Second Most Earth-Like Planet to Date Found

[radtech497]

By itself, 2Gs isn't that bad compared to 900F at 90 bars. But if Kepler 452b has gone into a runaway greenhouse...yeah. Less so than Venus.

According to this paper, Kepler 452b has a radius 1.63 times that of Earth (10,396.303 km) and a mass between 3.0 and 7.0 times that of Earth (1.792e+25 to 4.182e+25 kg), giving a bulk density between 3807.431 and 8884.005 kg/m^3 (indicating a solid, rocky planet). At the low end of the mass scale, Kepler 452b has a mean surface gravity of 1.128 g, while at the high end, it is 2.633 g.

Kepler 452, the planet's host star, is 1.037 times as massive as Sol, has a radius 1.11 times that of Sol, and has an effective temperature of 5757 Kelvin; this gives a luminosity 1.216 times Sol's.

Kepler 452b orbits Kepler 452 at a semi-major axis of 1.046 AU, with an orbital eccentricity of 0.03, once every 384.843 days. At this distance, the planet receives 11.128% more insolation than does Earth. With an equilibrium temperature of 260.821 Kelvin (assuming an Earth-like albedo of 0.306) and, if an Earth-like amount of atmospheric radiative forcing is assumed, a mean surface temperature of 294.945 Kelvin, then the planet is eminently habitable and has been for most of its six billion year history.

Radtech497