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NGC 6888 | by infinitalavita
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NGC 6888

Constellation: Cygnus.

Session: 08, 21, 26, 27 Jul 2020.


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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 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[citation needed] 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".


Source: Wikipedia



• Optics: Takahashi FSQ-85EDX super apo (quadruplet 85/450).

• Mount: Skywatcher N-EQ6 Pro (mod).

• Filters: Astronomik Ha (12 nm, 36mm), OIII (12 nm, 36mm).

• Accessories: QHYCCD QHYCFW-2-M motorized filter wheel, Primalucelab Sesto Senso, Primalucelab Eagle 3S.

• Camera: QHY163M mono camera.


• Ha: 43x300s | binning 1x1 | Gain 0 | Offset 30 | cooled - 10°c.


• OIII: 43x300s | binning 1x1 | Gain 0 | Offset 30 | cooled - 10°c.


• Integration: 7.17 hours.

• Correction: Darks, Flats, Bias, Dark Flats.


• Skies quality: Bortle 5/10, SQM 19.55.

• Setup sampling: 1,74 arcsec/pixel.

• Field of view: 2.25 ° x 1.7 °.


• Notes: Cropped, light polluttion, problem with guide, mapped HOO bicolor.


• Softwares: Pixinsight, Adobe Photoshop.


© • Cristian Cestaro

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Taken on July 27, 2020