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Object Type: Emission nebula
Constellation: Cygnus
Magnitude:
Size: 20'

Commonly called the Crescent Nebula, NGC 6888 lies amid faint nebulosity in Cygnus. The nebula is a shell of gas ejected by the star near its center, which is being impacted by stellar winds from the same star.

Equipment: Meade 14" LX200R/STL-11000M/Astrodon LRGB filters/Paramount ME
F-ratio: f/9.5
Exposures: RRGB: R 24 x 11 minutes, binned 2x2: G 24 x 5 minutes: B 24 x 5 minutes: GB binned 3x3
Date: September 2, 7, and 8, 2007
Location: Landers, California, USA
Technical Notes: Individual exposures were obtained using CCDAutoPilot2 and then sigma combined. The RGB image was created in Registar 1.0. A High-Pass Filter of 4 pixels was applied to the bright portion of the luminance image. A Gaussian Blur of 1 pixel was applied to the RGB image. The luminance image was combined with the RGB image at 50% opacity and then flattened; the resulting image was combined again with the luminance image at 100% opacity. The RGB image was duplicated and combined with the original using Soft Light to enhance color saturation.