GJ 436 b: 22.1 Earth Masses
Ice giant around GJ 436
It is 4.17 times Earth's radius, closest in size to Uranus, and 22.1 times Earth's mass, at 1.80 g/cm3, less dense than Earth. A year there lasts 2.64 days, on an orbit 13 times closer to its star than Mercury is to the Sun.
Radius
4.17 Earth radii
Mass
22.1 Earth masses
One year
2.64 days
Orbit radius
0.0291 AU
Distance
32 light-years
What the star's motion reveals
The pull of the planet on its star, which is a lower bound on its mass.
This planet was found by the wobble it induces in its star, which measures mass rather than size. A radius quoted for such a planet usually comes from a later transit or from a model.
Found by W. M. Keck Observatory in 2004.
