Kepler-1347 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1347 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1347, located approximately 1047 light-years (321 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0143% across the stellar disk), this world measures 1.03 Earth radii and has a measured mass of 1.08 Earth masses. Combining its mass and radius yields a mean bulk density of 5.45 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.02 g⊕ (10 m/s²), and an escape velocity of 11.5 km/s.

In its orbital architecture around Kepler-1347, Kepler-1347 b completes one full revolution every 14.009 Earth days at a semi-major axis of 0.104 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 80.8 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 617 K (+344°C / +651°F) and receiving 34.32 S⊕ (~46,710 W/m²), Kepler-1347 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1347 is classified as a stellar host with an effective photospheric temperature of 5,193 K, a radius of 0.79 R☉, a mass of 0.82 M☉, an estimated bolometric luminosity of 0.407 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.62 Gyr and a metallicity of [Fe/H] = -0.11 dex (metal-poor relative to the Sun). From Earth, Kepler-1347 shines at apparent V-band magnitude 13.557 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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