High Quality Content by WIKIPEDIA articles! The Discovery Channel Telescope (DCT) is a 4.3-meter aperture telescope being built by Lowell Observatory in Flagstaff, Arizona and will be the fifth largest telescope in the continental United States once completed in 2012. The DCT is currently under construction at a dark sky site on the Coconino National Forest near Happy Jack, Arizona. Happy Jack is located at an elevation of 7,760 feet (2,370 m) and is approximately 45 miles SSE of Flagstaff. The project is a partnership between Discovery Communications and Lowell Observatory. In its initial implementation, the telescope will cost approximately $53 million. The telescope will significantly augment Lowell Observatory’s observational capability and enable pioneering studies in a number of important research areas.