{"id":12092,"date":"2020-05-30T09:04:19","date_gmt":"2020-05-30T09:04:19","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12092"},"modified":"2020-06-24T10:23:24","modified_gmt":"2020-06-24T10:23:24","slug":"venus-sapproche-sous-la-forme-dun-tres-fin-croissant","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/30\/venus-sapproche-sous-la-forme-dun-tres-fin-croissant\/","title":{"rendered":"V\u00e9nus s&#8217;approche sous la forme d&#8217;un tr\u00e8s fin croissant"},"content":{"rendered":"<p><strong>Dans les semaines qui encadrent sa conjonction avec le Soleil, la plan\u00e8te V\u00e9nus se pr\u00e9sente en croissant, un ph\u00e9nom\u00e8ne comparable aux phases de la Lune.<\/strong><\/p>\n<h5>Des phases pour V\u00e9nus :<\/h5>\n<p>Tout comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/22\/une-danseuse-aux-cotes-des-planetes-venus-et-mercure\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mercure<\/a>, l&#8217;autre plan\u00e8te int\u00e9rieure (leurs orbites sont comprises entre la Terre et le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/15\/se-forme-halo-autour-soleil\/\" target=\"_blank\" rel=\"noopener noreferrer\">Soleil<\/a>), V\u00e9nus pr\u00e9sente des phases tr\u00e8s marqu\u00e9es. Le ph\u00e9nom\u00e8ne est spectaculaire quand on s&#8217;approche de la conjonction. Celle qui se produit le 3 juin est une conjonction inf\u00e9rieure, ce qui signifie que la plan\u00e8te passe entre nous et notre \u00e9toile. L&#8217;alignement entre les trois astres ne sera pas rigoureusement exact et nous n&#8217;assisterons donc pas \u00e0 un <a href=\"http:\/\/www.futura-sciences.com\/videos\/d\/transit-venus-2012-tres-haute-definition-33\/\" target=\"_blank\" rel=\"noopener noreferrer\">transit de V\u00e9nus<\/a> devant notre \u00e9toile comme ce fut le cas le 6 juin 2012.<\/p>\n<figure id=\"attachment_12093\" aria-describedby=\"caption-attachment-12093\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus.jpg\" rel=\"lightbox[12092]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12093\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus-450x301.jpg\" alt=\"\" width=\"450\" height=\"301\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus-450x301.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus-1024x686.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus-768x514.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/05\/Venus.jpg 1201w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12093\" class=\"wp-caption-text\">Le tr\u00e8s fin croissant de V\u00e9nus au cr\u00e9puscule. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>En attendant on assiste \u00e0 la chute de V\u00e9nus sur l&#8217;horizon OUEST apr\u00e8s le coucher du Soleil et il devient difficile de localiser la plan\u00e8te dans un ciel tr\u00e8s lumineux.<!--more--><\/p>\n<h5>Comment rep\u00e9rer le croissant de V\u00e9nus :<\/h5>\n<p>Un balayage attentif avec une paire de jumelles vous permettra cependant de d\u00e9couvrir un tr\u00e8s joli croissant v\u00e9nusien. Hier soir il repr\u00e9sentait environ 1% de la plan\u00e8te, laquelle se situe \u00e0 moins de 45 millions de km de la Terre. Une si courte distance nous permet de discerner le croissant v\u00e9nusien avec un diam\u00e8tre apparent qui fr\u00f4le 1 minute d&#8217;arc, 1\/30\u00e8me du diam\u00e8tre lunaire. Une paire de jumelles permet d\u00e9j\u00e0 d&#8217;appr\u00e9cier cette phase qu&#8217;une longue focale mettra en \u00e9vidence sur une photographie. Ici il s&#8217;agit du bo\u00eetier Panasonic FZ82 dont le zoom se d\u00e9ploie g\u00e9n\u00e9reusement jusqu&#8217;\u00e0 1200 millim\u00e8tres de focale !<\/p>\n<p>Apr\u00e8s sa conjonction inf\u00e9rieure, V\u00e9nus fera son retour dans le ciel du matin qu&#8217;elle va occuper pendant plusieurs mois. Puis elle replongera en direction du Soleil pour sa prochaine conjonction au mois de mars 2021 avant de redevenir plan\u00e8te du soir.<\/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>Dans les semaines qui encadrent sa conjonction avec le Soleil, la plan\u00e8te V\u00e9nus se pr\u00e9sente en croissant, un ph\u00e9nom\u00e8ne comparable aux phases de la Lune. Des phases pour V\u00e9nus : Tout comme Mercure, l&#8217;autre plan\u00e8te int\u00e9rieure (leurs orbites sont comprises entre la Terre et le Soleil), V\u00e9nus pr\u00e9sente des phases tr\u00e8s marqu\u00e9es. Le ph\u00e9nom\u00e8ne est &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/30\/venus-sapproche-sous-la-forme-dun-tres-fin-croissant\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">V\u00e9nus s&#8217;approche sous la forme d&#8217;un tr\u00e8s fin croissant<\/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":12093,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1155,2123],"class_list":["post-12092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-conjonction-inferieure","tag-croissant-de-venus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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