ScienceDownEast | ScienceDownEast Astrophotography | Nebulae | NGC 6888 Crescent Nebula | Crescent Nebula + Soap Bubble

The Crescent Nebula NGC 6888 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 Soap Bubble Nebula (also known as PN G075.5+01.7) is a planetary nebula in the constellation Cygnus, to the left of the Crescent Nebula (NGC 6888). The nebula derives its name from its symmetrical spherical shape which resembles a soap bubble. It was discovered by amateur astronomer Dave Jurasevich using an Astro-Physics 160 mm refractor telescope with which he imaged the nebula on June 19, 2007.

Note: click on the image to view it at the full resolution of the uploaded image, then click again for actual size.

A total of 6.67 hours exposure (11 x 20 min subs).

Exposure	11@1200 sec
Gain	100
Camera	ATR2600C [6224 x 4168]
Optics	Skywatcher Esprit 120mm Refractor
Filter	Radian Triad Ultra Quad-Band Narrowband Filter
Guiding	Phd2 using a ToupTek GPM462M on an 60x400mm Guide scope
Controller	Kstars on MeLe Quieter 4C running Ubuntu 24.04
Location	Lower Sackville, Nova Scotia.
Date	2025-09-12
PixInsight Processing	WeightedBatchPreprocessing Script BlurXTerminator GraxPert background removal NoiseEXterminator StarXTerminator HistogramTransform Generalized Hyperbolic Stretch

---