Mount Nyūkasa Optical Observatory
Satellite imagery: Esri, Maxar, Earthstar Geographics
Mount Nyūkasa Optical Observatory stands at 1,816 metres on Mount Nyūkasa in Nagano Prefecture, Japan, a mountain site chosen for its clear, high-altitude air.
About Mount Nyukasa Optical Observatory
The observatory is operated by the Japan Aerospace Exploration Agency (JAXA) as part of its remote observation network. Rather than studying distant stars and galaxies, its main job is tracking objects in low Earth orbit, helping determine and refine their orbital paths.
Location & getting there
At 1,816 metres, the site sits well above the surrounding Nagano countryside, with views that on clear days extend toward Mount Fuji. The elevation and mountain setting give the instruments steadier, cleaner air than a lowland location would offer.
Visiting Mount Nyukasa Optical Observatory
As an operational JAXA facility focused on satellite and orbital-debris tracking rather than public astronomy, it is not set up as a general visitor attraction. Check JAXA's official channels for any current access information before planning a trip.
See your named star from here
While this observatory's own work points at orbiting hardware rather than distant suns, Nagano's mountain skies are still a fine place to look up. Name a star and use its coordinates from the star catalogue to know exactly where to look.
Opening hours and public-visit programs vary by season. Check Google Maps for current times before you travel.