North America and Pelican Nebulae (narrowband)
This pair of nebulae are located in the constellation Cygnus, and are approximately 2200 light years distant. Though they have separte designations, they are in fact part of the same gas cloud. The brightest portion of the North America Nebula corresponds to Mexico, and the brightest region seen there is often referred to as the "Great Wall".
This is a false colour image with Sulfur-II mapped to red, Hydrogen-alpha mapped to green, and Oxygen-III mapped to blue.
Takahashi Sky 90 at f/4.5
SBIG STL-4020M (remote guide head)
Ha/SII/OIII: 3 hours each channel (20 minute subexposures)
Processed with Maxim/DL, Registar, CCDStack, and Photoshop CS4
Noel Carboni's Astronomy Tools