Astronomy:Gridr (moon)

Gridr
Discovery
Discovered by	Sheppard et al.
Discovery date	2019
Designations
Named after	Gríðr
Alternative names	Saturn LIV; S/2004 S 20; S2423b
Orbital characteristics
Semi-major axis	19211000 km
Eccentricity	0.204
Orbital period	−990.23 days
Inclination	163.1°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	4+50%; −30% km
Apparent magnitude	25.0

Short description: Moon of Saturn

Gridr (Saturn LIV), originally known as S/2004 S 20, 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 June 2021.^[4] On 24 August 2022, it was officially named after Gríðr, a jötunn in Norse mythology.^[5] She is the mother of Víðarr the silent and the consort of Odin. She warned Thor about the treachery of Geirröðr and equipped him with her belt of strength, her iron glove, and her staff Gríðarvöl (Gríðr's-staff).^[6]

Gridr is about 4 kilometres in diameter, and orbits Saturn at an average distance of 19.418 Gm in 1010.55 days, at an inclination of 163° to the ecliptic, in a retrograde direction and with an eccentricity of 0.197.^[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-T126 : S/2004 S 20". https://minorplanetcenter.net/mpec/K19/K19TC6.html. Retrieved 7 October 2019.
↑ "M.P.C. 132212". International Astronomical Union. 1 June 2021. https://minorplanetcenter.net/iau/ECS/MPCArchive/2021/MPC_20210601.pdf#page=1628.
↑ "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.
↑ Lindow, John (2002). Norse Mythology: A Guide to Gods, Heroes, Rituals, and Beliefs. Oxford University Press. p. 149. ISBN 978-0-19-983969-8. https://books.google.com/books?id=KlT7tv3eMSwC.

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Original source: https://en.wikipedia.org/wiki/Gridr (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-T126 : S/2004 S 20". https://minorplanetcenter.net/mpec/K19/K19TC6.html. Retrieved 7 October 2019.

[MPC132212-4] "M.P.C. 132212". International Astronomical Union. 1 June 2021. https://minorplanetcenter.net/iau/ECS/MPCArchive/2021/MPC_20210601.pdf#page=1628.

[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] Lindow, John (2002). Norse Mythology: A Guide to Gods, Heroes, Rituals, and Beliefs. Oxford University Press. p. 149. ISBN 978-0-19-983969-8. https://books.google.com/books?id=KlT7tv3eMSwC.

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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	Gríðr
Alternative names	Saturn LIV S/2004 S 20 S2423b^[2]
Orbital characteristics ^[2]
Semi-major axis	19211000 km
Eccentricity	0.204
Orbital period	−990.23 days
Inclination	163.1°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	4+50% −30% km
Apparent magnitude	25.0

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