California Institute of Technology

Chajnantor Observatory


Click on thumb-nails for full-size images.

Observatory Location

The Chajnantor Observatory is on a high, dry site to ensure that atmospheric brightness fluctuations do not limit the sensitivity of the instrument. The facility is located at longitude 67°46' W, latitude 23°02' S. This is at an altitude of 5080 m about 40 km east of San Pedro de Atacama in Chile. The site on the 10-km plateau of Llano de Chajnantor and the horizon is below 6° except for one peak at 8°. It is close to the center of the Atacama Large Millimeter Array, currently under construction.

Map of the Chajnantor Plateau, showing the location of the Chajnantor Observatory (“CBI Project”) in relationship to ALMA and other facilities (courtesy of the ALMA project).

ALMA Site Map

Observatory Plan

Schematic plan of the observatory, and aerial photograph.

CO Site plan CO aerial photo

Power Plant

Photos of the new tank catchment basin (Ricardo Bustos, 2006-11-01).




Photo of the laboratory (2000-08).

Control Room

Residencia Don Esteban

Some photos of the accommodations in San Pedro (Nov 2006).