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Contains:  Crescent nebula, NGC 6888
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The Crescent Nebula In Bicolor, 


The Crescent Nebula In Bicolor

The Crescent Nebula In Bicolor

Technical card

Resolution: 4403x3269

Dates:June 30, 2019July 1, 2019

Astrodon Ha 3nm 36mm: 18x600" (gain: 200.00) -15C bin 1x1
Astrodon OIII 3nm 36mm: 16x600" (gain: 200.00) -15C bin 1x1

Integration: 5.7 hours

Darks: ~25

Flats: ~20

Bias: ~200

Avg. Moon age: 27.57 days

Avg. Moon phase: 4.56%

Bortle Dark-Sky Scale: 1.00

Temperature: 10.00 job: 2783561

RA center: 303.070 degrees

DEC center: 38.355 degrees

Pixel scale: 0.831 arcsec/pixel

Orientation: 92.158 degrees

Field radius: 0.633 degrees

Data source: Traveller



"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". "



License: None (All rights reserved)

Sky plot

Sky plot


The Crescent Nebula In Bicolor,