{"id":7375,"date":"2017-02-21T09:25:04","date_gmt":"2017-02-21T09:25:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7375"},"modified":"2017-03-04T10:03:21","modified_gmt":"2017-03-04T10:03:21","slug":"deux-curieuses-galaxies-sillage-de-comete-45p","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/21\/deux-curieuses-galaxies-sillage-de-comete-45p\/","title":{"rendered":"Deux curieuses galaxies dans le sillage de la com\u00e8te 45P"},"content":{"rendered":"

Traversant la constellation des Chiens de Chasse, la com\u00e8te 45P a crois\u00e9 deux \u00e9tonnantes galaxies, NGC 4631 (la Baleine) et NGC 4656 (la Crosse de hockey).<\/strong><\/p>\n

De son vrai nom 45P\/Honda-Mrkos-Pajdusakova, la com\u00e8te 45P (une com\u00e8te p\u00e9riodique qui revient nous voir\u00a0tous les 5,25 ans), est pass\u00e9e \u00e0 sa plus courte distance de la Terre (12 millions de km soit 0,09 UA) le 11 f\u00e9vrier. L’astre chevelu de magnitude 7 \u00e9tait un peu moins brillant que pr\u00e9vu en raison de son passage \u00e0 proximit\u00e9 du Soleil<\/a> (80 millions de km soit 0,533 UA) le 31 d\u00e9cembre dernier, un rapprochement qui avait vaporis\u00e9 une couche importante de poussi\u00e8re et de glace \u00e0 la surface du noyau com\u00e9taire.<\/p>\n

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

Les astrophotographes exp\u00e9riment\u00e9s n’ont pas h\u00e9sit\u00e9 \u00e0 imager la belle voyageuse verte (une couleur provoqu\u00e9e par\u00a0la forte \u00e9mission de carbone diatomique), comme le montre ce clich\u00e9 de l’autrichien Michael J\u00e4ger<\/a>, un sp\u00e9cialiste de la photographie com\u00e9taire.<\/p>\n

R\u00e9alis\u00e9e le 17 f\u00e9vrier, cette image r\u00e9v\u00e8le la com\u00e8te 45P passant devant la constellation bor\u00e9ale des Chiens de Chasse, “Canes Venatici<\/em>” en latin (\u00e0 l’OUEST de la Grande Ourse<\/a>), alors qu’au fond se d\u00e9tachent deux curieuses galaxies, NGC 4631 et NGC 4656.<\/p>\n

La premi\u00e8re (NGC 4631 en haut \u00e0 droite) est surnomm\u00e9e la galaxie de la Baleine en raison d’un l\u00e9ger renflement dans sa structure allong\u00e9e qui \u00e9voque la forme du c\u00e9l\u00e8bre c\u00e9tac\u00e9. Il s’agit d’une galaxie spirale vue par la tranche distante d’environ 30 millions d’ann\u00e9es-lumi\u00e8re de la Terre. Elle a comme compagnon la petite galaxie elliptique NGC 4621 juste au-dessus.<\/p>\n

Dans le sillage de la faible queue de la com\u00e8te 45P on trouve une seconde galaxie d\u00e9form\u00e9e, NGC 4656, qui a la forme d’une crosse de hockey.<\/p>\n

Pr\u00e9cisons enfin que la com\u00e8te et les \u00e9toiles dans le champ sont bien plus proches de nous que les deux galaxies, dont les matricules font r\u00e9f\u00e9rence \u00e0 leur enregistrement dans le New General Catalog of Nebulae and Clusters of Stars<\/em>, un catalogue astronomique contenant 7.840 objets c\u00e9lestes \u00e9tabli par l’astronome John Dreyer \u00e0 la fin du XIXe si\u00e8cle.<\/p>\n","protected":false},"excerpt":{"rendered":"

Traversant la constellation des Chiens de Chasse, la com\u00e8te 45P a crois\u00e9 deux \u00e9tonnantes galaxies, NGC 4631 (la Baleine) et NGC 4656 (la Crosse de hockey). De son vrai nom 45P\/Honda-Mrkos-Pajdusakova, la com\u00e8te 45P (une com\u00e8te p\u00e9riodique qui revient nous voir\u00a0tous les 5,25 ans), est pass\u00e9e \u00e0 sa plus courte distance de la Terre (12 … Continuer la lecture de Deux curieuses galaxies dans le sillage de la com\u00e8te 45P<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7376,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1931,2067,2089,2091,895,2092,2090,2087,2088],"class_list":["post-7375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-45phonda-mrkos-pajdusakova","tag-comete-45p","tag-constellation-des-chiens-de-chasse","tag-galaxie-de-la-baleine","tag-michael-jager","tag-new","tag-ngc-4621","tag-ngc-4631","tag-ngc-4656"],"yoast_head":"\nDeux curieuses galaxies dans le sillage de la 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