Ross 128 is a star with 0.17 times the mass of the Sun, and 0.2 times its radius. It is located 11.01 light years away from the solar system and is estimated to be 5 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
Ross 128 is known to have 1 exoplanets in orbit around it.
Ross 128 b was discovered by the La Silla Observatory observatory, in 2018-05, using the radial velocity method. Its semi-major axis is 0.05 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of Ross 128 b is 1.399 times the mass of Earth. The radius of Ross 128 b is 1.110 that of Earth. At less than 1.5 Earth masses, Ross 128 b is a regular terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.