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PHOTOGRAPHY BY
Margaret Watson LRPS AFIAP
 

Astro Gallery, Nebulae, NGC6888 Crescent Nebula
NGC6888 Crescent NebulaMouseover image to see plate solved annotations, click image to see it at a larger size.

NGC6888 Crescent Nebula


The Crescent Nebula, catalogued as NGC 6888, Caldwell 27, and 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 250,000 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.


Reference:1009Date taken:August 2012
Location:Galera, Andalucia, SpainImaging telescope:Takahashi FSQ85 450mm @ f5.3
Imaging camera:Atik 383L+Camera setpoint:-10C
Mount:Takahashi EM200 Temma 2MGuiding telescope:ST-80
Guiding camera:SSAGFilters:Baader Ha, OIII
Light frames:Ha=24 x 600s, OIII=18 x 600sIntegration:7 hours
Dark frames:35Flat frames:35 each channel
Bias frames:35Capture software:Artemis Capture
Guiding software:MaximDLProcessing software:Pixinsight, Photoshop CS5, Noel Carboni's Actions, Nik Tools
Accessories:Lakeside focuser 
 
Processing notes:The image was processed with the bicolour HOO palette assigning Red to Ha, Green and Blue to OIII.

Center (RA, Dec): (302.974, 38.692)
Center (RA, hms): 20h 11m 53.688s
Center (Dec, dms): +38 41' 32.040"
Size: 1.75 x 1.31 deg
Radius: 1.092 deg
Orientation: Up is -135 degrees E of N
 
 
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