Bloody sky

Not so long time ago I presented Crescent Nebula in hydrogen alpha emission line. The picture was black and white, but in fact the color that corresponds to hydrogen alpha line (656nm) is deep red. So this time I have made a few more exposures in RGB colors to catch some star hue and mixed it with hydrogen alpha signal using HaRGB technique. The result is as follows:

2013-09-28-ngc6888-hargb

The Crescent Nebula (NGC6888) is placed about 4000 light years away and is formed by stellar wind from Wolf-Rayet star colliding with slower moving wind ejected by the star.

Clear skies!

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