{"id":4176,"date":"2020-02-18T07:24:26","date_gmt":"2020-02-18T06:24:26","guid":{"rendered":"http:\/\/www.arnaudom.fr\/wordpress\/?page_id=4176"},"modified":"2026-04-18T09:17:47","modified_gmt":"2026-04-18T07:17:47","slug":"m101apn","status":"publish","type":"page","link":"https:\/\/www.arnaudom.fr\/wordpress\/m101apn\/","title":{"rendered":"m101apn"},"content":{"rendered":"\t\t
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La galaxie M101 dans la Grande Ourse<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Quatre images sur cette page.
Les images sont class\u00e9es de la plus r\u00e9cente \u00e0 la moins r\u00e9cente.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Photographi\u00e9e en avril 2026.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Astrom\u00e9trie sur M101<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Newton TS Carbone 200\/800 + Monture EQ6 Pro + ZWO 1600 Pro + Paracorr Televue + Filtres LRGB
Autoguidage : lunette Skywatcher 80\/400 + Zwo 120 mini
41 x 3 min L + 10 x 3 min R + 10 x 3 min G + 10 x 3 min B + 50 dark + 15 flat par filtre<\/span><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Revoil\u00e0 la grande galaxie M101 dans la Grande Ourse, dont la position printani\u00e8re la met en bonne position pour \u00eatre photographi\u00e9e (et observ\u00e9e, bien que son faible contraste demande un ciel bien noir pour pouvoir en profiter, malgr\u00e9 sa grande taille apparente). Le script d’astrom\u00e9trie de Pixinsight nous montre 9 objets, tous r\u00e9pertori\u00e9s au catalogue NGC, qui sont en r\u00e9alit\u00e9 des objets qui font partie de la galaxie M101 elle-m\u00eame !  NGC 5449 est un amas d’\u00e9toiles, tandis que les autres sont des n\u00e9buleuses en \u00e9mission appartenant \u00e0 M101. Donc en plus de la galaxie elle-m\u00eame, la photo nous permet d’observer 9 autres objets extra-galactiques !<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Photographi\u00e9e en avril 2014.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Gros plan sur M101<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Newton GSO 200\/800 + Monture EQ6 Pro + Canon EOS 350D d\u00e9filtr\u00e9 + Paracorr Televue
Autoguidage : chercheur 8×50 + bague + Orion Starshoot Autoguider
28 poses de 4 minutes + 11 dark + 15 flat + 51 offset<\/span><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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M101 fait partie des cibles int\u00e9ressantes avec un APN et une petite focale, \u00e9tant donn\u00e9e la grande taille de cette galaxie. Cependant son faible contraste ne la rend pas particuli\u00e8rement facile \u00e0 observer ni \u00e0 photographier. Les acquisitions pour cette image ont \u00e9t\u00e9 faites en Bretagne en avril 2014.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Photographi\u00e9e en mai 2012.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Newton GSO 200\/800 + Monture EQ6 Pro + Canon EOS 350D d\u00e9filtr\u00e9 + Paracorr Televue
Autoguidage : chercheur 8×50 + bague + Orion Starshoot Autoguider
24 poses de 3 minutes + 11 offset + 10 dark + 10 flat<\/span><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Voici une nouvelle image de la grande galaxie M101 dans la Grande Ourse. Par rapport \u00e0 mon image pr\u00e9c\u00e9dente, celle-ci b\u00e9n\u00e9ficie de toutes les am\u00e9liorations apport\u00e9es par la monture EQ6 et l’autoguidage en terme de suivi, et par l’utilisation du Paracorr et des flats en terme de qualit\u00e9 de l’image. Le r\u00e9sultat n’est pas encore parfait, en particulier la mise au point est un peu rat\u00e9e. Cependant on est sur la bonne voie… A noter que les acquisitions pour cette image ont \u00e9t\u00e9 faites lors des RAP 2012 ! Ce qui prouve qu’on peut faire de l’astronomie aux RAP contrairement \u00e0 ce que dit une rumeur persistante…<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Photographi\u00e9e en mai 2010.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Newton GSO 200\/800 + Monture Sky View Pro + Canon EOS 350D
84 poses de 50 secondes + 15 offset + 15 dark<\/span><\/strong><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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J’ai choisi cette grande galaxie situ\u00e9e dans la Grande Ourse pour tester ma nouvelle interface \u00ab\u00a0longue pose\u00a0\u00bb pour le Canon. J’ai pu ainsi faire des poses de 50 secondes pour imager M101. L’autre int\u00e9r\u00eat de cette galaxie, mise \u00e0 part sa grande taille, est qu’elle poss\u00e8de plusieurs bras spiraux ce qui la rend tr\u00e8s esth\u00e9tique en photo. L’absence de flat se fait cruellement sentir, ce qui se voit sur la couleur du fond du ciel qui n’est pas du tout uniforme, et ce qui entra\u00eene aussi une perte de d\u00e9tail. Il est temps que je m’attelle \u00e0 ce probl\u00e8me ! Une petite galaxie appara\u00eet en bas \u00e0 droite de M101.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t<\/i>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\tRetour \u00e0 la galerie<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

La galaxie M101 dans la Grande Ourse Quatre images sur cette page.Les images sont class\u00e9es de la plus r\u00e9cente \u00e0 la moins r\u00e9cente. Photographi\u00e9e en avril 2026. Astrom\u00e9trie sur M101 Newton TS Carbone 200\/800 + Monture EQ6 Pro + ZWO 1600 Pro + Paracorr Televue + Filtres LRGBAutoguidage : lunette Skywatcher 80\/400 + Zwo 120 …<\/p>\n

m101apn<\/span> Lire la suite\u00a0\u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-4176","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/pages\/4176","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/comments?post=4176"}],"version-history":[{"count":8,"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/pages\/4176\/revisions"}],"predecessor-version":[{"id":17565,"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/pages\/4176\/revisions\/17565"}],"wp:attachment":[{"href":"https:\/\/www.arnaudom.fr\/wordpress\/wp-json\/wp\/v2\/media?parent=4176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}