{"id":8218,"date":"2019-04-05T21:28:42","date_gmt":"2019-04-05T20:28:42","guid":{"rendered":"http:\/\/outters.fr\/?p=8218"},"modified":"2025-07-15T17:04:08","modified_gmt":"2025-07-15T16:04:08","slug":"ic443_ho_rgb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=8218","title":{"rendered":"ic443_HOO_rgb"},"content":{"rendered":"

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ic443_HOO_rgb
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Image HOO-RGB<\/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 :ic443
\nCommon name : n\u00e9buleuse de la m\u00e9duse
\nDate : du 13 f\u00e9vrier\u00a0 au 31 mars-2019
\nOptics : Newton SV400 F3,8
\nCCD : FLI Proline 16803
\nGuider : Atik 414L+
\nFiltres : Astrodon Ha-OIII-RGB
\nResolution …….. 1.154 arcsec\/px
\nRotation ………. 1.031 deg
\nFocal …………. 1608.88 mm
\nPixel size …….. 9.00 um
\nField of view ….. 1d 18′ 46.1″ x 1d 18′ 46.1″
\nImage center …… RA: 06 17 32.638 Dec: +22 28 02.58
\nTotal time :18h40
\n6 x 5′ en B
\n24 x 5′ en V
\n42 x 5′ en R
\nHa\u00a033 x 10m
\nOIII\u00a042 x 10m<\/div><\/div><\/div>
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Donn\u00e9es scientifiques<\/h2><\/div>
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IC 443<\/b>, ou SNR G189.0+03.0<\/b>, est un r\u00e9manent de supernova<\/a> situ\u00e9 dans la constellation des G\u00e9meaux<\/a>. De taille angulaire<\/a> importante (45 minutes d’arc, soit une fois et demi le diam\u00e8tre apparent<\/a> de la Lune<\/a>), et assez lumineux tant en X<\/a> qu’en radio<\/a>, il fait partie des r\u00e9manents de supernova les plus \u00e9tudi\u00e9s, une des raisons \u00e9tant qu’il repr\u00e9sente un prototype de r\u00e9manent interagissant avec le milieu interstellaire<\/a> environnant. Pour autant tant la distance que l’\u00e2ge exact du r\u00e9manent ne sont pas connus. L’\u00e9tude de l’expansion du r\u00e9manent en optique<\/a> plaide pour une distance mod\u00e9r\u00e9e (entre 0,7<\/span> et 1,5<\/span>\u00a0 kpc<\/a><\/span><\/span>), mais son association probable avec la structure appel\u00e9e S249<\/a> sugg\u00e8re une distance plus grande (1,5<\/span> \u00e0 2,0<\/span>\u00a0kpc<\/span><\/span>).<\/p>\n

Dans un instrument d’astronomie amateur<\/a>, IC 443 appara\u00eet comme une grande et faible n\u00e9buleuse en \u00e9mission, accompagn\u00e9e par quelques \u00e9toiles jeunes. Il faut l’observer au 200\u00a0mm<\/abbr> de pr\u00e9f\u00e9rence avec un filtre Type OIII et des GR faibles \u00e0 moyen selon la transparence atmosph\u00e9rique. Sa structure laisse entrevoir deux lobes asym\u00e9triques faiblement reli\u00e9s l’un a l’autre, le plus lumineux \u00e9tant l\u00e9g\u00e8rement plus compact. Cette apparence \u00e9voque la forme d’une m\u00e9duse<\/a>, d’o\u00f9 le nom traditionnel (peu usit\u00e9) de N\u00e9buleuse de la M\u00e9duse<\/b>.<\/p>\n

Elle se trouve sur le bord de la constellation, pr\u00e8s de la limite avec Orion\/Taureau, et dans la voie lact\u00e9e pr\u00e8s de l’\u00e9toile \u03b7\u00a0Geminorum<\/a> (Tejat Prior), de magnitude apparente<\/a> 3,3.<\/p>\n

Des lyc\u00e9ens, en exploitant des donn\u00e9es de Chandra<\/a>, ont d\u00e9couvert une\u00a0\u00e9toile \u00e0 neutrons\u00a0dans les restes de la supernova\u00a0IC 443.<\/p>\n<\/div><\/div><\/div>

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