{"id":3416,"date":"2015-08-24T05:07:50","date_gmt":"2015-08-24T05:07:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3416"},"modified":"2015-11-01T08:37:55","modified_gmt":"2015-11-01T08:37:55","slug":"rotation-detoiles-au-chateau-de-la-tour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/24\/rotation-detoiles-au-chateau-de-la-tour\/","title":{"rendered":"Rotation d’\u00e9toiles au ch\u00e2teau de la Tour"},"content":{"rendered":"

Prise au pied du ch\u00e2teau de la Tour, en Bourgogne, cette image nous r\u00e9v\u00e8le la rotation apparente du ciel \u00e9toil\u00e9 en direction du p\u00f4le c\u00e9leste nord.<\/strong><\/p>\n

La Terre tourne, c’est une \u00e9vidence : chaque jour nous voyons le Soleil <\/a>se d\u00e9placer d’est en ouest et chaque nuit la Lune<\/a>, les plan\u00e8tes <\/a>et les \u00e9toiles <\/a>suivent le m\u00eame trajet. La Terre tourne en 23 h 56 mn sur elle-m\u00eame autour d’un axe imaginaire qui passe par les p\u00f4les. Si nous prolongeons cet axe imaginaire dans l’espace, il passe dans l’h\u00e9misph\u00e8re nord non loin de\u00a0\u00a0l’\u00e9toile Alpha Ursae Minoris<\/em>, la plus brillante de la constellation de la Petite Ourse. C’est pour cette raison qu’on la surnomme l’\u00e9toile polaire<\/a>.<\/p>\n

\"rotation13\"<\/a><\/p>\n

Si l’on photographie le ciel nocturne en direction de l’\u00e9toile polaire en effectuant une longue pose (plusieurs minutes), les astres vont tracer de petits arcs de cercle lumineux centr\u00e9s sur\u00a0Alpha Ursae Minoris<\/em>.<\/p>\n

Plus la pose est longue, plus les arcs de cercle sont allong\u00e9s : si l’on pouvait r\u00e9aliser une pose de 24 h les \u00e9toiles auraient fait un tour complet. Bien entendu une telle image est impossible (\u00e0 moins de s’installer au nord du cercle polaire bor\u00e9al en hiver) puisque les nuits les plus longues n’exc\u00e8dent pas 12 h sous nos latitudes.<\/p>\n

L’image que je vous propose a \u00e9t\u00e9 r\u00e9alis\u00e9e dans la nuit du 11 au 12 ao\u00fbt au pied du ch\u00e2teau de la Tour, pas tr\u00e8s loin du ch\u00e2teau du Clos de Vougeot<\/a> en Bourgogne. Cette image est la somme de 225 poses de 30 sec chacune, addition r\u00e9alis\u00e9e \u00e0 l’aide du logiciel Starmax<\/a>, comme ce fut le cas pour la rotation d’\u00e9toiles dans le ciel de la Bresse<\/a>.<\/p>\n

Le bo\u00eetier utilis\u00e9 est un Nikon D3200 muni d’un objectif de 10,5 mm de focale ouvert \u00e0 2,8. La sensibilit\u00e9 est r\u00e9gl\u00e9e sur 800 iso.<\/p>\n","protected":false},"excerpt":{"rendered":"

Prise au pied du ch\u00e2teau de la Tour, en Bourgogne, cette image nous r\u00e9v\u00e8le la rotation apparente du ciel \u00e9toil\u00e9 en direction du p\u00f4le c\u00e9leste nord. La Terre tourne, c’est une \u00e9vidence : chaque jour nous voyons le Soleil se d\u00e9placer d’est en ouest et chaque nuit la Lune, les plan\u00e8tes et les \u00e9toiles suivent … Continuer la lecture de Rotation d’\u00e9toiles au ch\u00e2teau de la Tour<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3417,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[207,762,1207,98,1197],"class_list":["post-3416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-bourgogne","tag-chateau-de-la-tour","tag-chateau-du-clos-de-vougeot","tag-etoile-polaire","tag-rotation-detoiles"],"yoast_head":"\nRotation d'\u00e9toiles au ch\u00e2teau de la Tour<\/title>\n<meta name=\"description\" content=\"Prise au pied du ch\u00e2teau de la Tour, en Bourgogne, cette image nous r\u00e9v\u00e8le 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