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Alpha Carinae II was the inhabited second planet in the Canopus system of the Beta Quadrant. Classified as class M, the planet was inhabited by sentient indigenous lifeforms. (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 land masses and a number of islands. There were at least twenty-nine other planets that were biologically similar to Alpha Carinae II known to the Federation.

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, shortly after departing Starbase 6, 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")


Background information

This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the Star Trek: Discovery episode "An Obol for Charon".

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 in "A Private Little War", Triskelion in "The Gamesters of Triskelion", the Kelvan planet in "By Any Other Name", Ekos in "Patterns of Force", Triacus in "And the Children Shall Lead", an unnamed planet in "Is There in Truth No Beauty?", the Medusan homeworld in "Is There in Truth No Beauty?", Beta XII-A in "Day of the Dove", the Kalandan outpost in "That Which Survives", Elba II in "Whom Gods Destroy"), and Sarpeidon in "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 ( "United Federation of Planets I"), Alpha Carinae II was listed as a Federation member in 2378.

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