Fenrir (moon)

Fenrir
Provisional or systematic name	S / 2004 S 16
Central body	Saturn
Properties of the orbit
Major semi-axis	22,453,000 km
Periapsis	19,399,000 km
Apoapsis	25,507,000 km
eccentricity	0.136
Orbit inclination	164.9 °
Orbital time	1260.3 d
Mean orbital velocity	1.29 km / s
Physical Properties
Apparent brightness	25.0 mag
Medium diameter	≈ 4 km
Acceleration of gravity on the surface	≈ 0 m / s 2
Escape speed	≈ 0 m / s
discovery
Explorer	David C. Jewitt , Scott S. Sheppard , Jan Kleyna , Brian G. Marsden
Date of discovery	December 13, 2004

Fenrir (also Saturn XLI) is one of the smaller outer moons of the planet Saturn .

discovery

The discovery of Fenrir by David C. Jewitt , Scott S. Sheppard , Jan Kleyna and Brian G. Marsden on recordings from December 13, 2004 to March 5, 2005, was announced on May 3, 2005. Fenrir was initially given the provisional designation S / 2004 S 16. In April 2007 the moon was named after the Fenris wolf , the father of the giant wolves Skalli (also Skoll) and Hati and son of the god Loki , from Norse mythology .

Orbit data

Fenrir orbits Saturn on a retrograde eccentric orbit in around 1260.3 days. The orbit eccentricity is 0.136, with the orbit inclined at 164.9 ° to the ecliptic .

Structure and physical data

Fenrir has a diameter of about 4 km.

Web links

• MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (Discovery and Ephemeris)
• IAUC 8523: New Satellites of Saturn May 4, 2005 (discovery)
• MPEC 2006-C72: S / 2004 S 9, S / 2004 S 16 February 13, 2006 (rediscovery)
• IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (numbering and naming)

further inside	Saturn moons	further outside
Kari	Semi- major axis  (km) Fenrir 22,453,000	Surtur