The Trifid Nebula

37. The Trifid Nebula


Messier 20  RA: 18h 02.3'  Dec: -23 02'   Sagittarius (Sgr)

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The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II region located in Sagittarius. It was discovered by Charles Messier on June 5, 1764. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars; an emission nebula (the lower, red portion), a reflection nebula (the upper, blue portion) and a dark nebula (the apparent 'gaps' within the emission nebula that cause the trifurcated appearance; these are also designated Barnard 85). Viewed through a small telescope, the Trifid Nebula is a bright and peculiar object, and is thus a perennial favorite of amateur astronomers.The Trifid Nebula is a star-forming region in the Scutum spiral arm of the Milky Way.

The most massive star that has formed in this region is HD 164492A, an O7.5III star with a mass more than 20 times the mass of the Sun.

This star is surrounded by a cluster of approximately 3100 young stars.
 

Image Information

Location Starfest 201
Date Aug 27 2011
Optics AstroTech AT8IN
Filters Baader MPCC
Mount Celestron CGE
Camera Canon/Hutech T1i
ISO 800
Subexposures 11
Exposure Length 300
Guider WO ZS66SD/ST-4
 

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All images copyright © 2006-2020, Rick Saunders
Main text descriptions sourced from Wikipaedia.
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