The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) (urmymuse)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888 · Sh2-105

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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

This image represents two big steps for me

i. Have had my Canon 7D astro modified by Andy Ellis at www.astronomiser.co.uk -fantastic result what a difference - finally can bring out the red

. Should have done this much sooner

ii. Finally got a routine to properly collimate my Orion Astrograph thanks to buying some Bobs Knobs and combining the advice of Astro-Baby @ http://www.astro-baby.com/astrobaby/help/collimation-guide-newtonian-reflector/ plus using web cam to view what going on ... got this idea from the astronomyshed you tube channel

Astro-baby in particular helpful in explaining how things should look in the end for a well collimated fast Newtonian

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 from Earth. It was discovered by William 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.

N.I.N.A. Users
Yorkshire Astro Imaging

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Status	Advanced success
Started	...
Astrometry.net job	3252589
PixInsight job	MIP43ZT09ATQQN7LFH80XMACQ48SR87S
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m05s.303
RA (top/left)	20h10m31s.879
RA (top/right)	20h13m27s.580
RA (bottom/right)	20h13m39s.304
RA (bottom/left)	20h10m42s.494

Dec (center)	+38°20′20″.77
Dec (top/left)	+38°08′15″.90
Dec (top/right)	+38°05′26″.80
Dec (bottom/right)	+38°32′23″.10
Dec (bottom/left)	+38°35′12″.17

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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105)

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