PX282 - J1 - mercury
- heavy cratering, implying a geologically inactive ancient surface (
Gyr) - a high density and a weak magnetic field, implying the presence of a large iron core
- low albedo, similar to that of the moon, implying
K, with a very poor heat redistribution - slow rotation due to solar tides
- low obliquity, which is the tilt of the spin axis
- icy polar craters