1) Ascertainable 2) Determinable 
• (a.) Capable of being discovered, found out, or perceived; as, many minute animals are discoverable only by the help of the microscope; truths discoverable by human industry.
Dis·cov'er·a·ble adjective Capable of being discovered, found out, or perceived; as, many minute animals are discoverable only by the help of the microscope; truths discoverable by human industry.