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Simons Observatory (SO) is an observatory in development in the Atacama Desert, located at an altitude of 5200 meters, and intended to investigate the cosmic microwave background (CMB). Its four telescopes are under construction: a Large Aperture Telescope (LAT), a six-meter telescope with the same overall design as Fred Young Submillimeter Telescope but operating at 90/150 GHz, and three Small Aperture Telescopes (SATs), 42-centimeter telescopes operating at 27/39 GHz, 90/150 GHz, and 220/270 GHz.
The observatory is located near the existing Atacama Cosmology Telescope (ACT) and the Huan Tran Telescope (HTT, the telescope on which the POLARBEAR instrument is deployed), the latter which is being expanded into the Simons Array (not the same thing as Simons Observatory, though the two are near each other), the expansion including an upgraded POLARBEAR (POLARBEAR-2) and two additional similar telescopes.