NGC 2174
| Emission nebula | |
|---|---|
| H II region | |
| File:Fragment of NGC 2175.tiff | |
| Observation data: J2000 epoch | |
| Right ascension | 06h 09.7m[1] |
| Declination | +20° 30′[1] |
| Distance | 6,400[citation needed] ly (2,000 pc) |
| Apparent magnitude (V) | 6.8[citation needed] |
| Apparent dimensions (V) | 40′[citation needed] |
| Constellation | Orion |
NGC 2174 (also known as Monkey Head Nebula) is an H II[1] emission nebula located in the constellation Orion and is associated with the open star cluster NGC 2175.[1] It is thought to be located about 6,400 light-years away from Earth. The nebula may have formed through hierarchical collapse.[2]
There is some equivocation in the use of the identifiers NGC 2174 and NGC 2175. These may apply to the entire nebula, to its brightest knot, or to the star cluster it includes. Burnham's Celestial Handbook lists the entire nebula as 2174/2175 and does not mention the star cluster.[3] The NGC Project (working from the original descriptive notes) assigns NGC 2174 to the prominent knot at J2000 06h 09m 23.7s, +20° 39′ 34″ and NGC 2175 to the entire nebula, and by extension to the star cluster.[4] Simbad uses NGC 2174 for the nebula and NGC 2175 for the star cluster.[1] [5]
References
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- NGC 2174: Emission Nebula in Orion, 12 June 2008 Astronomy Picture of the Day
- NGC 2174: Stars Versus Mountains, 9 February 2011 Astronomy Picture of the Day
- Monkey Head Nebula at Constellation Guide
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- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[dead link]
- ↑ Robert Burnham, Jr, Burnham's Celestial Handbook, Dover, 1978, p. 1280.
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