Cerro Armazones Observatory is an astronomical observatory owned and operated jointly by the Ruhr University Bochum (RUB) and the Catholic University of the North (UCN). It was established in 1995 on the slopes of Cerro Armazones, a mountain in the Antofagasta Region of Chile.The observatory is located in the Atacama Desert about 110 kilometres (68 mi) south of the city of Antofagasta. Unlike many other observatories, OCA is not located at the highest point of its host mountain. Instead, it sits in a saddle approximately 340 metres (1,120 ft) below the summit and 1 kilometre (0.62 mi) to the southwest.
The Hexapod-Telescope is located 500 metres (1,600 ft) further to the west and 100 metres (330 ft) higher than the other telescopes, on a subsidiary peak of Cerro Armazones, Cerro Murphy.On 26 April 2010, the European Southern Observatory Council selected Cerro Armazones as the site for the planned European Extremely Large Telescope.The telescope will be located at the summit of the mountain at an altitude of 3,060 metres (10,040 ft).
The 1.5 metres (59 in) Hexapod-Telescope reflector is named for its unusual mount, consisting of six high-precision struts supporting a platform to which the telescope is attached. It was developed and tested by RUB in Germany, and moved to Cerro Armazones in 2006.
A 0.84 metres (33 in) Newtonian telescope made by Halfmann Teleskoptechnik was installed by UCN in 1995.
The 0.81 metres (32 in) Infra Red Imaging Survey telescope is a Nasmyth reflecting telescope on an alt-azimuth mount. It was made by Halfmann Teleskoptechnik and installed in 2010.
A 0.41 metres (16 in) reflector made by Meade Instruments is owned by UCN.
The 0.25 metres (9.8 in) Berlin Exoplanet Search Telescope II reflector made by Takahashi Seisakusho was installed in 2007 and is owned by the DLR Institute for Planetary Research.
The Variable Young Stellar Object Survey (VYSOS-6) telescopes are two 0.15 metres (5.9 in) refractors made by Takahashi Seisakusho on a common German equatorial mount.