Alpha Carinae II was a Class M planet in the Canopus system with two major landmasses and a number of islands. It was inhabited by an intelligent species.
The geologist Carstairs once visited this planet while serving in the Merchant Marines on a geology survey for a mining company.
On Stardate 4729 the USS Enterprise surveyed this planet as a test of the M-5 computer's capabilities. (TOS: "The Ultimate Computer")