About this world
KOI-12 b is a gas giant orbiting KOI-12, a yellow-white F-type star 1.3 thousand light-years from Earth. It is about 1.2 times the size of Jupiter and holds 1.1 Jupiter masses. It completes an orbit every 17.9 days at 0.15 AU from its star, closer than Mercury is to the Sun, on a strongly elongated orbit (e = 0.34).
Its equilibrium temperature is about 911 K (638 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium. Its atmosphere has already been studied: 2 spectroscopic observations.
It was discovered in 2015 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction. KOI-12 has 2 known planets; the others are Kepler-448 c.