{"id":11481,"date":"2019-12-09T05:19:58","date_gmt":"2019-12-09T05:19:58","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11481"},"modified":"2019-12-30T17:41:08","modified_gmt":"2019-12-30T17:41:08","slug":"portrait-lewis-swift-celebre-chasseur-de-cometes-americain","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/12\/09\/portrait-lewis-swift-celebre-chasseur-de-cometes-americain\/","title":{"rendered":"Portrait : Lewis Swift, c\u00e9l\u00e8bre chasseur de com\u00e8tes am\u00e9ricain"},"content":{"rendered":"<p><strong>Lewis Swift consacra sa vie \u00e0 traquer les astres chevelus, lui qui fut l&#8217;un des rares astronomes \u00e0 conna\u00eetre deux passages de la com\u00e8te de Halley.<\/strong><\/p>\n<h5>Accident de jeunesse :<\/h5>\n<p>Un lourd handicap peut parfois d\u00e9velopper le caract\u00e8re d&#8217;un enfant. On peut se demander si Lewis Swift aurait \u00e9t\u00e9 l\u2019un des astronomes les plus c\u00e9l\u00e8bres du XIXe si\u00e8cle s\u2019il ne s\u2019\u00e9tait pas fractur\u00e9 la hanche lors d\u2019une chute alors qu\u2019il \u00e9tait jeune. Cet accident malheureux survenu en 1833 (il avait 13 ans) l\u2019a handicap\u00e9 \u00e0 vie. Ne pouvant plus travailler sur la ferme familiale, le\u00a0 jeune Lewis a donc \u00e9t\u00e9 autoris\u00e9 \u00e0 aller \u00e0 l&#8217;\u00e9cole, ce qu&#8217;il faisait chaque jour avec des b\u00e9quilles. C&#8217;est l\u00e0 qu&#8217;il a d\u00e9velopp\u00e9 son go\u00fbt pour l&#8217;astronomie.<\/p>\n<figure id=\"attachment_11483\" aria-describedby=\"caption-attachment-11483\" style=\"width: 389px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/leonides.jpg\" rel=\"lightbox[11481]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11483\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/leonides-389x450.jpg\" alt=\"\" width=\"389\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/leonides-389x450.jpg 389w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/leonides.jpg 677w\" sizes=\"auto, (max-width: 389px) 100vw, 389px\" \/><\/a><figcaption id=\"caption-attachment-11483\" class=\"wp-caption-text\">Gravure illustrant la pluie d&#8217;\u00e9toiles filantes des L\u00e9onides en 1833.<\/figcaption><\/figure>\n<p>En 1833 il assiste \u00e0 la grande pluie d&#8217;\u00e9toiles filantes des <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-leonides-4054\/\" target=\"_blank\" rel=\"noopener noreferrer\">L\u00e9onides<\/a>. En 1835 c&#8217;est le passage de la<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/21\/en-video-giotto-survolait-la-comete-de-halley-il-y-a-30-ans\/\" target=\"_blank\" rel=\"noopener noreferrer\"> com\u00e8te de Halley<\/a> suivi quelques ann\u00e9es plus tard de la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/C\/1843_D1\" target=\"_blank\" rel=\"noopener noreferrer\">com\u00e8te de 1843<\/a>, l&#8217;une des plus brillantes du si\u00e8cle.<\/p>\n<h5>Premi\u00e8re d\u00e9couverte :<\/h5>\n<p>Inspir\u00e9 par les livres d&#8217;astronomie de l&#8217;\u00e9poque, il ach\u00e8te un petit t\u00e9lescope vers 1860 et s&#8217;installe dans la ville de Marathon en Floride. En 1862\u00a0 il d\u00e9couvre sa premi\u00e8re com\u00e8te. Observ\u00e9 ind\u00e9pendamment trois jours plus tard par Horace Tuttle \u00e0 l\u2019observatoire de Harvard, l&#8217;astre chevelu prend le nom de com\u00e8te Swift-Tuttle. On d\u00e9couvre alors que cette com\u00e8te est \u00e0 l&#8217;origine de l&#8217;essaim d&#8217;\u00e9toiles filantes des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/08\/18\/perseides-2019-des-etoiles-filantes-sous-la-lune\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pers\u00e9ides<\/a>. Lewis Swift acquiert \u00e0 cette occasion un prestige international et d\u00e9cide de consacrer sa vie \u00e0 la recherche de com\u00e8tes. Ayant d\u00e9m\u00e9nag\u00e9 \u00e0 Rochester, il devient rapidement une c\u00e9l\u00e9brit\u00e9 locale, tant pour son passe-temps inhabituel que pour les conf\u00e9rences d&#8217;astronomie qu&#8217;il donne.<\/p>\n<figure id=\"attachment_11482\" aria-describedby=\"caption-attachment-11482\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift.jpg\" rel=\"lightbox[11481]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11482\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift-450x225.jpg\" alt=\"\" width=\"450\" height=\"225\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift-450x225.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift-768x384.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift-1024x512.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/swift.jpg 1600w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11482\" class=\"wp-caption-text\">Rare photographie de l&#8217;astronome amateur Lewis Swift observant avec un r\u00e9fracteur.<\/figcaption><\/figure>\n<p>Swift a install\u00e9 son t\u00e9lescope sur le toit plat d&#8217;un b\u00e2timent o\u00f9 il se rend chaque nuit claire. Marcher 500 m\u00e8tres et monter des \u00e9chelles n&#8217;est pas \u00e9vident pour l&#8217;homme handicap\u00e9 qu&#8217;il est. Mais la passion l&#8217;emporte et Swift d\u00e9couvre cinq nouvelles com\u00e8tes entre 1877 et 1881.<\/p>\n<h5>Directeur d&#8217;observatoire :<\/h5>\n<p>Les activit\u00e9s de Lewis Swift attirent l&#8217;attention de <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hulbert_Harrington_Warner\" target=\"_blank\" rel=\"noopener noreferrer\">Hulbert Harrington Warner<\/a>, riche homme d&#8217;affaires qui a fait fortune dans les brevets de m\u00e9dicaments. Ce dernier fait construire un observatoire \u00e0 Rochester (inaugur\u00e9 en 1882) o\u00f9 il invite Swift qui en devient le directeur. L&#8217;\u00e9tablissement se voit dot\u00e9 d&#8217;un r\u00e9fracteur de 40 centim\u00e8tres de diam\u00e8tre,\u00a0 la quatri\u00e8me plus grande lunette astronomique en service aux \u00c9tats-Unis \u00e0 l\u2019\u00e9poque.<\/p>\n<figure id=\"attachment_11484\" aria-describedby=\"caption-attachment-11484\" style=\"width: 366px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/warner.jpg\" rel=\"lightbox[11481]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11484\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/warner-366x450.jpg\" alt=\"\" width=\"366\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/warner-366x450.jpg 366w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/11\/warner.jpg 516w\" sizes=\"auto, (max-width: 366px) 100vw, 366px\" \/><\/a><figcaption id=\"caption-attachment-11484\" class=\"wp-caption-text\">Lewis Swift et le r\u00e9fracteur de 40 centim\u00e8tres de l&#8217;observatoire Warner.<\/figcaption><\/figure>\n<p>Pendant les ann\u00e9es qui suivent Swift d\u00e9couvre plus de 900 nouvelles n\u00e9buleuses non catalogu\u00e9es ainsi que 3 autres com\u00e8tes. Son activit\u00e9 d&#8217;observateur ne l&#8217;emp\u00eache pas d&#8217;ouvrir l&#8217;observatoire au public deux soirs par semaine, ce qui est unique \u00e0 l&#8217;\u00e9poque.<\/p>\n<h5><strong>De l&#8217;autre c\u00f4t\u00e9 du pays :\u00a0<\/strong><\/h5>\n<p>En 1893 Hulbert Harrington Warner fait faillite et ne peut plus soutenir financi\u00e8rement l&#8217;observatoire. Heureusement pour Swift, sa r\u00e9putation attire l&#8217;attention de <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thaddeus_S._C._Lowe\" target=\"_blank\" rel=\"noopener noreferrer\">Thaddeus Lowe<\/a>, scientifique et inventeur. Ce dernier lui propose de venir s&#8217;installer en Californie pour diriger le nouvel observatoire Lowe \u00e0 Echo Mountain, pr\u00e8s de Los Angeles. C&#8217;est l\u00e0-bas que Swift continue d&#8217;ajouter de nouvelles com\u00e8tes \u00e0 sa liste. Il y en aura 13 au total, la derni\u00e8re en 1899 alors qu&#8217;il a 79 ans ! Puis sa vue baisse tr\u00e8s rapidement et il n&#8217;est pas certain qu&#8217;il ait pu admirer le passage de la com\u00e8te de Halley en 1910. Il d\u00e9c\u00e8de trois ans plus tard.<\/p>\n<figure id=\"attachment_11055\" aria-describedby=\"caption-attachment-11055\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331.jpg\" rel=\"lightbox[11481]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11055\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/DSC_7331.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11055\" class=\"wp-caption-text\">Le nom de Lewis Swift est indissociable de l&#8217;essaim d&#8217;\u00e9toiles filantes des Pers\u00e9ides, des poussi\u00e8res abandonn\u00e9es par la com\u00e8te Swift-Tuttle. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Lewis Swift consacra sa vie \u00e0 traquer les astres chevelus, lui qui fut l&#8217;un des rares astronomes \u00e0 conna\u00eetre deux passages de la com\u00e8te de Halley. Accident de jeunesse : Un lourd handicap peut parfois d\u00e9velopper le caract\u00e8re d&#8217;un enfant. On peut se demander si Lewis Swift aurait \u00e9t\u00e9 l\u2019un des astronomes les plus c\u00e9l\u00e8bres &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/12\/09\/portrait-lewis-swift-celebre-chasseur-de-cometes-americain\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Portrait : Lewis Swift, c\u00e9l\u00e8bre chasseur de com\u00e8tes am\u00e9ricain<\/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":11482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[176,2760,172],"class_list":["post-11481","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-comete-swift-tuttle","tag-lewis-swift","tag-perseides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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