|Affiliation:||Contested between the United Federation of Planets and the Klingon Empire (2267)|
Located close to the Klingon-Federation border, Capella IV was the fourth planet of the Capellan system in the Alpha Quadrant. It was the homeworld of the Capellans, a pre-warp capable humanoid species, as well as the Capellan flower and the Capellan power-cat.
In the mid-23rd century, Capella IV was valued by both the Federation and the Klingons for its rich deposits of topaline. (TOS: "Friday's Child"; TAS: "How Sharper Than a Serpent's Tooth", "The Counter-Clock Incident"; Star Trek VI: The Undiscovered Country, production art)
In 2267, the planet served as a pawn in the Federation-Klingon Cold War, during a trade dispute between the Klingons and the Federation over topaline mining rights. The crew of the USS Enterprise was able to secure the rights for the Federation. (TOS: "Friday's Child")
Capella IV was given a "face lift" for the 2006 remastered version of "Friday's Child", with a digital planet replacing the stock footage from the classic episode.
According to The Worlds of the Federation, the Capellans refer to their world as Kohath.
"The Explored Galaxy"
"The Explored Galaxy" was a map of charted space in the Alpha Quadrant. Capella was located between the Tholian Assembly and Romulus. Both locations were identified in DS9: "The Search, Part II", "Call to Arms" as being located in this quadrant. The chart, first seen chronologically in Star Trek VI: The Undiscovered Country, was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370. These were TNG: "Conspiracy", "The Measure Of A Man", "The Emissary", "The Mind's Eye", "The Game", and DS9: "In the Hands of the Prophets", "Cardassians".
Capella IV (Alpha Aurigae IV): This planet was located in or near Federation space. Capella IV was ruled by the Ten Tribes of Capella, and was established as a protectorate of the Federation in 2267. The dominant species were the humanoid Capelians. In 2378, there were an estimated 160,000 Capellans living on the planet. A major attraction of the planet was the tomb of Leonard James Akaar. (pgs. 33, 37, & 47)