The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula (catalogued asMessier 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 matterof 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.
Imaging telescopes or lenses: Celestron C8 SCT
Imaging cameras: Nikon D5000
Mounts: Skywatcher HEQ5 Pro Goto
Guiding telescopes or lenses: Orion ShortTube 80
Guiding cameras: QHYCCD QHY5L-II Mono
Focal reducers: Celestron f/6.3 Focal Reducer/Corrector
Software: DeepSkyStacker, photoshop
Dates: July 7, 2013
Integration: 0.3 hours
Autor: Leandro Fornaziero
AstroPhotography of the day by SPONLI
26 February 2014
We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.