Beta XII-A
Beta XII-A was the uninhabited twelfth planet in the Beta Leonis Minoris system of the Alpha Quadrant. This planet was located near the Federation-Klingon border.

In 2256, this planet was mentioned with the star Beta Leonis Minoris's name on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the . ()

In 2268, the crew of the  answered a distress call from a colony. There were a hundred men, women, and children in this colony. According to the distress call, they were under attack by an unidentified starship. When a Klingon battle cruiser was detected approaching this planet, Captain James T. Kirk assumed that the Klingons were responsible for the attack. The Klingons steadfastly denied any involvement in the destruction of the colony. 

The incident was later determined to be a fabrication created by an entity to incite a feud between the crews of the Enterprise and the Klingon battle cruiser. ()

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Beta 12-A