{"id":2466,"date":"2021-01-10T15:29:48","date_gmt":"2021-01-10T20:29:48","guid":{"rendered":"https:\/\/ciel-astro-ccd.com\/wp\/?page_id=2466"},"modified":"2023-05-06T23:44:48","modified_gmt":"2023-05-07T03:44:48","slug":"ic1805","status":"publish","type":"page","link":"https:\/\/ciel-astro-ccd.com\/wp\/ic1805\/","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>
2013\/01\/16

Lieu d\u2019observation<\/strong>
Nouveau-Mexique<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Technique<\/strong><\/h4>\n\n\n\n
T\u00e9lescope<\/td>Takahashi FSQ 106ED – Diam. 106 mm (4,2″), foca. 530 mm, f\/5 <\/td><\/tr>
Monture<\/td>Paramount ME<\/td><\/tr>
Cam\u00e9ra d\u2019imagerie<\/td>SBIG STL 11000 r\u00e9gul\u00e9e \u00e0 -15o<\/sup> Celsius<\/td><\/tr>
Type d\u2019image<\/td>Ha(RVsB) (Vs pour vert syngh\u00e9tique<\/em>)<\/td><\/tr>
Exposition<\/td>Ha (11 x 10\u2019 bin 1×1), RB (4 x 3\u2019 bin 2×2 chacune)<\/td><\/tr>
Pr\u00e9traitement<\/td>Maxim DL<\/a><\/td><\/tr>
Traitement<\/td>Photoshop et PixInsight<\/a><\/td><\/tr>
Traitement sp\u00e9cifique<\/td>Cr\u00e9er une image verte synth\u00e9tique<\/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>Environ 190\u2019 x 155\u2019 d’arc, donn\u00e9e officiel 60\u2019 x 60\u2019 d’arc<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
On distingue tr\u00e8s bien sur l\u2019image le fameux c\u0153ur que le surnom de la n\u00e9buleuse \u00e9voque. Cette grande n\u00e9buleuse, de faible brillance, est compos\u00e9 de gaz d\u2019hydrog\u00e8ne ionis\u00e9e par le rayonnement ultraviolet des jeunes \u00e9toiles chaudes. Elle contient, en son centre, l\u2019amas ouvert dense IC1805. La n\u00e9buleuse, surnomm\u00e9 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 officiel, 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. On voit, en bas vers la droite, la n\u00e9buleuse IC1795 (NGC896) que j\u2019ai photographi\u00e9 le 9 octobre 2012. On voit aussi l\u2019amas ouvert NGC 1027 en haut au centre, l\u00e9g\u00e8rement vers la droite. On peut aussi voir l\u2019amas ouvert MK6 \u00e0 la gauche de la n\u00e9buleuse, l\u00e9g\u00e8rement vers le bas. \u00c0 l\u2019extr\u00eame gauche, \u00e0 l\u2019ext\u00e9rieur de la n\u00e9buleuse et l\u00e9g\u00e8rement vers le haut, on peut voir l\u2019amas ouvert K4. Il y a aussi d\u2019autres objets \u00e0 l\u2019int\u00e9rieur de la n\u00e9buleuse du c\u0153ur.  

Contrairement \u00e0 l\u2019amas ouvert brillante 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 peut visible et sera obstru\u00e9e par l\u2019importante quantit\u00e9 d\u2019\u00e9toiles qui la compose.<\/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":"

Date2013\/01\/16 Lieu d\u2019observationNouveau-Mexique Technique T\u00e9lescope Takahashi FSQ 106ED – Diam. 106 mm (4,2″), foca. 530 mm, f\/5  Monture Paramount ME Cam\u00e9ra d\u2019imagerie SBIG STL 11000 r\u00e9gul\u00e9e \u00e0 -15o Celsius Type d\u2019image Ha(RVsB) (Vs pour vert syngh\u00e9tique) Exposition Ha (11 x 10\u2019 bin 1×1), RB (4 x 3\u2019 bin 2×2 chacune) Pr\u00e9traitement Maxim DL Traitement Photoshop et…<\/p>\n

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