Santri: Majestic colossal snowball
Santri is the outermost and the biggest known planet in the PE31H system. Enveloped by the wide pale stripes of icy rings, it is encircled by the three most massive moons in the whole system: Driffer, Istarius and Katti.
The PE31H star is too far away to warm up the planet's surface, so Santri's crust is covered with ice completely. But, the tidal forces generated by the enormous moons mentioned are strong enough to heat up the Santri's insides to create subsurface oceans of liquid water and ammonia.
Due to Santri's low rotation period, long-lived equatorial winds reaching speeds up to 300 kms/h stir up abundance of icy debris into the skies, causing a fog-like effect in the atmosphere.
Drop in for a royal visit and see the vast fields of ice with your own eyes...