Tags: Planet.
HR 8799 d is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 5 and 10 Jupiter masses and a radius from 20 to 30% larger than Jupiter’s. The planet orbits at 24 AU from HR 8799 with an eccentricity greater than 0.04 and a period of 100 years.
