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NGC6888 With The Soap Bubble
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| Classification: |
Emission nebula, NGC 6888, Caldwell 27, Sh2-105 |
| Constellation: |
Cygnus (CYG) |
| Object Location: |
Ra 20h 12m 40s Dec +38° 24’24° (current) |
| Size & Distance: |
18 x 12 Apx, 5000 light years. |
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| Date & Location: |
07-24/25-2025 Lockwood Observatory, Descanso,CA. |
| Exposure: |
HOO 180-420 Ha=12x15, O3=28x15 (bin1x1) |
| Optics: |
AP 110GTX f/5 550mm, AP-TCC |
| Mount: |
Astro-Physics Mach 1 GTOCP4 / ATS 8x36 Pier. |
| Camera: |
Moravian C3-26000ECPro / EFW-3M-7-ll/ Guided by ZWO 174mini / w OAG. |
| Filters: |
Chroma 50mm 3nm Ha-O3 |
| Software: |
MaxImDL 6.11, CCDStack, Photoshop CC, PI. |
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| Notes: |
Sky conditions: Above average seeing, calm winds, SQM was 21.23, Temp low 50’s
Cropped Image Field of view is 90.5 x 90.5 arcmin. Image Scale 1.41
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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away. It was discovered by Friedrich Wilhelm Herschel in 1792. .It is formed by the fast stellar wind from the Wolf-Rayet star 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.
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