{"id":8972,"date":"2018-03-07T14:10:30","date_gmt":"2018-03-07T14:10:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8972"},"modified":"2018-03-15T06:22:11","modified_gmt":"2018-03-15T06:22:11","slug":"7-mars-jupiter-lune-gibbeuse-decroissante","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/03\/07\/7-mars-jupiter-lune-gibbeuse-decroissante\/","title":{"rendered":"7 mars : Jupiter et la Lune gibbeuse d\u00e9croissante"},"content":{"rendered":"

La plus grosse plan\u00e8te du Syst\u00e8me solaire se trouvait \u00e0 quelques encablures de la Lune gibbeuse d\u00e9croissante \u00e0 l’aube de ce mercredi 7 mars.<\/strong><\/p>\n

Qu’appelle-t-on Lune gibbeuse ? Il s’agit du moment o\u00f9 notre satellite naturel pr\u00e9sente un certain embonpoint du c\u00f4t\u00e9 du terminateur, entre le Premier Quartier<\/a> et la Pleine Lune<\/a> (c’est la Lune gibbeuse croissante) et entre la Pleine Lune et le Dernier Quartier<\/a> : dans ce cas on parle de Lune gibbeuse d\u00e9croissante comme \u00e0 l’aube de ce 7 mars, 2 jours avant le Dernier Quartier.<\/p>\n

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

La Lune est un excellent moyen pour rep\u00e9rer les plan\u00e8tes et nous la voyons sur ce clich\u00e9 non loin de Jupiter<\/a>, alors que le ciel commence \u00e0 s’\u00e9claircir et \u00e0 effacer les \u00e9toiles (il a \u00e9t\u00e9 n\u00e9cessaire de surexposer la Lune pour bien voir Jupiter).<\/p>\n

Jupiter, la g\u00e9ante gazeuse qui est aussi la plus grosse plan\u00e8te du Syst\u00e8me solaire, se trouve actuellement dans la constellation de la Balance. Elle pr\u00e9sente un diam\u00e8tre apparent de 40 secondes d\u2019arc et une\u00a0magnitude<\/a>\u00a0de -2,2. Ces valeurs ne cessent d’augmenter puisque la plan\u00e8te se rapproche de nous : le 9 mai Jupiter sera \u00e0 658 millions de km (ce sera l’opposition) et pr\u00e9sentera un diam\u00e8tre apparent de 44,8 secondes d\u2019arc et une magnitude de -2,5.<\/p>\n

\"\"<\/a>
Superbe dessin de Jupiter r\u00e9alis\u00e9 le 28 ao\u00fbt 2011 \u00e0 l\u2019aide d\u2019un t\u00e9lescope de 406 mm de diam\u00e8tre (les satellites sont Ganym\u00e8de en haut et Europe). \u00a9 Fr\u00e9d\u00e9ric Burgeot<\/figcaption><\/figure>\n

Elle est donc d\u00e9j\u00e0 bien observable dans une\u00a0longue-vue<\/a>\u00a0ou un t\u00e9lescope : on peut suivre le ballet des 4 principaux satellites (Io,\u00a0Europe<\/a>,\u00a0Ganym\u00e8de<\/a>\u00a0et\u00a0Callisto<\/a>) et rep\u00e9rer quelques bandes gazeuses sur la plan\u00e8te ainsi que la c\u00e9l\u00e8bre Grande Tache rouge<\/a>.<\/p>\n

Les 9 et 10 mars \u00e0 l’aube la Lune s’approchera de la plan\u00e8te Mars<\/a> et le 11 elle sera aux c\u00f4t\u00e9s de Saturne<\/a>, des rapprochements qui ne sont bien entendu qu’apparents : alors que notre satellite naturel navigue \u00e0 400.000 km de nous, Jupiter est \u00e0 744 millions de km, Mars \u00e0 203 millions de km et Saturne \u00e0 1,56 milliard de km !<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

La plus grosse plan\u00e8te du Syst\u00e8me solaire se trouvait \u00e0 quelques encablures de la Lune gibbeuse d\u00e9croissante \u00e0 l’aube de ce mercredi 7 mars. Qu’appelle-t-on Lune gibbeuse ? Il s’agit du moment o\u00f9 notre satellite naturel pr\u00e9sente un certain embonpoint du c\u00f4t\u00e9 du terminateur, entre le Premier Quartier et la Pleine Lune (c’est la Lune … Continuer la lecture de 7 mars : Jupiter et la Lune gibbeuse d\u00e9croissante<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":8973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[135,90,165],"class_list":["post-8972","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-constellation-de-la-balance","tag-jupiter","tag-lune-gibbeuse"],"yoast_head":"\n7 mars : Jupiter et la Lune gibbeuse d\u00e9croissante<\/title>\n<meta name=\"description\" content=\"La plus grosse plan\u00e8te du Syst\u00e8me solaire se trouvait \u00e0 quelques encablures de la Lune gibbeuse d\u00e9croissante \u00e0 l'aube 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