Alpha Carinae II was the inhabited second planet orbiting Alpha Carinae. Classified as class M, the planet was inhabited by intelligent life. (TOS: "The Ultimate Computer")

The planet was a conventional M-class world with an oxygen-nitrogen atmosphere. On the planet's surface, there were two major landmasses and a number of islands. There were at least twenty-nine other planets that were biologically similar to Alpha Carinae II.

In the mid-23rd century, the geologist Carstairs once visited this planet while serving in the Merchant Marines on a geology survey for a mining company.

In 2268, the USS Enterprise surveyed the planet as a test of the M-5 multitronic unit's capabilities. For that test, the starship was assigned to send a general survey party to the planet's surface. The party was to avoid all contact with the indigenous lifeforms. This test was cancelled by Captain James T. Kirk after he was informed by Chief Engineer Montgomery Scott that the M-5 computer was shutting down systems across the ship. (TOS: "The Ultimate Computer")

In 2328, the planet was home to the Spaceport Alpha Carinae II. (TNG-R: "Inheritance")

For the pre-remastered episode, the planet model for Alpha Carinae II was first used for Capella IV. ("Friday's Child") It was used again for Neural, ("A Private Little War"), Triskelion ("The Gamesters of Triskelion"), the Kelvan planet, ("By Any Other Name"), Ekos. ("Patterns of Force"), Triacus, ("And the Children Shall Lead") an unnamed planet, ("Is There in Truth No Beauty?"}, the Medusan homeworld, ("Is There in Truth No Beauty?"), Beta XII-A, ("Day of the Dove"), the Kalandan outpost ("That Which Survives"), Elba II, ("Whom Gods Destroy"), and Sarpeidon. ("All Our Yesterdays") For the remastered episode, a new planet model was created by CGI artist Max Gabl.
According to the Star Trek: Star Charts (p. 65, "United Federation of Planets I", "United Federation of Planets II") and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Alpha Carinae II (Canopus II) was located in the Beta Quadrant. In 2378, Alpha Carinae II was listed as a Federation member.

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