 Discovery images of Thrymr (circled) taken by theCFHT in September 2000 | |
| Discovery | |
|---|---|
| Discovery date | 2000 |
| Designations | |
Designation | Saturn XXX |
| Pronunciation | /ˈθrɪmər/THRIM-ər[1] |
Named after | Thrymr |
| S/2000 S 7 | |
| Adjectives | Thrymian (/ˈθrɪmiən/THRIM-ee-ən) |
| Orbital characteristics[2] | |
| 20474000 km | |
| Eccentricity | 0.470 |
| −1094.3 days | |
| Inclination | 176.0° |
| Satellite of | Saturn |
| Group | Norse group |
| Physical characteristics[3][4] | |
| 4+50% −30% km | |
| 38.79±0.25? h | |
| Albedo | 0.06 (assumed) |
Spectral type | C |
| 23.9 | |
| 14.3 | |
Thrymr, orSaturn XXX, is anatural satellite of Saturn. It was discovered byGladman and colleagues in 2000, and given the temporary designationS/2000 S 7. Its name comes fromNorse mythology, whereThrymr is aJotun.
Thrymr is about 8 kilometres in diameter, and orbits Saturn at an average distance of 20,810 Mm in 1120.809 days. It may have formed from debris knocked offPhoebe. The Thrymian orbit isretrograde, at aninclination of 175° to theecliptic (151° to Saturn's equator) and with aneccentricity of 0.453.[3] LikeIjiraq andKiviuq, Thrymr's orbit overlaps strongly with Phoebe's such that it is likely to collide with it in the future.[4]
Its rotation period is38.79±0.25 hours, the slowest among the retrograde moons measured byCassini–Huygens and the second-slowest afterTarqeq.[3] Having two maxima and two minima in itslight curve, it may therefore be acontact binary, although this is less likely than for Kiviuq andBestla.[4] The surface of Thrymr is gray in color and similar to those ofSuttungr andMundilfari, suggesting a common origin as fragments knocked off of Phoebe early in the Solar System's history.[4] In particular, it may be part of the same dynamical family as Suttungr, thoughS/2004 S 7 is probably more closely related.[4]
Its name was announced in itsoblique formThrym inIAU Circular 8177. However, theIAUWorking Group on Planetary System Nomenclature later decided to add thenominative suffix-r to the rootThrym.
Listed in approximate increasing distance from Saturn | |||||||||
| Inner ring moons | |||||||||
| Co-orbitals | |||||||||
| Ring-embedded moons | |||||||||
| Major moons (withtrojans) | |||||||||
| Inuit group (36) |
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| Gallic group (17) | |||||||||
| Norse group (197) |
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| See also | |||||||||
| Geography | |
|---|---|
| Moons | |
| Astronomy | |
| Exploration | |
| Related | |
