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Contains:  Omega nebula, M 17, NGC 6618, M 18, NGC 6613, IC 4701
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Messier 18 or M18 between Messier 17 or M17 ( Omega Nebula) and Sagittarius Star Cloud (M24)., 





    
        

            Stephen Harris
Messier 18 or M18 between Messier 17 or M17 ( Omega Nebula) and Sagittarius Star Cloud (M24).

Messier 18 or M18 between Messier 17 or M17 ( Omega Nebula) and Sagittarius Star Cloud (M24).

Technical card

Resolution: 4584x3006

Dates:Sept. 29, 2016

Frames: 70x20"

Integration: 0.4 hours

Avg. Moon age: 28.14 days

Avg. Moon phase: 2.17%

Astrometry.net job: 1261788

RA center: 274.688 degrees

DEC center: -17.100 degrees

Pixel scale: 1.939 arcsec/pixel

Orientation: -71.530 degrees

Field radius: 1.477 degrees

Locations: HAS Dark Site , Columbus, Texas, United States

Description

Messier 18 or M18 (also designated NGC 6613) is an open cluster of stars in the constellation Sagittarius. It was discovered by Charles Messier in 1764 and included in his list of comet-like objects. From the perspective of Earth, M18 is situated between the Omega Nebula (M17) and the Sagittarius Star Cloud (M24). Its age is estimated at 32 million years. It is 4,900 light-years away.

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Author

astrosmh
Stephen Harris
License: None (All rights reserved)
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Messier 18 or M18 between Messier 17 or M17 ( Omega Nebula) and Sagittarius Star Cloud (M24)., 





    
        

            Stephen Harris