{"id":15581,"date":"2022-02-25T18:01:48","date_gmt":"2022-02-25T18:01:48","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15581"},"modified":"2022-03-14T17:09:43","modified_gmt":"2022-03-14T17:09:43","slug":"castor-et-pollux-deux-fausses-jumelles-dans-le-ciel-dhiver","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/25\/castor-et-pollux-deux-fausses-jumelles-dans-le-ciel-dhiver\/","title":{"rendered":"Castor et Pollux, deux fausses jumelles dans le ciel d&#8217;hiver"},"content":{"rendered":"<p><strong>Actuellement post\u00e9es au z\u00e9nith en d\u00e9but de nuit, les fausses jumelles Castor et Pollux sont\u00a0 deux brillantes \u00e9toiles \u00e0 d\u00e9couvrir.\u00a0\u00a0<\/strong><\/p>\n<h5>Dans le prolongement d&#8217;Orion :<\/h5>\n<p>Pour localiser les \u00e9toiles Castor et Pollux (fils jumeaux de Zeus et de L\u00e9da dans la mythologie grecque), vous devez d\u00e9j\u00e0 rep\u00e9rer <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/20\/le-ciel-aux-jumelles-decouvrez-les-beautes-de-la-ceinture-dorion\/\" target=\"_blank\" rel=\"noopener\">Orion<\/a>. La plus belle constellation hivernale est visible plein Sud en d\u00e9but de nuit. Cherchez-la \u00e0 mi-chemin entre l&#8217;horizon et le z\u00e9nith. <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/etoile-geante-rouge-betelgeuse-livre-secrets-79164\/\" target=\"_blank\" rel=\"noopener\">B\u00e9telgeuse<\/a> symbolise l&#8217;\u00e9paule droite du chasseur, Rigel son pied gauche. En prolongeant deux fois une ligne imaginaire qui passe par ces astres, vous arrivez \u00e0 Castor et Pollux.<\/p>\n<figure id=\"attachment_15582\" aria-describedby=\"caption-attachment-15582\" style=\"width: 322px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/orion_chasseur.jpg\" rel=\"lightbox[15581]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15582\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/orion_chasseur-322x450.jpg\" alt=\"\" width=\"322\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/orion_chasseur-322x450.jpg 322w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/orion_chasseur.jpg 418w\" sizes=\"auto, (max-width: 322px) 100vw, 322px\" \/><\/a><figcaption id=\"caption-attachment-15582\" class=\"wp-caption-text\">En prolongeant deux fois une ligne passant par Rigel et B\u00e9telgeuse, vous tomberez sur les \u00e9toiles Castor et Pollux.<\/figcaption><\/figure>\n<p>Ces deux \u00e9toiles proches l&#8217;une de l&#8217;autre en apparence sont \u00e0 l\u2019origine du nom de la constellation des G\u00e9meaux qui les abrite (en latin, \u00ab jumeaux \u00bb se dit <em>Gemini<\/em>). Mais comme vous allez pouvoir le constater, elles sont tr\u00e8s diff\u00e9rentes.<!--more--><\/p>\n<h5>Faux couple stellaire :<\/h5>\n<p>Commen\u00e7ons par tordre le cou \u00e0 une vieille croyance : les \u00e9toiles Castor et Pollux ne sont pas jumelles. Si Castor se trouve \u00e0 50 ann\u00e9es-lumi\u00e8re de nous, Pollux n&#8217;en est qu&#8217;\u00e0 34. Autant dire qu&#8217;elles sont tr\u00e8s \u00e9loign\u00e9es l&#8217;une de l&#8217;autre, m\u00eame si nous les voyons accol\u00e9es.<\/p>\n<figure id=\"attachment_12461\" aria-describedby=\"caption-attachment-12461\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072.jpg\" rel=\"lightbox[15581]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12461\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/DSC_0072.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12461\" class=\"wp-caption-text\">Lorsque ce clich\u00e9 a \u00e9t\u00e9 r\u00e9alis\u00e9 avant l&#8217;aube en septembre 2020 avec la complicit\u00e9 de ma compagne Christine, la Lune se trouvait entre Castor, Pollux et la constellation d&#8217;Orion. La brillante plan\u00e8te V\u00e9nus \u00e9tait \u00e9galement pr\u00e9sente. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Avec leurs t\u00e9lescopes, les astronomes ont cherch\u00e9 depuis longtemps \u00e0 en savoir plus sur ces deux astres. En 1719, l\u2019astronome britannique <a href=\"https:\/\/fr.wikipedia.org\/wiki\/James_Bradley\" target=\"_blank\" rel=\"noopener\">James Bradley<\/a> a \u00e9t\u00e9 le premier \u00e0 remarquer que Castor \u00e9tait une binaire visuelle chaude, de couleur blanche bleut\u00e9e. On a depuis d\u00e9couvert que chacune des composantes de Castor \u00e9tait en fait un couple stellaire, ce qui en fait un syst\u00e8me d\u2019\u00e9toiles quadruple.<\/p>\n<figure id=\"attachment_15583\" aria-describedby=\"caption-attachment-15583\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/castor_pollux2.jpg\" rel=\"lightbox[15581]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15583\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/castor_pollux2-450x255.jpg\" alt=\"\" width=\"450\" height=\"255\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/castor_pollux2-450x255.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/castor_pollux2-768x436.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/castor_pollux2.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15583\" class=\"wp-caption-text\">Les \u00e9toiles Pollux \u00e0 gauche et Castor \u00e0 droite dans les G\u00e9meaux.\u00a9 <a href=\"http:\/\/deepskycolors.com\/deepsky.html\" target=\"_blank\" rel=\"noopener\">Rogelio Bernal Andreo<\/a><\/figcaption><\/figure>\n<p>Quant \u00e0 Pollux, c\u2019est une g\u00e9ante jaune-orang\u00e9e plus froide. Elle est \u00e9galement la plus brillante \u00e9toile connue \u00e0 poss\u00e9der une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/01\/ngts-un-reseau-de-telescopes-pour-traquer-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">exoplan\u00e8te<\/a>, Pollux b, dont la masse \u00e9quivaut \u00e0 un peu plus de 2 fois celle de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/30\/les-saisissantes-images-de-jupiter-prises-par-la-sonde-juno\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>. Pollux b, qui tourne autour de son \u00e9toile en moins de 600 jours, a \u00e9t\u00e9 renomm\u00e9e Thestias par l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/10\/lunion-astronomique-internationale-fete-ses-100-ans\/\" target=\"_blank\" rel=\"noopener\">UAI<\/a> en 2015.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/16\/conseils-realisez-votre-premiere-photo-de-la-nebuleuse-dorion\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9aliser votre premi\u00e8re photo de la n\u00e9buleuse d&#8217;Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/10\/a-pompei-une-mosaique-illustre-le-mythe-dorion-et-du-scorpion\/\" target=\"_blank\" rel=\"noopener\">Pomp\u00e9i : une mosa\u00efque illustre le mythe d&#8217;Orion et du Scorpion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/20\/le-ciel-aux-jumelles-decouvrez-les-beautes-de-la-ceinture-dorion\/\" target=\"_blank\" rel=\"noopener\">Le ciel aux jumelles : d\u00e9couvrez la belle Ceinture d&#8217;Orion<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Actuellement post\u00e9es au z\u00e9nith en d\u00e9but de nuit, les fausses jumelles Castor et Pollux sont\u00a0 deux brillantes \u00e9toiles \u00e0 d\u00e9couvrir.\u00a0\u00a0 Dans le prolongement d&#8217;Orion : Pour localiser les \u00e9toiles Castor et Pollux (fils jumeaux de Zeus et de L\u00e9da dans la mythologie grecque), vous devez d\u00e9j\u00e0 rep\u00e9rer Orion. La plus belle constellation hivernale est visible &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/25\/castor-et-pollux-deux-fausses-jumelles-dans-le-ciel-dhiver\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Castor et Pollux, deux fausses jumelles dans le ciel d&#8217;hiver<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":15584,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[156,354,91,157],"class_list":["post-15581","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-castor","tag-constellation-dorion","tag-constellation-des-gemeaux","tag-pollux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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