A good night at the River Ridge Observatory – Eagle and Crescent Nebulae

Friday, August 26, 2022 was a good night to observe. I set up my 11″ SCT, Elf, with my ZWO ASI 294 Pro camera at f/6.3. I started with the Eagle Nebula (M16) in Serpens then later I switched to the Crescent Nebula in Cygnus. In both cases, I set up a session of 30 5 minute images at a gain of 300. This means a total of as much as 2.5 hours. The first finished at about 12:30 and the other at 3AM. Around midnight I noticed the Milky Way very bright and that the Pleiades had cleared the trees. Then, I spotted bright orange/red “star” through a gap in the trees that I knew immediately had to be Mars. I had lost track of it and now it was at least two magnitudes brighter than it was the last time I saw it. When I finished and left at 3:40, Orion was just rising.

Both of these images were shot and processed similarly. I used StarNet++ to remove the stars so that I could process the nebula separately.

M16, the Eagle Nebula in Serpens. The nebula contains several active star-forming gas and dust regions, including the “Pillars of Creation”.
NGC 6888, the Crescent Nebula in Cygnus. The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

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