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Posts: 131433
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Caldwell 11
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The Bubble Nebula in 4K (NGC 7635)

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NGC 7635
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NGC 7635 (also called the Bubble Nebula, Sharpless 162, or Caldwell 11) is a H II region emission nebula in the constellation Cassiopeia.

The planetary nebula was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Windsor Road in Slough, Berkshire, on the 3rd November 1787. 

Right Ascension 23h 20m 48.3s, Declination +61° 12' 06"

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The nebula is observable with an 8 or 10-inch (250 mm) telescope close to the open cluster M52; at low magnifications it appears in the same field of vision. A nearby 7th magnitude star will help locate the nebula. The appearance is that of an arc or bubble surrounded by a faint nebula. Also visible is the central magnitude 8.7 young Wolf-Rayet star. The nebula was first identified as a Planetary Nebulae due to its circular shape; but it is now established that it is instead an emission nebula. 



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Bubble Nebula
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WIYN/NOAO: The Bubble Nebula, observed with the new One Degree Imager Camera

Just in time for the holidays, a spectacular image of the Bubble Nebula (NGC 7635) demonstrates the potential of the new camera known as the One Degree Imager, or ODI, that is being commissioned at the WIYN 3.5-meter telescope on Kitt Peak. The Bubble Nebula is a shell of gas and dust carved out by the stellar wind of the massive central star (BD+60 2522), and ionised by the same star's high-energy light. Located in the constellation Cassiopeia, this nebula is about 10 light-years across.
The accompanying wide field of the Bubble Nebula covers an area of the sky of 25 by 25 arc minutes, just a little smaller than the full moon. The exquisite resolution, or sharpness, of the stars right to the edge of the image is a hint of things to come.

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NGC7635
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NGC 7635, the Bubble Nebula, lies 11,000 light-years away toward the constellation Cassiopeia..
The 10 light-year diameter bubble is created by a bright hot star embedded in reflecting dust. A fierce stellar wind and intense radiation from the star, which likely has a mass 10 to 20 times that of the Sun, has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud.


Expand (214kb, 1024 x 673)
Credit Eric Mouquet

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