Theta VIII (or Theta Eight) was the uninhabited eighth planet of the Theta 116 system. This world had an orbital period of 832 days, and a rotational period of 15.3 hours. A K-class transjovian planet, the atmosphere of Theta 116 VIII was composed of nitrogen (57%), methane (23%), liquid neon (14%), yurium (2%), keimium compounds (2%), ethane (1%), and tormium (trace). The average surface temperature was −291°C, with wind speeds of up to 320 meters per second. Interesting weather phenomena included ammonia tornadoes. Its age was estimated at 7.2×1010 solar years, and during that time it had built up a mass of 4.35×1012.