NGC 6543 (Julien.Looten)

NGC 6543

Link: https://www.flickr.com/photos/julienlooten/51173588342/in/datetaken-public/

NGC 6543

Link: https://www.flickr.com/photos/julienlooten/51173588342/in/datetaken-public/

La nébuleuse planétaire de l’oeil de Chat - NGC 6543

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Le terme de « planétaire » est proposé la première fois par William Herschel en 1785, en raison de la ressemblance visuelle entre ces nébuleuses et la planète qu'il venait de découvrir, à savoir Uranus… Ce terme est maintenu pour conserver l’uniformité historique. En réalité, ces nébuleuses n’ont aucun lien avec les planètes.

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Certaines étoiles arrivant en fin de vie se transforment en « géantes rouges » - Elles grossissent, leur température décroît et des gazs sont éjectés pour former une nébuleuse. C’est ce processus stellaire qui est à l’origine de la nébuleuse de l’œil de Chat. D’ailleurs, cette nébuleuse planétaire est la plus brillante visible depuis la Terre.

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Son âge est estimé à un millier d’années. La nébuleuse continue à s’étendre au fil du temps à la vitesse de 10 km/s (oui, par seconde….).

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C’est l’objet le plus « petit » et compliqué que j’ai eu à photographier… 6 heures d’exposition ont été nécessaires pour obtenir ces détails et couleurs. J’ai réalisé un HDR (deux expositions différentes) pour que le coeur (extrêmement lumineux) ne soit pas cramé…

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Même si cette petite nébuleuse est moins impressionnante que celle d’Orion, elle n’en reste pas moins belle.. je vous conseille d’aller voir la photographie que le télescope spatial Hubble a faite de cet objet céleste… c’est tout simplement incroyable. « NGC 6543 Hubble » sur internet.

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Skywatcher 200/1000 sur Neq6 pro goto

Canon Eos 6d astrodon

200 x 90s et 100x10s

Traitement Siril et ps

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Merci d’avance!

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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