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


            Thomas Richter
Crescent Nebula - NGC6888 Ha

Crescent Nebula - NGC6888 Ha

Technical card

Imaging telescope or lens:GSO 8" f/5 Newton

Imaging camera:Moravian G2-8300FW

Mount:SkyWatcher NEQ6 Pro Goto

Guiding telescope or lens:Viewfinder 8x50

Guiding camera:Astrolumina Alccd5L-IIc

Focal reducer:TS Coma corrector 2"

Software:PHD2 GuidingDSS, Fitswork, Gimp

Filter:Baader Ha 2" 7nm

Resolution: 3335x2504

Dates:June 18, 2016

Frames:Baader Ha 2" 7nm: 11x600" -20C bin 1x1

Integration: 1.8 hours

Flats: ~30

Bias: ~100

Avg. Moon age: 12.93 days

Avg. Moon phase: 96.22%

Temperature: 12.00 job: 1339657

RA center: 303.007 degrees

DEC center: 38.387 degrees

Pixel scale: 1.220 arcsec/pixel

Orientation: 90.980 degrees

Field radius: 0.707 degrees

Locations: Nürnberg, Nürnberg, Bayern, Germany


Object description (

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. It was discovered by Friedrich Wilhelm 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".



Thomas Richter
License: None (All rights reserved)


  • Final
    Crescent Nebula - NGC6888 Ha, 


            Thomas Richter
  • Crescent Nebula - NGC6888 Ha, 


            Thomas Richter

Sky plot

Sky plot


Crescent Nebula - NGC6888 Ha, 


            Thomas Richter

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