M17 Omega Nebula
Emission nebula and star cluster in Sagittarius: M17 (NGC 6618). Distance is approximately 6,000 light-years. Also known as the Swan Nebula, the Horseshoe Nebula, and the Lobster Nebula.
Shot 18-19 July 2009; Mt. Tamalpais State Park, California; ISO 800, Exp 1 hr, 32.5 min (37x2.5m), f/5.2, Canon EOS 5D & Televue NP127is. Calibration, alignment, & stacking with Images Plus 3.0; other post-processing with Photoshop CS4.
Copyright 1997-2015, by David Wilton