Calar Alto Observatory

Calar Alto Observatory sits at about 2,160 meters on a mountain peak in the Sierra de Los Filabres range in southern Spain. It holds several telescopes, including a 3.5-meter reflector that ranks as mainland Europe's second-largest observation instrument.

The facility opened in 1975, marking the beginning of German-Spanish cooperation in astronomical research. It started with a 1.23-meter reflector telescope and was gradually expanded with additional instruments.

The facility forms part of Spain's Unique Scientific and Technical Infrastructures network, contributing to astronomical research and education programs.

The high mountain location offers excellent viewing conditions and minimal light pollution from surrounding areas. Visitors should expect cool temperatures and prepare for changing weather at this elevation.

Researchers here discovered an Earth-like planet about 40 light-years away using advanced spectroscopic techniques. This discovery demonstrated the power of the telescopes and research methods available at this site.

Location: Gérgal

Location: Bacares

Elevation above the sea: 2,168 m

Part of: Unique Scientific and Technical Infrastructures

GPS coordinates: 37.22361,-2.54611

Latest update: December 8, 2025 13:41