抄録
The TMT is a project to build an extremely large 30-meter optical/infrared telescope under the
collaboration of five partner countries including Japan, USA, Canada, China, and India. In 2014, an
agreement was executed among the participating organizations to found TMT International Observatory
(TIO) to construct TMT on Maunakea. The onsite construction was halted because the supreme court of
Hawai'i ruled in favor of a claim that cited a problem in the approval process of the land use permit for
the Maunakea Conservation District and remanded it in December 2015. Although this has caused
delays to construction onsite, mass production of the telescope primary mirror, design works of the
telescope subsystems including science instruments have proceeded according to plan in the partner
countries. The land use permit was approved again in September 2017, TIO is preparing to start on-site
construction at Maunakea in 2018.
