Trifid Nebula, M20
An area of active star formation in our Milky Way galaxy 2,200 light-years away.
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The Trifid Nebula, M20, is probably best known for its three-lobed appearance. The dark areas are lanes of dark dust that obscure the nebula's light. This diffuse nebula is very large, and is located about 5,000 light-years from Earth.
M20 = NGC6514 ( 18h 02.6m -23°02´, 8.5 mag. )
Trifid Nebula in Sagittarius was discovered by LeGentil in 1747 and Messier observed it on June 5, 1764.
M20 The Triffid Nebula
Description: diffuse nebula
Constellation: Sagittarius
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M20 (NGC 6514), the "Trifid Nebula", is another delight, but only with larger scopes, which will bring out the three dark lanes familiar on photographs. In the same field is M 21, an open cluster of about fifty stars.
8 The M20 region shows observational evidence for three broad phases in the birth of a star: (1) the parent cloud (stage 1 of Table 19.1), (2) a contracting fragment (between stages 1 and 2), ...
M20 (NGC 6514, Trifid Nebula)
M27 (NGC 6853, Dumbbell Nebula)
M31 (NGC 224, Andromeda Galaxy)
M32 (NGC 221, companion to M31)
M33 (NGC 598, Triangulum Galaxy)
M42 (NGC 1976, Orion Nebula)
M44 (NGC 2632, Praesepe)
M45 (Pleiades)
M50 (NGC 2323) ...
This is also a dusty nebula which is also known as NGC 6514, or more simply, M20. It is about 60% dimmer than M8, and spans half a degree across the sky.
Figure: The Trifid Neubla (M20). This nebula exhibits many of the features we are describing here: the red light comes from hydrogen Balmer emission, excited by the ultraviolet radiation from a hot star embedded in the nebula.
added article about Spitzer finding stellar incubators in M20 to Current Events
added article about multiple pulsars found in a globular cluster to Current Events ...
The Trifid Nebula (also known as M20 and NGC 6514) is an H II region at right ascension 18h 02.3m and declination -23° 02', located in Sagittarius. The nebula's name means "divided into three lobes".
Hubble investigation ...
The last of the three diffuse nebulae, M20, called Trifid Nebula, got its name from the three dust lanes, which divide the nebula. This structure can only be seen with large telescopes.
M20 The Triffid Nebula (diffuse nebula)
M21 (open cluster)
M22 (globular cluster)
M23 (open cluster)
M24 Milky Way Patch (star cloud with open cluster)
M25 (open cluster)
M28 (globular cluster)
M54 (globular cluster)
M55 (globular cluster) ...
An emission nebula in Sagittarius, ~ 1 kpc distant. (M20, NGC 6514)
Trillion
A thousand billion (1012) in American usage.
AAT 30 Stars in NGC 6514, the Trifid nebula, M20
AAT 93 NGC 6522 in Baade's window
AAT 93a NGC 6522 and NGC 6528 in Baade's window, wide field
AAT 106 NGC 6723, globular cluster
UKS 20 The star clouds of Sagittarius ...
Some of the better known dusty regions in the universe are the diffuse nebula in the Messier catalog, for example: M1, M8, M16, M17, M20, M42, M43 Messier Catalog ...
A Sc II-III spiral galaxy, a satellite of the Andromeda Galaxy, about 700 kpc distant. Mv = -18.9 mag (M33, NGC 598) [H76]
Trifid Nebula
An emission nebula in Sagittarius, ~ 1 kpc distant. (M20, NGC 6514)[H76]
Trillion ...
 See also: Nebula, Star, Telescope, Light, Sagitta
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