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==Observations== |
==Observations== |
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[[Meissa|λ Orionis]] Orionis (also known as '''Meissa''' or '''Heka''') is the star representing the head of [[Orion (constellation)|Orion]] and can be found to the [[North]] of the quadrangle defined by the stars [[Betelgeuse]], [[Bellatrix]], [[Rigel]] and [[Saiph]]. This star can be found at the centre of open cluster [[ Collinder 69 | Collinder 69]] composed of fourth and fifth-magnitude young hot stars, visible to the naked eye. It can be resolved with a pair of binoculars. The star phi2 Orionis , an orange giant which can bee seen in the southeastern of the cluster, is not part of this region, although it might appear to be so due to projection effects. Its distance from the Sun is, in fact, only 116 light-years, as opposed to over 1400 light-years for the cluster itself and its associated nebula. Conversely, the nebula itself is not visible with binoculars or small amateur telescopes. It becomes clearly visible in long exposure photographs. |
[[Meissa|λ Orionis]] Orionis (also known as '''Meissa''' or '''Heka''') is the star representing the head of [[Orion (constellation)|Orion]] and can be found to the [[North]] of the quadrangle defined by the stars [[Betelgeuse]], [[Bellatrix]], [[Rigel]] and [[Saiph]]. This star can be found at the centre of open cluster [[ Collinder 69 | Collinder 69]] composed of fourth and fifth-magnitude young hot stars, visible to the naked eye. It can be resolved with a pair of [[binoculars]]. The star [[phi2 Orionis]] , an [[orange giant]] which can bee seen in the southeastern of the cluster, is not part of this region, although it might appear to be so due to projection effects. Its distance from the [[Sun]] is, in fact, only 116 [[light-years]], as opposed to over 1400 [[light-years]] for the cluster itself and its associated nebula. Conversely, the nebula itself is not visible with [[binoculars]] or small amateur [[telescopes]]. It becomes clearly visible in long exposure [[photographs]]. |
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Revision as of 23:55, 19 November 2016
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Sharpless 264, also known as the Lambda Orionis Ring, is a molecular cloud and H II region, which can be seen in the northern region of the Orion Molecular Cloud Complex (OMCC), in the constellation of Orion. The OMCC is one of the best-known star formation regions and the closest sector of the Milky Way to our Solar System where high-mass stars are born. The nebula is named after its main star, λ Orionis, a blue giant responsible for the ionization of the surrounding material.[1] It is also sometimes called the Angelfish Nebula due to its resemblance to an angelfish.
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Observations
λ Orionis Orionis (also known as Meissa or Heka) is the star representing the head of Orion and can be found to the North of the quadrangle defined by the stars Betelgeuse, Bellatrix, Rigel and Saiph. This star can be found at the centre of open cluster Collinder 69 composed of fourth and fifth-magnitude young hot stars, visible to the naked eye. It can be resolved with a pair of binoculars. The star phi2 Orionis , an orange giant which can bee seen in the southeastern of the cluster, is not part of this region, although it might appear to be so due to projection effects. Its distance from the Sun is, in fact, only 116 light-years, as opposed to over 1400 light-years for the cluster itself and its associated nebula. Conversely, the nebula itself is not visible with binoculars or small amateur telescopes. It becomes clearly visible in long exposure photographs.
External links
References
- ^ Mathieu, R. D., The λ Orionis Star Forming Region, in Handbook of Star Forming Regions, Volume I: The Northern Sky ASP Monograph Publications, vol. 4, Bo Reipurth, December 2008, p. 757, ISBN 978-1-58381-670-7.