Gridr (satelit)

Gridr
Penemuan^[1]
Ditemukan oleh	Sheppard et al.
Tanggal penemuan	2019
Penamaan
Asal nama	Gríðr
Nama alternatif	Saturnus LIV S/2004 S 20 S2423b^[2]
Ciri-ciri orbit^[2]
Sumbu semimayor	19.211.000 km
Eksentrisitas	0,204
Periode orbit	−990,23 hari
Inklinasi	163,1°
Satelit dari	Saturnus
Ciri-ciri fisik
Diameter rata-rata	4+50% −30% km
Magnitudo semu	25,0

Gridr (Saturnus LIV), penamaan sementara S/2004 S 20, adalah satelit alami planet Saturnus. Penemuannya diumumkan oleh Scott S. Sheppard, David C. Jewitt, dan Jan Kleyna pada tanggal 7 Oktober 2019 dari pengamatan yang dilakukan antara tanggal 12 Desember 2004 dan 22 Maret 2007.^[3] Satelit ini diberikan penamaan permanen pada Juni 2021.^[4] Pada tanggal 24 Agustus 2022, satelit ini resmi dinamakan menurut nama seorang jotun dalam mitologi Nordik, Gríðr.^[5]

Gridr memiliki diameter sekitar 4 kilometer dan mengorbit Saturnus dari jarak rata-rata 19.418 Gm selama 1.010,55 hari, pada inklinasi 163° terhadap ekliptika, dalam arah retrograde dengan eksentrisitas 0,197.^[3]

Referensi

^ "Planetary Satellite Discovery Circumstances". JPL. Diarsipkan dari versi asli tanggal 2017-01-12. Diakses tanggal 31 Juli 2020.
^ ^a ^b "Scott S. Sheppard, Moons of Saturn". Cargenie Science. 2019. Diarsipkan dari versi asli tanggal 2019-04-24. Diakses tanggal 31 Juli 2020.
^ ^a ^b "MPEC 2019-T126 : S/2004 S 20". minorplanetcenter.net. Diarsipkan dari versi asli tanggal 2021-01-23. Diakses tanggal 31 Juli 2020.
^ "M.P.C. 132212" (PDF). Minor Planet Center. International Astronomical Union. 1 Juni 2021. Diarsipkan (PDF) dari versi asli tanggal 2021-06-16. Diakses tanggal 16 Juni 2021.
^ "Names Approved for 10 Small Satellites of Saturn". usgs.gov. USGS. 24 Agustus 2022. Diarsipkan dari versi asli tanggal 2022-08-25. Diakses tanggal 30 Agustus 2022.

l b s Satelit Saturnus
Diurutkan berdasarkan jarak yang paling dekat dari Saturnus
Penggembala cincin	S/2009 S 1 Satelit minor pada cincin Pan Daphnis Atlas Prometheus Pandora
Ko-orbit	Epimetheus Janus
Cincin G	Aegaeon
Alkyonides	Methone Anthe Pallene
Satelit besar bagian dalam (dengan troya)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Satelit besar bagian luar	Rhea Titan Hyperion Iapetus
Kelompok Inuit (8)	S/2019 S 1 Kiviuq Ijiraq Paaliaq Saturnus LX S/2004 S 31 Tarqeq Siarnaq
Kelompok Norse (46)	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13 Hyrrokkin Greip Mundilfari S/2006 S 1 S/2007 S 3 Gridr Bergelmir Narvi Jarnsaxa S/2004 S 17 Suttungr Eggther Hati S/2004 S 12 Bestla Farbauti Thrymr Angrboda Beli Aegir Gerd S/2004 S 7 Gunnlod Skrymir S/2004 S 28 Alvaldi Kari Geirrod S/2006 S 3 Fenrir Surtur Loge Ymir S/2004 S 21 S/2004 S 39 S/2004 S 36 Thiazzi Saturnus LXIV Fornjot Saturnus LVIII
Kelompok Gallic (4)	Albiorix Bebhionn Erriapus Tarvos
Satelit bagian luar prograde	S/2004 S 24
Cincin Saturnus Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 Dalam fiksi

l b s Saturnus
Geografi	Bintik Putih Raksasa Heksagon Magnetosfer Sistem cincin
Satelit alami	S/2009 S 1 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
Astronomi	Delta Octantis Planet minor yang melintasi orbit Saturnus
Penjelajahan	Cassini–Huygens (Huygens) Pioneer 11 Program Voyager Voyager 1 Voyager 2
Terkait	Fiksi

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