The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, and the Horseshoe Nebula (catalogued as Messier 17 or M17) 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.
Equipment and processing
Telescope: Orion 8 inch F5
Mount: Orion Atlas
Camera: ST 8300M
Filters: Baader Ha,SII,OIII 7nm
Capture software: Maxim
Exposures: Ha: bin1 65x600 OIII: bin2 37x600 SII: bin2 35x600