CT Cha b

CT Cha b, from the NASA Exoplanet Archive (found 2007). Measured: 5400 Earth masses, 440 AU, a 4403 K K-type star. Composition inferred from a mass of 5400 Earths, which is giant territory whatever its 0.36x density suggests, with an assumed 24-hour day — rotation cannot be measured for exoplanets. Note: TerraForge comes out at 976 K against the archive's 2600 K, because that figure is the planet's own heat, not the star's. It receives almost no sunlight out at this distance and is still glowing from its formation — TerraForge only warms worlds with starlight, so it has no way to model a planet heated from within.