satellites after the Cassini nominal mission" (PDF). Icarus. 208 (1): 395–401. Bibcode:2010Icar..208..395T. doi:10.1016/j.icarus.2010.01.025. Archived from the original (PDF) on 2018-12-23. Retrieved 2015-09-04.
- ^ a b c Jacobson, Robert. A. (1 November 2022). "The Orbits of the Main Saturnian Satellites, the Saturnian System Gravity Field, and the Orientation of Saturn's Pole*". The Astronomical Journal. 164 (5): 199. Bibcode:2022AJ....164..199J. doi:10.3847/1538-3881/ac90c9. S2CID 252992162.
- ^ Thomas, P.C.; Armstrong, J. W.; Asmar, S. W.; Burns, J. A.; Denk, T.; Giese, B.; Helfenstein, P.; Iess, L.; et al. (2007). "Hyperion's Sponge-like Appearance". Nature. 448 (7149): 50–56. Bibcode:2007Natur.448...50T. doi:10.1038/nature05779. PMID 17611535. S2CID 4415537.
- ^ "Hyperion In Depth". NASA. Retrieved 2019-02-05.
- ^ D.R. Williams (18 September 2006). "Saturnian Satellite Fact Sheet". NASA. Retrieved 2007-11-04.
- ^ "About Saturn & Its Moons: Moons – Hyperion". Cassini @ JPL/NASA. Archived from the original on 2012-06-04. Retrieved 2011-01-30.
- ^ Cite error: The named reference
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