HD 221287 and Its Lone Known Planet

HD 221287 is a star 182 light-years away with one known planet. It is an F8 star, placing it in a temperature class hotter than the Sun's G type. Its reported mass is 1.2 solar masses and its reported radius is 1.12 solar radii, both larger than the corresponding values for the Sun, and its temperature is 6240 K, also hotter than the Sun's. Its age carries a reported upper limit of 1 billion years.

The single known planet is HD 221287 b, discovered in 2007 by the radial velocity method. That technique detects the wobble a planet's gravity induces in its star's motion, and repeated wobbles reveal the planet and its orbital period. The planet's minimum mass is 982 Earth masses, a lower bound on its true mass that is larger than Earth's and roughly 3.09 times Jupiter's mass. It completes one orbit every 456 days.