Kepler-1353 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1353 b is a confirmed super-earth exoplanet orbiting the star Kepler-1353, located approximately 1935.4 light-years (593.38 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0525% 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-1353, Kepler-1353 b completes one full revolution every 24.754 Earth days at a semi-major axis of 0.153 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 67.2 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 491 K (+218°C / +424°F) and receiving 10.77 S⊕ (~14,654 W/m²), Kepler-1353 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1353 is classified as a stellar host with an effective photospheric temperature of 4,776 K, a radius of 0.72 R☉, a mass of 0.76 M☉, an estimated bolometric luminosity of 0.242 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.68 Gyr and a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, Kepler-1353 shines at apparent V-band magnitude 15.734 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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