{"id":9569,"date":"2018-08-30T13:12:19","date_gmt":"2018-08-30T13:12:19","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9569"},"modified":"2018-09-12T11:55:59","modified_gmt":"2018-09-12T11:55:59","slug":"suivez-le-passage-de-la-comete-21p-giacobini-zinner","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/08\/30\/suivez-le-passage-de-la-comete-21p-giacobini-zinner\/","title":{"rendered":"Suivez le passage de la com\u00e8te 21P\/Giacobini-Zinner"},"content":{"rendered":"

Attendue au plus pr\u00e8s de la Terre le 10 septembre, la\u00a0com\u00e8te 21P\/Giacobini-Zinner est d\u00e9j\u00e0 visible dans une paire de jumelles.<\/strong><\/p>\n

La com\u00e8te 21P\/Giacobini-Zinner se rapproche actuellement de nous \u00e0 la vitesse vertigineuse de 23 km\/sec. Le 10 septembre prochain elle passera \u00e0 58 millions de km de la Terre (la m\u00eame distance qui nous s\u00e9parait de la plan\u00e8te Mars<\/a> il y a un mois) pour sa plus belle approche depuis 72 ans.<\/p>\n

\"\"<\/a>
La com\u00e8te 21P\/Giacobini-Zinner photographi\u00e9e le 17 ao\u00fbt. \u00a9 Alexander Vasenin<\/figcaption><\/figure>\n

En attendant la com\u00e8te Wirtanen qui pourrait devenir visible \u00e0 l’\u0153il nu \u00e0 la fin de l’ann\u00e9e, les astronomes<\/a> pointent actuellement leurs t\u00e9lescopes vers celle que l’on surnomme simplement 21P. Quel est donc cet astre chevelu ?\u00a0<\/p>\n

21P\/Giacobini-Zinner a \u00e9t\u00e9 d\u00e9couverte par l’astronome fran\u00e7ais Michel Giacobini (1873-1938) dans la constellation du Verseau \u00e0 l’Observatoire de Nice<\/a> le 20 d\u00e9cembre 1900. Deux orbites plus tard, la com\u00e8te a \u00e9t\u00e9 retrouv\u00e9e par l’astronome et historien allemand Ernst Zinner (1886-1970) le 23 octobre 1913, d’o\u00f9 le nom commun. Quant au \u00abP\u00bb, il signifie que cet astre chevelu revient p\u00e9riodiquement, tous les 6.62 ans.<\/p>\n

\"\"<\/a>
Trajectoire de la com\u00e8te 21P dans le Syst\u00e8me solaire. \u00a9\u00a0Northolt Branch Observatories<\/figcaption><\/figure>\n

Le point le plus proche de cette orbite se situe \u00e0 1.038 unit\u00e9 astronomique (UA) du Soleil<\/a> et le plus \u00e9loign\u00e9 \u00e0 6.014 UA, au-del\u00e0 de l’orbite de Jupiter<\/a>. En septembre 1985 la sonde spatiale International Cometary Explorer<\/em> avait travers\u00e9 la queue de plasma de cette com\u00e8te qui est \u00e0 l’origine de la pluie de m\u00e9t\u00e9ores des Draconides (appel\u00e9es aussi les Giacobinides).<\/p>\n

\"\"<\/a>
Trajectoire la la com\u00e8te 21P. \u00a9 Astronomy Now<\/figcaption><\/figure>\n

Visible actuellement avec une magnitude<\/a> de 8, la com\u00e8te traverse la constellation du Cocher<\/a> qui se l\u00e8ve peu apr\u00e8s minuit. C’est l\u00e0 qu’il faudra la rechercher aux jumelles<\/a> au d\u00e9but du mois de septembre, quand la Lune<\/a> sera absente de cette r\u00e9gion du ciel. Entre le 2 et le 4 septembre il suffira de pointer l’\u00e9toile Capella (onzi\u00e8me \u00e9toile la plus brillante du ciel et troisi\u00e8me dans l\u2019h\u00e9misph\u00e8re nord apr\u00e8s Sirius<\/a> et Arcturus<\/a>) pour retrouver l’astre chevelu. Dans les grands t\u00e9lescopes et sur les photographies, la com\u00e8te pr\u00e9sente actuellement une chevelure d’environ 1,5 minute d’arc avec une condensation centrale lumineuse et une\u00a0queue de poussi\u00e8re d’au moins 8 minutes d’arc, le quart du diam\u00e8tre apparent lunaire.<\/p>\n","protected":false},"excerpt":{"rendered":"

Attendue au plus pr\u00e8s de la Terre le 10 septembre, la\u00a0com\u00e8te 21P\/Giacobini-Zinner est d\u00e9j\u00e0 visible dans une paire de jumelles. La com\u00e8te 21P\/Giacobini-Zinner se rapproche actuellement de nous \u00e0 la vitesse vertigineuse de 23 km\/sec. Le 10 septembre prochain elle passera \u00e0 58 millions de km de la Terre (la m\u00eame distance qui nous s\u00e9parait … Continuer la lecture de Suivez le passage de la com\u00e8te 21P\/Giacobini-Zinner<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9570,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1853,2561,2332,2562,2563],"class_list":["post-9569","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-capella","tag-comete-21p-giacobini-zinner","tag-constellation-du-cocher","tag-draconides","tag-giacobinides"],"yoast_head":"\nSuivez le passage de la com\u00e8te 21P\/Giacobini-Zinner<\/title>\n<meta name=\"description\" content=\"Attendue au plus pr\u00e8s de la Terre le 10 septembre, la\u00a0com\u00e8te 21P\/Giacobini-Zinner est d\u00e9j\u00e0 visible dans une 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