{"id":11178,"date":"2019-09-23T15:44:34","date_gmt":"2019-09-23T15:44:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11178"},"modified":"2019-10-05T06:26:09","modified_gmt":"2019-10-05T06:26:09","slug":"spectaculaire-image-du-rapprochement-entre-deux-cometes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/23\/spectaculaire-image-du-rapprochement-entre-deux-cometes\/","title":{"rendered":"Spectaculaire image du rapprochement entre deux com\u00e8tes"},"content":{"rendered":"

Le 8 septembre dernier les com\u00e8tes 260P\/McNaught et C\/2018 N2 (ASASSN) se trouvaient dans un coin de la constellation du B\u00e9lier.<\/strong><\/p>\n

Deux lointaines voyageuses :<\/h5>\n

Les com\u00e8tes du moment sont tr\u00e8s discr\u00e8tes : aucune n’est visible dans une paire de jumelles<\/a>, encore moins \u00e0 l’\u0153il nu. Que les nostalgiques de Hale-Bopp<\/a> ou de Hyakutake<\/a> passent leur chemin ! Seuls les astrophotographes aguerris peuvent capturer les astres chevelus qui traversent actuellement le Syst\u00e8me solaire. Il aura fallu tout le talent de Gerald Rhemann<\/a> pour saisir le rapprochement apparent entre deux lointaines voyageuses dans la constellation du B\u00e9lier (\u00e0 l’ouest des Pl\u00e9iades<\/a>) le 8 septembre.<\/p>\n

\"\"<\/a>
Les com\u00e8tes 260P\/McNaught et C\/2018 N2 ( ASASSN ). \u00a9 Gerald Rhemann<\/figcaption><\/figure>\n

Cet astrophotographe autrichien qui utilise un t\u00e9lescope install\u00e9 en Namibie est un sp\u00e9cialiste des belles images de com\u00e8tes. Il a par exemple immortalis\u00e9 les volutes gazeuses et poussi\u00e9reuses de C\/2016 R2<\/a> ou encore Swan et Lovejoy<\/a>.<\/p>\n

D\u00e9couvertes r\u00e9centes :<\/h5>\n

260P\/McNaught est une com\u00e8te p\u00e9riodique d\u00e9couverte le 20 mai 2005 depuis l’observatoire australien de Siding Spring<\/a> par l’astronome Robert H. McNaught. Elle revient nous voir tous les sept ans. C\/2018 N2 (ASASSN) a \u00e9t\u00e9 d\u00e9tect\u00e9e le 7 juillet 2018 dans le cadre du All-Sky Automated Survey for SuperNovae<\/em>. L’ASASSN se compose d’une vingtaine de t\u00e9l\u00e9objectifs de 400 millim\u00e8tres de focale plac\u00e9s chacun devant une cam\u00e9ra CCD. Ils peuvent d\u00e9tecter des supernovae<\/a> jusqu’\u00e0 la magnitude<\/a> 18. Ils sont install\u00e9s dans des observatoires des deux h\u00e9misph\u00e8res pour surveiller tout le ciel.<\/p>\n

Du c\u00f4t\u00e9 du B\u00e9lier :<\/h5>\n

Le rapprochement apparent des deux com\u00e8tes le 8 septembre s’est produit \u00e0 proximit\u00e9 de l’\u00e9toile Hamal (\u03b1 Arietis<\/em>) situ\u00e9e en dehors du champ de cette image. L’\u00e9toile la plus brillante du B\u00e9lier est une g\u00e9ante orange quinze fois plus grande que le Soleil<\/a> et quatre-vingt-dix fois plus brillante. Les deux astres chevelus, d’une magnitude comprise entre 12 et 13, ont n\u00e9cessit\u00e9 un total de poses de 50 minutes avec un t\u00e9lescope motoris\u00e9 de 305 millim\u00e8tres de diam\u00e8tre.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 8 septembre dernier les com\u00e8tes 260P\/McNaught et C\/2018 N2 (ASASSN) se trouvaient dans un coin de la constellation du B\u00e9lier. Deux lointaines voyageuses : Les com\u00e8tes du moment sont tr\u00e8s discr\u00e8tes : aucune n’est visible dans une paire de jumelles, encore moins \u00e0 l’\u0153il nu. Que les nostalgiques de Hale-Bopp ou de Hyakutake passent … Continuer la lecture de Spectaculaire image du rapprochement entre deux com\u00e8tes<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11179,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2718,2719,2720,758],"class_list":["post-11178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-comete-260p-mcnaught","tag-comete-c-2018-n2-asassn","tag-constellation-du-belier","tag-gerald-rhemann"],"yoast_head":"\nSpectaculaire image du rapprochement entre deux com\u00e8tes<\/title>\n<meta name=\"description\" content=\"Le 8 septembre dernier les com\u00e8tes 260P\/McNaught et C\/2018 N2 (ASASSN) se trouvaient dans un coin de la constellation du B\u00e9lier.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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