Mount Lemmon Survey

Mount Lemmon Survey is an astronomical observatory located high in the Coronado National Forest that operates a large reflecting telescope designed for wide-field observations. The facility uses specialized cameras at prime focus to scan large portions of the sky in search of celestial objects.

The observatory began operations in 1994 as part of a program focused on detecting objects that orbit near Earth. Over the following decades it has systematically mapped and catalogued thousands of these bodies.

This survey contributes to international space research by sharing astronomical data with scientists and researchers from institutions worldwide for celestial object studies.

The mountain location offers exceptionally clear viewing conditions with minimal light pollution, greatly enhancing observations. Visitors should know that the site is difficult to reach and roads can become challenging during winter.

The facility has discovered and confirmed more than 50,000 asteroids during its decades of operation, ranking among the most prolific discovery sites in the world. This remarkable track record places it among the most productive locations for asteroid discovery anywhere.

Location: Mount Lemmon

Location: Coronado National Forest

Location: Summerhaven

Official opening: 1994

Elevation above the sea: 2,800 m

Part of: Catalina Sky Survey

Website: http://lpl.arizona.edu/css/css_facilities.html

GPS coordinates: 32.44200,-110.78931

Latest update: December 10, 2025 20:10