{"id":1541,"date":"2017-10-20T22:07:28","date_gmt":"2017-10-20T21:07:28","guid":{"rendered":"http:\/\/kawallaby.com\/?p=1541"},"modified":"2017-10-20T22:08:41","modified_gmt":"2017-10-20T21:08:41","slug":"1541","status":"publish","type":"post","link":"https:\/\/kawallaby.com\/index.php\/2017\/10\/20\/1541\/","title":{"rendered":"Falls of Orionides Fest"},"content":{"rendered":"<p>[et_pb_section admin_label=\u00a0\u00bbsection\u00a0\u00bb][et_pb_row admin_label=\u00a0\u00bbLigne\u00a0\u00bb][et_pb_column type=\u00a0\u00bb2_3&Prime;][et_pb_text admin_label=\u00a0\u00bbTexte\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb]<\/p>\n<p><em>Petit rappel d&rsquo;un article paru il y a 1 an ! Eh oui d\u00e9j\u00e0 de nouveau les Orionides :<\/em><\/p>\n<p>Du 2 octobre au 7 novembre, c&rsquo;est ce que le Wallaby appelle la <strong>Falls of Orionides Fest<\/strong> ! Mais qu&rsquo;est-ce que cette histoire ?<\/p>\n<p>C&rsquo;est l&rsquo;histoire d&rsquo;une pluie d&rsquo;\u00e9toiles filantes ayant lieu chaque ann\u00e9e, surtout\u00a0aux alentours du 21 octobre.<\/p>\n<p>Ces \u00ab\u00a0\u00e9toiles\u00a0\u00bb, et ce m\u00eame si elles brillent ardemment dans la nuit, n&rsquo;en sont pas. Bien plus modestes, elles ne sont que de la poussi\u00e8re \u00e0 l&rsquo;\u00e9chelle de notre\u00a0syst\u00e8me solaire, car elles ne sont que fragments de roches, de bien petites tailles qui plus est. Aussi ces roches, lorsqu&rsquo;elles p\u00e9n\u00e8trent dans l&rsquo;atmosph\u00e8re terrestre, se mettent \u00e0 br\u00fbler sous l&rsquo;effet des frottements avec l&rsquo;air, et les flammes en surgissant cr\u00e9ent cette queue de lumi\u00e8re bien connue et propre aux \u00e9toiles filantes.<\/p>\n<p><strong>Mais d&rsquo;o\u00f9 viennent-elles ?<\/strong><\/p>\n<p>Les Orionides sont les poussi\u00e8res que la com\u00e8te de Haley &#8211;\u00a0un rocher glac\u00e9 de\u00a0la taille d&rsquo;une\u00a0grande\u00a0ville &#8211;\u00a0d\u00e9laisse sur son chemin, et que la plan\u00e8te Terre traverse chaque ann\u00e9e, toujours \u00e0 la m\u00eame p\u00e9riode. Il en tombe une vingtaine par heure aux alentours du 21 octobre, et il est particuli\u00e8rement ais\u00e9 d&rsquo;en voir pour les habitants de l&rsquo;h\u00e9misph\u00e8re Nord de notre plan\u00e8te, si l&rsquo;on est patient, en observant du c\u00f4t\u00e9 de la constellation d&rsquo;Orion (image).<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_3&Prime;][et_pb_image admin_label=\u00a0\u00bbImage\u00a0\u00bb src=\u00a0\u00bbhttp:\/\/kawallaby.com\/wp-content\/uploads\/2016\/10\/600px-Orion_3008_huge.jpg\u00a0\u00bb show_in_lightbox=\u00a0\u00bboff\u00a0\u00bb url_new_window=\u00a0\u00bboff\u00a0\u00bb use_overlay=\u00a0\u00bboff\u00a0\u00bb animation=\u00a0\u00bboff\u00a0\u00bb sticky=\u00a0\u00bboff\u00a0\u00bb align=\u00a0\u00bbleft\u00a0\u00bb force_fullwidth=\u00a0\u00bboff\u00a0\u00bb always_center_on_mobile=\u00a0\u00bbon\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb title_text=\u00a0\u00bbPhotographie de la constellation d&rsquo;Orion\u00a0\u00bb] [\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=\u00a0\u00bbLigne\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_4&Prime;][et_pb_image admin_label=\u00a0\u00bbImage\u00a0\u00bb src=\u00a0\u00bbhttp:\/\/kawallaby.com\/wp-content\/uploads\/2016\/10\/05934644-photo-stellarium-logo.jpg.png\u00a0\u00bb show_in_lightbox=\u00a0\u00bboff\u00a0\u00bb url=\u00a0\u00bbhttp:\/\/www.stellarium.org\/\u00a0\u00bb url_new_window=\u00a0\u00bboff\u00a0\u00bb use_overlay=\u00a0\u00bboff\u00a0\u00bb animation=\u00a0\u00bboff\u00a0\u00bb sticky=\u00a0\u00bboff\u00a0\u00bb align=\u00a0\u00bbleft\u00a0\u00bb force_fullwidth=\u00a0\u00bboff\u00a0\u00bb always_center_on_mobile=\u00a0\u00bbon\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb] [\/et_pb_image][\/et_pb_column][et_pb_column type=\u00a0\u00bb3_4&Prime;][et_pb_text admin_label=\u00a0\u00bbTexte\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb]<\/p>\n<p><strong>Dans quelles conditions les observer ?<\/strong><\/p>\n<p>Lorsque le Soleil s&rsquo;est couch\u00e9 et que le ciel n&rsquo;est pas voil\u00e9, id\u00e9alement aux alentours du 21 octobre et dans une zone peu \u00e9clair\u00e9e par les lumi\u00e8res urbaines, les Orionides peuvent \u00eatre observ\u00e9es comme si elles chutaient du haut de ce dessin form\u00e9 par les \u00e9toiles appel\u00e9 la constellation d&rsquo;Orion (image ci-dessus).<\/p>\n<p>Si tu ne sais pas trop comment retrouver cette constellation dans le ciel, utilise l&rsquo;excellent logiciel freeware <strong><a href=\"http:\/\/www.stellarium.org\/\">Stellarium<\/a><\/strong>, dont il existe de tr\u00e8s bonnes notices sur le site officiel ou sur le net, tout simplement.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=\u00a0\u00bbrow\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime;][et_pb_text admin_label=\u00a0\u00bbAuteur Photo\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb text_font_size=\u00a0\u00bb11&Prime; text_text_color=\u00a0\u00bb#4f4f4f\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb]<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Auteur de la photographie en t\u00eate de page : ESO\/G. Brammer<\/p>\n<p>[\/et_pb_text][et_pb_text admin_label=\u00a0\u00bbExplications photo\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb text_font_size=\u00a0\u00bb9&Prime; text_text_color=\u00a0\u00bb#6d6d6d\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb]<\/p>\n<p>This impressive picture was taken on 5 March 2013 by Gabriel Brammer, one of the ESO Photo Ambassadors, and shows a sunset view of the Paranal Observatory, featuring two comets that are currently moving across the southern skies. Close to the horizon, on the right-hand side of the image, Comet C\/2011 L4 (Pan-STARRS), the brightest of the two, shows a bright tail that is caused mainly by dust reflecting the sunlight. In the centre of the image, just above the right-hand slopes of Cerro Paranal, the greenish coma \u2014 a nebulous envelope around the nucleus \u2014 of Comet C\/2012 F6 (Lemmon) can be distinguished, followed by a fainter tail. The green colour is a result of the ionisation of gases in the coma by sunlight. You might even be tricked into thinking that there is a third comet visible in this photo, but the bright object whizzing between comets Lemmon and Pan-STARRS is a serendipitous shooting star burning up in the atmosphere at just the right time and in the right place.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=\u00a0\u00bbLigne\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime;][et_pb_text admin_label=\u00a0\u00bbAuteur Photo\u00a0\u00bb background_layout=\u00a0\u00bblight\u00a0\u00bb text_orientation=\u00a0\u00bbleft\u00a0\u00bb text_font_size=\u00a0\u00bb11&Prime; text_text_color=\u00a0\u00bb#4f4f4f\u00a0\u00bb use_border_color=\u00a0\u00bboff\u00a0\u00bb border_color=\u00a0\u00bb#ffffff\u00a0\u00bb border_style=\u00a0\u00bbsolid\u00a0\u00bb]<\/p>\n<p>Auteur de la photographie\u00a0de la constellation d&rsquo;Orion\u00a0: Mouser<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Petit rappel d&rsquo;un article paru il y a 1 an ! Eh oui d\u00e9j\u00e0 de nouveau les Orionides : Du 2 octobre au 7 novembre, c&rsquo;est ce que le Wallaby appelle la Falls of Orionides Fest ! Mais qu&rsquo;est-ce que cette histoire ? C&rsquo;est l&rsquo;histoire d&rsquo;une pluie d&rsquo;\u00e9toiles filantes ayant lieu chaque ann\u00e9e, surtout\u00a0aux alentours [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[34,11],"tags":[],"_links":{"self":[{"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/posts\/1541"}],"collection":[{"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/comments?post=1541"}],"version-history":[{"count":3,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/posts\/1541\/revisions"}],"predecessor-version":[{"id":1545,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/posts\/1541\/revisions\/1545"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/media?parent=1541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/categories?post=1541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kawallaby.com\/index.php\/wp-json\/wp\/v2\/tags?post=1541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}