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Kfir Simon | all galleries >> nebulae > CRESCENT NEBULA
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CRESCENT NEBULA
01-MAY-2009

CRESCENT NEBULA

ALSO KNOWN AS NGC 6888 OR CALDWELL 27 - an emission nebula in the Cygnus constellation, about 5000 light years away. It is formed by the fast stellar wind from the Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 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.

ALSO CAN BE SEEN IN THIS IMAGE IS THE VAST INTERSTELLAR MATERIAL THAT SURROUNDS THE WHOLE CYGNUS CONSTALLATION

HA-RGB IMAGE FROM THE 101 KILOMETER IN ISRAEL
IMAGEN WITH CANON 200 MM LENS WITH DSI PRO 3 - HA FILTER FOR 30 MIN
AND 15 MIN OF COLOR WITH CANON 450 D (ALSO 200MM LENS)
THE LENS WAS AT F 2.8


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