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{{Diffuse nebula
| image = [[File:Nebula-Barnard's-Loop.jpeg|230px]]
| caption = Barnard's Loop can be seen on this image as a diffuse red semicircle.
| name = Barnard's Loop
| type = Emission
| epoch = J2000.0
| ra = 05<sup>h</sup> 31<sup>m</sup>
| dec = -04° 54&prime;
| dist_ly = [[1 E19 m|1,600]] [[light year|ly]]
| appmag_v = ??
| size_v = 10[[Degree (angle)|°]]
| constellation = [[Orion (constellation)|Orion]]
| radius_ly = 150 ly
| absmag_v = -
| notes = -
| names = Sh 2-276
'''Barnard's Loop''' (catalogue designation '''[[Sharpless catalog|Sh 2]]-276''') is an [[emission nebula|emission]] [[nebula]] in the [[constellation]] of [[Orion (constellation)|Orion]]. It is part of a [[giant molecular cloud]] which also contains the bright [[Horsehead Nebula|Horsehead]] and [[Orion Nebula|Orion]] nebulae. The loop takes the form of a large [[Arc (geometry)|arc]] centred approximately on the Orion Nebula. The stars within the Orion Nebula are believed to be responsible for ionizing the loop.
The loop extends over about 600 [[arcminute]]s as seen from Earth, covering much of Orion. It is well seen in long-exposure photographs, although observers under very dark skies may be able to see it with the [[naked eye]].
It is estimated to lie at a distance of approximately 1600 [[light year]]s, giving it actual dimensions of about 300 light years across. It is thought to have originated in a [[supernova]] explosion about 2 million years ago. Several known [[runaway star]]s may have resulted from the same explosion. [[AE Aurigae]], [[Mu Columbae]] and [[53 Arietis]] are thought to have been<ref name="">{{cite web|url=|publisher=David Darling|title=The Internet Encyclopedia of Science: Barnard's Loop (Sh 2-276)|accessdate=2008-04-22}}</ref> part of a multiple star system in which one component exploded as a supernova about 2 million years ago.
Image:Nebula-Barnard's-Loop-bw-inverse.jpeg|Above photo of Barnard's Loop nebula in inverted black and white of the red channel; the loop can now be seen better.
Image:BarnardLoopHunterWilson.jpg|Barnard's Loop imaged with a combination of white light and [[hydrogen alpha]] light bringing out the color and detail of this vast structure. [[Messier 42]] and the [[Horsehead Nebula]] can be seen as well. Courtesy of Hunter Wilson.
==External links==
*Gaylard M.J. (1984), ''Detection of the H 142-alpha line from the Barnard Loop'', Monthly Notices of the Royal Astronomical Society, v. 211, p.149
*Reynolds R.J., Ogden P.M. (1979), ''Optical evidence for a very large, expanding shell associated with the I Orion OB association, Barnard's loop, and the high galactic latitude H-alpha filaments in Eridanus'', Astrophysical Journal, v. 229, p.942
*[ Photograph identifying several nebulae in Orion]
*[ ''Encyclopaedia of Astrobiology, Astronomy, and Spaceflight'' entry]
[[Category:H II regions]]
[[Category:Orion complex]]
[[ca:Anell de Barnard]]
[[de:Barnard’s Loop]]
[[en:Barnard’s Loop]]
[[fr:Boucle de Barnard]]
[[it:Anello di Barnard]]
[[nl:Barnard's Loop]]
[[pt:Loop de Barnard]]
[[ru:Петля Барнарда]]
[[tr:Barnard İlmiği]]