About this world
HD 43197 b is a gas giant orbiting HD 43197, a yellow, Sun-like star (type G8V) 204 light-years from Earth. It is about 1.3 times the size of Jupiter (its size estimated from its mass), with at least 0.55 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 309 days at 0.88 AU from its star, on a strongly elongated orbit (e = 0.74).
Its equilibrium temperature is about 283 K (10 °C), which places it in the conservative habitable zone: the band where liquid water could exist on a rocky surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2010 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. HD 43197 has 2 known planets; the others are HD 43197 c.