{"id":10036,"date":"2018-12-12T08:29:15","date_gmt":"2018-12-12T08:29:15","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10036"},"modified":"2018-12-24T15:12:14","modified_gmt":"2018-12-24T15:12:14","slug":"venus-mercure-et-le-massif-du-mont-blanc","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/12\/venus-mercure-et-le-massif-du-mont-blanc\/","title":{"rendered":"V\u00e9nus, Mercure et le massif du Mont-Blanc"},"content":{"rendered":"

Alors que le froid s’est install\u00e9 en Bourgogne, je suis parti \u00e0 l’aube en qu\u00eate de deux plan\u00e8tes. Elles se sont d\u00e9voil\u00e9es au-dessus du massif du Mont-Blanc.<\/strong><\/p>\n

6 heures : le thermom\u00e8tre affiche -4\u00b0 et la voiture est couverte de givre. Hier soir le ciel s’est enfin d\u00e9gag\u00e9, laissant le chasseur Orion<\/a> prendre peu \u00e0 peu possession du ciel d’hiver, non loin des Pl\u00e9iades<\/a> et de la com\u00e8te 46P\/Wirtanen<\/a> qui passera \u00e0 proximit\u00e9 de cet amas d’\u00e9toiles le weekend prochain. Mais ce matin j’ai rendez-vous avec V\u00e9nus et je l’esp\u00e8re Mercure. Apr\u00e8s avoir gratt\u00e9 mon pare-brise, je m’\u00e9loigne de la pollution lumineuse et je gagne les hauteurs entre Dijon<\/a> et Beaune<\/a>.<\/p>\n

\"\"<\/a>
Le 12 d\u00e9cembre V\u00e9nus brille \u00e0 la verticale du Mont-Blanc. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Plein EST, je sais que je vais pouvoir admirer les deux premi\u00e8res plan\u00e8tes du Syst\u00e8me solaire et peut-\u00eatre m\u00eame la silhouette du massif du Mont-Blanc \u00e0 l’horizon (240 kilom\u00e8tres m’en s\u00e9parent \u00e0 vol d’oiseau).<\/p>\n

Si V\u00e9nus<\/a> est immanquable (on peut m\u00eame deviner les ombres que projette ce phare c\u00e9leste dont la magnitude<\/a> est de -4,7), Mercure<\/a>, beaucoup plus pr\u00e8s de l’horizon et moins brillante (magnitude 0,5) demande un peu d’attention pour \u00eatre rep\u00e9r\u00e9e \u00e0 l’\u0153il nu. Cette image permet de voir la diff\u00e9rence d’\u00e9clat entre ces deux astres :<\/p>\n

\"\"<\/a>
V\u00e9nus et la discr\u00e8te Mercure \u00e0 l’aube du 12 d\u00e9cembre. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Comme ce fut le cas lorsque j’ai photographi\u00e9 la vieille Lune du 13 f\u00e9vrier<\/a>, la silhouette du massif du Mont-Blanc se d\u00e9coupe sur l’horizon.\u00a0Le 22 d\u00e9cembre prochain Jupiter<\/a> (qui revient lentement \u00e0 l’aube apr\u00e8s sa conjonction avec le Soleil<\/a> le 26 novembre) se trouvera juste \u00e0 c\u00f4t\u00e9 de Mercure.<\/p>\n

Ces images ont \u00e9t\u00e9 r\u00e9alis\u00e9es avec un bo\u00eetier Nikon D7100, un zoom 18-105 mm ouvert \u00e0 5,6 et une sensibilit\u00e9 de 1600 iso (temps de pose variables).<\/p>\n","protected":false},"excerpt":{"rendered":"

Alors que le froid s’est install\u00e9 en Bourgogne, je suis parti \u00e0 l’aube en qu\u00eate de deux plan\u00e8tes. Elles se sont d\u00e9voil\u00e9es au-dessus du massif du Mont-Blanc. 6 heures : le thermom\u00e8tre affiche -4\u00b0 et la voiture est couverte de givre. Hier soir le ciel s’est enfin d\u00e9gag\u00e9, laissant le chasseur Orion prendre peu \u00e0 … Continuer la lecture de V\u00e9nus, Mercure et le massif du Mont-Blanc<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10037,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[207,140,2450,159],"class_list":["post-10036","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-bourgogne","tag-mercure","tag-mont-blanc","tag-venus"],"yoast_head":"\nV\u00e9nus, Mercure et le massif du Mont-Blanc<\/title>\n<meta name=\"description\" content=\"Alors que le froid s'est install\u00e9 en Bourgogne, je suis parti \u00e0 l'aube en qu\u00eate de deux plan\u00e8tes. 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