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Cerro Tololo, CHILE (U.S.A.) 



CTIO FOUR-METER TELESCOPE 



Cerro Tololo Inter-American Observatory (CTIO) 



National Optical Astronomy Observatory (NOAO) 



"Big Science" Descriptor ; Astronomy 



Description of Facility/Instrument ; This U.S. four-meter aperture 



telescope, located in Cerro Tololo, Chile, is the largest optical 

 telescope in the Southern Hemisphere. 



Date of Construction ; 1967, became operational in 1976 



Construction Cost ; Original : $10. A million 



198A $$ : $27.5 million 



Present International Cooperation 



Nationality(s) of Ownership : U.S. 

 Nationality(s) of Operational Funding ; U.S. 

 Nationality(8) of Management Staff ; U.S. 

 Nationality(s) of Researchers : U.S. and foreign 



The University of Chile has an agreement with the ob- 

 servatory for scientific cooperation in astronomical re- 

 search. Each year, the observatory employs students from 

 Chilean universities. 



Potential for Future International Cooperation : Time on the telescope 

 is available to all qualified scientists on a competitive basis 

 with preference to scientists from North and South America. 



