Barnard's loop


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Barnard's loop

or

ring

(bar -nardz) see Orion.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Barnard's loop

[′bär·nərdz ‚lüp]
(astronomy)
A large emission nebula, about 10° by 140° in size, around the central portion of Orion, that consists of an expanding shell of gas that probably originated in a supernova.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Caption: COLORFUL BOUNDARY The giant molecular clouds within Orion are home to a variety of challenging targets, including dark nebula LBN 1622 at top left and reflection nebula M78 at bottom right, separated by a brighter portion of Barnard's Loop.
Barnard criticized him, saying that 90-minute exposures weren't long enough, as he himself had photographed some of Herschel's regions (especially what we now call Barnard's Loop)--nebulosity that Roberts claimed didn't exist (S&T: June 2016, p.
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.
Dominating the bottom center of the image is the constellation Orion and Barnard's Loop, the distinctive crescent-shaped nebula around the celestial giant's Sword.