{"id":9515,"date":"2022-04-19T10:46:29","date_gmt":"2022-04-19T09:46:29","guid":{"rendered":"http:\/\/outters.fr\/?p=9515"},"modified":"2025-07-15T17:04:03","modified_gmt":"2025-07-15T16:04:03","slug":"ngc4088-lrgb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=9515","title":{"rendered":"ngc4088 Lrgb"},"content":{"rendered":"

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NGC4088 en Lrgb<\/strong>
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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\"outters-nicolas\"Reprise des galaxies avec le RC de Sirene. Visitez la version pleine en cliquant sur l’image et admirez les d\u00e9tails au centre de la galaxie NGC4088. A cot\u00e9 c’est la galaxie NGC4085.<\/p>\n<\/div>

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Image LRGB<\/h2><\/a><\/div><\/div><\/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 : ngc4088<\/span>
\nCommon name :
\nDate : images du 6-03 au 6-04-2022
\nOptics : Rcos 12.5″
\nMount : Paramount ME Num\u00e9ro 3
\nLocation : Sirene observatory
\nSeeing FWHM :1.95 \u00e0 2.80
\nCcd : Apogee 16U
\nfilter wheel : Apogee
\nfilters : Astrodon RVB
\nFocuser :Rcos
\nGuiding : Atik 314L+
\nTemp. out : T\u00b0 de \u00b0
\nTemp. out : T\u00b0 de -4 \u00e0 +4
\nTemp ccd : -25\u00b0
\nTotal exposure :20h30
\ntout en binning 1×1
\nLuminance 86 x 10 mn
\nRVB 25 x 5′ pour chaque filtre<\/p>\n<\/div><\/div><\/div>

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Donn\u00e9es scientifiques<\/h2><\/div>
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NGC 4088<\/b>\u00a0est une\u00a0galaxie spirale interm\u00e9diaire<\/a>\u00a0situ\u00e9e dans la\u00a0constellation de la Grande Ourse<\/a>\u00a0\u00e0 environ 34 millions d’ann\u00e9es-lumi\u00e8re<\/a>. NGC 4088 a \u00e9t\u00e9 d\u00e9couvert par l’astronome\u00a0germano<\/a>–britannique<\/a>\u00a0William Herschel<\/a>\u00a0en\u00a01788<\/a>.<\/p>\n

NGC 4088 a \u00e9t\u00e9 utilis\u00e9 par\u00a0G\u00e9rard de Vaucouleurs<\/a>\u00a0comme une galaxie de\u00a0type morphologique<\/a>\u00a0SAB(s)c pec dans son atlas des galaxies9<\/a><\/sup>,<\/sup>10<\/a><\/sup>.<\/p>\n

La\u00a0classe de luminosit\u00e9<\/a>\u00a0de NGC 4088 est II-III et elle pr\u00e9sente une large\u00a0raie HI<\/a>. Elle renferme \u00e9galement des\u00a0r\u00e9gions d’hydrog\u00e8ne ionis\u00e9<\/a>1<\/a><\/sup>.<\/p>\n

NGC 4088 est une\u00a0galaxie spirale de grand style<\/a>11<\/a><\/sup>, ce qui signifie que les bras de la galaxie sont bien d\u00e9finis. En lumi\u00e8re visible, l’un des bras de la spirale semble avoir un segment d\u00e9connect\u00e9.\u00a0Halton Arp<\/a>\u00a0a inclus cette galaxie dans l’Atlas of Peculiar Galaxies<\/a><\/i>\u00a0comme \u00e9tant l’un des nombreux exemples o\u00f9 ce ph\u00e9nom\u00e8ne se produit12<\/a><\/sup>.<\/p>\n

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La paire de galaxies, NGC 4088 (\u00e0 gauche) et NGC 4085, par Jeff Johnson, un astronome amteur.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

La galaxie NGC 4088 forme une paire avec la\u00a0NGC 4085<\/a>, situ\u00e9e \u00e0 environ 11\u00a0minutes d’arc<\/a>13<\/a><\/sup>.<\/p>\n

Plus d’une trentaine de mesures non bas\u00e9es sur le\u00a0d\u00e9calage vers le rouge<\/a>\u00a0(redshift<\/i>) donnent une distance de 13,933\u00a0\u00b1\u00a02,910\u00a0Mpc<\/a><\/abbr>\u00a0(\u223c45,4\u00a0millions d’a.l.<\/a><\/abbr>)14<\/a><\/sup>, ce qui est \u00e0 l’int\u00e9rieur des distances calcul\u00e9es en employant la valeur du d\u00e9calage5<\/a><\/sup>. Cependant, cette galaxie, comme plusieurs des groupes de M101 et de M109, est relativement rapproch\u00e9e du\u00a0Groupe local<\/a>\u00a0et on obtient presque syst\u00e9matiquement une distance inf\u00e9rieure en se basant sur le d\u00e9calage. Cela est sans doute d\u00fb \u00e0 la faible gravit\u00e9 exerc\u00e9e par le Groupe local qui contrebalance l’expansion de l’Univers<\/a>\u00a0et qui rend ainsi la\u00a0loi de Hubble-Lema\u00eetre<\/a>\u00a0moins applicable.<\/p>\n<\/div><\/div><\/div>

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