Astronomy:Gerd (moon)

From HandWiki
Short description: Moon of Saturn
Gerd
Discovery[1]
Discovered bySheppard et al.
Discovery date2019
Designations
Named afterGerðr
Saturn LVII
S/2004 S 25
S8631e[2]
Orbital characteristics[2]
20544500 km
Eccentricity0.457
Orbital period−1095.0 days
Inclination173.3°
Satellite ofSaturn
GroupNorse group
Physical characteristics
Mean diameter4+50%
−30%
 km
Apparent magnitude25.2


Gerd (Saturn LVII), provisionally known as S/2004 S 25, is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, and Jan Kleyna on October 7, 2019 from observations taken between December 12, 2004 and March 22, 2007.[3] It was given its permanent designation in August 2021.[4] On 24 August 2022, it was officially named after Gerðr, a jötunn from Norse mythology.[5] She is married to Freyr and the personification of fertile soil.[6]

Gerd is about 4 kilometres in diameter, and orbits Saturn at an average distance of 21.174 Gm in 1150.69 days, at an inclination of 173° to the ecliptic, in a retrograde direction and with an eccentricity of 0.442.[3]

References