{"id":4613,"date":"2016-09-10T17:02:29","date_gmt":"2016-09-10T16:02:29","guid":{"rendered":"http:\/\/outters.fr\/?p=4613"},"modified":"2025-07-15T17:04:11","modified_gmt":"2025-07-15T16:04:11","slug":"m31","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=4613","title":{"rendered":"m31"},"content":{"rendered":"

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m31<\/strong>
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\"m31\"<\/a><\/span><\/div><\/div><\/div>
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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\"outters-nicolas\"Encore un classique me direz vous, je manque d’inspiration ? non, mais elle est tentante la grande et belle galaxie d’Androm\u00e8de !
\nJe savais que \u00e7a allait entrer tout juste dans le capteur de la Proline 16803 ! h\u00e9 bien il en fallait de peu quand m\u00eame !<\/p>\n

C’est la premi\u00e8re fois que je fais une luminance artificielle avec les RGB, juste surtout pour avoir le centre de la galaxie non satur\u00e9e.<\/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 :Messier 31
\nCommon name : Grande galaxie d’Androm\u00e8de
\nDate : du 26\/09\/2011 au 02\/10\/2011
\nOptics :Tec140 F7
\nMount : Paramount ME Num\u00e9ro 2
\nLocation : Orange observatory
\nSeeing : 2,2 \u00e0 3,7
\nCcd : Proline 16803
\nfilter wheel :FLI
\nfilters : Astrodon LRGB
\nFocuser :Robofocus
\nGuiding : ST7
\nTemp. out : +0 \u00e0 +10\u00b0
\nTemp ccd : -35\u00b0 et -30\u00b0
\nTotal exposure : 25,5 h
\nL synth\u00e9tique :
\n39 x 20 mn b1x1 + RGB
\nred : 25×10 mn b1x1
\nGreen : 25 x 10mn mn b1x1
\nBlue : 25 x 10 mn b1x1<\/div><\/div><\/div>
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Donn\u00e9es scientifiques<\/h2><\/div>
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La galaxie d’Androm\u00e8de<\/b>, \u00e9galement identifi\u00e9e sous les num\u00e9ros M31<\/b> et NGC 224<\/b>, est une galaxie spirale<\/a> situ\u00e9e \u00e0 environ 2,55\u00a0millions<\/span> d’ann\u00e9es-lumi\u00e8re<\/a> du Soleil<\/a>, dans la constellation d’Androm\u00e8de<\/a>.<\/p>\n

Appel\u00e9e Grande N\u00e9buleuse d\u2019Androm\u00e8de<\/b> jusqu’\u00e0 ce que sa nature galactique<\/a> ait \u00e9t\u00e9 reconnue dans les ann\u00e9es 1920<\/a>, la galaxie d’Androm\u00e8de est la galaxie spirale la plus proche de la Voie lact\u00e9e<\/a>9<\/a><\/sup> et la plus grande galaxie du Groupe local<\/a> dont toutes deux font entre autres partie. D’un diam\u00e8tre approximatif de 140\u00a0000\u00a0ann\u00e9es-lumi\u00e8re<\/a><\/span>, elle contiendrait environ mille milliards d’\u00e9toiles10<\/a><\/sup>.<\/p>\n

Avec une magnitude visuelle<\/a> de 3,4, la galaxie d’Androm\u00e8de est l\u2019une des rares galaxies visibles \u00e0 l’\u0153il nu<\/a> depuis la Terre<\/a> dans l\u2019h\u00e9misph\u00e8re nord<\/a>. C\u2019est \u00e9galement un des objets les plus \u00e9tendus de la vo\u00fbte c\u00e9leste<\/a>, avec un diam\u00e8tre apparent<\/a> de 3,18\u00b0, soit plus de six fois le diam\u00e8tre apparent de la Lune<\/a><\/sup><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
La galaxie d’Androm\u00e8de (M31) avec deux satellites\u00a0:
\nM32<\/a> (disque n\u00e9buleux au bord sup\u00e9rieur droit), et
\nM110<\/a> (petite galaxie elliptique<\/a> en dessous de M31).<\/td>\n<\/tr>\n
D\u00e9couverte<\/th>\n<\/tr>\n
D\u00e9couvreur(s)<\/th>\nAl-Soufi<\/a>1<\/a><\/sup><\/td>\n<\/tr>\n
Date<\/th>\n~ 964 \u00e0 Ispahan<\/a><\/td>\n<\/tr>\n
D\u00e9signations<\/th>\nM<\/a> 31
\nNGC<\/a> 224
\nPGC<\/a> 2557
\nMCG<\/a>+07-02-016
\nUGC<\/a> 454<\/td>\n<\/tr>\n
Observation
\n(\u00c9poque J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n
Ascension droite<\/a><\/th>\n00h<\/sup>\u00a042m<\/sup>\u00a044,330s<\/sup>2<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a><\/th>\n+41\u00b0\u00a016\u2032\u00a007,50\u20332<\/a><\/sup><\/td>\n<\/tr>\n
Coordonn\u00e9es galactiques<\/a><\/th>\n\u2113<\/a><\/i> = 121,1743 \u00b7<\/span> b<\/a><\/i> = -21,5733<\/span>2<\/a><\/sup><\/td>\n<\/tr>\n
Vitesse radiale<\/a><\/th>\n-301\u00a0km\/s<\/a><\/span>2<\/a><\/sup><\/td>\n<\/tr>\n
Distance<\/th>\n778\u00b117<\/small>\u00a0kpc<\/a><\/span> (\u223c2,54\u00a0millions d’\u00a0a.l.<\/a>)<\/span>3<\/a><\/sup>,<\/sup>4<\/a><\/sup>,<\/sup>5<\/a><\/sup>,<\/sup>6<\/a><\/sup><\/td>\n<\/tr>\n
Magnitude app.<\/a><\/th>\n3,4<\/td>\n<\/tr>\n
Dimensions app.<\/th>\n190‘<\/a> \u00d7 60′<\/span>7<\/a><\/sup><\/td>\n<\/tr>\n
Constellation<\/a><\/th>\nAndrom\u00e8de<\/a><\/td>\n<\/tr>\n
Caract\u00e9ristiques<\/th>\n<\/tr>\n
Type<\/a><\/th>\nSA(s)b<\/a>7<\/a><\/sup><\/td>\n<\/tr>\n
Masse<\/th>\n(1.23+1.8<\/sup>\u22120.6<\/sub>)\u00d71012<\/sup> M\u2609<\/sub><\/a>8<\/a><\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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