Subaru Telescope, Optical telescope at Mauna Kea, United States.
The Subaru Telescope is an optical facility on Mauna Kea in Hawaii, United States, housing a primary mirror that measures 8.2 meters (27 feet) across and works with both visible and infrared wavelengths. The dome and technical structure sit at high altitude on a volcanic peak, supporting nine specialized instruments for observing objects across the sky.
Construction began in 1991 under the National Astronomical Observatory of Japan and reached completion in 1998. The first scientific observations took place in 1999, opening a new chapter for Japanese research on the Hawaiian summit.
The name comes from a public contest held in 1991, when "Subaru" was chosen as the Japanese word for the Pleiades cluster. The telescope is operated as an international facility: astronomers worldwide submit observing proposals twice a year, and only those that pass review are carried out.
The telescope is a working research facility, not open to casual visitors; observing time is granted to astronomers through twice-yearly proposal calls and carried out largely by remote control from the Hilo base facility about 30 km away. The summit sits at 4,205 m, where altitude sickness is a real risk, so acclimatize slowly and watch for headaches or breathlessness.
The mirror system relies on 261 computer-controlled actuators that make tiny adjustments as the orientation shifts during observations. This active control maintains optical quality even when the instrument tilts and moves throughout the night.
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