{"id":7407,"date":"2018-09-04T13:09:36","date_gmt":"2018-09-04T12:09:36","guid":{"rendered":"http:\/\/outters.fr\/?p=7407"},"modified":"2025-07-15T17:04:08","modified_gmt":"2025-07-15T16:04:08","slug":"ngc253-lrgb-ciel-austral","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=7407","title":{"rendered":"ngc253-Lrgb (Ciel Austral)"},"content":{"rendered":"

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NGC253 en L-rgb
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Donn\u00e9es techniques
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Donn\u00e9es scientifiques<\/h2><\/div>
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SOURCE WIKIPEDIA<\/p>\n

La galaxie du Sculpteur<\/b> (\u00e9galement appel\u00e9e NGC<\/a> 253<\/b> et galaxie du dollar d’argent) est une galaxie spirale interm\u00e9diaire<\/a> \u00e0 environ\u00a03,3\u00a0Mpc<\/a><\/abbr> (\u223c10,8\u00a0millions\u00a0d’a.l.<\/a><\/abbr>), visible dans la constellation<\/a> du Sculpteur<\/a>. Des mesures non bas\u00e9es sur le d\u00e9calage vers le rouge<\/a> (redshift<\/i>) donnent une distance de 3,250\u00a0\u00b1\u00a00,544\u00a0Mpc<\/a><\/abbr> (\u223c10,6\u00a0millions\u00a0d’a.l.<\/a><\/abbr>)7<\/a><\/sup>, ce qui est \u00e0 l’int\u00e9rieur des distances calcul\u00e9es en employant la valeur du d\u00e9calage2<\/a><\/sup>.<\/p>\n

C’est une galaxie \u00e0 sursauts de formation d’\u00e9toiles<\/a>, c’est-\u00e0-dire une galaxie<\/a> affichant un tr\u00e8s haut taux d’\u00e9toiles naissantes<\/a>. Elle est physiquement associ\u00e9e au groupe de galaxies<\/a> appel\u00e9 Filament du Sculpteur<\/a> (ou Groupe du Sculpteur) dont elle est le membre le plus massif. Le noyau de cette galaxie abrite probablement un trou noir supermassif<\/a> d’une masse estim\u00e9e \u00e0 5 millions de masses solaires8<\/a><\/sup>.<\/p>\n

(en)<\/abbr> \u00ab\u00a0NGC 253<\/cite>\u00a0\u00bb<\/a>\u00a0[archive<\/a>]<\/small><\/span><\/span> a \u00e9t\u00e9 utilis\u00e9 par G\u00e9rard de Vaucouleurs<\/a> comme une galaxie de type morphologique<\/a> SAB(s)c dans son atlas des galaxies.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Donn\u00e9es d\u2019observation
\n(\u00c9poque<\/a> J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nSculpteur<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n00h<\/sup>\u00a047m<\/sup>\u00a033,1s<\/sup>1<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n\u221225\u00b0\u00a017\u2032\u00a018\u2033<\/td>\n<\/tr>\n
Distance<\/th>\n3,3\u00a0\u00b1\u00a00,3\u00a0Mpc<\/a><\/abbr> (\u223c10,8\u00a0millions\u00a0d’a.l.<\/a><\/abbr>)2<\/a><\/sup><\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V)<\/small><\/th>\n7,33<\/a><\/sup>
\n8,0 dans la Bande B<\/a>3<\/a><\/sup><\/td>\n<\/tr>\n
Brillance de surface<\/a><\/th>\n12,9\u00a0mag<\/a>\/as<\/a>2<\/sup>3<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions apparentes (V)<\/small><\/th>\n29,00\u2032<\/a> \u00d7 6,8\u2032<\/a>3<\/a><\/sup><\/td>\n<\/tr>\n
Redshift<\/a><\/th>\n+0,000811 \u00b1 0,0000071<\/a><\/sup><\/td>\n<\/tr>\n
Angle de position<\/th>\n52\u00b03<\/a><\/sup><\/td>\n<\/tr>\n
Vitesse radiale<\/a><\/th>\n243 \u00b1 2\u00a0km<\/a>\/s<\/a>4<\/a><\/sup><\/td>\n<\/tr>\n
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Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n
Type d’objet<\/th>\nGalaxie spirale interm\u00e9diaire<\/a><\/td>\n<\/tr>\n
Type de galaxie<\/a><\/th>\nSAB(s)c5<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions<\/th>\n92 000 a.l6<\/a><\/sup>.<\/td>\n<\/tr>\n
D\u00e9couverte<\/th>\n<\/tr>\n
D\u00e9couvreur(s)<\/th>\nCaroline Herschel<\/a>5<\/a><\/sup><\/td>\n<\/tr>\n
Date<\/th>\n23 septembre 17835<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9signation(s)<\/th>\nPGC<\/a> 2789
\nMCG<\/a> -4-3-9
\nUGCA<\/a> 13
\nESO 474-293<\/a><\/sup>
\nCaldwell 65<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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Commentaires sur l'objet<\/h2><\/div>
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Une superbe galaxie qui m\u00e9ritait ce temps de pose.<\/p>\n<\/div><\/div><\/div>

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Image Lrgb<\/h2><\/a><\/div><\/div><\/div>
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<\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":7405,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[120,129,152,335,336,96,112],"tags":[338,360],"class_list":["post-7407","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-lrgb","category-observatoire-chili","category-toutes-categories","category-odk500","category-saison-2018","category-galaxie","category-ngc","tag-cielaustral","tag-ngc253","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/7407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7407"}],"version-history":[{"count":2,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/7407\/revisions"}],"predecessor-version":[{"id":7422,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/7407\/revisions\/7422"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/media\/7405"}],"wp:attachment":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}