Gekko Tenmondai (月光天文台 "Moonlight Observatory") is an

astronomical observatory An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysical, oceanography and volcanology are examples of disciplines for which observatories have been constructed. His ...

located in the

Shizuoka Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Shizuoka Prefecture has a population of 3,637,998 and has a geographic area of . Shizuoka Prefecture borders Kanagawa Prefecture to the east, Yamanashi Prefecture to the northea ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. It was founded in 1957 and is owned by the ''International Foundation for Cultural Harmony''. Between 1987 and 2000, the astronomers Yoshiaki Oshima and Tetsuo Kagawa discovered 172 minor planets at this site. In 2000, this observatory was ranked 40th in the world for total asteroid discoveries. Asteroid 4261 Gekko is named after this observatory. The IAU code for this observatory is 888. The name of the observatory means "moonlight".

References

* * Astronomical observatories in Japan {{observatory-stub