Merbel

Merbel is the only known moon of Glumo.

Surface and atmosphere

It is frozen over with ice and possesses an atmosphere and liquid oceans of potentially water.

merbel in the trailer

Merbel was featured heavily in the announcement trailer for KSP 2 where a colony is featured on the moon, according to the trailer Merbel orbits incredibly close to Glumo within the rings, however this could change when early access is released

announcement trailer screenshot showing Merbel orbiting Glumo

announcement trailer Screenshot showing Merbels surface (Not real gameplay)

It will be in KSP 2.