NGC 1990: Difference between revisions
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'''NGC 1990''' is a [[reflection nebula]] which is a [[molecular cloud]] of [[Epsilon Orionis]]. The stellar winds from Epsilon Orionis, or [[Alnilam]], distribute the nebula approximately up to 2,000 [[km/s]], more than 20 million times that of the stellar winds of the [[Sun]]. |
'''NGC 1990''' is a [[reflection nebula]] which is a [[molecular cloud]] of [[Epsilon Orionis]]. The stellar winds from Epsilon Orionis, or [[Alnilam]], distribute the nebula approximately up to 2,000 [[km/s]], more than 20 million times that of the stellar winds of the [[Sun]]. |
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'''NGC 1990''' was discovered by [[William Herschel]] in 1786 with an 18.7 inch telescope. However, there is doubt that this object exists in reality as several visual searches and modern astrophotography have failed to identify the exact location and extent of the reflection nebula. Modern photographs of the area with cameras show ultraviolet leak that gives the false impression of a large blue nebula around ε Ori ([[Alnilam]]). More careful photography does not reveal a nebula in the area. |
'''NGC 1990''' was discovered by [[William Herschel]] in 1786 with an 18.7 inch telescope. However, there is doubt that this object exists in reality as several visual searches and modern astrophotography have failed to identify the exact location and extent of the reflection nebula. Modern photographs of the area with cameras show ultraviolet leak that gives the false impression of a large blue nebula around ε Ori ([[Alnilam]]). More careful photography does not reveal a nebula in the area. V |
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visual surveys do not reveal the nebula either. |
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== References == |
== References == |
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Revision as of 01:30, 30 March 2024
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (January 2018) |
| Emission nebula | |
|---|---|
| H II region | |
| reflection nebula | |
 Nebulosity near around Orion's Belt | |
| Observation data: J2000 epoch | |
| Right ascension | 05h 36m 16.2s |
| Declination | −01° 12′ 07″ |
| Constellation | Orion |
NGC 1990 was discovered by William Herschel in 1786 with an 18.7 inch telescope. However, there is doubt that this object exists in reality as several visual searches and modern astrophotography have failed to identify the exact location and extent of the reflection nebula. Modern photographs of the area with cameras show ultraviolet leak that gives the false impression of a large blue nebula around ε Ori (Alnilam). More careful photography does not reveal a nebula in the area. V
visual surveys do not reveal the nebula either.
References
- "Simbad query". Retrieved October 5, 2009.
- "The NGC/IC Project". Retrieved June 5, 2017.[permanent dead link]
External links
Media related to NGC 1990 at Wikimedia Commons
 | This nebula-related article is a stub. You can help Wikipedia by expanding it. |