Flaming Star



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.

Equipment and processing

Telescope: 135mm F2.8 lens

Mount: Meade LXD55

Camera: Canon T1i

Filters: Astronomik Ha 12nm

Guiding: PHD

Processing: Photoshop, DSS, Fitswork

Capture software: BackYardEOS

Exposures: Ha: 108x300 ISO1600 RGB: 195x30 ISO400

Location: Parsippany,NJ

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