{"id":1065,"date":"2007-11-16T14:27:00","date_gmt":"2007-11-16T13:27:00","guid":{"rendered":"https:\/\/kids.esa.int\/brief_homecoming_for_esa_s_comet_chaser\/"},"modified":"2026-10-08T00:35:30","modified_gmt":"2026-10-07T22:35:30","slug":"brief_homecoming_for_esa_s_comet_chaser","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/brief_homecoming_for_esa_s_comet_chaser\/","title":{"rendered":"Bref retour \u00e0 la maison pour le chasseur de com\u00e8te de l'ESA"},"content":{"rendered":"<div class=\"lede\">\n<p>Une vieille amie est venue nous rendre une br\u00e8ve visite le 13 novembre. 44 mois apr\u00e8s sont lancement de la base de Kourou, en Guyane, la sonde Rosetta de l'ESA a survol\u00e9 la Terre pour la deuxi\u00e8me fois. La sonde europ\u00e9enne a \u00e0 ce jour parcouru un peu plus de 3 milliards de km, mais il lui en reste encore 4 milliards \u00e0 parcourir avant d'arriver \u00e0 destination, la com\u00e8te 67\/P Churyumov-Gerasimenko, en 2014.<\/p>\n<\/div>\n<p>Rosetta rebondit dans notre syst\u00e8me solaire comme une boule de billard alors qu'elle prend de la vitesse et modifie sa trajectoire lors de son rapprochement de la Terre et de Mars. Ce r\u00e9cent \u00e9v\u00e9nement dans ce voyage \u00e9pique correspondait au troisi\u00e8me des quatre survols pr\u00e9vus pour Rosetta.<\/p>\n<p>Apr\u00e8s un r\u00e9glage pr\u00e9cis de son orbite gr\u00e2ce \u00e0 l'allumage de ses propulseurs pendant 42 secondes le 18 octobre, le positionnement de la sonde \u00e9tait impeccable pour le survol de notre plan\u00e8te. A 21h57 (heure de Paris), lanc\u00e9e \u00e0 une vitesse de 45 000 km\/h (12,5 km\/s), la sonde de 3 tonnes est pass\u00e9e au-dessus de notre plan\u00e8te. Alors qu'elle survolait l'oc\u00e9an Pacifique, au sud-ouest du Chili, Rosetta n'\u00e9tait qu'\u00e0 5 295 km au-dessus de nos t\u00eates.<\/p>\n<p>Au moment d'effectuer son passage le plus proche, Rosetta a bien \u00e9tudi\u00e9 la Terre, en profitant pour observer son atmosph\u00e8re et sa magn\u00e9tosph\u00e8re, pour photographier des r\u00e9gions urbaines et pour rep\u00e9rer des m\u00e9t\u00e9ores dans l'espace. Lorsqu'elle elle a commenc\u00e9 \u00e0 s'\u00e9loigner, elle a alors entam\u00e9 une s\u00e9rie d'observations du syst\u00e8me Terre-Lune.<\/p>\n<p>La sonde va maintenant \u00eatre catapult\u00e9e vers le syst\u00e8me solaire externe avant de revenir vers la Terre pour la derni\u00e8re fois en novembre 2009. Mais avant cela, Rosetta en profitera pour \u00e9tudier de pr\u00e8s l'ast\u00e9ro\u00efde Steins en septembre 2008 lorsqu'elle croisera la ceinture d'ast\u00e9ro\u00efdes.<\/p>","protected":false},"excerpt":{"rendered":"<p>An old friend returned home for a flying visit on 13 November. 44 months after its launch from Kourou, French Guiana, ESA\u2019s Rosetta spacecraft swept past the Earth for the [&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\/2007\/11\/swing-by_animation2\/17881992-2-eng-GB\/Swing-by_animation.jpg","esa_banner_description":"Swing-by animation","esa_banner_credit":"ESA - C. 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