{"id":7180,"date":"2017-01-22T15:10:17","date_gmt":"2017-01-22T15:10:17","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7180"},"modified":"2017-01-30T12:59:19","modified_gmt":"2017-01-30T12:59:19","slug":"planete-venus-son-reflet-etang-gele","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/22\/planete-venus-son-reflet-etang-gele\/","title":{"rendered":"La plan\u00e8te V\u00e9nus et son reflet sur un \u00e9tang gel\u00e9"},"content":{"rendered":"

En ce mois de janvier l’\u00e9clat de V\u00e9nus en d\u00e9but de soir\u00e9e est suffisant pour pouvoir admirer le reflet de la plan\u00e8te de l’amour sur un plan d’eau.<\/strong><\/p>\n

Vous avez tous remarqu\u00e9 qu\u2019un astre tr\u00e8s brillant \u00e9tincelle au-dessus de l\u2019horizon OUEST bien avant la nuit noire depuis quelques semaines. Ce n\u2019est pas un OVNI mais V\u00e9nus, la seconde plan\u00e8te du Syst\u00e8me solaire (seconde en partant du Soleil<\/a>, Mercure<\/a>\u00a0\u00e9tant la premi\u00e8re et la Terre la troisi\u00e8me), l\u2019astre nocturne le plus brillant apr\u00e8s la Lune <\/a>en raison de sa relative proximit\u00e9 et surtout de la couche nuageuse qui l\u2019entoure en permanence et qui renvoie la lumi\u00e8re solaire.<\/p>\n

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

Sa magnitude est actuellement de -4,5 et elle culminera \u00e0 -4,7 entre le 15 et le 20 f\u00e9vrier puis redescendra lentement : m\u00eame si la plan\u00e8te continue de se rapprocher de nous, cela ne suffira plus pour compenser la diminution de sa fraction \u00e9clair\u00e9e (V\u00e9nus, qui \u00e9tait \u00e0 son Dernier Quartier le 14 janvier, ne pr\u00e9sentera plus qu’un croissant<\/a> de 6% le 14 mars).<\/p>\n

L’image ci-dessus, r\u00e9alis\u00e9e dans la soir\u00e9e du 20 janvier, est un assemblage de plusieurs clich\u00e9s (\u00e0 l’aide du logiciel StarMax<\/a>) pris avec un objectif de 8 mm de focale (ouvert \u00e0 5,6), des poses de 30 sec et une sensibilit\u00e9 de 800 iso : j’ai r\u00e9alis\u00e9 une premi\u00e8re pose (astres ponctuels), j’ai attendu quelques minutes puis j’ai encha\u00een\u00e9 50 poses (traits lumineux continus). Le point le plus brillant est V\u00e9nus, la plan\u00e8te Mars<\/a> est juste au-dessus et les autres traces sont faites par des \u00e9toiles.<\/p>\n

Le plan d’eau en grande partie gel\u00e9 (il fait actuellement -10\u00b0 la nuit et -2\u00b0 la journ\u00e9e en Bourgogne) est le T\u00e9l\u00e9ski nautique de C\u00f4te-d’Or (TNCO<\/a>) dont on d\u00e9couvre les pyl\u00f4nes qui supportent les c\u00e2bles destin\u00e9s \u00e0 tracter les skieurs \u00e0 la belle saison.<\/p>\n","protected":false},"excerpt":{"rendered":"

En ce mois de janvier l’\u00e9clat de V\u00e9nus en d\u00e9but de soir\u00e9e est suffisant pour pouvoir admirer le reflet de la plan\u00e8te de l’amour sur un plan d’eau. Vous avez tous remarqu\u00e9 qu\u2019un astre tr\u00e8s brillant \u00e9tincelle au-dessus de l\u2019horizon OUEST bien avant la nuit noire depuis quelques semaines. Ce n\u2019est pas un OVNI mais … Continuer la lecture de La plan\u00e8te V\u00e9nus et son reflet sur un \u00e9tang gel\u00e9<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[207,178,116,963,2034,159],"class_list":["post-7180","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-bourgogne","tag-cote-dor","tag-mars","tag-starmax","tag-tnco","tag-venus"],"yoast_head":"\nLa plan\u00e8te V\u00e9nus et son reflet sur un \u00e9tang gel\u00e9<\/title>\n<meta name=\"description\" content=\"En ce mois de janvier l'\u00e9clat de V\u00e9nus en d\u00e9but de soir\u00e9e est suffisant pour pouvoir admirer le reflet de la plan\u00e8te de l'amour sur un plan d'eau.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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