A new 10 m radio telescope to observe in the sub-millimeter band was completed and joined to the RAINBOW interferometer in February 2000 to obtain extremely high sensitivity and spatial resolution.

The RAINBOW interferometer is a seven element interferometer with a large collecting area that is used in the development of observational radio astronomy with millimeter and sub-millimeter bands. It consists of the Nobeyama Millimeter Array -- six 10 m element antennas -- and a 45 m radio telescope.

This telescope was relocated from Nobeyama to Atacama Desert in northern Chilie in March 2002 to make experimental observations at sub-millimeter bands.