 Hyrrokkin imaged by theCassini spacecraft in March 2013 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard David C. Jewitt Jan T. Kleyna Brian G. Marsden |
| Discovery date | December 2004 |
| Designations | |
Designation | Saturn XLIV |
| Pronunciation | /hɪˈrɒkən/ |
Named after | Hyrrokkin |
| S/2004 S 19 | |
| Orbital characteristics[1] | |
| 18437000 km | |
| Eccentricity | 0.3 |
| −931.8 days | |
| Inclination | 151° |
| Satellite of | Saturn |
| Group | Norse group |
| Physical characteristics[2][3] | |
| 8+50% −30% km | |
| 12.76±0.03 h | |
| Albedo | 0.06 (assumed) |
Spectral type | g – r = 0.50 ± 0.08, r – i = 0.34 ± 0.09[4] |
| 23.5 | |
| 14.3 | |
Hyrrokkin orSaturn XLIV is anatural satellite of Saturn. Its discovery was announced byScott S. Sheppard,David C. Jewitt,Jan Kleyna, andBrian G. Marsden on June 26, 2006, from observations taken between December 12, 2004, and April 30, 2006.
Hyrrokkin is about 8 kilometres in diameter,[5] and orbits Saturn at an average distance of 18,168 Mm in 914 days, at aninclination of 153° to theecliptic (154° to Saturn's equator), in aretrograde direction and with aneccentricity of 0.3582. During four observations in March 2013, the synodic rotational period was measured by theCassini spacecraft to approximately 12 hours and 45 minutes. The rotation period was later refined to12.76±0.03 hours.[2] Its light curve shows three minima as seen inYmir andSiarnaq, but has one minimum much shallower than the others. The rotation period and orbit are similar toGreip's, with only theinclination being appreciably different, but it is not known whether the moons are closely related to each other.[3]
It was named in April 2007 afterHyrrokkin, a giantess fromNorse mythology, who launchedHringhorni,Baldr's funeral ship. It was originally listed as being spelledHyrokkin, but the spelling was later corrected.
| Geography | |
|---|---|
| Moons | |
| Astronomy | |
| Exploration | |
| Related | |
| Planetary satellites of |    | |
|---|---|---|
| Dwarf planet satellites of | ||
| Minor-planet moons | ||
| Ranked by size | ||
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 | |||||||||
