{"id":2492,"date":"2015-04-30T05:53:30","date_gmt":"2015-04-30T05:53:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2492"},"modified":"2015-05-31T08:01:54","modified_gmt":"2015-05-31T08:01:54","slug":"jupiter-en-compagnie-de-lamas-de-la-creche","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/30\/jupiter-en-compagnie-de-lamas-de-la-creche\/","title":{"rendered":"Jupiter en compagnie de l’amas de la Cr\u00e8che"},"content":{"rendered":"

Quel est cet astre tr\u00e8s brillant qui occupe le sommet de la vo\u00fbte c\u00e9leste d\u00e8s la nuit tomb\u00e9e\u00a0? C’est Jupiter<\/a>, la plus grosse plan\u00e8te du Syst\u00e8me solaire. Elle stationne actuellement dans la constellation du Cancer.<\/p>\n

\"jupiter\"<\/a><\/p>\n

Depuis son passage au plus pr\u00e8s de la Terre le 6 f\u00e9vrier dernier, Jupiter n’a gu\u00e8re perdu de son \u00e9clat. Sa magnitude se situe aux alentours de -2,3 et en l’absence de Lune <\/a>seule V\u00e9nus <\/a>la surpasse en luminosit\u00e9 dans le ciel nocturne.<\/p>\n

Si vous observez Jupiter r\u00e9guli\u00e8rement, vous remarquerez que son d\u00e9placement devant le ciel \u00e9toil\u00e9 s’est modifi\u00e9\u00a0: alors que depuis le mois de d\u00e9cembre la plan\u00e8te avan\u00e7ait d’est en ouest, elle a rebrouss\u00e9 chemin le 8 avril, ce qui la fera revenir dans la constellation du Lion au mois de juin. C’est ce qu’on appelle une boucle de r\u00e9trogradation<\/a>.<\/p>\n

Le mouvement r\u00e9trograde des plan\u00e8tes ext\u00e9rieures \u00e9tait incompr\u00e9hensible \u00e0 l’\u00e9poque du g\u00e9ocentrisme (quand on imaginait que tous les astres tournaient autour de la Terre), mais il trouve son explication dans l’h\u00e9liocentrisme (les plan\u00e8tes tournent autour du Soleil<\/a>)\u00a0: la Terre circulant plus vite sur son orbite que les plan\u00e8tes ext\u00e9rieures, ces derni\u00e8res semblent parfois faire du surplace et m\u00eame reculer devant les \u00e9toiles.<\/p>\n

L’amas de la Cr\u00e8che, 44e objet du catalogue de l’astronome Charles Messier (M 44<\/a>), porte \u00e9galement les noms de Praesepe ou la Ruche. Cet amas ouvert un peu moins spectaculaire que celui des Pl\u00e9iades <\/a>compte un millier d’\u00e9toiles et se situe \u00e0 pr\u00e8s de 600 ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n","protected":false},"excerpt":{"rendered":"

Quel est cet astre tr\u00e8s brillant qui occupe le sommet de la vo\u00fbte c\u00e9leste d\u00e8s la nuit tomb\u00e9e\u00a0? C’est Jupiter, la plus grosse plan\u00e8te du Syst\u00e8me solaire. Elle stationne actuellement dans la constellation du Cancer. Depuis son passage au plus pr\u00e8s de la Terre le 6 f\u00e9vrier dernier, Jupiter n’a gu\u00e8re perdu de son \u00e9clat. … Continuer la lecture de Jupiter en compagnie de l’amas de la Cr\u00e8che<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2493,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[434,438,90,865,114],"class_list":["post-2492","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-amas-de-la-creche","tag-constellation-du-cancer","tag-jupiter","tag-m-44","tag-planete"],"yoast_head":"\nJupiter en compagnie de l'amas de la Cr\u00e8che<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/30\/jupiter-en-compagnie-de-lamas-de-la-creche\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jupiter en compagnie de l'amas de la Cr\u00e8che\" \/>\n<meta property=\"og:description\" content=\"Quel est cet astre tr\u00e8s brillant qui occupe le sommet de la vo\u00fbte c\u00e9leste d\u00e8s la nuit tomb\u00e9e\u00a0? C’est Jupiter, la plus grosse plan\u00e8te du Syst\u00e8me solaire. Elle stationne actuellement dans la constellation du Cancer. 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