This is a massive gas giant, being about 160,000 kilometers in diameter around the equator. With an axial inclination of three degrees and a sidereal orbital period of over thirty-seven years, it spends a great deal of time on its lonely orbital path far from any of the other planets. It largely consists of tibanna gas, though a good percentage is hydrogen and helium, along with other trace gases that have some industrial uses.

Violent ionic storms wrack its atmosphere almost constantly and the weather patterns are all too erratic and unpredictable. Various survey teams have scanned the planet, though sensor readings are very unreliable the deeper into the atmosphere you go, with visibility also reduced to a couple of hundred meters at best. To date, however, no life forms have ever been discovered on Horos IV.