{"id":1012,"date":"2010-06-28T14:39:00","date_gmt":"2010-06-28T12:39:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_asteroid_and_the_disappearing_star\/"},"modified":"2026-10-08T00:34:51","modified_gmt":"2026-10-07T22:34:51","slug":"the_asteroid_and_the_disappearing_star","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/the_asteroid_and_the_disappearing_star\/","title":{"rendered":"L\u2019ast\u00e9ro\u00efde et l\u2019\u00e9toile qui dispara\u00eet"},"content":{"rendered":"<div class=\"lede\">\n<p>Le 8 juillet, une \u00e9toile relativement brillante connue sous le nom de Delta Ophiuchi dispara\u00eetra du ciel nocturne. Rien de grave toutefois. Cette \u00e9toile visible \u00e0 l\u2019\u0153il nu ne sera pas aval\u00e9e par un monstre ni \u00e0 l\u2019heure de la mort : elle sera tout simplement cach\u00e9e par un ast\u00e9ro\u00efde.<\/p>\n<\/div>\n<p>Pendant quelques secondes, ce petit morceau de roche, connu sous le nom de (472) Roma, se trouvera exactement au bon endroit et au bon moment pour masquer la lumi\u00e8re de l'\u00e9toile qui parvient jusqu'\u00e0 la Terre. Il s'agit d'un \u00e9v\u00e9nement rare : c'est la seule fois de ce si\u00e8cle o\u00f9 il sera possible d'observer un ast\u00e9ro\u00efde occulter une \u00e9toile sans l'aide de jumelles ou d'un t\u00e9lescope.<\/p>\n<p>Nous connaissons tous les \u00e9clipses solaires, lorsque la Lune passe devant le Soleil et que le ciel s\u2019obscurcit plusieurs minutes durant. M\u00eame si la Lune est 400 fois plus petite que le Soleil, elle est aussi 400 fois plus proche ce qui lui permet de couvrir tout le disque de notre plus proche \u00e9toile.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"364\" data-credit=\"NASA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/07\/A_grazing_occultation_of_Rhea_a_moon_of_Saturn_by_another_moon_Dione2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2010\/07\/a_grazing_occultation_of_rhea_a_moon_of_saturn_by_another_moon_dione2\/17872928-2-eng-GB\/A_grazing_occultation_of_Rhea_a_moon_of_Saturn_by_another_moon_Dione.jpg\" alt=\"A grazing occultation of Rhea, a moon of Saturn, by another moon, Dione\"><figcaption>Une occultation rasante de Rh\u00e9a, une lune de Saturne, par une autre lune, Dion\u00e9<\/figcaption><\/figure>\n<p>La m\u00eame chose peut se produire avec des \u00e9toiles plus \u00e9loign\u00e9es. Un ast\u00e9ro\u00efde de 50 km de large comme Roma peut cacher bri\u00e8vement une \u00e9toile de grande taille comme Delta Ophiuchi car ce petit caillou spatial est bien plus proche de nous. Les \u00e9v\u00e8nements de ce type sont importants car ils permettent aux astronomes d\u2019estimer la taille et la forme des ast\u00e9ro\u00efdes, notamment celles de ceux qui pourraient un jour entrer en collision avec la Terre.<\/p>\n<p>La disparition de Delta Ophiuchi ne sera visible que le long d\u2019un couloir d\u2019environ 50 km de large qui reliera Stockholm, Copenhague, Br\u00eame, Nantes, Bilbao et les \u00celes Canaries. Elle se produira \u00e0 environ 23h57 heure de Paris m\u00eame si l\u2019heure exacte variera selon le lieu.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1008\" data-credit=\"Credits: ESA, created with Guide 8 by Project Pluto http:\/\/www.projectpluto.com\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/07\/Star_chart_showing_the_sky_from_central_Europe2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2010\/07\/star_chart_showing_the_sky_from_central_europe2\/18249399-2-eng-GB\/Star_chart_showing_the_sky_from_central_Europe.jpg\" alt=\"Star chart showing the sky from central Europe\"><figcaption>Carte du ciel repr\u00e9sentant le ciel vu depuis l'Europe centrale<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>On 8 July, a fairly bright star, known as Delta Ophiuchi, will disappear from the night sky. However, there is no need to worry. The naked eye star is not [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2003\/04\/asteroids_come_in_many_shapes_and_sizes2\/17886580-2-eng-GB\/Asteroids_come_in_many_shapes_and_sizes.jpg","esa_banner_description":"Asteroids come in many shapes and sizes","esa_banner_credit":"courtesy Observatoire de Paris","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Asteroids_come_in_many_shapes_and_sizes2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[46,10,11],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1012","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1012","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=1012"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1012\/revisions"}],"predecessor-version":[{"id":4795,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1012\/revisions\/4795"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1012"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1012"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1012"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1012"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1012"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1012"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1012"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1012"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1012"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}