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NGC-6888 Crescent Nebula

astrophotography ccd refractor


Jeffrey E Shokler

NGC-6888 Crescent Nebula

Really stoked about my first ever, real data from my new dedicated astronomy camera! I managed to get focusing figured out and was able to capture this 10 minute exposure of the Crescent Nebula in H-alpha (Hydrogen Alpha). This image is essentially straight from the camera - the only thing I did to it was stretch it so you could see the data.

I had the sensor at -10C during the exposure, notice how there's very little noise! I feel like I'm on quite the ride with the learning curve on this camera. But, I'm happy to have been able to capture this data on just my second night out with it.

The Crescent Nebula in Cygnus (NGC 6888; Caldwell 27) is an emission nebula located about 4,700 light years from us. This nebula is formed by the Wolf-Rayet star HD 192163 which is shedding its outer envelope. That shed mass (about a Sun's worth every 10,000 years) is colliding with older, slower moving ejecta creating heat and shock waves along a front/shell ca. 25 light years across. In this image, at least, it creates a subtle structure against an amazing star-scape in Cygnus.

Stellarvue 130EDT (f7)
Celestron CGEM mount
Astrel AST8300-X mono CCD camera
Astronomik H-alpha filter (12nm)
1x10 min exposure
Sensor temperature -10C
Guided (Lacerta MGEN II)
PixInsight (stretched)
Photoshop (re-scaled for web)

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