Celestial hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  PK205+14.1  ·  Sh2-274
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Sh2-274, Medusa Nebula, HαRRGB, 22 Mar 2014 & 24 Feb 2015, David Dearden
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Sh2-274, Medusa Nebula, HαRRGB, 22 Mar 2014 & 24 Feb 2015

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Description

HαRRGB combination of 22 Mar 2014 RGB and 24 Feb 2015 Hα. The R channel is 90% Hα, and this mix was also used for luminance. The original RGB stars were layered back onto most of the image with a layer mask showing the HαRRGB nebula. Finally, the blue stars that showed through the mask were desaturated.

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Sh2-274, Medusa Nebula, HαRRGB, 22 Mar 2014 & 24 Feb 2015, David Dearden