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

Technical card

Resolution: 5946x3834

Dates:June 2, 2018June 9, 2018June 18, 2018

Astronomik 12nm Ha: 86x120"
Baader Planetarium OIII 8.5nm: 90x120"
Baader Planetarium UV/IR Cut: 90x60"

Integration: 7.4 hours

Avg. Moon age: 16.14 days

Avg. Moon phase: 46.21%

Bortle Dark-Sky Scale: 5.00 job: 2162364

RA center: 302.738 degrees

DEC center: 38.720 degrees

Pixel scale: 1.499 arcsec/pixel

Orientation: 359.913 degrees

Field radius: 1.473 degrees

Locations: Backyard, Parrish, FL, United States

Data source: Backyard


The Crescent Nebula is located in Cygnus near the star Sadr, about 5000 light-years away from Earth. At the heart of the Crescent is the Wolf-Rayet star WR 136. A Wolf-Rayet star, one of the most luminous and hottest types of stars, is the next stage in the short life of a massive star. After the red giant stage and the expulsion of its hydrogen layer, the Wolf-Rayet stage is the “last hurrah” before it goes supernova. The waves seen here in the Crescent are the result of a fast stellar wind caused by the rapid ejection of hot mass from WR 136 colliding with the slower moving, cooler gas previously ejected by the star when it was in the red giant stage. The force of the collision between the two creates shock waves moving in opposite directions from each other and the excitation causes the gases to glow.



Jarrett Trezzo
License: None (All rights reserved)



made the OIII more prominent in this version


a blend of the other two versions

Sky plot

Sky plot


NGC 6888 Crescent Nebula in HaOIIIRGB, 


            Jarrett Trezzo