As an iceball world, Algidos has a surface of chemical ices and a very cold temperature.
Algidos has a radius of around 5,109 kilometers, and a density of around 4.9 g.cm^3, making it have far less gravity than earth. It's density is a result of its very small core, and the presence of multiple light carbonates in the crust.
Algidos takes 41 hours to rotate on its axis. This is probably due to a large asteroid hitting it at an angle, therefore slowing its rotation down. Its years last 98 earth years, so its class K3 star has little influence, and the surface is extremely dark. The axial tilt reaches -39 degrees, so it has large seasonal variation.
The surface of Algidos is completely covered in ices, but this does variate with different craters caused by asteroids. Its atmosphere has completely frozen into ices like granite-hard water ice, and some solid nitrogen has been seen. However, elements with a lower freezing point than nitrogen have not been found.
The average temperature on the surface is around -239 degrees celcius, as there are no radiation-producing bodies by it.
Algidos has two moons, Aratum and Luxuus. Aratum is the larger one, and it sees very little activity. It is around 1/6 of Algidios' size, and appears to be created from a large-scale impact after the protoplanetary disk settled, ejecting some of the crust and mantle into space. Thin rings are evident from this.
Luxuus is a mining colony, as large amounts of carbon, uranium, and some platinum group members have been found. There is a large space station orbiting this moon is known as The Asphodel.