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Contains:  M 17, NGC 6618, Omega nebula
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M17,  The Swan Nebula, 


            Steven Bellavia
M17,  The Swan Nebula
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M17, The Swan Nebula

Technical card

Dates:Aug. 4, 2019

Astronomik 6nm OIII: 9x300" (gain: 50.00) -15C bin 1x1
Optolong 7nm Ha 2": 5x300" (gain: 50.00) -15C bin 1x1

Integration: 1.2 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 3.89 days

Avg. Moon phase: 16.20%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 21.30

Mean FWHM: 4.50

Temperature: 20.00

Basic astrometry details job: 2843323

RA center: 18h 20' 57"

DEC center: -16° 7' 48"

Pixel scale: 1.360 arcsec/pixel

Orientation: 183.873 degrees

Field radius: 0.817 degrees

Resolution: 3600x2400

Data source: Traveller


M17, known as the Swan or the Omega nebula, 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
M17 is approximately 5,500 light-years from Earth and is 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.
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.
The open cluster NGC 6618 lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars; however, the actual number of stars in the nebula is much higher - up to 800, with 100 of spectral type earlier than B9, and 9 of spectral type O, plus over a thousand stars in formation on its outer regions. It is also one of the youngest clusters known, with an age of just 1 million years.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


M17,  The Swan Nebula, 


            Steven Bellavia