{"id":10565,"date":"2024-04-14T16:50:04","date_gmt":"2024-04-14T15:50:04","guid":{"rendered":"http:\/\/outters.fr\/?p=10565"},"modified":"2025-07-15T17:03:59","modified_gmt":"2025-07-15T16:03:59","slug":"zone-ngc37389-en-lrgb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=10565","title":{"rendered":"Zone NGC3738 en Lrgb"},"content":{"rendered":"

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Zone NGC3738 en Lrgb
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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Une zone du ciel peu imag\u00e9e et pourtant si riche en galaxies les plus diverses<\/strong><\/p>\n

Voici la carte annotate des galaxies pr\u00e9sentes sur l’image !<\/p>\n

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Lien image LRGB<\/h2><\/a><\/div><\/div><\/div>
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Image LRGB annotate<\/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 :Zone NGC3738
\nDate : images du 13 mars au 14 avril 2024
\nOptics :OO400 Newton F3,8
\nMount : Paramount ME Num\u00e9ro 1
\nLocation : Orange observatory
\nSeeing : FWHM de arc sec(Maxselector)
\nCcd : Moravian G4 16803
\nfilter wheel :Moravian
\nfilters : Astrodon LRVB
\nFocuser :FLI Atlas
\nGuiding : SkyMeca DO et Atik 314L+
\nTemp. out : 10 \u00b0\u00e0 20\u00b0
\nTemp ccd : -25\u00b0
\nTotal exposure : 22\u00a0 h
\nLuminance 66 x 10 mn
\nR 44 x 5 mn bining 1\u00d71
\nV 44 x 5 mn bining 1\u00d71
\nB 44 x 5 mn bining 1\u00d71<\/p>\n<\/div><\/div><\/div>

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Donn\u00e9es scientifiques<\/h2><\/div>
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Source Wikipedia<\/p>\n

NGC 3738<\/b>\u00a0est une\u00a0galaxie irr\u00e9guli\u00e8re<\/a>\u00a0naine bleue compacte<\/a>\u00a0situ\u00e9e dans la\u00a0constellation de la Grande Ourse<\/a>. Sa vitesse par rapport au\u00a0fond diffus cosmologique<\/a>\u00a0est de\u00a0412<\/span>\u00a0\u00b1\u00a012<\/span>\u00a0km\/s<\/abbr>, ce qui correspond \u00e0 une\u00a0distance de Hubble<\/a>\u00a0de 6,07\u00a0\u00b1\u00a00,46\u00a0Mpc<\/a><\/abbr>\u00a0(\u223c19,8\u00a0millions d’al<\/a><\/abbr>)1<\/a><\/sup>. NGC 3738 a \u00e9t\u00e9 d\u00e9couverte par l’astronome\u00a0germano<\/a>–britannique<\/a>\u00a0William Herschel<\/a>\u00a0en\u00a01789<\/a>.<\/p>\n

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NGC 3738 par le\u00a0t\u00e9lescope spatial Hubble<\/a>.<\/figcaption><\/figure>\n
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NGC 3738 dans le domaine de l’infrarouge<\/a>\u00a0par le\u00a0t\u00e9lescope spatial Hubble<\/a>.<\/figcaption><\/figure>\n
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La\u00a0classe de luminosit\u00e9<\/a>\u00a0de NGC 3733 est V-VI et elle pr\u00e9sente une large\u00a0raie HI<\/a>1<\/a><\/sup>. Elle renferme \u00e9galement des\u00a0r\u00e9gions d’hydrog\u00e8ne ionis\u00e9<\/a>1<\/a><\/sup>.<\/p>\n

Selon la base de donn\u00e9es\u00a0Simbad<\/a>, NGC 428 est une\u00a0galaxie \u00e0 noyau actif<\/a>6<\/a><\/sup>.<\/p>\n

\u00c0 ce jour, sept mesures non bas\u00e9es sur le\u00a0d\u00e9calage vers le rouge<\/a>\u00a0(redshift<\/i>) donnent une distance de 4,211\u00a0\u00b1\u00a01,211\u00a0Mpc<\/a><\/abbr>\u00a0(\u223c13,7\u00a0millions d’al<\/a><\/abbr>)3<\/a><\/sup>, ce qui est l\u00e9g\u00e8rement \u00e0 l’ext\u00e9rieur des valeurs de la\u00a0distance de Hubble<\/a>. Mais, puisque cette galaxie est tr\u00e8s rapproch\u00e9e du\u00a0Groupe local<\/a>, il est fort probable que cette valeur soit plus pr\u00e8s de la distance r\u00e9elle de NGC 3738. Notons que c’est avec la valeur moyenne des mesures ind\u00e9pendantes, lorsqu’elles existent, que la base de donn\u00e9es\u00a0NASA\/IPAC<\/a>\u00a0calcule le diam\u00e8tre d’une galaxie.<\/p>\n<\/div><\/div><\/div>

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