The Submillimeter Array (SMA) is an 8-element radio interferometer located atop Maunakea in Hawaii. Operating at frequencies from 180 GHz to 418 GHz, the 6m dishes may be arranged into configurations with baselines as long as 509m, producing a synthesized beam of sub-arcsecond width. Each element can observe with two receivers simultaneously, with 12 GHz bandwidth each per sideband, for a total of 48 GHz processed bandwidth. The digital correlator backend provides a uniform resolution of 140 kHz, across the entired processed bandwdith. The Submillimeter Array is a joint venture of the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics.

The proposal preparation system is now open for Semester 2026A (16 May 2026-15 Nov 2026).

Full Call for SMA Science Observing Proposals