Fenton Hill Observatory is an astronomical research facility operated by Los Alamos National Laboratory in the Jemez Mountains of New Mexico, about 35 miles (56 km) west of Los Alamos. The site is home to several astronomical experiments and observatories spanning 30 acres (120,000 m²). It is also known as Technical Area 57 (TA-57) and is located at an elevation of 8,700 feet (2,700 m) in a region shielded from light pollution.