Mundilfari (moon)

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 18,5903 Mm in 952.95 days, at an inclination of 168.4° to the ecliptic, in a retrograde direction and with an eccentricity of 0.210.

Mundilfari may have formed from debris knocked off Phoebe by large impacts at some point in the Solar System's history. With a spectral slope of −5.0%/100, Mundilfari is the bluest of all the moons studied by Grav and Bauer (2007), slightly more so than Phoebe (−2.5%/100 nm) and about as blue as Erriapus (+5.1%/100 nm) is red. Its rotation period is $18,590,300 km$ hours, the second-fastest among all the irregular moons studied by Cassini–Huygens after Hati, and it appears to be very elongated in shape.

It was named in August 2003 from Norse mythology, where Mundilfari is the father of the goddess Sól (Sun) and the god Máni (Moon).