{"id":16301,"date":"2022-08-16T09:41:14","date_gmt":"2022-08-16T09:41:14","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16301"},"modified":"2025-08-03T09:21:47","modified_gmt":"2025-08-03T09:21:47","slug":"zoom-sur-vega-la-plus-belle-etoile-du-ciel-dete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/16\/zoom-sur-vega-la-plus-belle-etoile-du-ciel-dete\/","title":{"rendered":"Zoom sur V\u00e9ga, la plus belle \u00e9toile du ciel d&#8217;\u00e9t\u00e9"},"content":{"rendered":"<p><strong>Plus brillante \u00e9toile du ciel estival, V\u00e9ga est l&#8217;une des pointes du Triangle d&#8217;\u00e9t\u00e9. C&#8217;est le moment de lever les yeux pour l&#8217;admirer.<\/strong><\/p>\n<h5>Carte d&#8217;identit\u00e9 :<\/h5>\n<p>V\u00e9ga (<em>Alpha Lyrae<\/em>) est la cinqui\u00e8me \u00e9toile la plus brillante (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> z\u00e9ro). Depuis nos latitudes, on peut m\u00eame dire qu&#8217;elle est la troisi\u00e8me apr\u00e8s <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/11\/sirius-brille-au-dessus-du-monastere-grec-de-giromeri\/\" target=\"_blank\" rel=\"noopener\">Sirius<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/04\/la-comete-c2013-us-10-catalina-frole-arcturus\/\" target=\"_blank\" rel=\"noopener\">Arcturus<\/a>. Elle est situ\u00e9e \u00e0 environ 25 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>, ce qui en fait la sixi\u00e8me plus proche de toutes les \u00e9toiles brillantes. Un observateur remarque tout de suite sa couleur bleue. Elle correspond \u00e0 une temp\u00e9rature de surface d&#8217;environ 9.400\u00b0 C, soit 4.000\u00b0 de plus que notre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/astronomie-soleil-notre-etoile-va-t-elle-mourir-9545\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>. Bien que V\u00e9ga ne soit \u00e2g\u00e9e que d&#8217;environ 500 millions d&#8217;ann\u00e9es, elle est d\u00e9j\u00e0 \u00e0 la moiti\u00e9 de sa vie :<\/p>\n<figure id=\"attachment_16302\" aria-describedby=\"caption-attachment-16302\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega.jpg\" rel=\"lightbox[16301]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16302\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16302\" class=\"wp-caption-text\">V\u00e9ga est la cinqui\u00e8me \u00e9toile la plus brillante du ciel nocturne. \u00a9 <a href=\"https:\/\/www.astrobin.com\/users\/jmtanous\/\" target=\"_blank\" rel=\"noopener\">Jose Mtanous<\/a><\/figcaption><\/figure>\n<p>Selon une l\u00e9gende japonaise, V\u00e9ga, la plus jeune fille de l\u2019empereur c\u00e9leste, est tisserande. Elle est amoureuse d\u2019Alta\u00efr (il est bouvier, c\u2019est-\u00e0-dire conducteur de b\u0153ufs). Mais le p\u00e8re de la jeune fille ne veut pas et place entre eux une rivi\u00e8re d\u2019\u00e9toiles, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/16\/le-rubin-observatory-en-majeste-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a>. Voyant sa fille inconsolable, l\u2019empereur finit par accepter qu\u2019ils se retrouvent une fois par an. C\u2019est le 7 juillet, septi\u00e8me jour du septi\u00e8me mois de l\u2019ann\u00e9e. Au Japon, cette f\u00eate est l\u2019occasion de nombreux festivals.<!--more--><\/p>\n<h5>Rep\u00e9rage par une nuit d&#8217;\u00e9t\u00e9 :<\/h5>\n<p>Avec Deneb et Alta\u00efr, V\u00e9ga repr\u00e9sente le troisi\u00e8me sommet du Triangle d&#8217;\u00e9t\u00e9. Il suffit de lever la t\u00eate vers 23 heures au mois d&#8217;ao\u00fbt pour remarquer ce brillant ast\u00e9risme en pleine Voie lact\u00e9e :<\/p>\n<figure id=\"attachment_14057\" aria-describedby=\"caption-attachment-14057\" style=\"width: 327px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche.jpg\" rel=\"lightbox[16301]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14057\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-327x450.jpg\" alt=\"\" width=\"327\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-327x450.jpg 327w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-743x1024.jpg 743w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche.jpg 768w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption id=\"caption-attachment-14057\" class=\"wp-caption-text\">Le Triangle d&#8217;\u00e9t\u00e9 apparait en reliant trois \u00e9toiles brillantes : V\u00e9ga, Deneb et Alta\u00efr. \u00a9 Stelvision<\/figcaption><\/figure>\n<p>Deneb est la plus brillante \u00e9toile de la constellation du Cygne (magnitude\u00a01,25). C\u2019est une superg\u00e9ante blanche de 110 rayons solaires, l\u2019une des plus grosses \u00e9toiles connues. On estime sa distance \u00e0 1500 ann\u00e9es-lumi\u00e8re.<\/p>\n<p><iframe loading=\"lazy\" title=\"VN 19 le triangle de l&#039;\u00e9t\u00e9\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/lloGYyKnCyk?start=105&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Quant \u00e0 Alta\u00efr (magnitude 0,77) qui \u00e9tincelle dans la constellation de l\u2019Aigle, c\u2019est l\u2019une des \u00e9toiles les plus proches visibles \u00e0 l\u2019\u0153il nu puisqu\u2019elle n\u2019est qu\u2019\u00e0 17 ann\u00e9es-lumi\u00e8re de la Terre. Alta\u00efr pr\u00e9sente la particularit\u00e9 de tourner tr\u00e8s rapidement sur elle-m\u00eame : entre 6 et 10 heures, alors qu\u2019il faut 25 jours au\u00a0<a title=\"Coucher de Soleil tach\u00e9\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/04\/coucher-soleil-tache\/\" target=\"_blank\" rel=\"noopener noreferrer\">Soleil<\/a>.<br \/>\n<span id=\"more-740\"><\/span><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/12\/voyage-au-coeur-de-letoile-supergeante-ag-carinae\/\" target=\"_blank\" rel=\"noopener\">Voyage au c\u0153ur de l&#8217;\u00e9toile superg\u00e9ante AG Carinae<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/06\/vision-inedite-de-letoile-polaire-entouree-de-gaz-et-de-poussieres\/\" target=\"_blank\" rel=\"noopener\">Vision in\u00e9dite de l&#8217;\u00e9toile Polaire entour\u00e9e de gaz et de poussi\u00e8re<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/07\/26\/hubble-capture-la-lente-agonie-dune-etoile-geante-rouge\/\" target=\"_blank\" rel=\"noopener\">Hubble capture la lente agonie d&#8217;une \u00e9toile g\u00e9ante rouge<\/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> et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>Plus brillante \u00e9toile du ciel estival, V\u00e9ga est l&#8217;une des pointes du Triangle d&#8217;\u00e9t\u00e9. C&#8217;est le moment de lever les yeux pour l&#8217;admirer. Carte d&#8217;identit\u00e9 : V\u00e9ga (Alpha Lyrae) est la cinqui\u00e8me \u00e9toile la plus brillante (magnitude z\u00e9ro). Depuis nos latitudes, on peut m\u00eame dire qu&#8217;elle est la troisi\u00e8me apr\u00e8s Sirius et Arcturus. Elle est &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/16\/zoom-sur-vega-la-plus-belle-etoile-du-ciel-dete\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Zoom sur V\u00e9ga, la plus belle \u00e9toile du ciel d&#8217;\u00e9t\u00e9<\/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":16302,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1384,101,935,100],"class_list":["post-16301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-arcturus","tag-deneb","tag-triangle-dete","tag-vega"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Zoom sur V\u00e9ga, la plus belle \u00e9toile du ciel d&#039;\u00e9t\u00e9<\/title>\n<meta name=\"description\" content=\"Plus brillante \u00e9toile du ciel estival, V\u00e9ga est l&#039;une des pointes du Triangle d&#039;\u00e9t\u00e9. 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