The Omega Nebula, also known as the Swan Nebula, the Lobster Nebula and the Horseshoe Nebula (catalogued as Messier 17 or M17 and as NGC 6618) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is located in the rich starfields of the Sagittarius area of the Milky Way.

The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter. The total mass of the Omega Nebula is an estimated 800 solar masses.

A open cluster of 35 stars lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars

http://en.wikipedia.org/wiki/Omega_Nebula

 

ABOUT THE IMAGE

DATE/TIME:  Evening of July 6th, 2010.

CAMERA:  Canon XSI, 450D modified

TELESCOPE:  Orion 100ED @ F/9

ISO SETTING:  1600

EXPOSURES:  13

EXPOSURE LENGTH:  600sec.

TOTAL EXPOSURE LENGTH:  2hrs, 10min.

SUBTRACTIONS: 20 dark frames and 10 bias frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3

 

 

 

 

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