The CSO is a research facility. Access is restricted to authorized persons.

Observers are authorized to access the telescope to carry out approved research observations and other activities. All visiting observers must notify the CSO in advance of arrival. Any and all other visitors must obtain advance authorization from the CSO Manager.

We welcome inquiries from the press and other media about research activities at the CSO. The CSO is a Caltech facility located in the University of Hawaii Science Reserve on Mauna Kea. Both Caltech and the University of Hawaii have policies concerning filming and other media activities. Please contact the CSO Manager for details.

We regret we cannot accommodate visits by members of the general public.

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