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The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble, Göran Nilsson
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The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble

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The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble, Göran Nilsson
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The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble

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This image is from the second night that I aimed at the Wolf-Rayet object WR 134. This time with a different framing to include the Crescent nebula, the elusive Soap Bubble (although apparently not elusive for a RASA), and the strong Ha emitting nebula Sh2-104 (near the upper edge of the image). I actually forgot about this Sharpless object so it was cheer luck that it just about ended up within the frame.

As I mentioned in my previous post, WR 134 is a variable Wolf-Rayet star at a distance of about 6000 ly. Its intense wind of radiation pushes out a bubble like structure emitting faint but distinctive Oiii light.

Also the Crescent nebula is a Wolf-Rayet object. It is formed by the fast stellar wind from WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures (all according to Wikipedia).

The Soap Bubble nebula (aka PN G75.5+1.7) is a planetary nebula discovered as late as 2007 by amateur astronomer Dave Jurasevich using a 6" refractor.

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  • The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble, Göran Nilsson
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    The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble, Göran Nilsson
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The Crescent nebula, WR 134, Sh2-104, and the Soap Bubble, Göran Nilsson