I finished up the Lobster Claw Sunday night with some 3...

I finished up the Lobster Claw Sunday night with some 3 nanometer Oxygen3 data. The Lobster Claw (Sh2-157), the Bubble Nebula, and so much more, extending over the border from Cassiopeia into Cepheus. The squarish bright region, Sh2-157a, at the joint of the top bluish arc of the Claw is a denser emission structure surrounding the Wolf Rayet star WR-157. The Bubble Nebula is middle top (NGC 7635, Sharpless 162, Caldwell 11), and the bright emission region below and to the right is NGC 7538. That cluster of stars above the Bubble Nebula is Messier 52 (M52). The Lobster Claw Sh2-157 is about 8000 lightyears away.