| Classification: |
Emission nebula / NGC6888 / C27 / LBN203 / Sh2-105 |
| Constellation: |
Cygnus (CYG) |
| Object Location: |
Ra 20h 12m 38s Dec +38° 24’21” (current) |
| Size & Distance: |
18 x 12 Apx. 5000 Light-years. |
|
| Date & Location: |
05-18-2009 Joshua Tree National Park, CA. |
| Exposure: |
Ha 6 @ 20min. (bin 1x1) |
| Optics: |
Takahashi Epsilon-180 f2.8 504mm. |
| Mount: |
Astro-Physics 900 GTO / ATS 10x36 pier. |
| Camera: |
SBIG-ST10XME / Guided by STV 80mm, SBIG-RGH |
| Filters: |
Astrodon 3nm Ha |
| Software: |
MaxImDL 4.56, Photoshop CS |
|
| Notes: |
Sky conditions: Good seeing, Light wind, Temp 68°
Image Field of view is 68 x 101 arc-min.
Planetary Nebula, PN G75.5+1.7 Soap Bubble Nebula, is boxed lower center.
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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 The result of the collision is a shell and two shock waves, one moving outward and one moving inward.
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