Crescent Nebula (NGC6888)

Bill Richards

Bill Richards

Well-Known Member
The Crescent Nebula (aka NGC6888) is an emission nebula about 5000 light-years from Earth. It is formed by the fast stellar wind from a Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the star when it became a red giant 250,000 - 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.

This is the result of over 6-1/2 hours of exposure time taken on 7/14/23 and 9/8/23.

Crescent Nebula-NGC6888.jpg


Equipment and Software:
=======================
Mount: iOption CEM40 w/iPolar
Telescope: Celestron EdgeHD 8 w/0.7x focal reducer
Auto-Focuser: Rigel Systems nFOCUS
Imaging Camera: ASI2600MC-Pro
Filter: AstroHutech NBZ dual-band filter
Guide Camera: ASI174MM-Mini on OAG
Imaging Software: NINA
Guiding Software: PHD2
Image Processing Software: PixInsight

Exposure Details:
=================
Camera Temperature -10C
Bias: 50
Gain: 100
48 x 120s (no filter)
75 x 240s (dual band filter)
Plus 32x Darks, Flats, and Dark Flats

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JimFox

JimFox

Moderator
Staff member
Wow Bill! Love this so much!

I would say that this is one of the better Crescent nebula's that I have seen. It might be I haven't paid enough attention to all of the details of it, but I had never realized the wispy blue that appears to emanate from it. That's really cool.
 
Bill Richards

Bill Richards

Well-Known Member
JimFox said:
Wow Bill! Love this so much!

I would say that this is one of the better Crescent nebula's that I have seen. It might be I haven't paid enough attention to all of the details of it, but I had never realized the wispy blue that appears to emanate from it. That's really cool.
Click to expand...
Thanks, Jim. I'm pretty pleased with the result as well.
 
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