Greip or Saturn LI (provisional designation S/2006 S 4) is a moon of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on June 26, 2006, from observations taken between January 5 and May 1, 2006.
Greip is about 6 kilometres in diameter, and orbits Saturn at an average distance of 18,066,000 km in 906.556 days, at an inclination of 172.7° to the ecliptic (159.2° to Saturn's equator), and with an eccentricity of 0.3735.
It is named after Greip, a giantess (female giant) in Norse mythology.
- Institute for Astronomy Saturn Satellite Data
- IAUC 8727: Satellites of Saturn 2006 June 30 (discovery)
- MPEC 2006-M45: Eight New Satellites of Saturn 2006 June 26 (discovery and ephemeris)
- IAUC 8873: Satellites of Saturn (subscription-only) 2007 September 20 (naming)
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