Kepler-907 b

Astrophysical Synthesis & Habitability Characterization

Kepler-907 b is a confirmed terrestrial exoplanet orbiting the star Kepler-907, located approximately 1148.1 light-years (352 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0064% across the stellar disk), this world measures 1.2 Earth radii and has a measured mass of 1.87 Earth masses. Combining its mass and radius yields a mean bulk density of 5.97 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 14 km/s.

In its orbital architecture around Kepler-907, Kepler-907 b completes one full revolution every 15.866 Earth days at a semi-major axis of 0.1225 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 84 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 879 K (+606°C / +1123°F) and receiving 137.66 S⊕ (~187,355 W/m²), Kepler-907 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-907 is classified as a stellar host with an effective photospheric temperature of 6,106 K, a radius of 1.38 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 2.375 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.37 Gyr and a metallicity of [Fe/H] = -0.15 dex (metal-poor relative to the Sun). From Earth, Kepler-907 shines at apparent V-band magnitude 11.16 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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