Orion is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous and recognizable constellations in the night sky. It is named after Orion, a hunter in Greek mythology.​ Deep in this constellation, there is a loop extends over about 600 arcminutes as seen from Earth, covering much of Orion the hunter himself. It is well seen in long-exposure photographs, although observers under very dark skies may be able to see it with the naked eye.

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Barnard's Loop (catalogue designation Sh 2-276) is an emission nebula in the constellation of Orion. It is part of the Orion Molecular Cloud Complex which also contains the dark Horsehead and bright Orion nebulae. The loop takes the form of a large arc centered approximately on the Orion Nebula. The stars within the Orion Nebula are believed to be responsible for ionizing the loop.

Recent estimates place it at a distance of either 159 pc (518 light years) or 440 pc (1434 ly) giving it dimensions of either about 100 or 300 ly across respectively. It is thought to have originated in a supernova explosion about 2 million years ago, which may have also created several known runaway stars, including AE Aurigae, Mu Columbae and 53 Arietis, which are believed to have been part of a multiple star system in which one component exploded as a supernova.

Although this faint nebula was certainly observed by earlier astronomers, it is named after the pioneering astrophotographer E. E. Barnard who photographed it and published a description in 1894.

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IN this image, one can make out the well-known Orion Nebula (M42) and the Horsehead Nebula (IC434), which are in fact close in vicinity to each other. 

A total of 5 clear nights was used to image this object with an average of 1-1.5hours each night)

Technical:
Camera: QHYCCD 294M-Pro (main), QHY5Lii-M (guide)

Lens: Tamron 17-50mm F/2.8 @ 50mm F/4 (Main), William Optics Uniguide 50mm (Guide)
Mount: iOptron CEM-70
Filters: Antlia 3.5nm Ha, 3nm Oiii, 3.5nm Sii
PC: Beelink Mini PC (Gemini M)
Software used: SGPro, Pixinsight, Photoshop, Deep-Sky-Stacker