National Astronomical Observatory of Japan

Okayama Astrophysical Observatory 188-cm Reflector Telescope


Okayama Astrophysical Observatory 188-cm Telescope

When Okayama Astrophysical Observatory opened in 1960, the 188-cm Reflector Telescope was said to be “the best telescope in the Orient.” It boasted the 7th largest diameter in the world. After that, large telescopes such as the 8.2 meter diameter Subaru Telescope were constructed one after another, and the 188-cm Reflector Telescope is no longer considered a “large” telescope. However, even after half a century has passed since the telescope was installed, the 188-cm Reflector Telescope is still used for cutting-edge research observations thanks to updates to the drive system and control system, as well as the development of new observation instruments. In particular, it is expected to be active in exploring extrasolar planets and investigating their planetary atmospheres, leading to the discovery of a second Earth.

Text by: Hiroyuki Toda (Okayama Astrophysical Observatory)
Translation by: Hiroko Tsuzuki and Ramsey Lundock (Public Relations Center, NAOJ)

Image Data

DateAugust, 2016
PhotographerYutaka Iijima
CreditNational Astronomical Observatory of Japan
Terms of UseThis image can be used without permission for research presentations, conferences, and school classes. In other cases, it cannot be used without prior permission. If you would like to use it, please fill out an application. In the case of commercial use, a photograph usage fee might need to be negotiated with the photographer, Mr. Yutaka Iijima.


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