The Nayuta Telescope, named after the Sanskrit term for a vast number, weighs approximately 70 tons.
The facility is operated by the Nishi-Harima Astronomical Observatory (NHAO), which functions as a division of the University of Hyogo.
Its location at an elevation of 450 meters provides a natural horizon barrier that limits atmospheric turbulence.
The observatory is equipped with specialized spectrographs used for deep-space chemical analysis.
The site includes accommodation facilities, allowing guests to stay overnight for extended observation periods.
The dome is designed to rotate, allowing the 2-meter telescope to track objects across the entire night sky.
The Hyogo Kenritsu Nishiharima Observatory houses the Nayuta Telescope, one of the largest public-use optical telescopes in Japan with a 2-meter aperture. Located on the summit of Mt. Ohirasan in Sayo, the facility serves as both a research hub and a public outreach center. Visitors can observe celestial bodies during designated nighttime viewing sessions or explore the telescope dome during daytime tours. The observatory is situated in an area specifically chosen for its minimal light pollution, providing clear skies for high-quality astronomical observation. The main building features educational exhibits detailing the mechanics of the telescope and current astronomical research.
The exterior viewing deck looking out over the surrounding Sayo mountain ranges.
Bring a warm jacket even in summer, as the mountain summit temperatures drop significantly after sunset.
Check the official observatory website in advance to reserve specific viewing programs, as walk-ins are often restricted.
Dress in layers, as you will move between the climate-controlled control room and the unheated telescope dome.
Attempting to visit without checking the observation schedule, as the site is occasionally restricted to researchers during specific solar or deep-space events.
Closed on certain weekdays for maintenance and public holidays; check the website for specific nocturnal viewing event calendars.
Maintain silence inside the telescope dome to avoid disturbing delicate observation equipment and researchers.
