| 词条 | Hyrrokkin (moon) |
| 释义 |
Hyrrokkin ({{IPAc-en|h|ɪ|ˈ|r|ɒ|k|ɪ|n}} {{respell|hi|ROK|in}}) or Saturn XLIV (provisional designation S/2004 S 19) is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on June 26, 2006, from observations taken between December 12, 2004, and April 30, 2006. Hyrrokkin is about 8 kilometres in diameter,[1] and orbits Saturn at an average distance of 18,168 Mm in 914 days, at an inclination of 153° to the ecliptic (154° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.36. During four observations in March 2013, the synodic rotational period was measured by the Cassini spacecraft to approximately 12 hours and 45 minutes. It was named in April 2007 after Hyrrokkin, a giantess from Norse mythology, who launched Hringhorni, Baldr's funeral ship. It was originally listed as being spelled Hyrokkin, but the spelling was later corrected. References1. ^{{cite news |last=Rehnberg |first=Morgan |url=http://sen.com/news/cassini-studies-backwards-orbiting-moon-hyrrokkin |title=Cassini studies backwards-orbiting moon Hyrrokkin |work=Space Exploration Network |publisher=SEN |date=14 August 2015 |accessdate=2015-08-17 }} External links
{{Saturn}}{{Solar System moons (compact)}}{{Moons of Saturn|state=uncollapsed}} 3 : Moons of Saturn|Discoveries by Scott S. Sheppard|Astronomical objects discovered in 2006 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。