{"id":2343,"date":"2015-04-10T05:04:51","date_gmt":"2015-04-10T05:04:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2343"},"modified":"2015-04-18T08:06:18","modified_gmt":"2015-04-18T08:06:18","slug":"ralf-vandeberg-lastronome-amateur-qui-traque-liss","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/10\/ralf-vandeberg-lastronome-amateur-qui-traque-liss\/","title":{"rendered":"Ralf Vandeberg, l’astronome amateur qui traque l’ISS"},"content":{"rendered":"

Dans le monde des astronomes amateurs, chacun a sa sp\u00e9cialit\u00e9 : il y a ceux qui sont amoureux du Soleil <\/a>et suivent le d\u00e9veloppement de ses taches<\/a>, d\u2019autres qui cherchent inlassablement des com\u00e8tes<\/a> pour accrocher leur nom au firmament, d\u2019autres encore qui accumulent les d\u00e9tails sur la Lune <\/a>et les plan\u00e8tes, sans parler de ceux qui collectent les rares photons de galaxies <\/a>lointaines.<\/p>\n

\"ralf2\"<\/a><\/p>\n

Le n\u00e9erlandais Ralf Vandebergh<\/a> a une toute autre marotte : il utilise son t\u00e9lescope pour filmer en haute r\u00e9solution la Station spatiale internationale.<\/p>\n

Circulant \u00e0 environ 400 kilom\u00e8tres au-dessus de nos t\u00eates, la Station spatiale internationale (ISS<\/a> en anglais pour International Space Station<\/em>) est le fruit d\u2019une coop\u00e9ration entre les agences spatiales am\u00e9ricaine, russe, europ\u00e9enne, japonaise et canadienne. L\u2019assemblage de cette structure de plus de 300 tonnes grande comme un terrain de football a commenc\u00e9 en 1998.<\/p>\n

Il est tr\u00e8s facile de suivre r\u00e9guli\u00e8rement \u00e0 l\u2019\u0153il nu le d\u00e9placement dans le ciel de l\u2019ISS (aussi brillante que Jupiter <\/a>en raison de ses nombreux panneaux solaires qui renvoient la lumi\u00e8re du Soleil vers nous) : il suffit pour cela de conna\u00eetre ses heures de passage au-dessus d\u2019un lieu donn\u00e9 en consultant le site Heavens Above<\/em><\/a>.<\/p>\n

\"ralf5\"<\/a><\/p>\n

Observer avec un t\u00e9lescope un objet \u00e0 seulement 400 km serait tr\u00e8s facile s\u2019il n\u2019y avait\u00a0pas\u00a0le mouvement propre de la Station qui se d\u00e9place \u00e0 28 000 km\/h, soit le d\u00e9placement apparent d\u2019un avion de ligne. On pourrait penser que Ralf Vandebergh a d\u00e9velopp\u00e9 un programme informatique complexe pilotant les moteurs de son t\u00e9lescope de 25 cm de diam\u00e8tre pour suivre le d\u00e9placement de l\u2019ISS.<\/p>\n

Et bien non, le suivi est manuel : l\u2019\u0153il coll\u00e9 \u00e0 l\u2019oculaire de son chercheur, l\u2019astronome cherche \u00e0 garder la Station dans son champ de vision en bougeant lentement le t\u00e9lescope pendant qu\u2019une cam\u00e9ra filme ce qu\u2019il voit dans l\u2019instrument.<\/p>\n

\"ralf1\"<\/a><\/p>\n

Pratiquant cette technique d\u2019observation depuis plusieurs ann\u00e9es, il a collect\u00e9 d\u2019\u00e9tonnantes images tr\u00e8s d\u00e9taill\u00e9es de la Station spatiale, des diff\u00e9rents cargos qui sont venus s\u2019y arrimer et il a m\u00eame pu photographier les astronautes lorsqu\u2019ils sortaient de l\u2019ISS !<\/p>\n

\"ralf4\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Dans le monde des astronomes amateurs, chacun a sa sp\u00e9cialit\u00e9 : il y a ceux qui sont amoureux du Soleil et suivent le d\u00e9veloppement de ses taches, d\u2019autres qui cherchent inlassablement des com\u00e8tes pour accrocher leur nom au firmament, d\u2019autres encore qui accumulent les d\u00e9tails sur la Lune et les plan\u00e8tes, sans parler de ceux … Continuer la lecture de Ralf Vandeberg, l’astronome amateur qui traque l’ISS<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[928,196,927,96],"class_list":["post-2343","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-astronaute","tag-iss","tag-ralf-vandebergh","tag-telescope"],"yoast_head":"\nRalf Vandeberg, l'astronome amateur qui traque 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