{"id":7736,"date":"2017-04-22T07:24:34","date_gmt":"2017-04-22T07:24:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7736"},"modified":"2017-05-01T14:17:36","modified_gmt":"2017-05-01T14:17:36","slug":"planete-mars-a-cote-de-lamas-pleiades","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/22\/planete-mars-a-cote-de-lamas-pleiades\/","title":{"rendered":"La plan\u00e8te Mars \u00e0 c\u00f4t\u00e9 de l’amas des Pl\u00e9iades"},"content":{"rendered":"

Une paire de jumelles permet de profiter actuellement du rapprochement apparent entre Mars et l’amas des Pl\u00e9iades au cr\u00e9puscule.<\/strong><\/p>\n

Si Jupiter<\/a> et V\u00e9nus<\/a> brillent intens\u00e9ment (la premi\u00e8re toute la nuit dans la constellation de la Vierge avec une magnitude de -2,4 et la seconde avant l’aube sur l’horizon EST avec une magnitude de -4.6),\u00a0Mars<\/a> fait p\u00e2le figure avec une magnitude de 1,9 ; il faut dire que la Plan\u00e8te rouge s\u2019\u00e9loigne de nous et il faudra attendre l\u2019\u00e9t\u00e9 2018 et la prochaine opposition pour qu\u2019elle retrouve une magnitude n\u00e9gative.<\/p>\n

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

La quatri\u00e8me plan\u00e8te du Syst\u00e8me solaire se fait donc discr\u00e8te mais vous pouvez suivre actuellement son passage dans la constellation du Taureau<\/a>\u00a0en d\u00e9but de soir\u00e9e sur l’horizon OUEST.<\/p>\n

Comme on le voit sur cette image r\u00e9alis\u00e9e le 21 avril (1 pose de 4 sec \u00e0 1.600 iso avec un objectif de 50 mm de focale ouvert \u00e0 2,8), la constellation du Taureau\u00a0est riche de deux beaux amas d\u2019\u00e9toiles espac\u00e9s d\u2019une dizaine de degr\u00e9s, l\u2019amas des Pl\u00e9iades et celui des Hyades.<\/p>\n

Dans la mythologie grecque, les Pl\u00e9iades \u00e9taient les sept filles d\u2019Atlas et de Pl\u00e9ion\u00e9. L\u2019amas porte le nom de Messier 45, la r\u00e9f\u00e9rence de cet objet c\u00e9leste dans le catalogue de l\u2019astronome fran\u00e7ais Charles Messier<\/a> \u00e9tabli au XVIIIe si\u00e8cle.\u00a0Bien qu\u2019\u00e0 l\u2019\u0153il nu seules une douzaine d\u2019\u00e9toiles de l\u2019amas soient visibles, les photographies r\u00e9alis\u00e9es avec de grands t\u00e9lescopes<\/a> ont permis d\u2019en d\u00e9nombrer environ 3.000. Cet objet c\u00e9leste (dans lequel on a d\u00e9couvert des plan\u00e8tes en formation<\/a>) s\u2019\u00e9tend sur une surface apparente de 2\u00b0 dans le ciel, l\u2019\u00e9quivalent de quatre fois la Pleine Lune<\/a>.<\/p>\n

L\u2019amas des Hyades, m\u00eame s\u2019il compte environ dix fois moins d\u2019\u00e9toiles que M 45, est tr\u00e8s int\u00e9ressant \u00e0 observer \u00e9galement car c\u2019est l\u2019amas ouvert le plus proche du Syst\u00e8me solaire (150 ann\u00e9es-lumi\u00e8re). Les astrophysiciens ont remarqu\u00e9 que les \u00e9toiles des Hyades et de l\u2019amas de la Cr\u00e8che (M 44<\/a>), ont des caract\u00e9ristiques communes, preuve qu\u2019elles sont n\u00e9es dans la m\u00eame r\u00e9gion de notre Galaxie<\/a>. Curieusement, l\u2019\u00e9toile la plus brillante des Hyades, Ald\u00e9baran<\/a> (qui repr\u00e9sente l\u2019\u0153il du Taureau), est deux fois plus proche de nous et ne fait donc pas partie de l\u2019amas.<\/p>\n","protected":false},"excerpt":{"rendered":"

Une paire de jumelles permet de profiter actuellement du rapprochement apparent entre Mars et l’amas des Pl\u00e9iades au cr\u00e9puscule. Si Jupiter et V\u00e9nus brillent intens\u00e9ment (la premi\u00e8re toute la nuit dans la constellation de la Vierge avec une magnitude de -2,4 et la seconde avant l’aube sur l’horizon EST avec une magnitude de -4.6),\u00a0Mars fait … Continuer la lecture de La plan\u00e8te Mars \u00e0 c\u00f4t\u00e9 de l’amas des Pl\u00e9iades<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7737,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[373,863,713,133,116,437],"class_list":["post-7736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aldebaran","tag-amas-des-hyades","tag-amas-des-pleiades","tag-charles-messier","tag-mars","tag-messier-45"],"yoast_head":"\nLa plan\u00e8te Mars \u00e0 c\u00f4t\u00e9 de l'amas des Pl\u00e9iades<\/title>\n<meta name=\"description\" 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