One big scary piece of space rock
Katti doesn't have its' own atmosphere, so there is nothing to protect it from cosmic bombardments. Multiple impact craters are clearly visible on the surface. One of them, like a gargantuan scar, covers roughly one third of the moon's face. Katti owes its' brownish colour to range of metamorphic rocks, which subjected to substantial heat and pressure (yet another derivation of meteorite showers), displayed their variety of iron content.