Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  M 20  ·  NGC 6514  ·  Trifid Nebula
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M20 (NGC 6514) Trifid Nebula, Bruno LAILLER
M20 (NGC 6514) Trifid Nebula
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M20 (NGC 6514) Trifid Nebula

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M20 (NGC 6514) Trifid Nebula, Bruno LAILLER
M20 (NGC 6514) Trifid Nebula
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M20 (NGC 6514) Trifid Nebula

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Description

The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II region in the north-west of Sagittarius in a star-forming region in the Milky Way's Scutum-Centaurus Arm. It was discovered by Charles Messier on June 5, 1764. Its name means 'three-lobe'. The object is an unusual combination of an open cluster of stars, an emission nebula (the relatively dense, reddish-pink portion), a reflection nebula (the mainly NNE blue portion), and a dark nebula (the apparent 'gaps' in the former that cause the trifurcated appearance, 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 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.

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M20 (NGC 6514) Trifid Nebula, Bruno LAILLER