{"id":10449,"date":"2023-09-04T14:17:37","date_gmt":"2023-09-04T14:17:37","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/galaxie-du-feu-dartifice\/"},"modified":"2025-06-08T22:43:56","modified_gmt":"2025-06-08T20:43:56","slug":"galaxie-du-feu-dartifice","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/galaxie-du-feu-dartifice\/","title":{"rendered":"Galaxie du Feu d’Artifice"},"content":{"rendered":"

NGC 6946, surnomm\u00e9e la galaxie du Feu d’artifice, est une galaxie spirale interm\u00e9diaire vue presque de face et situ\u00e9e \u00e0 cheval sur les constellations du Cygne et de C\u00e9ph\u00e9e, \u00e0 environ 20 millions d’ann\u00e9es-lumi\u00e8re de la Voie lact\u00e9e.
\nC’est une galaxie active de type Seyfert 2, et renferme des r\u00e9gions d’hydrog\u00e8ne ionis\u00e9 (HII).
\nCe sont des galaxies spirales caract\u00e9ris\u00e9es par un noyau extr\u00eamement brillant et compact. D’une brillance de surface tr\u00e8s \u00e9lev\u00e9e, leur noyau repr\u00e9sente l’une des plus grandes sources de rayonnement \u00e9lectromagn\u00e9tique connues de l’Univers, possiblement li\u00e9e au trou noir supermassif en leur centre.
\nCes galaxies pr\u00e9sentent des \u00e9missions fortes dans les domaines radio, ultraviolet, infrarouge et rayons X du spectre \u00e9lectromagn\u00e9tique.
\nSon bulbe central orang\u00e9 est compos\u00e9 de vieilles \u00e9toiles alors que le bleu de jeunes amas stellaires domine dans les bras spiraux. Le rouge r\u00e9v\u00e8le la pr\u00e9sence de zones o\u00f9 naissent les \u00e9toiles.
\nCette galaxie est le si\u00e8ge de \u00ab fr\u00e9quentes \u00bb supernovas, dix ayant \u00e9t\u00e9 observ\u00e9es depuis 1917, soit 10 fois le taux de la Voie lact\u00e9e.
\nD\u2019o\u00f9 son surnom de la galaxie du feu d’artifice.
\nImages prisent en 2022 et cette ann\u00e9e. M\u00e9t\u00e9o et Lune, comme d’habitude, emp\u00eachent de r\u00e9aliser plusieurs sessions d’affil\u00e9e…
\nImage en LRGB + Ha. Cette image est rogn\u00e9e, la galaxie n’\u00e9tant quand m\u00eame pas si grande dans mon champ.<\/p>\n

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

Technique:<\/p>\n

L: 41 – R: 34 – G: 28 – B: 29 – Ha: 20 – Toutes en poses de 300 sec.
\nTotal: 12.66 Heures<\/p>\n

T\u00e9lescope Skywatcher 250\/1200 – Monture AZEQ6 – Cam\u00e9ra: ZWO 1600MM Pro – Guidage: ZWO 120 MM Mini + Lunette Artesky 70\/ 400 –
\nNINA – PHD2 – GSS – SharpCap pour Polar align. – Stellarium –
\nProcess: Pixinsight + PShop.<\/p>\n

Richard Hendrick<\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

NGC 6946, surnomm\u00e9e la galaxie du Feu d’artifice, est une galaxie spirale interm\u00e9diaire vue presque de face et situ\u00e9e \u00e0 cheval sur les constellations du Cygne et de C\u00e9ph\u00e9e, \u00e0 environ 20 millions d’ann\u00e9es-lumi\u00e8re de la Voie lact\u00e9e. C’est une galaxie active de type Seyfert 2, et renferme des r\u00e9gions d’hydrog\u00e8ne ionis\u00e9 (HII). Ce sont […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-10449","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10449"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10449\/revisions"}],"predecessor-version":[{"id":11237,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10449\/revisions\/11237"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}