Aller au contenu

Fichier:M27 - Dumbbell Nebula.jpg

Le contenu de la page n’est pas pris en charge dans d’autres langues.
Un livre de Wikilivres.

Fichier d’origine (2 044 × 2 042 pixels, taille du fichier : 1,74 Mio, type MIME : image/jpeg)

Description
English: The Dumbbell Nebula

The Dumbbell Nebula ­— also known as Messier 27 or NGC 6853 — is a typical planetary nebula and is located in the constellation Vulpecula (The Fox). The distance is rather uncertain, but is believed to be around 1,200 light-years. It was first described by the French astronomer and comet hunter Charles Messier who found it in 1764 and included it as no. 27 in his famous list of extended sky objects [2] .Despite its class, the Dumbbell Nebula has nothing to do with planets. It consists of very rarified gas that has been ejected from the hot central star (well visible on this photo), now in one of the last evolutionary stages. The gas atoms in the nebula are excited (heated) by the intense ultraviolet radiation from this star and emit strongly at specific wavelengths.

This image is the beautiful by-product of a technical test of some FORS1 narrow-band optical interference filtres. They only allow light in a small wavelength range to pass and are used to isolate emissions from particular atoms and ions. In this three-colour composite, a short exposure was first made through a wide-band filtre registering blue light from the nebula. It was then combined with exposures through two interference filtres in the light of double-ionized oxygen atoms and atomic hydrogen. They were colour-coded as “blue”, “green” and “red”, respectively, and then combined to produce this picture that shows the structure of the nebula in “approximately true” colours.

They are three-colour composite based on two interference ([OIII] at 501 nm and 6 nm FWHM — 5 min exposure time; H-alpha at 656 nm and 6 nm FWHM — 5 min) and one broadband (Bessell B at 429 nm and 88 nm FWHM; 30 sec) filtre images, obtained on September 28, 1998, during mediocre seeing conditions (0.8 arcsec). The CCD camera has 2048 x 2048 pixels, each covering 24 x 24 µm and the sky fields shown measure 6.8 x 6.8 arcminutes and 3.5 x 3.9 arcminutes, respectively. North is up; East is left.

Credit:

ESO/I. Appenzeller, W. Seifert, O. Stahl, M. Zamani

Coordinates
Position (RA):  	19 59 36.41
Position (Dec): 	22° 43' 16.00"
Field of view:  	6.76 x 6.82 arcminutes
Orientation:    	North is 0.0° left of vertical
Colours & filters
Band            	Wavelength	Telescope
Optical u       	361 nm   	Very Large Telescope FORS1
Optical B       	429 nm   	Very Large Telescope FORS1
Optical Oiii    	501 nm   	Very Large Telescope FORS1
Optical HeII    	472 nm   	Very Large Telescope FORS1
Optical R       	655 nm   	Very Large Telescope FORS1
Optical H-alpha 	656 nm   g	Very Large Telescope FORS1
.
Date
Source http://www.eso.org/public/images/eso9846a/
Auteur ESO
Autorisation
(Réutilisation de ce fichier)
This media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible."
To the uploader: You must provide a link (URL) to the original file and the authorship information if available.
w:fr:Creative Commons
paternité
Ce fichier est disponible selon les termes de la licence Creative Commons Attribution 4.0 International.
Vous êtes libre :
  • de partager – de copier, distribuer et transmettre cette œuvre
  • d’adapter – de modifier cette œuvre
Sous les conditions suivantes :
  • paternité – Vous devez donner les informations appropriées concernant l'auteur, fournir un lien vers la licence et indiquer si des modifications ont été faites. Vous pouvez faire cela par tout moyen raisonnable, mais en aucune façon suggérant que l’auteur vous soutient ou approuve l’utilisation que vous en faites.

Légendes

Ajoutez en une ligne la description de ce que représente ce fichier

Éléments décrits dans ce fichier

dépeint

image/jpeg

Historique du fichier

Cliquer sur une date et heure pour voir le fichier tel qu'il était à ce moment-là.

Date et heureVignetteDimensionsUtilisateurCommentaire
actuel25 août 2022 à 19:14Vignette pour la version du 25 août 2022 à 19:142 044 × 2 042 (1,74 Mio)Fabian RRRRfrom the actual source
2 mars 2010 à 09:34Vignette pour la version du 2 mars 2010 à 09:344 961 × 5 004 (3,04 Mio)TryphonHigher resolution, from http://www.eso.org/public/archives/images/large/eso9846a.jpg.
18 septembre 2008 à 10:02Vignette pour la version du 18 septembre 2008 à 10:023 966 × 4 000 (849 kio)Lars Lindberg Christensen{{Information |Description={{en|1=The Dumbbell Nebula - also known as Messier 27 or NGC 6853 - is a typical planetary nebula and is located in the constellation Vulpecula (The Fox). The distance is rather uncertain, but is believed to be around 1200 light

La page suivante utilise ce fichier :

Usage global du fichier

Les autres wikis suivants utilisent ce fichier :

Voir davantage sur l’utilisation globale de ce fichier.

Métadonnées