Nobeyama Radio Observatory (NRO)
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Nobeyama Millimeter Array
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The radio astronomy facility of the National Astronomical Observatory of
Japan, founded in 1978 and located 120 km west of Tokyo at Minamisaku, Nagano.
It has played a pioneering role in millimeter wave astronomy through use
of a 45-meter dish and the Nobeyama Millimeter Array – an aperture-synthesis
telescope consisting of six 10-m antenna movable along two intersecting
500-m baselines. These instruments are the world's largest at millimeter
wavelengths and work in conjunction, locally as the 7-element RAINBOW interferometer
and globally as part of the VLBI Space Observatory Program. NRO is also
home to the Nobeyama Radioheliograph, which investigates solar radio emission
using 84 dishes of 0.8-m aperture in a T-shaped array.
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