description Calar Alto Observatory Overview
Calar Alto Observatory is an optical and infrared astronomical facility in the Sierra de los Filabres in Almeria, southern Spain. Founded in 1973 through German-Spanish scientific cooperation, it operates several telescopes, including a 3.5-meter instrument used for imaging, spectroscopy, and surveys. Its high-altitude site and range of instruments support professional research on stars, galaxies, exoplanets, and other astronomical targets, and it is the largest observatory complex on mainland Europe.
help Calar Alto Observatory FAQ
Where is Calar Alto Observatory located?
Calar Alto Observatory sits on the Calar Alto plateau in the Sierra de los Filabres, in Almeria province, southern Spain. The site is about 2,168 meters above sea level, according to the [official observatory overview](https://www.caha.es/).
When was Calar Alto Observatory founded, and by whom?
It was founded in 1973 through German-Spanish scientific cooperation. The observatory is now jointly operated by the Institute of Astrophysics of Andalusia, CSIC, and the Andalusian Government.
What telescopes are at Calar Alto Observatory?
The complex has five telescopes, including the 3.5-meter telescope, described by CAHA as the largest telescope on the European continent. Other listed apertures include 2.2, 1.23, and 0.8 meters.
How do astronomers use Calar Alto Observatory?
Astronomers use proposal-based visitor mode or service mode on the 2.2-meter and 3.5-meter telescopes, so the facility is a research observatory rather than a drop-in stargazing site. Daytime public visits are guided and last about two hours.
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