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Anneau A

L'anneau A est un anneau planétaire situé autour de Saturne, le plus externe des deux anneaux les plus brillants de la planète (l'autre étant l'anneau B).

Caractéristiques

Vue montrant les anneaux A (le plus large) et F (le plus externe). Les deux satellites de Saturne visibles sont Janus et Téthys.

L'anneau A débute à 122 170 km du centre de Saturne et s'étend jusqu'à 136 775 km, compris entre l'anneau B, plus interne et dont il est séparé par la division de Cassini, et l'anneau R/2004 S 1, plus externe. Son épaisseur est estimée entre 10 et 40 mètres, sa masse totale à 6,2×10¹⁸ kilogrammes, soit à peu près celle d'Hypérion.

La limite externe de l'anneau A est déterminée par Atlas, qui joue le rôle d'un satellite berger extérieur.

L'anneau A possède lui-même deux divisions situées près de son bord extérieur. La division d'Encke, à 133 589 km du centre de Saturne, correspond à l'orbite de Pan. La division de Keeler, à 136 530 km, correspond à celle de Daphnis.

Le minimum d'Encke (qui n'a rien à voir avec la division d'Encke, mais qui semble avoir été observé par l'astronome Johann Franz Encke) est une zone plus sombre de l'anneau A située entre 126 430 et 129 940 km.

Bibliographie

Grätz et al. 2019

Voir aussi

Liens internes

Liens externes

(en) Saturnian Rings Fact Sheet (NASA)
(en) Saturn's Ring System' (Planetary Rings Node)

v · m

Système saturnien

Saturne

Atmosphère Magnétosphère
Grandes taches blanches	1876 1903 1933 1960 1990 1994 2006 2010
Autres	Hexagone Tempête du Dragon

Anneaux, divisions et lacunes

Satellites

S/2009 S 1 Pan Daphnis Atlas Prométhée Pandore Épiméthée Janus Égéon Mimas Méthone Anthée Pallène Encelade Téthys Télesto Calypso Dioné Hélène Pollux Rhéa Titan atmosphère Hypérion Japet Kiviuq Ijiraq Phœbé Paaliaq Skathi Albiorix S/2007 S 2 Bebhionn Erriapus Skoll Siarnaq Tarqeq S/2004 S 13 Greip Tarvos Hyrrokkin Mundilfari Narvi Jarnsaxa S/2006 S 1 S/2004 S 17 Bergelmir Ægir Suttungr S/2004 S 12 Bestla Farbauti Hati S/2004 S 7 Thrymr S/2007 S 3 S/2006 S 3 Surtur Kari Fenrir Ymir Loge Fornjot Gridr S/2004 S 21 Angrboda Skrymir S/2004 S 24 Gerd Saturne LVIII Eggther S/2004 S 28 Saturne LX Beli S/2004 S 31 Gunnlod Thiazzi Saturne LXIV Alvaldi S/2004 S 36 S/2004 S 37 Geirröd S/2004 S 39 S/2019 S 1 S/2020 S 1 S/2006 S 9 S/2007 S 5 S/2004 S 40 S/2019 S 2 S/2019 S 3 S/2020 S 2 S/2020 S 3 S/2019 S 4 S/2004 S 41 S/2020 S 4 S/2020 S 5 S/2007 S 6 S/2004 S 42 S/2006 S 10 S/2019 S 5 S/2004 S 43 S/2004 S 44 S/2004 S 45 S/2006 S 11 S/2006 S 12 S/2019 S 6 S/2006 S 13 S/2019 S 7 S/2019 S 8 S/2019 S 9 S/2004 S 46 S/2019 S 10 S/2004 S 47 S/2019 S 11 S/2006 S 14 S/2019 S 12 S/2020 S 6 S/2019 S 13 S/2005 S 4 S/2007 S 7 S/2007 S 8 S/2020 S 7 S/2019 S 14 S/2019 S 15 S/2005 S 5 S/2006 S 15 S/2006 S 16 S/2006 S 17 S/2004 S 48 S/2020 S 8 S/2004 S 49 S/2004 S 50 S/2006 S 18 S/2019 S 16 S/2019 S 17 S/2019 S 18 S/2019 S 19 S/2019 S 20 S/2006 S 19 S/2004 S 51 S/2020 S 9 S/2004 S 52 S/2007 S 9 S/2004 S 53 S/2020 S 10 S/2019 S 21 S/2006 S 20
Non confirmés (possiblement des agrégats de poussière)	S/2004 S 3 S/2004 S 4 S/2004 S 6 S/2001 S 4 S/2001 S 7
Satellites à hélice	~ 150 dont (noms informels) : Blériot Curtiss Earhart Hinkler Kingsford Smith Lindbergh Post Richthofen Santos-Dumont Sikorsky Wright Peggy
Inexistants	Chiron Thémis

Exploration

Programme Voyager
- Voyager 1
- Voyager 2
Cassini-Huygens
- Cassini
- Huygens

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