Thrymr (moon)

Brett Gladman et al.

Thrymr ( Saturn XXX) is one of the smaller outer moons of the planet Saturn.

Discovery

The discovery of Thrymr by a team consisting of Brett Gladman, John J. Kavelaars, Jean -Marc Petit, Hans Scholl, Matthew J. Holman, Brian G. Marsden, Philip D. Nicholson, Joseph A. Burns on recordings from September 23 until 27 November 2000, it was announced on 7 December 2000.

Thrymr first received the provisional designation S/2000 S 7 was named after the moon Thrymr, a frost giant from Norse mythology.

Often the name Thrym is used for the moon, this name was also initially published. However, the Working Group for Planetary System Nomenclature ( WGPSN ) of the International Astronomical Union ( IAU) decided later to use the original Norse spelling.

Path data

Thrymr orbiting Saturn on an eccentric orbit at an average distance of 20.219 million kilometers in 1091 days and 18 hours. The orbital eccentricity is 0.3336. The track is 175.815 ° inclined to the ecliptic and is retrograde so, that is, the moon runs opposite to the direction of rotation of Saturn around the planet.

Structure and physical data

Thrymr has a diameter of only 5.6 km. Its density is 2.3 g/m3 compared to the other Saturn moons relatively high. He is probably composed of water ice with a high proportion of silicate rock. He has a very dark surface with an albedo of 0.06, that is, only 6% of the incident sunlight is reflected.

With an apparent magnitude of 23.9 m, it is an extremely light faint object.

Thrymr may be a fragment of Saturn's moon Phoebe, which was blown off with a impact event.

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