M 17 – NGC 6618


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M17 is also known as the Omega Nebula, the Swan Nebula or even the Horseshoe Nebula. The first one is the most popular name. It is a very bright emission nebula discovered independently (within some weeks) during spring 1746, by Philippe Loys de Chéseaux and Charles Messier. Located in Sagittarius, it is, visually, a neighbor of another conspicuous nebula, M16, the Eagle Nebula. More than 30 massive stars are embedded in the nebula, ionizing it with ultraviolet light and provoking its hydrogen-red glow. This nebula is an active star forming region.

Additional Information


Name(s): M 17, NGC 6618, the Omega Nebula

Type: Emission Nebula

RA:  18h 20m 47s

Dec: -16º 10’ 55”

Constellation: Sagittarius

Size (arcmin): 46×37

Magnitude: +6

Distance: 5,000 ly


Date: 2013-01-31

Location: Corbera de Llobregat, Barcelona, Catalonia

Size (arcmin): 34×26

Telescope: Celestron 11” HD f/10

Camera: FLI ML6303 (3072x2048pix)

Guiding: Orion SSAG/Nikkor 500mm f/8

Processing: CCDStack, Photoshop CC 2016

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