NGC 7822, in the constellation of Cepheus, is an emission nebula.
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This picture probably represents the limit of what I can achieve. It was taken with a 2-minute exposure in my MX716 camera through an Astromonik Hα filter. The nebula was hardly visible on the preview screen and I hoped to capture more nebulosity to the north of this main band which is why I have missed more nebulosity to the south. The picture required extreme processing to increase the gamma both before and after stacking. Date and Time: 24th October 2010 22:44 to 22:31 UT Camera: MX716 Telescope: LX200 with 0.33 focal reducer and Astronomik Hα filter. Capture: star_mx7. 37 frames, 120" exposure Processing: star_mx7. Dark subtraction, non-linear stretch 25, background. Irfanview. Conversion to PNG format Registax. Stacked 37 frames, gamma as below,  histogram 20-255.PhotoImpact. Trimming and preparation for colouring. Photoshop. Colouring. |
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