Kepler-1947 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1947 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1947, located approximately 1528.9 light-years (468.77 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.003% across the stellar disk), this world measures 1.01 Earth radii and has a measured mass of 1.01 Earth masses. Combining its mass and radius yields a mean bulk density of 5.41 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.99 g⊕ (9.71 m/s²), and an escape velocity of 11.2 km/s.

In its orbital architecture around Kepler-1947, Kepler-1947 b completes one full revolution every 6.964 Earth days at a semi-major axis of 0.07375 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 115.2 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1298 K (+1025°C / +1877°F) and receiving 229.40 S⊕ (~312,213 W/m²), Kepler-1947 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1947 is classified as a stellar host with an effective photospheric temperature of 6,040 K, a radius of 1.686 R☉, a mass of 0.984 M☉, an estimated bolometric luminosity of 3.394 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.98 Gyr and a metallicity of [Fe/H] = -0.44 dex (metal-poor relative to the Sun). From Earth, Kepler-1947 shines at apparent V-band magnitude 12.973 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

Discovery Facility: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).