{"id":5409,"date":"2016-04-07T16:19:46","date_gmt":"2016-04-07T16:19:46","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5409"},"modified":"2016-04-18T14:22:31","modified_gmt":"2016-04-18T14:22:31","slug":"un-flash-iridium-depuis-le-chateau-de-la-tour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/04\/07\/un-flash-iridium-depuis-le-chateau-de-la-tour\/","title":{"rendered":"Un flash Iridium depuis le ch\u00e2teau de la Tour"},"content":{"rendered":"

Lundi 28 mars en d\u00e9but de soir\u00e9e j’avais rendez-vous au pied du ch\u00e2teau de la Tour pour admirer un flash Iridium de magnitude -6.<\/strong><\/p>\n

Si vous observez r\u00e9guli\u00e8rement le ciel \u00e0 l’aube ou au cr\u00e9puscule, peut-\u00eatre vous est-il arriv\u00e9 d’\u00eatre surpris par un point se d\u00e9pla\u00e7ant dans le ciel et dont l’intensit\u00e9 lumineuse cro\u00eet rapidement avant de diminuer.<\/p>\n

Vous avez sans doute assist\u00e9 \u00e0 un flash Iridium, du nom de cette armada de satellites de communications dont la mise en service a d\u00e9but\u00e9 fin 1998 et qui poss\u00e8dent trois antennes rectangulaires r\u00e9fl\u00e9chissantes. Il arrive que la lumi\u00e8re solaire qui frappe ces panneaux soit renvoy\u00e9e vers la Terre, produisant un faisceau lumineux d\u2019environ 10 km de diam\u00e8tre sur le sol. Il suffit de vous trouver dans cette zone pour observer le flash.<\/p>\n

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

L’image ci-dessus montre un flash Iridium de magnitude -6 photographi\u00e9 dans la soir\u00e9e du 28 mars depuis le ch\u00e2teau de la Tour<\/a>, non loin du ch\u00e2teau du Clos de Vougeot<\/a> en Bourgogne.<\/p>\n

\"iridium1\"<\/a><\/p>\n

Comme les param\u00e8tres orbitaux de ces satellites sont parfaitement connus, il est possible de pr\u00e9dire avec pr\u00e9cision \u00e0 la fois l\u2019heure et la luminosit\u00e9 d\u2019un tel \u00e9v\u00e9nement pour un point quelconque \u00e0 la surface de la Terre.<\/p>\n

Le site Heavens-Above <\/a>vous propose la liste des flash Iridium que vous allez pouvoir observer (apr\u00e8s avoir rentr\u00e9 vos coordonn\u00e9es g\u00e9ographiques) ainsi que la trajectoire des satellites devant les constellations.<\/p>\n

\"iridium2\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Lundi 28 mars en d\u00e9but de soir\u00e9e j’avais rendez-vous au pied du ch\u00e2teau de la Tour pour admirer un flash Iridium de magnitude -6. Si vous observez r\u00e9guli\u00e8rement le ciel \u00e0 l’aube ou au cr\u00e9puscule, peut-\u00eatre vous est-il arriv\u00e9 d’\u00eatre surpris par un point se d\u00e9pla\u00e7ant dans le ciel et dont l’intensit\u00e9 lumineuse cro\u00eet rapidement … Continuer la lecture de Un flash Iridium depuis le ch\u00e2teau de la Tour<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5413,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[207,762,1207,1465,308],"class_list":["post-5409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-bourgogne","tag-chateau-de-la-tour","tag-chateau-du-clos-de-vougeot","tag-flash-iridium","tag-heavens-above"],"yoast_head":"\nUn flash Iridium depuis le ch\u00e2teau de la Tour<\/title>\n<meta name=\"description\" content=\"Lundi 28 mars en 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