{"id":7058,"date":"2017-01-05T15:43:09","date_gmt":"2017-01-05T15:43:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7058"},"modified":"2017-01-12T13:50:30","modified_gmt":"2017-01-12T13:50:30","slug":"mars-neptune-se-rencontrent-verseau","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/05\/mars-neptune-se-rencontrent-verseau\/","title":{"rendered":"Mars et Neptune se rencontrent dans le Verseau"},"content":{"rendered":"

Les astronomes \u00e9taient mobilis\u00e9s le Jour de l’An \u00e0 l’occasion du rapprochement apparent entre les plan\u00e8tes Mars et Neptune dans la constellation du Verseau.<\/strong><\/p>\n

L’ann\u00e9e 2017 a d\u00e9marr\u00e9 rapidement pour les amoureux des spectacles c\u00e9lestes. La premi\u00e8re soir\u00e9e du mois de janvier \u00e9tait en effet l’occasion de rep\u00e9rer la tr\u00e8s discr\u00e8te Neptune (la derni\u00e8re plan\u00e8te du Syst\u00e8me solaire<\/a> est de magnitude 8, donc invisible \u00e0 l’\u0153il nu) \u00e0 seulement quelques minutes d’arc de la Plan\u00e8te rouge<\/a>. Le rendez-vous avait lieu dans le Verseau, une constellation dans laquelle Neptune est install\u00e9e depuis janvier 2011 et qu’elle quittera en mai 2022.<\/p>\n

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

C’est l’astrophotographe Kevin R. Witman<\/a> qui a photographi\u00e9 cette \u00e9tonnante conjonction depuis Cochranville (une localit\u00e9 am\u00e9ricaine situ\u00e9e dans le comt\u00e9 de Chester, en Pennsylvanie) \u00e0 l’aide d’une lunette astronomique<\/a> de 80 mm de diam\u00e8tre.<\/p>\n

Outre son aspect esth\u00e9tique, cette image est riche en informations. On y remarque d’abord la couleur des plan\u00e8tes : Neptune est un petit disque vert-bleu produit par la pr\u00e9sence de m\u00e9thane dans l’atmosph\u00e8re de cette g\u00e9ante gazeuse (un peu moins de 50.000 km de diam\u00e8tre \u00e9quatorial) qui fut d\u00e9couverte le 23 septembre 1846 par l’astronome allemand Johann Gottfried Galle (ce dernier s’appuyant sur les calculs r\u00e9alis\u00e9s par Urbain Le Verrier qui deviendra quelques ann\u00e9es plus tard directeur de l’Observatoire de Paris<\/a>). Quant \u00e0 Mars elle doit sa couleur orange \u00e0 l’abondance d’oxyde de fer \u00e0 sa surface, une teinte qui lui vaut le surnom de Plan\u00e8te rouge<\/a> et qui en a fait le dieu de la guerre dans la mythologie romaine (allusion lointaine \u00e0 la couleur du sang).<\/p>\n

Autre information r\u00e9v\u00e9l\u00e9e par cette image : la diff\u00e9rence d’\u00e9clat entre les deux plan\u00e8tes. Mars (distante de 1,67 Unit\u00e9 Astronomique) est de magnitude 1 alors que Neptune (qui vogue \u00e0 plus de 30,51 UA) est de magnitude 8, soit 610 fois moins lumineuse environ.<\/p>\n

Si vous avez rat\u00e9 ce rendez-vous plan\u00e9taire, sachez que le 12 janvier en soir\u00e9e ce sera au tour de V\u00e9nus<\/a> de s’approcher \u00e0 seulement 0,4\u00b0 apparent de Neptune.<\/p>\n","protected":false},"excerpt":{"rendered":"

Les astronomes \u00e9taient mobilis\u00e9s le Jour de l’An \u00e0 l’occasion du rapprochement apparent entre les plan\u00e8tes Mars et Neptune dans la constellation du Verseau. L’ann\u00e9e 2017 a d\u00e9marr\u00e9 rapidement pour les amoureux des spectacles c\u00e9lestes. La premi\u00e8re soir\u00e9e du mois de janvier \u00e9tait en effet l’occasion de rep\u00e9rer la tr\u00e8s discr\u00e8te Neptune (la derni\u00e8re plan\u00e8te … Continuer la lecture de Mars et Neptune se rencontrent dans le Verseau<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7059,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[2001,1702,2002,116,642,1324,115,672,1703],"class_list":["post-7058","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-constellation-du-verseau","tag-johann-gottfried-galle","tag-kevin-r-witman","tag-mars","tag-neptune","tag-observatoire-de-paris","tag-planete-rouge","tag-unite-astronomique","tag-urbain-le-verrier"],"yoast_head":"\nMars et Neptune se rencontrent dans le Verseau<\/title>\n<meta name=\"description\" content=\"Les 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