{"id":9368,"date":"2021-10-09T16:38:48","date_gmt":"2021-10-09T15:38:48","guid":{"rendered":"http:\/\/outters.fr\/?p=9368"},"modified":"2025-07-15T17:04:04","modified_gmt":"2025-07-15T16:04:04","slug":"ngc7789-rgb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=9368","title":{"rendered":"ngc7789 en rgb"},"content":{"rendered":"

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NGC7789 en rgb
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Donn\u00e9es techniques de prise de vue<\/h2><\/div>
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Objects : ngc7789
\nCommon name :
\nDate : du 30 septembre au 9 octobre 2021
\nOptics : Rcos 12.5″
\nMount : Paramount ME Num\u00e9ro 3
\nLocation : Sirene observatory
\nSeeing FWHM :1.97 \u00e0 3.19
\nCcd : Apogee 16U
\nfilter wheel : Apogee
\nfilters : Astrodon RVB
\nFocuser :Rcos
\nGuiding : Atik 314L+
\nTemp. out : T\u00b0 de \u00b0
\nTemp ccd : -235\u00b0<\/p>\n\n\n\n\n\n\n\n\n\n
Center (RA, Dec):<\/td>\n(359.350, 56.708)<\/td>\n<\/tr>\n
Center (RA, hms):<\/td>\n23h<\/sup>\u00a057m<\/sup>\u00a023.963s<\/sup><\/td>\n<\/tr>\n
Center (Dec, dms):<\/td>\n+56\u00b0\u00a042′\u00a029.058″<\/td>\n<\/tr>\n
Size:<\/td>\n44.2 x 44.2 arcmin<\/td>\n<\/tr>\n
Radius:<\/td>\n0.521 deg<\/td>\n<\/tr>\n
Pixel scale:<\/td>\n0.647 arcsec\/pixel<\/td>\n<\/tr>\n
Orientation:<\/td>\nUp is 93.5 degrees E of N<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Total exposure\u00a0 4.75 h
\ntout en binning 1×1
\n41R 34V 42B x 5mn<\/p>\n<\/div><\/div><\/div>

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Image RGB<\/h2><\/a><\/div><\/div><\/div>
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Image RGB annotate<\/h2><\/a><\/div><\/div><\/div>
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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En g\u00e9n\u00e9ral je photographie les amas stellaires uniquement en RGB et en d\u00e9but de soir\u00e9e en attendant un objet\u00a0 qui ne peut d\u00e9marrer qu’en cours de nuit. La r\u00e8gle n’a pas d\u00e9rog\u00e9.<\/p>\n

Un niveau du traitement c’est l’expression la plus simple qui prime, un simple assemblage RGB avec une calibration des couleurs sur Pixinsight, le reste se fait sous Photoshop avec une l\u00e9g\u00e8re saturation des couleurs.<\/p>\n

Voici le positionnement de ce superbe amas dans le ciel pris entre le magnifique Sharpless 157 et le fantomatique r\u00e9manent de supernovae CT1 ou abell 85.<\/p>\n

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Donn\u00e9es techniques
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Source Wikipedia<\/p>\n

NGC 7789<\/b>\u00a0est un\u00a0amas ouvert<\/a>\u00a0dans\u00a0Cassiop\u00e9e<\/a>\u00a0qui a \u00e9t\u00e9 d\u00e9couvert par\u00a0Caroline Herschel<\/a>\u00a0en 1783. Son fr\u00e8re\u00a0William Herschel<\/a>\u00a0l’a inclus dans son catalogue en tant que \u00ab\u00a0H VI.30\u00a0\u00bb. Cet amas est \u00e9galement connu sous le nom de \u00ab\u00a0Rose blanche\u00a0\u00bb ou \u00ab\u00a0Rose de Caroline\u00a0\u00bb car les boucles form\u00e9es par les \u00e9toiles ressemblent au tourbillon form\u00e9 par des p\u00e9tales de rose.<\/p>\n

Cet amas ouvert a un diam\u00e8tre angulaire de 16′1<\/a><\/sup>\u00a0(environ la moiti\u00e9 du diam\u00e8tre de la lune), il est compos\u00e9 d’environ un millier d’\u00e9toile, il est distant de 6\u00a0000\u00a0a.l.<\/a>\u00a0et mesure 50\u00a0a.l.<\/a>\u00a0de diam\u00e8tre.<\/p>\n<\/div><\/div><\/div>

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