About this world
TOI-756 c is a gas giant orbiting TOI-756, a cool red dwarf (type M1V) 281 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass), with at least 4.1 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 149 days at 0.44 AU from its star, on a strongly elongated orbit (e = 0.45).
Its equilibrium temperature is about 194 K (−79 °C), which places it in the optimistic 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 2025 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. TOI-756 has 2 known planets; the others are TOI-756 b.