{"id":4810,"date":"2016-01-24T07:25:50","date_gmt":"2016-01-24T07:25:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4810"},"modified":"2016-01-27T05:37:10","modified_gmt":"2016-01-27T05:37:10","slug":"liss-et-saturne-le-transit-etait-trop-beau-pour-etre-vrai","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/24\/liss-et-saturne-le-transit-etait-trop-beau-pour-etre-vrai\/","title":{"rendered":"L&#8217;ISS et Saturne : le transit \u00e9tait trop beau pour \u00eatre vrai"},"content":{"rendered":"<p><strong>Le 18 janvier dernier les images d&#8217;un transit de l&#8217;ISS devant Saturne faisaient la une des m\u00e9dias. Une vid\u00e9o qui n&#8217;a pas r\u00e9sist\u00e9 \u00e0 l&#8217;analyse.<\/strong><\/p>\n<p>Le 18 janvier je vous pr\u00e9sentais l&#8217;incroyable transit de l&#8217;ISS devant Saturne, une vid\u00e9o r\u00e9alis\u00e9e par le jeune astronome amateur Julian We\u00dfel dans laquelle on voyait passer rapidement la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/09\/station-spatiale-internationale\/\" target=\"_blank\">Station spatiale internationale<\/a> devant la c\u00e9l\u00e8bre plan\u00e8te aux anneaux le 15 janvier. Ce sujet allait ensuite \u00eatre repris par plusieurs m\u00e9dias et obtenait le 22 janvier la cons\u00e9cration supr\u00eame : une pr\u00e9sentation sur l&#8217;<a href=\"http:\/\/apod.nasa.gov\/apod\/ap160122.html\" target=\"_blank\">APOD<\/a>, le site am\u00e9ricain qui nous offre quotidiennement une image du ciel exceptionnelle.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4811\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/fake-450x253.jpg\" alt=\"fake\" width=\"450\" height=\"253\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/fake-450x253.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/fake-768x432.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/fake.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/p>\n<p>Pourtant plusieurs sp\u00e9cialistes sont venus mettre en doute cette vid\u00e9o. C&#8217;est le cas par exemple de l&#8217;astronome amateur\u00a0<a href=\"http:\/\/www.stephenramsden.com\/\" target=\"_blank\">Stephen W. Ramsden.<\/a><\/p>\n<p><!--more-->Dans un long <a href=\"https:\/\/www.facebook.com\/stephenramsden\/posts\/10156494655195088\" target=\"_blank\">texte<\/a>\u00a0bien argument\u00e9,\u00a0Stephen W. Ramsden \u00a0pr\u00e9sente quelques \u00e9vidences qui prouvent que cette vid\u00e9o est un montage. Tout d&#8217;abord le transit s&#8217;est produit le 15 janvier \u00e0 l&#8217;aube, 2 minutes apr\u00e8s le lever du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/14\/15-images-pour-detailler-un-lever-de-soleil\/\" target=\"_blank\">Soleil<\/a>, rendant impossible le contraste et la qualit\u00e9 de la vid\u00e9o sur laquelle le fond du ciel est parfaitement noir.<\/p>\n<p>D&#8217;autre part Stephen W. Ramsden rapporte des calculs troublants : au moment du transit la taille apparente de l&#8217;ISS (24,1 sec d&#8217;arc) \u00e9tait presque deux fois plus grande que celle de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/\" target=\"_blank\">Saturne<\/a> (15,6 sec d&#8217;arc). Sur les images de Julian We\u00dfel ce n&#8217;est pas du tout le cas !<\/p>\n<p>Enfin, dernier argument pr\u00e9sent\u00e9 par Ramsden, la cam\u00e9ra utilis\u00e9e pour saisir un transit aussi rapide (0,2 seconde) ne peut pas d\u00e9livrer des images aussi nettes, d\u00e9taill\u00e9es et color\u00e9es que celles visibles sur la vid\u00e9o incrimin\u00e9e.<\/p>\n<p>Il faut donc se rendre \u00e0 l&#8217;\u00e9vidence : cette vid\u00e9o est tr\u00e8s certainement un montage et\u00a0Julian We\u00dfel n&#8217;a jamais film\u00e9 de transit de l&#8217;ISS devant Saturne \u00e0 l&#8217;aube du 15 janvier (ou s&#8217;il y est parvenu sa vid\u00e9o ne ressemble pas du tout \u00e0 celle qui a fait le tour des m\u00e9dias). Cet astronome amateur, qui par ailleurs fait de tr\u00e8s belles images du ciel, a sans doute voulu attirer l&#8217;attention sur lui et au passage monnayer son talent (un certain nombre de ses images sont propos\u00e9es \u00e0 la vente sur son site internet)&#8230;<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Le 18 janvier dernier les images d&#8217;un transit de l&#8217;ISS devant Saturne faisaient la une des m\u00e9dias. Une vid\u00e9o qui n&#8217;a pas r\u00e9sist\u00e9 \u00e0 l&#8217;analyse. Le 18 janvier je vous pr\u00e9sentais l&#8217;incroyable transit de l&#8217;ISS devant Saturne, une vid\u00e9o r\u00e9alis\u00e9e par le jeune astronome amateur Julian We\u00dfel dans laquelle on voyait passer rapidement la Station &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/24\/liss-et-saturne-le-transit-etait-trop-beau-pour-etre-vrai\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">L&#8217;ISS et Saturne : le transit \u00e9tait trop beau pour \u00eatre vrai<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":4811,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[196,1458,136,1464,828],"class_list":["post-4810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-iss","tag-julian-wesel","tag-saturne","tag-stephen-w-ramsden","tag-transit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L&#039;ISS et Saturne : le transit \u00e9tait trop beau pour \u00eatre vrai<\/title>\n<meta name=\"description\" content=\"Le 18 janvier dernier les images d&#039;un transit de l&#039;ISS devant Saturne faisaient la une des m\u00e9dias. 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