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Masquerading_as_a_double_star.jpg (568 × 586 Pixel, Dateigröße: 101 KB, MIME-Typ: image/jpeg)
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| BeschreibungMasquerading as a double star.jpg |
English: 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, the two 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 an elongated 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’s central 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. |
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| Quelle | http://www.spacetelescope.org/images/potw1312a/ |
| Urheber | ESA/Hubble & NASA |
| ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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| Version vom | Vorschaubild | Maße | Benutzer | Kommentar | |
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| aktuell | 10:29, 25. Mär. 2013 | 568 × 586 (101 KB) | wikimediacommons>Jmencisom | User created page with UploadWizard |
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| Erfassungszeitpunkt | 10:00, 25. Mär. 2013 |
| Quelle | ESA/Hubble |
| Namensnennung/Veröffentlicher | ESA/Hubble & NASAAcknowledgement: Josh Barrington |
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| Kontaktinformationen |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
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