Cone Nebula

Cone Nebula
Emission nebula
H II region
dark nebula
	Taken on April 2, 2002 by the Hubble Space Telescope
Observation data: J2000.0 epoch
Right ascension	06h 41m 15s
Declination	+09° 21′
Distance	2,700 ly
Apparent magnitude (V)	—
Apparent dimensions (V)	3 arcmins
Constellation	Monoceros
Physical characteristics
Radius	4 ly
Absolute magnitude (V)	—
Notable features	Christmas Tree Cluster
Designations	NGC 2264 (portion)
	See also: Lists of nebulae

The Cone Nebula is an H II region in the constellation of Monoceros. It was discovered by William Herschel on December 26, 1785, at which time he designated it H V.27. The nebula is located about 830 parsecs or 2,700 light-years from Earth. The Cone Nebula forms 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.

^ ^a ^b ^c "SEDS information on NGC2264". Students for the Exploration and Development of Space. Retrieved 2009-03-27.
^ Nemiroff, R.; Bonnell, J., eds. (7 January 2002). "The Mysterious Cone Nebula". Astronomy Picture of the Day. NASA. Retrieved 2009-03-27.
^ 2,700 × sin( 10′ / 2 ) = 3-4 ly. radius

[SEDS-1] "SEDS information on NGC2264". Students for the Exploration and Development of Space. Retrieved 2009-03-27.

[NASA-2] Nemiroff, R.; Bonnell, J., eds. (7 January 2002). "The Mysterious Cone Nebula". Astronomy Picture of the Day. NASA. Retrieved 2009-03-27.

[3] 2,700 × sin( 10′ / 2 ) = 3-4 ly. radius

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