{"id":9270,"date":"2018-12-14T16:53:29","date_gmt":"2018-12-14T16:53:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9270"},"modified":"2019-01-02T10:25:53","modified_gmt":"2019-01-02T10:25:53","slug":"rotation-detoiles-autour-pole-sud-celeste","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/14\/rotation-detoiles-autour-pole-sud-celeste\/","title":{"rendered":"Rotation d’\u00e9toiles autour du p\u00f4le sud c\u00e9leste"},"content":{"rendered":"

L’un des photographes de l’ESO a r\u00e9alis\u00e9 une rotation d’\u00e9toiles centr\u00e9e sur le p\u00f4le sud c\u00e9leste depuis l’Observatoire de la Silla au Chili.<\/strong><\/p>\n

C\u2019est \u00e0 2.400 m\u00e8tres d\u2019altitude, \u00e0 600 kilom\u00e8tres au nord de Santiago du Chili, que l\u2019Observatoire Europ\u00e9en Austral (ESO<\/a>) a implant\u00e9 l’Observatoire de La Silla et ses premi\u00e8res coupoles dans les ann\u00e9es 1960. Le plus gros t\u00e9lescope h\u00e9berg\u00e9 sur ce site a un diam\u00e8tre de 3,6 m\u00e8tres. L\u2019ESO dispose en outre d\u2019un site au Paranal (toujours au Chili, \u00e0 2.600 m\u00e8tres d\u2019altitude, \u00e0 130 km au sud d\u2019Antofagasta) qui h\u00e9berge ses 4 t\u00e9lescopes g\u00e9ants\u00a0VLT<\/a>.<\/p>\n

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

Le photographe\u00a0Petr Hor\u00e1lek<\/a> (connu aussi pour ses superbes images du ciel nocturne dans le d\u00e9sert du\u00a0Kalahari<\/a>) s’est rendu \u00e0 La Silla pour y r\u00e9aliser une rotation d’\u00e9toiles centr\u00e9e sur le p\u00f4le sud c\u00e9leste.<\/p>\n

Sur cette image on remarque la pr\u00e9sence de trois coupoles de gauche \u00e0 droite : celle qui abrite le t\u00e9lescope MPG\/ESO de 2,2 m\u00e8tres (qui a photographi\u00e9 la n\u00e9buleuse de la Crevette<\/a>), celle du t\u00e9lescope de 3,6 m\u00e8tres dans le fond et celle du t\u00e9lescope danois \u00e0 droite qui masque le p\u00f4le sud c\u00e9leste et la c\u00e9l\u00e8bre petite constellation de la Croix du Sud<\/a>.<\/p>\n

Alors que la Voie lact\u00e9e<\/a> se d\u00e9ploie sans limite dans un ciel exempt de toute pollution lumineuse<\/a>, le regard est attir\u00e9 par deux petites taches blanches au-dessus de la coupole danoise : il s’agit des Nuages de Magellan<\/a>,\u00a0deux galaxies naines dans la forme\u00a0 irr\u00e9guli\u00e8re s\u2019explique par les forces gravitationnelles exerc\u00e9es par notre Galaxie, leur imposante et plus proche voisine \u00e0 moins de 200.000 ann\u00e9es-lumi\u00e8re.\u00a0C\u2019est au cours de son grand tour de l\u2019Am\u00e9rique du Sud entre 1519 et 1522 que le navigateur portugais Fernand de Magellan mentionna dans son journal de bord l\u2019existence de ces deux petites n\u00e9buleuses qui prirent ensuite son nom, honneur qui aurait d\u00fb revenir \u00e0 l\u2019astronome perse Al-Soufi qui les avaient signal\u00e9es 500 ans plus t\u00f4t.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’un des photographes de l’ESO a r\u00e9alis\u00e9 une rotation d’\u00e9toiles centr\u00e9e sur le p\u00f4le sud c\u00e9leste depuis l’Observatoire de la Silla au Chili. C\u2019est \u00e0 2.400 m\u00e8tres d\u2019altitude, \u00e0 600 kilom\u00e8tres au nord de Santiago du Chili, que l\u2019Observatoire Europ\u00e9en Austral (ESO) a implant\u00e9 l’Observatoire de La Silla et ses premi\u00e8res coupoles dans les ann\u00e9es … Continuer la lecture de Rotation d’\u00e9toiles autour du p\u00f4le sud c\u00e9leste<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[635,633,843,892,1420,2522,166],"class_list":["post-9270","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-chili","tag-eso","tag-nuages-de-magellan","tag-observatoire-de-la-silla","tag-petr-horalek","tag-pole-sud-celeste","tag-voie-lactee"],"yoast_head":"\nRotation d'\u00e9toiles autour du p\u00f4le sud 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