{"id":2104,"date":"2021-01-06T22:24:34","date_gmt":"2021-01-07T03:24:34","guid":{"rendered":"https:\/\/ciel-astro-ccd.com\/wp\/?page_id=2104"},"modified":"2023-08-21T15:25:52","modified_gmt":"2023-08-21T19:25:52","slug":"ic1805_pol","status":"publish","type":"page","link":"https:\/\/ciel-astro-ccd.com\/wp\/ic1805_pol\/","title":{"rendered":"IC 1805"},"content":{"rendered":"\n
\"\"\/<\/a>
Cliquer sur l’image pour l’afficher plein \u00e9cran<\/em><\/figcaption><\/figure>\n\n\n\n
Date<\/strong>
2018\/08\/16

Lieu d\u2019observation<\/strong>
Mon observatoir permanent \u00e0 Longueuil
en zone de pollution lumineuse blanche<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Technique<\/strong><\/h4>\n\n\n\n
T\u00e9lescope<\/td>Lunette Orion 80ED \u2013 Diam\u00e8tre 80 mm, focale 480 mm, f\/6<\/td><\/tr>
Monture<\/td>Celestron CGEM<\/td><\/tr>
Cam\u00e9ra d\u2019imagerie<\/td>Atik 383 L+ monochrome r\u00e9gul\u00e9e \u00e0 -20o<\/sup> Celsius<\/td><\/tr>
Cam\u00e9ra d\u2019autoguidage<\/td>ZWO ASI 120MM avec un diviseur optique<\/td><\/tr>
Pr\u00e9cision d\u2019autoguidage (RMS)<\/td>0,91\u2019\u2019 d\u2019arc RMS (1,82\u2019\u2019 d\u2019arc au total)<\/td><\/tr>
Type d\u2019image<\/td>Ha(Ha-OIII-OIII)<\/td><\/tr>
Exposition<\/td>Ha (10 x 10\u2019 bin 2×2), OIII (10 x 10\u2019 Bin 2×2)<\/td><\/tr>
Logiciel d\u2019acquisition des images<\/td>Maxim DL<\/td><\/tr>
Logiciel de guidage<\/td>PHD Guiding 2<\/td><\/tr>
Pr\u00e9traitement<\/td>Maxim DL<\/a><\/td><\/tr>
Traitement<\/td>Photoshop et PixInsight<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Descripton de l\u2019objet<\/strong><\/h4>\n\n\n\n
Type d\u2019objet<\/td>N\u00e9buleuse \u00e0 \u00e9mission et amas ouvert \u00ab La n\u00e9buleuse du Coeur \u00bb<\/td><\/tr>
Constellation<\/td>Cassiop\u00e9e<\/td><\/tr>
Magnitude visuelle<\/td>6,5<\/td><\/tr>
Distance<\/td>7500 ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Dimension vue de la Terre<\/td>190 x 155 minutes d\u2019arc <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
La grande n\u00e9buleuse du C\u0153ur, de faible brillance, est compos\u00e9e de gaz d\u2019hydrog\u00e8ne ionis\u00e9 par le rayonnement ultraviolet des jeunes \u00e9toiles chaudes. Elle contient, en son centre, l\u2019amas ouvert dense IC1805. La n\u00e9buleuse, surnomm\u00e9e la n\u00e9buleuse du C\u0153ur, est beaucoup plus grande que l\u2019amas ouvert, ce qui porte \u00e0 confusion. En effet, la n\u00e9buleuse du C\u0153ur \u00e0 une dimension d\u2019environ 190\u2019 par 155\u2019, alors que l\u2019amas ouvert (que l\u2019on d\u00e9signe la n\u00e9buleuse du c\u0153ur) couvre 60\u2019 par 60\u2019. Avant de photographier cette n\u00e9buleuse, il est imp\u00e9ratif de tenir compte de ce fait, car, si on se fie \u00e0 la dimension officielle, on prendra une seule petite portion de la n\u00e9buleuse du Coeur.  

La n\u00e9buleuse du C\u0153ur englobe plusieurs objets r\u00e9pertori\u00e9s dans les catalogues astronomiques. En plus de l\u2019amas ouvert dense IC1805, on voit, en bas vers la droite, la n\u00e9buleuse IC1795 (NGC896) que j\u2019ai photographi\u00e9e le 9 octobre 2012 dans un site sans pollution lumineuse. On peut aussi voir l\u2019amas ouvert MK6 \u00e0 la gauche de la n\u00e9buleuse, l\u00e9g\u00e8rement vers le bas. Il y a aussi d\u2019autres objets \u00e0 l\u2019int\u00e9rieur de la n\u00e9buleuse du C\u0153ur.  

Contrairement \u00e0 l\u2019amas ouvert brillant IC1805 de magnitude 6,5, la n\u00e9buleuse l\u2019est beaucoup moins de sorte qu\u2019elle est tr\u00e8s peu visible dans un t\u00e9lescope, m\u00eame de grande dimension.  

Pour bien voir la n\u00e9buleuse du C\u0153ur sur une photographie longue pose, il est imp\u00e9ratif d\u2019utiliser une image de luminance en H-Alpha qui fera ressortir les gaz d\u2019hydrog\u00e8ne qui composent la majeure partie du rayonnement de cette n\u00e9buleuse. Sans l\u2019utilisation de ce filtre, la n\u00e9buleuse restera peu visible et sera obstru\u00e9e par l\u2019importante quantit\u00e9 d\u2019\u00e9toiles qui la compose. Ce filtre H-Alpha a aussi comme particularit\u00e9 de combattre efficacement la pollution lumineuse. Dans mon image, il est tout de m\u00eame \u00e9tonnant d\u2019avoir r\u00e9ussi \u00e0 aller chercher autant de d\u00e9tails et profondeur de la n\u00e9buleuse dans mon site de pollution lumineuse extr\u00eame (Longueuil en banlieue de Montr\u00e9al, Qu\u00e9bec, Canada qui est une zone de pollution lumineuse blanche).  <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Richard Beauregard
Le Ciel Astro \u2013 CCD
Mon impression \u00ab Nous ne pouvons pas \u00eatre seuls dans ce gigantesque univers \u00bb<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

Date2018\/08\/16 Lieu d\u2019observationMon observatoir permanent \u00e0 Longueuilen zone de pollution lumineuse blanche Technique T\u00e9lescope Lunette Orion 80ED \u2013 Diam\u00e8tre 80 mm, focale 480 mm, f\/6 Monture Celestron CGEM Cam\u00e9ra d\u2019imagerie Atik 383 L+ monochrome r\u00e9gul\u00e9e \u00e0 -20o Celsius Cam\u00e9ra d\u2019autoguidage ZWO ASI 120MM avec un diviseur optique Pr\u00e9cision d\u2019autoguidage (RMS) 0,91\u2019\u2019 d\u2019arc RMS (1,82\u2019\u2019 d\u2019arc au…<\/p>\n

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