Ginganomori Observatory in Japan (Rikubetsu Town) — Japan's Largest Public Telescope in a Designated Starry Sky Town
Overview
Ginganomori Observatory (Rikubetsu Uchuu Chikyuu Kagaku-kan/Rikubetsu Space and Earth Science Museum) is a public astronomical observatory in Rikubetsu Town, Ashoro County, Hokkaido. Since 1987, Rikubetsu Town has held the official designation of "Starry Sky Town" from the Ministry of the Environment, and in 1997 was recognized as one of the "10 Towns Most Friendly to Starry Skies," establishing it as one of Japan's premier stargazing destinations.
The observatory is home to a 115cm reflecting telescope—among Japan's largest public-access instruments—allowing observations of nebulae and galaxies invisible to the naked eye.
Observation Environment
Located in Hokkaido's interior, Rikubetsu Town is surrounded by minimal light pollution from major urban centers. During winter, continental high-pressure systems produce clear skies and low temperatures that enhance atmospheric transparency.
With an elevation of only about 340m, the flat surrounding terrain nonetheless provides unobstructed views extending to the horizon. On favorable nights, the Milky Way appears distinctly, and low-latitude auroras are occasionally observed.
Facilities and Equipment
In addition to the main 115cm reflecting telescope, the facility includes two 30cm and one 25cm reflecting telescopes, plus a 4-channel solar telescope. Daytime observing includes sunspot and prominence observation, while evening sessions feature seasonal celestial objects with professional staff commentary.
The facility includes a planetarium and exhibits on space and earth science, ensuring enjoyment even under unfavorable weather conditions.
Access and Visitor Information
Approximately 2 hours by car from central Obihiro, or 2.5 hours from Tokachi-Obihiro Airport. Public transportation is limited, making rental cars recommended. Winter road conditions require caution due to icing.
The facility operates Wednesday-Sunday and holidays (closed Monday-Tuesday), with summer hours from 2:00 PM to 10:30 PM and winter hours from 1:00 PM to 9:30 PM. Evening viewing sessions require no advance reservation for individuals, though groups are encouraged to notify in advance. Parking is complimentary.
Observing Tips
Rikubetsu Town experiences some of Japan's coldest winters, with temperatures frequently dropping below -20°C. Comprehensive cold-weather preparation is essential: hand warmers, insulated clothing, gloves, and hats are mandatory. Telescope eyepieces may frost over; lens cleaning cloths are valuable to bring.
Summer offers relatively pleasant conditions ideal for Milky Way observation, though insect repellent is recommended. Spring and autumn provide excellent conditions for galaxy and star cluster observation.