M8

M8 = NGC6523 ( 18h 03.8m -24°23´, ~4 mag )
Lagoon Nebula was discovered in 1747 by Le Gentil but its associated open star cluster NGC6530 was noticed by Flamsteed in 1680. Messier observed it on May 23, 1764.

M8 The Lagoon Nebula (diffuse nebula)
M17 The Omega, Swan, or Horseshoe Nebula (diffuse nebula)
M18 (open cluster)
M20 The Triffid Nebula (diffuse nebula)
M21 (open cluster)
M22 (globular cluster)
M23 (open cluster) ...

M8 (NGC 6523) is a marvellous diffuse nebula known as the "Lagoon Nebula".

M8 (NGC 6523, Lagoon Nebula)
M11 (NGC 6705, Wild Duck Cluster)
M13 (NGC 6205, Great Cluster in Hercules)
M16 (NGC 6611)
M17 (NGC 6618, Omega Nebula)
M20 (NGC 6514, Trifid Nebula)
M27 (NGC 6853, Dumbbell Nebula)
M31 (NGC 224, Andromeda Galaxy) ...

The famous Lagoon Nebula, M8, is probably the best of the diffuse nebula and one of the finest in the sky. As it is of 6th mag the naked eye can see it in a dark night.

DENIS 1048-39 (also DENIS 1048-3956 or DENIS-P J104814.7-395606.1) is a very cool and dim, main sequence red dwarf (M8.5 V) or brown dwarf.

The Hourglass Nebula (NGC 6523) in M8
A planetary nebula is a nebula formed from by a shell of gas which was ejected from a certain kind of extremely hot star (a red giant or supergiant). As the giant star explodes, the core of the star is exposed.

It is about 60% dimmer than M8, and spans half a degree across the sky. This nebula lies almost directly above the Lagoon nebula, just 1/4 of a degree further to the south.

At practically every dark area sampled between M16 and M8, this molecule is present in surprisingly large abundance (although it is still far less common than H2).

Known more commonly as the Lagoon Nebula, M8 is a beautiful cloud of gas illuminated by a 5.9 magnitude star inside. The nebula is about 150 light-years in diameter and lies about 5,200 light-years from Earth.

The Lagoon Nebula (also known as Messier Object 8 (M8) and NGC 6523) is a giant interstellar cloud and H II region, in the constellation Sagittarius.

bright, diffuse nebula in the southern constellation Sagittarius; cataloged as M8 or NGC 6526. It is visible to the naked eye and has an angular area larger than that of the full moon.

A compact H II region in the center of M8.
Hoyle-Narlikar Theory
A reformulation of the general theory of relativity that incorporates and extends Mach's principle (q.v.).

The Lagoon Nebula, M8, is just below center, while the open clusters M7 and M6 lie to the left of the Scorpion's lower tail. The center of the Galaxy lies down and to the right of M8.

The image of the Lagoon Nebula (M8) is also taken by the Hubble Space Telescope. It lies approximately 5,200 light-years away, and was originally discovered in 1747.

Birth of Stars
Lagoon Nebula, M8
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A multiplicative factor is appended to the end of the class (e.g. M8 = 8 x 10-5 W m-2)
x-ray flare termination
The end time is defined as the time the flux has decayed to 1/2 the peak flux of the event.

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 ...

It changes brightness as it pulsates due to upward traveling shock waves, with a long period due to its large distended size of the star, which is an M6 . However, the spectral type changed from M8 at minimum brightness to M2 at maximum brightness.

at infrared wavelengths; (3) absence of discrete features in low-dispersion spectra; and (4) strong and rapidly varying polarization at visual and radio wavelengths. [H76]
Lagoon Nebula
An emission nebula in Sagittarius 2 kpc distant. (M8, ...

nebulae which glow red due to hydrogen's strongest spectral line); dark nebulae do not emit or reflect light, but are visible in silhouette against a brighter background of stars or diffuse nebulae; examples of diffuse nebulae include the M8 in ...

It contains no fewer than 15 Messier objects, ony two of which are identified here. Sagittarius is a zodiacal constellation, so the ecliptic, the apparent path of the Sun, among the stars, pases through it, between M8 and M20 (see below).

See also: Nebula, Star, Light, Sky, Lagoon Nebula