{"id":4133,"date":"2016-08-07T17:16:32","date_gmt":"2016-08-07T16:16:32","guid":{"rendered":"http:\/\/outters.fr\/?p=4133"},"modified":"2025-07-15T17:04:12","modified_gmt":"2025-07-15T16:04:12","slug":"ngc6888","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=4133","title":{"rendered":"ngc6888"},"content":{"rendered":"

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ngc6888<\/strong>
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\"ngc6888\"<\/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\"Voici une image faite avec notre t\u00e9lescope Rcos install\u00e9 \u00e0 l’observatoire Sirene en plein Lub\u00e9ron.
\nEn 2012, le TCC a lach\u00e9 et il fallu le changer et refaire enti\u00e8rement l’installation du focuser, ensuite il a fallu refaire compl\u00e8tement la collimation des miroirs. L\u00e0 dessus on met un printemps pourri de chez pourri et on a une ann\u00e9e sans image !
\nLes poses ont repris en juin 2013 avec la n\u00e9buleuse du croissant NGC6888 en narrowband.<\/p>\n

Didier et moi-m\u00eame avons pos\u00e9 30 heures \u00e0 raison de poses unitaires de 20 minutes.
\nOn en a profit\u00e9 pour virer CcdAutopilot et installer Maxpilot qui va bien mieux.<\/p>\n<\/div>

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Image SHO<\/h2><\/a><\/div><\/div><\/div>

Image Ha<\/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 :NGC6888
\nCommon name : Crescent Nebulae
\nDate : du 5 juin au 2 juillet 2013 sur 10 nuits
\nOptics :Rcos 12″
\nMount : Paramount ME Num\u00e9ro 3
\nLocation : Castor Sirene observatory
\nSeeing : FWHM de 1,85 \u00e0 3,2 arc sec(ccdinspector)
\nCcd : Apogee 16803
\nfilter wheel :Apogee
\nfilters : Astrodon HaSIIOIII
\nFocuser :TIM Rcos
\nGuiding : MMOAG Astrodon et Atik 314L+
\nTemp. out : 10 \u00b0\u00e0 20\u00b0
\nTemp ccd : -20\u00b0
\nTotal exposure : 30 h
\nHalpha 34 x 20mn bining 1×1
\nSII 19 x 20 mn bining 1×1
\nOIII 33 x 20 mn bining 1×1<\/div><\/div><\/div>
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Donn\u00e9es scientifiques<\/h2><\/div>
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La n\u00e9buleuse du Croissant<\/b> (NGC<\/a> 6888) est une n\u00e9buleuse en \u00e9mission<\/a> situ\u00e9e dans la constellation du Cygne<\/a>, \u00e0 environ 5\u00a0000 ann\u00e9es-lumi\u00e8re<\/a>2<\/a><\/sup>. Elle est issue des rapides vents solaires<\/a> cr\u00e9\u00e9s par l’\u00e9toile Wolf-Rayet<\/a> WR 136<\/a>\u00a0(en)<\/span><\/a>, qui -par collision- ionisent les vents plus lents de cette m\u00eame \u00e9toile lorsqu’elle \u00e9tait plus jeune et plus petite (de type g\u00e9ante rouge<\/a>) il y a 400\u00a0000\u00a0ans<\/span>. Le front de choc engendre ce que l’on nomme une bulle de Wolf-Rayet<\/a>.<\/p>\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>\nCygne<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n20h<\/sup>\u00a012m<\/sup>\u00a07s<\/sup>1<\/a><\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n+38\u00b0\u00a021,3\u2032 1<\/a><\/sup><\/td>\n<\/tr>\n
Distance<\/th>\n5\u00a0000\u00a0al<\/a><\/span>
\n(1\u00a0533\u00a0pc<\/a><\/span>)<\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V)<\/small><\/th>\n+7.4<\/td>\n<\/tr>\n
Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n
Type d’objet<\/th>\nN\u00e9buleuse en \u00e9mission<\/a><\/td>\n<\/tr>\n
Masse<\/a><\/th>\n–\u00a0M\u2609<\/sub><\/a><\/td>\n<\/tr>\n
Dimensions<\/th>\n25
\n(7.27\u00a0pc<\/a>)<\/td>\n<\/tr>\n
Magnitude absolue<\/a><\/th>\n–<\/td>\n<\/tr>\n
Couleur (B-V)<\/small><\/th>\n–<\/td>\n<\/tr>\n
D\u00e9couverte<\/th>\n<\/tr>\n
D\u00e9couvreur(s)<\/th>\nWilliam Herschel<\/a><\/td>\n<\/tr>\n
Date<\/th>\n1792<\/td>\n<\/tr>\n
D\u00e9signation(s)<\/th>\nNGC<\/a> 68881<\/a><\/sup>, Sh-2<\/a> 105, LBN 203, H IV-72, GC 4561<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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