Less well-known is the nearby arc comprising Barnard's Loop
, an emission nebula included by Herschel in his list of 52 nebulous regions.
The picture showed, with remarkable clarity, not only the familiar Orion Nebula and the diffuse Horsehead complex around Zeta Orionis, but also the feathery, winding form of Barnard's Loop
Using a fast 50-mm lens and a modified DSLR, I was shocked to clearly record Barnard's Loop
and the Horsehead Nebula in Orion above the majestic Himalayan peaks with only a 20-second exposure.
The Orion and Horsehead nebulae, though two of the most famous deep-sky objects in the heavens, are almost lost in the general tangle of nebulosity inside the arc of Barnard's Loop
is the remarkably long arc of nebulosity that sweeps through Orion in a huge semicircle about 12[degrees] in diameter.