{"id":15743,"date":"2022-05-09T17:35:25","date_gmt":"2022-05-09T17:35:25","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15743"},"modified":"2022-05-30T16:17:58","modified_gmt":"2022-05-30T16:17:58","slug":"ngc-7331-une-galaxie-spirale-bien-entouree-dans-pegase","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/09\/ngc-7331-une-galaxie-spirale-bien-entouree-dans-pegase\/","title":{"rendered":"NGC 7331, une galaxie spirale bien entour\u00e9e dans P\u00e9gase"},"content":{"rendered":"<p><strong>Dans le champ de NGC 7331, une belle spirale situ\u00e9e du c\u00f4t\u00e9 de P\u00e9gase, on observe plusieurs autres galaxies, en r\u00e9alit\u00e9 bien plus \u00e9loign\u00e9es.\u00a0<\/strong><\/p>\n<h5>Carte d&#8217;identit\u00e9 :<\/h5>\n<p>NGC 7331 a \u00e9t\u00e9 d\u00e9couverte le 6 septembre 1785 par l&#8217;astronome germano-britannique <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>. Cette belle <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-galaxie-spirale-42\/\" target=\"_blank\" rel=\"noopener\">galaxie spirale<\/a> de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 10 fait partie de\u00a0l\u2019imposant\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-ngc-6380\/\" target=\"_blank\" rel=\"noopener\"><em>New General Catalogue of Nebulae and Clusters of Stars<\/em><\/a> qui regroupe pr\u00e8s de 8.000 objets du ciel profond. Initi\u00e9 par l\u2019astronome irlando-danois John Dreyer, ce catalogue fit l\u2019objet d\u2019une premi\u00e8re \u00e9dition en 1888. La galaxie est \u00e9galement r\u00e9f\u00e9renc\u00e9e comme Caldwell 30 dans le catalogue de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/09\/patrick-moore-le-gentleman-de-lastronomie-britannique\/\" target=\"_blank\" rel=\"noopener\">Patrick Moore<\/a>.<\/p>\n<figure id=\"attachment_15744\" aria-describedby=\"caption-attachment-15744\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331.jpg\" rel=\"lightbox[15743]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15744\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/galaxie_ngc7331.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15744\" class=\"wp-caption-text\">NGC 7331 est entour\u00e9e de galaxies beaucoup plus lointaines. \u00a9 Johannes Schedler<\/figcaption><\/figure>\n<p>NGC 7331 se situe dans la constellation de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/12\/pour-mesurer-la-qualite-du-ciel-comptez-les-etoiles-dans-pegase\/\" target=\"_blank\" rel=\"noopener\">P\u00e9gase<\/a>, au Sud d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/09\/le-telescope-hubble-zoome-sur-la-galaxie-d-andromede\/\" target=\"_blank\" rel=\"noopener\">Androm\u00e8de<\/a>. Sous un bon ciel et avec un gros t\u00e9lescope, la galaxie r\u00e9v\u00e8le son fuseau lumineux sur 10X4 minutes d&#8217;arc. Dans les ann\u00e9es 1930, l&#8217;astronome am\u00e9ricain <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-edwin-hubble-715\/\" target=\"_blank\" rel=\"noopener\">Edwin Hubble<\/a> proposa de classer les galaxies selon des crit\u00e8res morphologiques. Caldwell 30 appartient \u00e0 la cat\u00e9gorie SAb, une galaxie spirale interm\u00e9diaire entre galaxie spirale r\u00e9guli\u00e8re et galaxie spirale barr\u00e9e.<!--more--><\/p>\n<h5>Lointaines voisines :<\/h5>\n<p>Avec un diam\u00e8tre de 120.000 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>, Caldwell 30 rappelle beaucoup ce que nous verrions de notre propre galaxie (la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/16\/le-rubin-observatory-en-majeste-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a>) si nous pouvions nous en \u00e9loigner. Elle est \u00e9galement tr\u00e8s photog\u00e9nique, comme le prouve ce clich\u00e9 r\u00e9alis\u00e9 par Johannes Schedler (<a href=\"http:\/\/panther-observatory.com\/\" target=\"_blank\" rel=\"noopener\"><em>Panther-Observatory<\/em><\/a>). Cet astrophotographe n&#8217;a pas h\u00e9sit\u00e9 \u00e0 cumuler une vingtaines d&#8217;heures de poses avec un t\u00e9lescope de 35 centim\u00e8tres de diam\u00e8tre pour r\u00e9v\u00e9ler la beaut\u00e9 de NGC 7331 et de ses voisines.<\/p>\n<figure id=\"attachment_15746\" aria-describedby=\"caption-attachment-15746\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331.jpg\" rel=\"lightbox[15743]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15746\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331-450x259.jpg\" alt=\"\" width=\"450\" height=\"259\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331-450x259.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331-1024x590.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331-768x443.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331-1536x886.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/carte_galaxie_ngc7331.jpg 2000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15746\" class=\"wp-caption-text\">Rep\u00e9rage de NGC 7331 et de ses voisines. \u00a9 SkySafari 6 Pro\/STScI Digitized Sky Survey<\/figcaption><\/figure>\n<p>Car Cadwell 30 n&#8217;est pas seule : pas moins de cinq petites galaxies l&#8217;accompagnent. En moyenne, elles sont dix fois plus \u00e9loign\u00e9es de nous que ne l&#8217;est Cadwell 30. Regroup\u00e9es sous l&#8217;appellation <em>Deer Lick Group<\/em>, elles sont aussi beaucoup plus faibles. Avec des magnitudes comprises entre 14 et 15, elles n\u00e9cessitent un t\u00e9lescope d&#8217;au moins 30 centim\u00e8tres de diam\u00e8tre pour un rep\u00e9rage visuel. Enfin, terminons ce descriptif en signalant que quatre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-supernova-60\/\" target=\"_blank\" rel=\"noopener\">supernovae<\/a> ont d\u00e9j\u00e0 \u00e9t\u00e9 observ\u00e9es dans NGC 7331 : en 1903, 1959, 2013 et 2014.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/17\/ngc-4565-la-belle-galaxie-spirale-oubliee-par-charles-messier\/\" target=\"_blank\" rel=\"noopener\">NGC 4565, la belle galaxie spirale oubli\u00e9e par Charles Messier<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/\" target=\"_blank\" rel=\"noopener\">Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/22\/zoom-sur-messier-61-une-magnifique-galaxie-spirale\/\" target=\"_blank\" rel=\"noopener\">Zoom sur Messier 61, une magnifique galaxie spirale<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Dans le champ de NGC 7331, une belle spirale situ\u00e9e du c\u00f4t\u00e9 de P\u00e9gase, on observe plusieurs autres galaxies, en r\u00e9alit\u00e9 bien plus \u00e9loign\u00e9es.\u00a0 Carte d&#8217;identit\u00e9 : NGC 7331 a \u00e9t\u00e9 d\u00e9couverte le 6 septembre 1785 par l&#8217;astronome germano-britannique William Herschel. Cette belle galaxie spirale de magnitude 10 fait partie de\u00a0l\u2019imposant\u00a0New General Catalogue of Nebulae &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/09\/ngc-7331-une-galaxie-spirale-bien-entouree-dans-pegase\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">NGC 7331, une galaxie spirale bien entour\u00e9e dans P\u00e9gase<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":15744,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[328,3193,3194],"class_list":["post-15743","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-pegase","tag-johannes-schedler","tag-ngc-7331"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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