HD 209458 b
HD 209458 b is an exoplanet. It orbits HD 209458 in the constellation Pegasus. It is approximately 159 light years from the Solar System. A year on HD 209458 b is 3.5 Earth days. It has an estimated surface temperature of about 1,000 °C (about 1,800 °F). Its mass is 220 times that of Earth.