I don't know what to say, just that this is my April project started because I tried a 1800s single frame from it and also M20 the trifid, and both where impressive, but the M16 Eagle Nebula won my heart and my edit process to submit it to
@Nico Carver Discord challenge that really rock!, so I continued to shoot these to call them projects.
Crescent Nebula
Obj: NGC6888
Dist.: 5000 LY
Mag. 7.4
Constellation: Cygnus
RA: 20h 12m 7s
DEC: +38° 21.3′
Expositions: tot. 12h20m @ 600s
Bortle Scale: 4-5
Optics: RC8
Reduce/Flattener: n/a 1624mm FL
Cam: ZWO ASI533MC Pro
Guider: ASI120MM & 50mm Finder
Mount: SW EQ6-Ri
Filters: IDAS 2" LPS D3
Software: N.I.N.A.
Edition: PixInsight
Info:
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) 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.
It is a rather faint object located about 2 degrees SW of Sadr. For most telescopes it requires a UHC or OIII filter to see. Under favorable circumstances a telescope as small as 8 cm (with filter) can see its nebulosity. Larger telescopes (20 cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".
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