{"id":5649,"date":"2017-04-10T20:47:39","date_gmt":"2017-04-10T19:47:39","guid":{"rendered":"http:\/\/outters.fr\/?p=5649"},"modified":"2025-07-15T17:04:10","modified_gmt":"2025-07-15T16:04:10","slug":"ngc891","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=5649","title":{"rendered":"ngc891"},"content":{"rendered":"

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ngc891<\/strong>
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\"ngc891\"<\/a><\/span><\/div><\/div><\/div>
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Image LRGB<\/h2><\/a><\/div><\/div><\/div>
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Image L<\/h2><\/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

NGC 891<\/b> est une galaxie spirale<\/a> vue par la tranche et situ\u00e9e dans la constellation d’Androm\u00e8de<\/a>. Elle a \u00e9t\u00e9 d\u00e9couverte par l’astronome germano-britannique William Herschel<\/a> en 1784<\/a>.
\nNGC 891 a \u00e9t\u00e9 utilis\u00e9 par G\u00e9rard de Vaucouleurs<\/a> comme une galaxie de type morphologique<\/a> Sb sp dans son atlas des galaxies7<\/a><\/sup>.<\/p>\n

NGC 891 est une galaxie active<\/a> qui pr\u00e9sente un jet d’onde radio1<\/a><\/sup>.<\/p>\n

NGC 891 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 925<\/a>, NGC 949<\/a>, NGC 959<\/a>, NGC 1003<\/a>, NGC 1023<\/a>, NGC 1058<\/a> et IC 239<\/a><\/p>\n

Les conditions en RGB n’\u00e9taient pas trop bonnes, des FWHM pas terrible avec une belle s\u00e9rie d’astig sur la couche rouge et bleue.<\/p>\n<\/div>

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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 : ngc891<\/span>
\nCommon name :
\nDate : images du 1-14-2016 au 03-01-2017
\nOptics : Newton SV400 F3,8
\nMount : Paramount ME Num\u00e9ro 1
\nLocation : Orange observatory
\nSeeing FWHM : 2.23 \u00e0 3.42
\nCcd : Moravian G4
\nfilter wheel : Moravian
\nfilters : Astrodon
\nLRVB
\nFocuser :Atlas
\nGuiding : Atik 314L+
\nTemp. out : T\u00b0 de -2 \u00e0 +8\u00b0
\nTemp ccd : -25\u00b0
\nTotal exposure :12.8h
\ntout en binning 1×1
\nLuminance 61 x 10 mn
\nRVB 4 x 10′ x 3<\/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
Donn\u00e9es d\u2019observation
\n(\u00c9poque<\/a> J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nAndrom\u00e8de<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n02h<\/sup>\u00a022m<\/sup>\u00a033,4s<\/sup>1<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n42\u00b0\u00a020\u2032\u00a057\u2033<\/td>\n<\/tr>\n
Distance<\/th>\n7,2\u00a0\u00b1\u00a00,5\u00a0Mpc<\/a><\/span> (\u223c23,5\u00a0millions d’\u00a0a.l.<\/a>)<\/span> 2<\/a><\/sup><\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V)<\/small><\/th>\n10,1 3<\/a><\/sup>
\n10,9 dans la Bande B<\/a> 3<\/a><\/sup><\/td>\n<\/tr>\n
Brillance de surface<\/a><\/th>\n12,9\u00a0mag<\/a>\/as<\/a>\u00b23<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions apparentes (V)<\/small><\/th>\n11,7\u2032<\/a> \u00d7 1,6\u2032<\/a><\/td>\n<\/tr>\n
Redshift<\/a><\/th>\n+0,001761 \u00b1 0,0000131<\/a><\/sup><\/td>\n<\/tr>\n
Angle de position<\/th>\n22\u00b03<\/a><\/sup><\/td>\n<\/tr>\n
Vitesse radiale<\/a><\/th>\n528 \u00b1 4\u00a0km<\/a>\/s<\/a>4<\/a><\/sup><\/td>\n<\/tr>\n
Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n
Type d’objet<\/th>\nGalaxie spirale<\/a><\/td>\n<\/tr>\n
Type de galaxie<\/a><\/th>\nSb? 5<\/a><\/sup><\/td>\n<\/tr>\n
Dimensions<\/th>\n80 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>\n6 octobre 1784 5<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9signation(s)<\/th>\nPGC<\/a> 9031
\nUGC<\/a> 1831
\nMCG<\/a> 7-5-46
\nZWG 538.52
\nIRAS02195+4209 3<\/a><\/sup>
\nCaldwell 23<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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