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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula in Ha, 


            Richard Pattie
Crescent Nebula in Ha

Crescent Nebula in Ha

Technical card

Resolution: 1324x1038

Dates:July 16, 2015

Frames:Astronomik Ha 6nm: 21x900" -3C bin 1x1

Integration: 5.2 hours

Darks: ~32

Flats: ~25

Avg. Moon age: 0.42 days

Avg. Moon phase: 0.20%

Bortle Dark-Sky Scale: 7.00

Temperature: 22.00 job: 696914

RA center: 303.059 degrees

DEC center: 38.334 degrees

Pixel scale: 2.666 arcsec/pixel

Orientation: 91.580 degrees

Field radius: 0.623 degrees

Locations: Home, Laguna Woods, CA, United States


The Crescent Nebula (also known as NGC 6888) is an emission nebula in the constellation Cygnus, about 5000 light-years away and 25 light years across. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 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. The star powering all this (WR 136) is burning fuel at a prodigious rate and is nearing the end of its stellar life; it should ultimately go out with a bang in a spectacular supernova explosion. [Source: Wikipedia]



Richard Pattie
License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot


Crescent Nebula in Ha, 


            Richard Pattie