M17, Omega Nebula


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.

Imaging telescopes or lenses: APO Triplet 105 F 6.5
Imaging cameras: Orion StarShoot Pro V2.0 Color
Mounts: Gemini G42 Observatory+
Guiding telescopes or lenses: Tamron 500 mm f/8 SP
Guiding cameras: Philips Vesta Pro
Filters: Hutech IDAS LPS-P2
Resolution: 3040×2024
Dates: July 12, 2010
Frames: 20×300″ bin 1×1
Integration: 1.7 hours
Avg. Moon age: 0.21 days
Avg. Moon phase: 0.05%
RA center: 275.203 degrees
DEC center: -16.149 degrees
Pixel scale: 1.544 arcsec/pixel
Orientation: -1.892 degrees
Field radius: 0.784 degrees
Locations: Italy, None; Villanova (Cepagatti) Pescara, None
Author: Tullio Di Primio