{"id":1664,"date":"2021-01-05T23:31:03","date_gmt":"2021-01-06T04:31:03","guid":{"rendered":"https:\/\/ciel-astro-ccd.com\/wp\/?page_id=1664"},"modified":"2024-05-05T09:32:50","modified_gmt":"2024-05-05T13:32:50","slug":"m1","status":"publish","type":"page","link":"https:\/\/ciel-astro-ccd.com\/wp\/m1\/","title":{"rendered":"M 1"},"content":{"rendered":"\n
\"\"\/<\/a>
Cliquer sur l\u2019image pour l\u2019afficher plein \u00e9cran<\/em><\/figcaption><\/figure>\n\n\n\n
Date<\/strong>
2018\/12\/15

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>Planewave 431 mm – 17″, 1940 mm FL, f\/4,5 avec r\u00e9ducteur de focale<\/td><\/tr>
Monture<\/td>Planewave Ascension 200HR (FLI)<\/td><\/tr>
Cam\u00e9ra d\u2019imagerie<\/td>Microline PL6303E (FLI) \u2013 r\u00e9gul\u00e9 \u00e0 -25o<\/sup> Celsius<\/td><\/tr>
Type d\u2019image<\/td>Ha(RVsB) (Vs pour vert syngh\u00e9tique<\/em>)<\/td><\/tr>
Exposition<\/td>Ha (10 x 10\u2019 bin 1×1), R et B (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 d\u00e9nomm\u00e9e \u00ab La n\u00e9buleuse du Crabe \u00bb<\/td><\/tr>
Constellation<\/td>Taureau<\/td><\/tr>
Magnitude visuelle<\/td>8,4<\/td><\/tr>
Distance<\/td>6200 d\u2019ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Diam\u00e8tre<\/td>13 ann\u00e9es-lumi\u00e8re<\/td><\/tr>
Dimension vue de la Terre<\/td>6 x 4 minutes d\u2019arc <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
En lumi\u00e8re visible, la n\u00e9buleuse du Crabe est une large masse ovale de filaments, d’une longueur d’environ 6 minutes d’arc et d’une largeur de 4 minutes d’arc entourant une r\u00e9gion centrale diffuse bleue. L’analyse r\u00e9cente a montr\u00e9 que l\u2019\u00e9toile qui a explos\u00e9 en supernova et qui est \u00e0 l’origine de la n\u00e9buleuse du Crabe est apparue probablement en avril ou d\u00e9but mai 1054, atteignant une magnitude apparente maximale comprise entre -5 et -3 en juillet 1054. Elle \u00e9tait alors plus lumineuse que tous les autres objets du ciel nocturne \u00e0 l’exception de la Lune.  

Les filaments sont les restes de l’atmosph\u00e8re de la supernova et sont constitu\u00e9s principalement d’h\u00e9lium et d’hydrog\u00e8ne ionis\u00e9s ainsi que de carbone, d’oxyg\u00e8ne, d’azote, de fer, de n\u00e9on et de soufre. Au centre m\u00eame de la n\u00e9buleuse se trouve un pulsar : une \u00e9toile \u00e0 neutrons aussi massive que le Soleil. Le pulsar du Crabe tourne sur lui-m\u00eame environ 30 fois par seconde.  
M1 est une n\u00e9buleuse tr\u00e8s pris\u00e9e des astronomes amateurs : avec sa magnitude de 8,4 et sa taille de 6 X 4 minutes d’arc, c’est une cible de choix aussi bien pour l’observation visuelle qu’en astrophotographie.

L\u2019observation visuelle doit s\u2019effectuer dans un ciel de faible pollution lumineuse. La n\u00e9buleuse est alors visible comme une faible tache avec des jumelles 7×50 ou 10×50. Dans des t\u00e9lescopes de 10 cm (4 pouces) et plus d’ouverture, quelques d\u00e9tails dans sa forme deviennent apparents. Ce n’est que dans d’excellentes conditions d’observation et avec des t\u00e9lescopes de 40 cm (16 pouces) ou plus d’ouverture, que l’on peut \u00e9ventuellement entrevoir les filaments et les fines structures.     

Dans mon image, on peut voir les tr\u00e8s beaux filaments de couleur rouge qui entourent la r\u00e9gion centrale bleue de la n\u00e9buleuse. Pour faire ressortir au maximum ces filaments, j\u2019ai utilis\u00e9 un filtre en Hydrog\u00e8ne alpha (Ha) comme image de luminance. Pour l\u2019image couleur, j\u2019ai choisi les filtres RVsB (rouge et bleu avec un vert synth\u00e9tique produit avec les images rouge et bleue) dans le but de faire ressortir les tr\u00e8s belles couleurs naturelles de la n\u00e9buleuse.  <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Richard Beauregard
Le Ciel Astro – CCD
Mon impression \u00ab\u00a0Nous ne pouvons pas \u00eatre seuls dans ce gigantesque univers\u00a0\u00bb<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

Date2018\/12\/15 Lieu d\u2019observationNouveau-Mexique Technique T\u00e9lescope Planewave 431 mm – 17″, 1940 mm FL, f\/4,5 avec r\u00e9ducteur de focale Monture Planewave Ascension 200HR (FLI) Cam\u00e9ra d\u2019imagerie Microline PL6303E (FLI) \u2013 r\u00e9gul\u00e9 \u00e0 -25o Celsius Type d\u2019image Ha(RVsB) (Vs pour vert syngh\u00e9tique) Exposition Ha (10 x 10\u2019 bin 1×1), R et B (4 x 3\u2019 bin 2×2 chacune)…<\/p>\n

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