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Encyclopedia > Cone Nebula
Cone Nebula

Taken on April 2, 2002 by the Hubble Telescope Image File history File links Size of this preview: 591 × 599 pixel Image in higher resolution (3690 × 3743 pixel, file size: 10. ... The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble. ...

Observation data: J2000.0 epoch
Type: Diffuse + Dark
Right ascension: 06h 41m 06s[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


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. It has been suggested that this article or section be merged into Julian epoch. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... In astronomy, diffuse nebulae is the common term for both reflection nebulae and emission nebulae. ... Dark Nebula Dark Nebula (Dark Zero in the original Japanese version) is a fictional character in the Kirby series of video games for Nintendo. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... This article or section does not cite its references or sources. ... This article or section does not cite its references or sources. ... Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east. ... Remote Authentication Dial In User Service (RADIUS) is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... The Christmas Tree Cluster (also known as Open Cluster NGC 2264 or the Xmas Tree Cluster, and sometimes incorrectly referred as NGC 2264) is an open cluster in the Monoceros constellation. ... In astronomy, diffuse nebulae is the common term for both reflection nebulae and emission nebulae. ... NGC 604, a giant H II region in the Triangulum Galaxy. ... Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east. ... For other persons named William Herschel, see William Herschel (disambiguation). ... 1785 was a common year starting on Saturday (see link for calendar). ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ...


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. The Christmas Tree Cluster (also known as Open Cluster NGC 2264 or the Xmas Tree Cluster, and sometimes incorrectly referred as NGC 2264) is an open cluster in the Monoceros constellation. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ...


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 Triangulum Emission Nebula NGC 604 lies in a spiral arm of Galaxy M33, 2. ... NGC 2264 is the designation number of the New General Catalogue that identifies five astronomical objects as a single object: the Cone Nebula, the Christmas Tree Cluster, Snowflake Cluster, Fox Fur Nebula and the Philippine Nebula. ... The Christmas Tree Cluster (also known as Open Cluster NGC 2264 or the Xmas Tree Cluster, and sometimes incorrectly referred as NGC 2264) is an open cluster in the Monoceros constellation. ... Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east. ... Procyon (α CMi / α Canis Minoris / Alpha Canis Minoris) is the brightest star in the constellation Canis Minor and the eighth brightest star in the nighttime sky. ... Betelgeuse (Alpha (α) Orionis) (also written Betelguese and Betelgeux) is a semiregular variable star located 427 light-years away [1]. It is the second brightest star in the constellation Orion, and the ninth brightest star in the night sky. ...


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. An emission nebula is a cloud of ionized gas ( a plasma) emitting light of various colors. ...


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. The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble. ...


Notes and References

  1. ^ a b c SEDS information on NGC2264
  2. ^ Photograph for Astronomy Picture of the Day
  3. ^ 2,700 × sin( 10′ / 2 ) = 3-4 ly. radius

External links


edit
Christmas Tree Cluster |Snowflake Cluster |Cone Nebula |Fox Fur Nebula |Philippine Nebula

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Cone Nebula is a difficult dark nebula in front of Sh2-273 diffuse nebula, so big that is bigger than the photographic field.
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