{"id":10510,"date":"2019-03-31T06:35:53","date_gmt":"2019-03-31T06:35:53","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10510"},"modified":"2019-04-11T16:28:54","modified_gmt":"2019-04-11T16:28:54","slug":"admirez-alignement-betelgeuse-aldebaran-planete-mars","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/31\/admirez-alignement-betelgeuse-aldebaran-planete-mars\/","title":{"rendered":"Admirez l’alignement B\u00e9telgeuse-Ald\u00e9baran-plan\u00e8te Mars"},"content":{"rendered":"

On pouvait admirer trois astres orang\u00e9s align\u00e9s dans la soir\u00e9e du 30 mars : les \u00e9toiles B\u00e9telgeuse et Ald\u00e9baran ainsi que la plan\u00e8te Mars.<\/strong><\/p>\n

Un beau trio orang\u00e9 :<\/h5>\n

Avez-vous regard\u00e9 le ciel au cr\u00e9puscule dans la soir\u00e9e du 30 mars ? En levant la t\u00eate, vous pouviez contempler un joli spectacle. Trois astres orang\u00e9s semblaient pos\u00e9s sur une ligne c\u00e9leste imaginaire. Il s’agissait d’EST en OUEST de B\u00e9telgeuse, Ald\u00e9baran et la plan\u00e8te Mars.<\/p>\n

\"\"<\/a>
Trois astres orang\u00e9s align\u00e9s au cr\u00e9puscule le 30 mars. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Cet alignement c\u00e9leste est visible pour quelques soirs comme vous le constaterez sur la carte interactive propos\u00e9e par Stelvision<\/a> :<\/p>\n

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

D\u00e9couvrons en d\u00e9tail les trois protagonistes de ce spectacle c\u00e9leste. Nous commencerons par la superg\u00e9ante rouge la plus proche de la Terre (500 ann\u00e9es-lumi\u00e8re).<\/p>\n

Rep\u00e9rez tout d’abord les trois \u00e9toiles align\u00e9es du baudrier d’Orion, un peu plus haut que la c\u00e9l\u00e8bre n\u00e9buleuse<\/a> \u00e9ponyme. Remontez ensuite au-dessus et \u00e0 gauche et vous remarquerez la pr\u00e9sence de notre \u00e9toile orang\u00e9e. B\u00e9telgeuse est mille fois plus grande que le Soleil<\/a> et brille cent mille fois plus. Cette d\u00e9bauche d’\u00e9nergie devrait inexorablement d\u00e9boucher sur une explosion en supernova<\/a>.<\/p>\n

\"\"<\/a>
La superg\u00e9ante B\u00e9telgeuse marque l’\u00e9paule du chasseur Orion. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Ald\u00e9baran (Alpha Tauri<\/em>) est une une \u00e9toile g\u00e9ante orang\u00e9e beaucoup plus proche (65 ann\u00e9es-lumi\u00e8re). Elle est appel\u00e9e l’\u0153il du Taureau, la constellation dont elle est l’astre le plus brillant. Si vous l’observez vous aurez l’impression qu’elle fait partie de l’amas des Hyades<\/a>. Ce dernier est en r\u00e9alit\u00e9 deux fois plus \u00e9loign\u00e9.<\/p>\n

Nous arrivons \u00e0 Mars, la plan\u00e8te ch\u00e8re \u00e0 Camille Flammarion<\/a> et Percival Lowell<\/a>. Actuellement la quatri\u00e8me plan\u00e8te du Syst\u00e8me solaire s’\u00e9loigne et son diam\u00e8tre apparent est inf\u00e9rieur \u00e0 5 secondes d’arc. La regarder dans une longue-vue<\/a> vous exposera \u00e0 une d\u00e9ception certaine. Par contre le spectacle est ravissant dans une paire de jumelles avec l’amas des Pl\u00e9iades<\/a> juste \u00e0 c\u00f4t\u00e9.<\/p>\n

\"\"<\/a>
L’amas des Pl\u00e9iades est un tr\u00e8s joli groupe d’\u00e9toiles. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n
Une m\u00eame couleur, deux origine :<\/h5>\n

La couleur de B\u00e9telgeuse et Ald\u00e9baran s’explique par la temp\u00e9rature de leur surface. Pour Mars, c’est la pr\u00e9sence d’oxyde de fer qui est responsable de son aspect orang\u00e9, d’o\u00f9 son surnom de Plan\u00e8te rouge.<\/p>\n","protected":false},"excerpt":{"rendered":"

On pouvait admirer trois astres orang\u00e9s align\u00e9s dans la soir\u00e9e du 30 mars : les \u00e9toiles B\u00e9telgeuse et Ald\u00e9baran ainsi que la plan\u00e8te Mars. Un beau trio orang\u00e9 : Avez-vous regard\u00e9 le ciel au cr\u00e9puscule dans la soir\u00e9e du 30 mars ? En levant la t\u00eate, vous pouviez contempler un joli spectacle. Trois astres orang\u00e9s … Continuer la lecture de Admirez l’alignement B\u00e9telgeuse-Ald\u00e9baran-plan\u00e8te Mars<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10511,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[373,344,354,132,116],"class_list":["post-10510","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aldebaran","tag-betelgeuse","tag-constellation-dorion","tag-constellation-du-taureau","tag-mars"],"yoast_head":"\nAdmirez l'alignement B\u00e9telgeuse-Ald\u00e9baran-plan\u00e8te Mars<\/title>\n<meta name=\"description\" content=\"On pouvait admirer trois astres orang\u00e9s align\u00e9s dans la soir\u00e9e du 30 mars : les \u00e9toiles B\u00e9telgeuse et Ald\u00e9baran ainsi que la plan\u00e8te Mars.\" \/>\n<meta name=\"robots\" content=\"index, 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