M17
The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, 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 and has a mass of 30,000 solar masses. The total mass of the Omega Nebula is an estimated 800 solar masses.

It is considered one of the brightest and most massive star-forming regions of our galaxy. Its local geometry is similar to the Orion Nebula except that it is viewed edge-on rather than face-on. (Wikipedia)

This comprises LRGB data - sadly, I mucked up the alignment so the Ha data in the previous image can't be easily added to this. This comprises about 3 hours of Lum, 2 hours of G and B and 1 hour of R. There is more R data to come - hopefully the weather gods play nicely soon.

Taken with SBIG STX16803 mounted on PW CDK 12.5 scope. Lum data is unbinned and RGB are binned x2 - all images are 300 seconds.