Geirrod (moon)
Geirrod (Saturn LXVI), provisionally known as S/2004 S 38, is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, and Jan Kleyna on October 8, 2019 from observations taken between December 12, 2004 and March 22, 2007. It was given its permanent designation in August 2021. On 24 August 2022, it was officially named after Geirröðr, a jötunn from Norse mythology. He is an enemy of Thor and is killed by him.
| Discovery | |
|---|---|
| Discovered by | Sheppard et al. |
| Discovery date | 2019 |
| Designations | |
Named after | Geirröðr |
Alternative names | Saturn LXVI S/2004 S 38 S8568a |
| Orbital characteristics | |
Semi-major axis | 23006200 km |
| Eccentricity | 0.381 |
Orbital period (sidereal) | −1295.8 days |
| Inclination | 155.0° |
| Satellite of | Saturn |
| Group | Norse group |
| Physical characteristics | |
Mean diameter | 4+50% −30% km |
| 25.1 | |
Geirrod is about 4 kilometres in diameter, and orbits Saturn at an average distance of 21.908 Gm in 1,211.02 days, at an inclination of 154° to the ecliptic, in a retrograde direction and with an eccentricity of 0.437.
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