Elysium was a Class M world that hosted a Federation colony in the early 23rd century. It was named for the Elysian Fields of Earth's Greek mythology. Much as Earth, it orbited a G-type star and was the third planet from its sun.
In 2231, a large wildfire swept across the colony, killing numerous colonists, including Prescott and McKinnies. Christopher survived and was taken back to Earth by his biological father, Charlie Pike.