Astronomy:NGC 1990
From HandWiki
Short description: Nebula in the constellation of Orion
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.
References
- "Simbad query". http://cdsweb.u-strasbg.fr/cgi-bin/bibobj?2008A%26A...485..931C&NGC+1990#lab_ident.
- "The NGC/IC Project". http://www.ngcicproject.org/NGC/NGC_19xx/NGC_1990.htm.[yes|permanent dead link|dead link}}]
External links
![]() | Original source: https://en.wikipedia.org/wiki/NGC 1990.
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