Barnard's Loop (Sharpless 2-276) is an emission nebula in the constellation of Orion. It is part of a giant molecular cloud which also contains the bright Horsehead and Orion nebulae. The stars within the Orion Nebula are believed to be responsible for ionizing the loop. Color Data: 46x120sec at iso 1600 Astronomik CLS Clip Filter Hydrogen Alpha: 15x600sec at iso 1600 Baader 2 inch 7nm H alpha filter Step Down Rings