Veil Nebula - Supernova Remnant

The Veil Nebula is a supernova remnant located in the Cygnus constellation. Part of the visible portion of the Cygnus loop, it was  discovered by William Herschel on September 5, 1784. It is comprised of ionized gas and dust and is about 2,500 light-years away, according to the Far Ultraviolet Spectroscopic Explorer data. It is a result of one or more supernove explosions that occurred more than 15,000 years ago. The entire Veil Nebula covers an area more than 3 degrees, which is 6 times the diameter of the full moon. This image was used in my "Deep Sky Imaging with Small Scopes" talk at the Stellafane convention.

5nm Narrowband Hydrogen-alpha filter: 10 images x 600-second sub frames, binned 1x1, Total= 1-hour. AstroTech AT66, 66mm, f/5 ED Refractor using an AstroTech flat field corrector, SBIG STL-6303E monochrome CCD camera, Losmandy Gemini G-11 EQ mount. Image acquisition by CCD Soft V5. Processing by CCD Stack and Adobe Photoshop. ATMoB Clubhouse, Westford, MA, 16 July 2015.