Makemake(minor-planet designation136472 Makemake) is adwarf planetand perhaps the largestKuiper beltobject (KBO) in theclassical population,with a diameter that is about 2/3 the size ofPluto. Makemake has no known satellites, which makes it unique among the largest KBOs and means that its mass can only be estimated. Its extremely low average temperature, about 30 K(−243.2 °C), means its surface is covered withmethane,ethane, and possiblynitrogenices.