Kepler-1354 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1354 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1354, located approximately 3651.2 light-years (1119.45 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0482% across the stellar disk), this world measures 2.97 Earth radii and has a measured mass of 9.11 Earth masses. Combining its mass and radius yields a mean bulk density of 1.92 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.03 g⊕ (10.1 m/s²), and an escape velocity of 19.6 km/s.

In its orbital architecture around Kepler-1354, Kepler-1354 b completes one full revolution every 76.613 Earth days at a semi-major axis of 0.3521 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 50 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 466 K (+193°C / +379°F) and receiving 18.86 S⊕ (~25,668 W/m²), Kepler-1354 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1354 is classified as a stellar host with an effective photospheric temperature of 6,168 K, a radius of 1.24 R☉, a mass of 1.16 M☉, an estimated bolometric luminosity of 1.997 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.95 Gyr and a metallicity of [Fe/H] = 0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-1354 shines at apparent V-band magnitude 14.59 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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