|Discovered by||Gladman et al.|
|S/2000 S 9|
|Orbital characteristics |
|18685000 km (18360000 km)|
|−952.6 days (−928.8 days)|
Mundilfari, or Saturn XXV, is a natural satellite of Saturn. It was discovered by Brett J. Gladman, et al. in 2000, and given the temporary designation S/2000 S 9. Mundilfari is about 7 kilometres in diameter, and orbits Saturn at an average distance of 18,360 Mm in 928.806 days, at an inclination of 170° to the ecliptic (150° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.198. Its rotation period is 6.74±0.08 hours.
Mundilfari may have formed from debris knocked off Phoebe by large impacts at some point in the Solar System's history.