Cone Nebula

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Observation data: J2000.0 epoch
Cone Nebula
Taken on April 2, 2002 by the Hubble Telescope
Type	Diffuse + Dark
Right ascension	06^h 41^m 06^s^[1]
Declination	+09° 53′^[1]
Distance	2,700 ly^[2]
Apparent magnitude (V)	—
Apparent dimensions (V)	10 arcmins^[1]
Constellation	Monoceros
Physical characteristics
Radius	4 ly^[3]
Absolute magnitude (V)	—
Notable features	Christmas Tree Cluster
Other designations	NGC 2264 (portion)
See also: Diffuse nebula, Lists of nebulae
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The Cone Nebula (also known as NGC 2264) is an H II region in the constellation of Monoceros. It was discovered by William Herschel in 1785. The nebula is located about 800 parsecs or 2,600 light-years away from Earth.

The Cone Nebula is part of the nebulosity surrounding the Christmas Tree Cluster. The designation of NGC 2264 in the New General Catalogue refers to both objects and not the nebula alone.

1 General information
2 See also
3 Notes and References
4 External links

[edit] General information

The diffuse Cone Nebula, so named because of its apparent shape, lies in the southern part of NGC 2264, the northern part being the magnitude-3.9 Christmas Tree Cluster. It is in the northern part of Monoceros, just north of the midpoint of a line from Procyon to Betelgeuse.

The cone's shape comes from a dark absorption nebula consisting of cold molecular hydrogen and dust in front of a faint emission nebula containing hydrogen ionized by S Monocerotos, the brightest star of NGC 2264. The faint nebula is approximately seven light-years long (with an apparent length of 10 arcminutes), and is 2,700 light-years away from Earth.

William Herschel discovered the Cone Nebula (which he designated H V.27) on December 26, 1785. It is part of a much larger star-forming complex—the Hubble Space Telescope was used to image forming stars in 1997.