Kepler-1327 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1327 b is a confirmed super-earth exoplanet orbiting the star Kepler-1327, located approximately 2211.6 light-years (678.07 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0257% across the stellar disk), this world measures 1.8 Earth radii and has a measured mass of 3.89 Earth masses. Combining its mass and radius yields a mean bulk density of 3.68 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 16.4 km/s.

In its orbital architecture around Kepler-1327, Kepler-1327 b completes one full revolution every 14.888 Earth days at a semi-major axis of 0.11151 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 81.5 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 831 K (+558°C / +1036°F) and receiving 79.90 S⊕ (~108,744 W/m²), Kepler-1327 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1327 is classified as a stellar host with an effective photospheric temperature of 5,885 K, a radius of 1.03 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 1.142 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.07 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-1327 shines at apparent V-band magnitude 13.966 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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