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NGC6888 & PN G75.5+1.7  

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.

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.