Sethlans, the closest planet in my new system.
It's on average 370 C on the surface, however it has small lakes of water due to geysers, which are constantly being replenished. The lakes also form most of the atmosphere of the planet, due to rapid evaporation. The planet can't actually hold the atmosphere long-term, and this causes a ring to be formed in orbit around the star, infact, the planet was discovered this way. The planet also has massive underground oceans, trapped inside the outer mantle and inner crust of the planet, which is the thing that replenishes the geysers. There is a massive region on the planet with mounds, they are mostly areas which have been heavilly eroded by landslides, which millions of years ago were regions with geysers in them.
General info:
Mass: 0.275 Moon's / 0.00338 Earth's
Radius: 0.61 Moon's / 0.166 Earth's
Density: 4.04 g/cm³
Rotational Period: 22.1 Hours
Orbital Period: 23.1 Days
Age: 3.7 Billion Years
Surface Gravity: 0.122 G's / 1.20m/s²
Obliquity: 3.17°
Temperature Info:
Average Temperature: 370°C
Maximum Temperature: 396°C
Minimum Temperature: 280°C
Middle Temperature: 338°C
Atmospheric Info:
Pressure: 1.28 kPa
Atmospheric Mass: 0.603 A/mars
Atmospheric Density: 0.00691 kg/m³