Astronomy:Gerd (moon)

Gerd
Discovery
Discovered by	Sheppard et al.
Discovery date	2019
Designations
Named after	Gerðr
Alternative names	Saturn LVII; S/2004 S 25; S8631e
Orbital characteristics
Semi-major axis	20544500 km
Eccentricity	0.457
Orbital period	−1095.0 days
Inclination	173.3°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	4+50%; −30% km
Apparent magnitude	25.2

Short description: Moon of Saturn

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

↑ Discovery Circumstances from JPL
↑ ^2.0 ^2.1 S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
↑ ^3.0 ^3.1 "MPEC 2019-T132 : S/2004 S 25". https://minorplanetcenter.net/mpec/K19/K19TD2.html. Retrieved 7 October 2019.
↑ "M.P.C. 133821". International Astronomical Union. 10 August 2021. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/2021/MPC_20210810.pdf.
↑ "Names Approved for 10 Small Satellites of Saturn". USGS. 24 August 2022. https://astrogeology.usgs.gov/news/nomenclature/names-approved-for-10-small-satellites-of-saturn.
↑ "Planet and Satellite Names and Discoverers". IAU WGPSN. https://planetarynames.wr.usgs.gov/Page/Planets.

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Original source: https://en.wikipedia.org/wiki/Gerd (moon). Read more

[Discoverers_JPL-1] Discovery Circumstances from JPL

[SheppardMoons-2] 2.0 ^2.1 S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line

[announcement-3] 3.0 ^3.1 "MPEC 2019-T132 : S/2004 S 25". https://minorplanetcenter.net/mpec/K19/K19TD2.html. Retrieved 7 October 2019.

[MPC133821-4] "M.P.C. 133821". International Astronomical Union. 10 August 2021. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/2021/MPC_20210810.pdf.

[5] "Names Approved for 10 Small Satellites of Saturn". USGS. 24 August 2022. https://astrogeology.usgs.gov/news/nomenclature/names-approved-for-10-small-satellites-of-saturn.

[6] "Planet and Satellite Names and Discoverers". IAU WGPSN. https://planetarynames.wr.usgs.gov/Page/Planets.

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v t e Moons of Saturn
Listed in approximately increasing distance from Saturn.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1 S/2004 S 17(?) Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12(?) S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2004 S 22(?) S/2004 S 23(?) S/2004 S 25(?) S/2004 S 32(?) S/2006 S 3 S/2004 S 38(?) Fenrir S/2004 S 28(?) Surtur Kari S/2004 S 35(?) Ymir S/2004 S 21(?) Loge S/2004 S 36(?) S/2004 S 39(?) S/2004 S 33(?) S/2004 S 34(?) Fornjot S/2004 S 26(?)
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

v t e Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

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Discovery^[1]
Discovered by	Sheppard et al.
Discovery date	2019
Designations
Named after	Gerðr
Alternative names	Saturn LVII S/2004 S 25 S8631e^[2]
Orbital characteristics ^[2]
Semi-major axis	20544500 km
Eccentricity	0.457
Orbital period	−1095.0 days
Inclination	173.3°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	4+50% −30% km
Apparent magnitude	25.2

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