{"id":5929,"date":"2017-05-27T05:57:33","date_gmt":"2017-05-27T04:57:33","guid":{"rendered":"http:\/\/outters.fr\/?p=5929"},"modified":"2025-07-15T17:04:10","modified_gmt":"2025-07-15T16:04:10","slug":"ngc4151-ngc4145","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=5929","title":{"rendered":"ngc4151 – ngc4145"},"content":{"rendered":"

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ngc4151 – ngc4145<\/strong>
\n<\/span><\/p><\/h2><\/span>

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\"ngc4151\"<\/a><\/span><\/div><\/div><\/div>
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Image LRGB<\/h2><\/a><\/div><\/div><\/div>
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Image L<\/h2><\/a><\/div><\/div><\/div>
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Image L invers\u00e9e bas niveaux<\/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

NGC 4151<\/b> est une galaxie spirale interm\u00e9diaire<\/a> situ\u00e9e \u00e0 environ\u00a019 Mpc<\/a><\/abbr><\/span> (\u223c62\u00a0millions d’ a.l.<\/a>)<\/abbr><\/span> de la Terre<\/a>2<\/a><\/sup> dans la constellation des Chiens de chasse<\/a>. La galaxie a \u00e9t\u00e9 mentionn\u00e9e pour la premi\u00e8re fois par William Herschel<\/a> le 17 mars 1787.<\/p>\n

Elle est l’une des galaxies les plus proches de la Terre \u00e0 contenir un trou noir supermassif<\/a> en croissance. Son noyau comporterait un trou noir binaire<\/a> de 10 millions et 40 millions de masses solaire<\/a> orbitant sur une p\u00e9riode de 15,8 ans3<\/a><\/sup>.<\/p>\n

Certains astronomes ont surnomm\u00e9 cette galaxie l’\u00ab\u00a0\u0152il de Sauron<\/a><\/b>\u00a0\u00bb en raison de sa forme particuli\u00e8re<\/sup>.<\/p>\n

Il aura fallu 4 longs mois pour imager cette zone. La m\u00e9t\u00e9o n’a pas \u00e9t\u00e9 favorable avec des nuits parfois capricieuses et o\u00f9 il a fallu jongler avec les diff\u00e9rents flats de cette p\u00e9riode.<\/p>\n

J’ai d\u00e9cid\u00e9 de cumuler les L et les RGB pour cr\u00e9er une luminance artificielle, cette luminance a permis de gagner en rapport signal\/bruit et a permit en partie de faire ressortir les zones tr\u00e8s t\u00e9nues autour de la galaxie ngc4151.<\/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 : ngc4151<\/span>
\nCommon name :
\nDate : images du 31-12-2016 au 22-04-2017
\nOptics : Newton SV400 F3,8
\nMount : Paramount ME Num\u00e9ro 1
\nLocation : Orange observatory
\nSeeing FWHM : 2.31 \u00e0 2.90
\nCcd : Moravian G4
\nfilter wheel : Moravian
\nfilters : Astrodon
\nLRVB
\nFocuser :Atlas
\nGuiding : Atik 314L+
\nTemp. out : T\u00b0 de -2 \u00e0 +14\u00b0
\nTemp ccd : -25\u00b0
\nTotal exposure :6.6 h
\ntout en binning 1×1
\nLuminance 28 x 10 mn + 12 RGB
\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
Donn\u00e9es d\u2019observation
\n(\u00c9poque<\/a> J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nChiens de chasse<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n12h<\/sup>\u00a010m<\/sup>\u00a032,6s<\/sup>1<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n39\u00b0\u00a024\u2032\u00a021\u2033 1<\/a><\/sup><\/td>\n<\/tr>\n
Distance<\/th>\nenviron\u00a019 Mpc<\/a><\/abbr><\/span> (\u223c62\u00a0millions d’ a.l.<\/a>)<\/abbr><\/span>2<\/a><\/sup><\/td>\n<\/tr>\n
Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n
Type d’objet<\/th>\nGalaxie<\/a><\/td>\n<\/tr>\n
Type de galaxie<\/a><\/th>\nSpirale interm\u00e9diaire<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/th>\n<\/tr>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n
NGC 4145<\/strong><\/div>\n<\/td>\n<\/tr>\n
Observation data (J2000<\/a>[1]<\/a><\/sup> epoch<\/a>)<\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nCanes Venatici<\/a>[2]<\/a><\/sup><\/td>\n<\/tr>\n
Right ascension<\/a><\/th>\n12h<\/sup>\u00a010m<\/sup>\u00a001.52s<\/sup>[1]<\/a><\/sup><\/td>\n<\/tr>\n
Declination<\/a><\/th>\n39\u00b0\u00a053\u2032\u00a001.9\u2033[1]<\/a><\/sup><\/td>\n<\/tr>\n
Redshift<\/a><\/th>\n0.003366[1]<\/a><\/sup><\/td>\n<\/tr>\n
Distance<\/a><\/th>\n68,000,000 light years<\/a>[2]<\/a><\/sup><\/td>\n<\/tr>\n
Apparent magnitude<\/a>\u00a0(V)<\/small><\/th>\n11.30[3]<\/a><\/sup><\/td>\n<\/tr>\n
Characteristics<\/th>\n<\/tr>\n
Type<\/a><\/th>\nSAB(rs)d[1]<\/a><\/sup><\/td>\n<\/tr>\n
Apparent size<\/a>\u00a0(V)<\/small><\/th>\n5.9′ x 4.1′[3]<\/a><\/sup><\/td>\n<\/tr>\n
Other designations<\/th>\n<\/tr>\n
UGC 7154[3]<\/a><\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/th>\n<\/td>\n<\/tr>\n
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