Cresent Nebula Oct-19

Posted by on Nov 3, 2019

Cresent Nebula Oct-19

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 (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.

Raw images:
Ha: 10 x 10min  (Tot: 100min) Bin:1
OIII: 6 x 10min  (Tot: 60min) Bin:2
SII: 3 x 10min  (Tot: 30min) Bin:2
Seeing: 2.6"

Equipment used:
ASA N12 Astrograph F/3.6
3" Wynne Corrector 0.95x
Moravian G3 16200 camera @-25C
No guiding

Filter:
Astrodon Ha 3nm, OIII 5nm, SII 5nm

Location/Date:
Valla Observatory (FROSON, Sweden) October 4, 2019

Image processing:
Images calibrated and processed in Pixinsight, AstroPix and Photoshop 
Color image with Photoshop
Noise removal with NeatImage

Image palette:
RGB palette. SII - Red, OIII - Blue, Ha - Green
Luminance - Ha+OIII combined 50%

 Image information:
Scale: 1.14 arcsec/pix

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