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NGC 6888 The Crescent Nebula



This data for this image was taken in April 2012, it was one object that I have found interesting but not the most photogenic of the large nebulas. The interesting part is the various gases surrounding the main core of the nebula, and the presence of one of the rare Wolf-Rayet stars which help form the glow that makes the Crescent Nebula visible.

The Crescent Nebula is an emission nebula and considered a bubble type nebula, it was discovered by Friedrich Wilhelm Herschel in 1792, and is believed to have been formed from the stellar wind from the rare bright Wolf-Rayet star near the center of the nebula, which is presently colliding with slower moving stellar material from the same star that was ejected during its earlier red giant phase.

NGC 6888 is located approximately 4,900 light years from earth and named Crescent Nebula because of the unusual shape; I think Potato Nebula would be more suiting. It is classified as a Wolf-Rayet nebula, such nebulas are formed when a very massive and very hot star ejects its outer layers into a strong stellar wind and then the ejected material collapses back into itself which results in a collision of the shell and two shock waves of moving material, one moving outward and one moving inward.

This image was taken in April, 2012

 

This image consists of 24 X 10 minute RGB*, 35 X 10 minutes L*, and 38 X 10minutes HA* and 39 X 10 minutes OIII*  30.6 hours total

 

Equipment:      Software: Site:
Telescope
Mount
Camera
Hyperion 12.5
Mountain Instruments MI250
SBIG STL11000
Maxim DL 4.64
The Sky 6
Photo Shop CS2

Oak Hills Observatory
Hesperia, Ca.