Chimera has a incredibly high gravity, high enough that it can crush a normal Human in seconds. The colony was founded by a Capecchi group of settlers, the Korrigan, who genetically modified their bodies to be strong enough to survive the intense gravity.
The planet formerly was an Earth Federation colony that broke away during the Sol Gamma Wave in 2601. It later was conquered by the Republic during the Annexation of the Western Territories in 2743, the Republic's annexation of the 27 independent colony worlds that dominated the space to its galactic west.
The planet rebelled during the Lovejoy Revolution and broke away in May 3073 during the Cessation of the Western Territories. It allied with the other rebelling worlds, forming the Western Confederation of Independent Worlds.
The planet was named after Mount Chimaera, a place in ancient Lycia, notable for volcanic phenomena and said by some ancient sources to be the origin of the myth of the Chimera.