Nebulae

NGC 6888 THE CRESCENT NEBULA NARROWBAND

(CLICK REFRESH ON YOUR BROWSER IF IT DOESN'T APPEAR)

Equipment and exposition:

Skywatcher ED80 reduced with William Optics 0.8x Type II
ATIK 314L with Atik Filter USB wheel,Astronomik Filters 31,8
Guided with Orion ST 80 with Starshoot Autoguider
NEQ6 Geoptik Modded
About 4 hours (HA-OIII-SII)
Site: Savi, Italy

Awards:

AAPOD 15/08/2010

NUOVO ORIONE NOVEMBRE 2010

About this object:

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 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 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.

Bibliography :  NASA/Wikipedia




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