About this world
HD 20794 b is a super-Earth orbiting HD 20794, a yellow, Sun-like star (type G6V) 19.6 light-years from Earth. It is about 1.4 times the size of Earth (its size estimated from its mass), with at least 2.7 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 18.3 days at 0.13 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 660 K (387 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", its star has probably stripped its atmosphere away, leaving bare rock.
It was discovered in 2011 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. HD 20794 has 4 known planets; the others are HD 20794 d, HD 20794 e and HD 20794 f.