Merak II was the inhabited second planet of its star system. The planet was a Federation member.
Plant life on this planet was the source of the oxygen in the atmosphere.
Prior to stardate 5818, Merak II was admitted to the Federation.
In that year, the planet experienced a bacterial botanical plague. The plague was treated with a toxic ore, known as zenite, which was acquired by the USS Enterprise. (TOS: "The Cloud Minders")
In 2370, Quark claimed that Elim Garak had ordered a sizing scanner from Merak II from the Ferengi. (DS9: "The Wire")
Background information Edit
According to the script for "The Wire", the pronunciation for Merak was "MARE-ak". However, according to StarTrek.com, the pronunciation for Merak was "MARE-ack".
According to StarTrek.com, the star Merak (Bayer designation Beta Ursae Majoris) has been known since antiquity on Earth. This star system was located about 78 light years from the Sol system. Merak II was a M-class planet.
According to the Star Trek: Star Charts (p. 47) and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Merak (Beta Ursae Majoris) was a binary system of two A-class stars in the Alpha Quadrant.