Read some of the papers on our nearest known neighbor planet, Proxima Centauri b, and did some math.

The attached patchwork table shows the mass of PCb depending on its orbital inclination. Its mass(i) = 1.27 x Earth's mass, last I read. The table was from Excel with formulae to calculate data.

Taking 2 Earth masses as the transition point between terrestrial Earthlike worlds and mini-Neptunes, per:

PROBABILISTIC FORECASTING OF THE MASSES AND RADII OF OTHER WORLDS

Jingjing Chen, David Kipping

https://arxiv.org/pdf/1603.08614.pdf

... it appears there is just over a 55% chance PCb is terrestrial, so you can land on it and maybe colonize it, and just over a 44% chance it has an H/He envelope. If the latter holds but PCb is small enough, you might colonize it anyway with terraforming. Still would have a rocky surface under that gas.

To me, it looks too close to call whether another Earth or mini-Neptune. Another paper gives terrestrial odds as 84%.

ON THE ORBITAL INCLINATION OF PROXIMA CENTAURI b

Stephen R. Kane, Dawn M. Gelino, Margaret C. Turnbull

https://arxiv.org/pdf/1612.02872.pdf

Thoughts?