1RXS J160929.1-210524 b

1RXS J160929.1-210524 b, from the NASA Exoplanet Archive (found 2008). Measured: 3000 Earth masses, 330 AU, a 4060 K K-type star. Composition inferred from a mass of 3000 Earths, which is giant territory whatever its 0.47x density suggests, with an assumed 24-hour day — rotation cannot be measured for exoplanets. Note: TerraForge comes out at 12 K against the archive's 1700 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.