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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula - NGC6888, 


            Jan Sjoerd de Vries
Crescent Nebula - NGC6888

Crescent Nebula - NGC6888

Acquisition type: Electronically-Assisted Astronomy (EAA)

Technical card

Resolution: 1663x1252

Dates:Aug. 23, 2019

Astrodon Ha 5nm H-alpha 1.25": 20x900" -10C bin 1x1
Astrodon OIII 5nm [OIII] 1.25": 20x900" -10C bin 1x1
Astrodon SII 5nm [SII] 1.25": 20x900" -10C bin 1x1

Integration: 15.0 hours

Darks: ~100

Flats: ~100

Bias: ~250

Avg. Moon age: 22.02 days

Avg. Moon phase: 51.31%

Mean FWHM: 2.30

Temperature: 20.00 job: 2923219

RA center: 303.041 degrees

DEC center: 38.345 degrees

Pixel scale: 1.846 arcsec/pixel

Orientation: 4.511 degrees

Field radius: 0.534 degrees

Locations: e-EyE, Fregenal de la Sierra, Extremadura, Spain

Data source: Own remote observatory

Remote source: e-EyE Extremadura


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 (Wikipedia).



Jan Sjoerd de Vries
License: None (All rights reserved)

Sky plot

Sky plot


Crescent Nebula - NGC6888, 


            Jan Sjoerd de Vries