Key facts
- Discovery site
- Subaru , Gemini , Jan T. Kleyna , Brian G. Marsden
- Designation
- Saturn XLI
- Pronunciation
- / ˈ f ɛ n r ɪər / or / ˈ f ɛ n r ər /
- Named after
- Fenrir
- Alternative names
- S/2004 S 16
- Adjectives
- Fenrian / ˈ f ɛ n r i ə n /
- Semi major axis
- 22 454 000 km
- Orbital period sidereal
- 1260.35 d (3.45 yr )
- Mean anomaly
- 146.614°
- Inclination
- 164.955°
- Longitude of ascending node
- 330.95°
- Argument of perihelion
- 120.264°
- Satellite of
- Saturn
- Group
- Norse group
- Mean diameter
- 4 km
- Albedo
- 0.06 (assumed)
via Wikipedia infobox
Wikidata facts
- Radius
- 2
- Orbital period
- 1260.35
Show 9 more facts
- time of discovery or invention
- 2004-12-13
- provisional designation
- S/2004 S 16
- orbital inclination
- 164.955
- orbital eccentricity
- 0.1363
- apparent magnitude
- 25.0
- semi-major axis of an orbit
- 22610716
- albedo
- 0.040
- mean anomaly
- 146.614
- Commons category
- Fenrir (moon)
via Wikidata · CC0
~2 min read
Article
Fenrir /ˈfɛnrɪər/, or Saturn XLI (provisional designation S/2004 S 16), is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 4, 2005, from observations taken between December 13, 2004, and March 5, 2005. Fenrir has an apparent magnitude of 25, making it one of the faintest known moons in the Solar System, and was discovered using some of the largest telescopes in the world. It is even too dark to have been observed by the Cassini spacecraft when it was in orbit around Saturn, for which it never got brighter than approximately 17th apparent magnitude. Fenrir was named after Fenrir, a giant wolf from Norse mythology, father of Hati and Skoll, son of Loki, destined to break its bonds for Ragnarök.
Fenrir is about 4 kilometres in diameter, and orbits Saturn at an average distance of 22,454 Mm in 1260 days, at an inclination of 163° to the ecliptic (143° to Saturn's equator) with an eccentricity of 0.136. The Fenrian orbit is retrograde: it orbits Saturn in a direction opposite to the planet's spin, suggesting that this irregular moon was captured by Saturn.