Jupiter-sized brown dwarfs are found in the solar neighborhood with effective temperature T
eff as low as 250 K . Iron, silicates, chlorides and sulfides condense in the atmospheres of the T
eff ≈ 2000 K L-type and T
eff ≈ 1000 K T-type dwarfs . At the T-/Y-type boundary, T
eff ≈ 500 K and atmospheres are clear . The next species to condense are H2O at T
eff ≈ 350 K and NH3 at T
eff ≈ 200 K .