The Nobeyama Radio Observatory (NRO) is an astronomical observatory located near Minamimaki, Nagano, Japan at an elevation of 1350 metres. It is a division of the National Astronomical Observatory of Japan (NAOJ) and consists of four radio instruments.
- The 45-m Radio Telescope: A 45-m single-dish radio telescope that operates in short-millimetre wavelengths. Its receivers operate at 1, 2, 3.75, 9.4, 17, 35, and 80 GHz in both left and right polarizations.
- The Nobeyama Millimetre Array (NMA): A millimetre interferometer consisting of six 10-m diameter telescopes.
- The Nobeyama Radioheliograph (NoRH): An array of eighty-four, 80 cm antennas dedicated to solar observations. Their receivers operate at 17âÂÂ34 GHz in both left and right polarizations.
- The Nobeyama Radio Polarimeters: A set of radio telescopes that continuously observes the full Sun at the frequencies of 1, 2, 3.75, 9.4, 17, 35, and 80 GHz, at left and right circular polarization.
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