Lagoon Nebula (Messier 8)
White Mountains, Grandview Campground, California – June 23, 2017
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QSI 683wsg-8 -25° C * Takahashi FSQ-106EDX III * f/5
HaRGB 4.5 hr total.
Ha 20 min x 8 = 2.7 hr
Use H-alpha as luminance.
R 4 min x 11 = 0.73 hr
G 4 min x 8 = 0.53 hr
B 4 min x 8 = 0.53 hr
The Lagoon Nebula is a large emission nebula of hot gas and dust in the constellation Sagittarius. It is a nursery for star formation, and visible to the naked eye from dark locations.
The nebula is rich in reddish Hydrogen-alpha (Ha) emissions which are picked up in long exposures (but appear greyish-white to your eye through a telescope).
Here the Ha image is the Luminance channel which combines with separate RGB exposures to create the final image.
Photo ID: M8 HaRGB v2