File:Masquerading as a double star.jpg

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	日期/時間	縮⁠圖	尺寸	使用者	備⁠註
目前	2013年3月25日 (一) 18:29		568 × 586（101 KB）	zhwiki>Jmencisom	User created page with UploadWizard

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來源	ESA/Hubble
製作/提供者	ESA/Hubble & NASAAcknowledgement: Josh Barrington
影像標題	The object in this image is Jonckheere 900 or J 900, a planetary nebula— glowing shells of ionised gas pushed out by a dying star. Discovered in the early 1900s by astronomer Robert Jonckheere, the dusty nebula is small but fairly bright, with a relatively evenly spread central region surrounded by soft wispy edges. Despite the clarity of this Hubble image, thetwo objects in the picture above can be confusing for observers. J 900’s nearby companion, a faint star in the constellation of Gemini, often causes problems for observers because it is so close to the nebula — when seeing conditions are bad, this star seems to merge into J 900, giving it anelongated appearance. Hubble’s position above the Earth’s atmosphere means that this is not an issue for the space telescope. Astronomers have also mistakenly reported observations of a double star in place of these two objects, as the planetary nebula is quite small and compact. J 900’scentral star is only just visible in this image, and is very faint — fainter than the nebula’s neighbour. The nebula appears to display a bipolar structure, where there are two distinct lobes of material emanating from its centre, enclosed by a bright oval disc. A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Josh Barrington.
簡稱	Masquerading as a double star
使用條款	Creative Commons Attribution 3.0 Unported license
資料產生的日期時間	2013年3月25日 (一) 10:00
關鍵字	Jonckheere 900 PN G194.2+02.5
聯絡資訊	http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei M√ºnchen, , D-85748 Germany