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Thrymr (pronounced /ˈθrɪmər/ THRIM-ər) or Saturn XXX, is a natural satellite of Saturn. It was discovered by Gladman, et al. in 2000, and given the temporary designation S/2000 S 7.

Thrymr is about 5.6 kilometres in diameter, and orbits Saturn at an average distance of 20,810 Mm in 1120.809 days, at an inclination of 175° to the ecliptic (151° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.453.

Thrymr may have formed from debris knocked off of Phoebe at some point in the past.

Its name comes from Norse mythology, where Thrymr is a Jotun or frost giant.

The name was announced as Thrym in IAU Circular 8177. However, the IAU Working Group on Planetary System Nomenclature later decided to add the nominative case ending -r to the root Thrym.

References

* IAUC 7538: S/2000 S 7, S/2000 S 8, S/2000 S 9 December 7, 2000 (discovery)
* MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 December 19, 2000 (discovery and ephemeris)
* IAUC 8177: Satellites of Jupiter, Saturn, Uranus August 8, 2003 (naming the moon Thrym)
* IAUC 8471: Satellites of Saturn January 21, 2005 (correcting the name)

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