跳转到内容

File:M27 - Dumbbell Nebula.jpg

页面内容不支持其他语言。
這個文件來自維基共享資源
维基百科,自由的百科全书

原始文件 (2,044 × 2,042像素,文件大小:1.74 MB,MIME类型:image/jpeg


描述
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
.
日期
来源 http://www.eso.org/public/images/eso9846a/
作者 ESO
授权
(二次使用本文件)
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:zh:知识共享
署名
本文件采用知识共享署名 4.0 国际许可协议授权。
您可以自由地:
  • 共享 – 复制、发行并传播本作品
  • 修改 – 改编作品
惟须遵守下列条件:
  • 署名 – 您必须对作品进行署名,提供授权条款的链接,并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名,但不得以任何方式表明许可人认可您或您的使用。

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描繪內容

image/jpeg

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2022年8月25日 (四) 18:142022年8月25日 (四) 18:14版本的缩略图2,044 × 2,042(1.74 MB)Fabian RRRRfrom the actual source
2010年3月2日 (二) 08:342010年3月2日 (二) 08:34版本的缩略图4,961 × 5,004(3.04 MB)TryphonHigher resolution, from http://www.eso.org/public/archives/images/large/eso9846a.jpg.
2008年9月18日 (四) 09:022008年9月18日 (四) 09:02版本的缩略图3,966 × 4,000(849 KB)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

以下2个页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

查看此文件的更多全域用途

元数据