{"id":8181,"date":"2018-12-28T20:43:09","date_gmt":"2018-12-28T19:43:09","guid":{"rendered":"http:\/\/outters.fr\/?p=8181"},"modified":"2025-07-15T17:04:08","modified_gmt":"2025-07-15T16:04:08","slug":"ngc925","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=8181","title":{"rendered":"ngc925"},"content":{"rendered":"

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ngc925<\/strong>
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Image LRGB<\/h2><\/a><\/div><\/div><\/div>
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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\"outters-nicolas\"<\/p>\n

source wikipedia<\/p>\n

NGC 925<\/b> est une galaxie spirale barr\u00e9e<\/a> situ\u00e9e dans la constellation du Triangle<\/a> \u00e0 environ 25 millions d’ann\u00e9es-lumi\u00e8re<\/a> de la Voie lact\u00e9e<\/a>. Elle a \u00e9t\u00e9 d\u00e9couverte par l’astronome germano<\/a>–britannique<\/a> William Herschel<\/a> en 1784<\/a>.<\/p>\n

NGC 925 a \u00e9t\u00e9 utilis\u00e9 par G\u00e9rard de Vaucouleurs<\/a> comme une galaxie de type morphologique<\/a> SAB(s)d dans son atlas des galaxies7<\/a><\/sup>.<\/p>\n

La classe de luminosit\u00e9<\/a> de NGC 925 est IV et elle pr\u00e9sente une large raie HI<\/a>. Elle renferme \u00e9galement des r\u00e9gions d’hydrog\u00e8ne ionis\u00e9<\/a>. La base de donn\u00e9es NASA\/IPAC<\/a> soutient que c’est une galaxie du champ<\/a>, c’est-\u00e0-dire qu’elle n’appartient pas \u00e0 un amas<\/a> ou un groupe<\/a> et qu’elle est donc gravitationnellement isol\u00e9e.1<\/a><\/sup> Il s’agit sans doute d’une erreur, car NGC 925 fait partie du groupe de NGC 1023<\/a>.<\/p>\n

Pr\u00e8s d’une soixantaine de mesures non bas\u00e9es sur le d\u00e9calage vers le rouge<\/a> (redshift<\/i>) donnent une distance de 7,849\u00a0\u00b1\u00a01,944\u00a0Mpc<\/a><\/abbr> (\u223c25,6\u00a0millions\u00a0d’a.l.<\/a><\/abbr>) 8<\/a><\/sup>, ce qui est \u00e0 l’int\u00e9rieur des distances calcul\u00e9es en employant la valeur du d\u00e9calage 2<\/a><\/sup>.<\/p>\n

NGC 925 fait partie du groupe de NGC 1023<\/a> situ\u00e9 dans le superamas de la Vierge<\/a> qui est aussi appel\u00e9 Superamas local. Ce groupe comprend entre autres les galaxies NGC 891<\/a>, NGC 949<\/a>, NGC 959<\/a>, NGC 1003<\/a>, NGC 1023<\/a>, NGC 1058<\/a> et IC 239<\/a>9<\/a><\/sup>.<\/p>\n

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Donn\u00e9es techniques
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Donn\u00e9es techniques de prise de vue<\/h2><\/div>
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Object : ngc925
\nCommon name :
\nDate images Du 16 octobre 2017 (10 poses) au 3 janvier 20197
\nOptics : Rcos 12.5″
\nMount : Paramount ME Num\u00e9ro 3
\nLocation : Sirene observatory
\nSeeing : fwhm : 1.5 \u00e0 2.71 arc sec \/pixel
\nCcd : Apogee 16U
\nfilter wheel : Apogee
\nfilters : Astrodon
\nL rvb
\nFocuser :TIM
\nGuiding : Atik 314L+
\nTemp. out : T\u00b0
\nTemp ccd : -25\u00b0
\nTotal exposure : 33.66 h
\ntout en binning 1×1
\nRouge 29 x 5′ \/ vert 17 x 5′ \/ bleu 18 x 5′
\nL : 85 x 20′<\/p>\n<\/div><\/div><\/div>

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Donn\u00e9es scientifiques<\/h2><\/div>
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\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>\nTriangle<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n02h<\/sup>\u00a027m<\/sup>\u00a016,9s<\/sup>1<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n33\u00b0\u00a034\u2032\u00a045\u2033<\/td>\n<\/tr>\n
Distance<\/th>\n7,6\u00a0\u00b1\u00a00,6\u00a0Mpc<\/a><\/abbr> (\u223c24,8\u00a0millions\u00a0d’a.l.<\/a><\/abbr>) 2<\/a><\/sup><\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V)<\/small><\/th>\n9,9 3<\/a><\/sup>
\n10,6 dans la Bande B<\/a> 3<\/a><\/sup><\/td>\n<\/tr>\n
Brillance de surface<\/a><\/th>\n14,2\u00a0mag<\/a>\/as<\/a>2<\/sup>3<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions apparentes (V)<\/small><\/th>\n10,5\u2032<\/a> \u00d7 5,9\u2032<\/a><\/td>\n<\/tr>\n
D\u00e9calage vers le rouge<\/a><\/th>\n+0,001845 \u00b1 0,0000101<\/a><\/sup><\/td>\n<\/tr>\n
Angle de position<\/th>\n102\u00b03<\/a><\/sup><\/td>\n<\/tr>\n
Vitesse radiale<\/a><\/th>\n553 \u00b1 3\u00a0km\/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 barr\u00e9e<\/a><\/td>\n<\/tr>\n
Type de galaxie<\/a><\/th>\nSAB(s)d1<\/a><\/sup> SBcd3<\/a><\/sup> SBcd?5<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions<\/th>\n75 000 a.l.6<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9couverte<\/th>\n<\/tr>\n
D\u00e9couvreur(s)<\/th>\nWilliam Herschel<\/a> 5<\/a><\/sup><\/td>\n<\/tr>\n
Date<\/th>\n13 septembre 1784 5<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9signation(s)<\/th>\nPGC<\/a> 9332
\nMCG<\/a> 5-6-45
\nUGC<\/a> 1913
\nZWG 504.85
\nKARA 105
\nKUG 0224+333
\nIRAS02243+3321 3<\/a><\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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