Kepler-1924 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1924 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1924, located approximately 6232.1 light-years (1910.77 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0359% across the stellar disk), this world measures 2.654 Earth radii and has a measured mass of 7.53 Earth masses. Combining its mass and radius yields a mean bulk density of 2.22 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.07 g⊕ (10.49 m/s²), and an escape velocity of 18.8 km/s.

In its orbital architecture around Kepler-1924, Kepler-1924 b completes one full revolution every 15.332 Earth days at a semi-major axis of 0.1216 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 86.3 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 821 K (+548°C / +1018°F) and receiving 107.44 S⊕ (~146,226 W/m²), Kepler-1924 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1924 is classified as a stellar host with an effective photospheric temperature of 5,726 K, a radius of 1.285 R☉, a mass of 1.018 M☉, an estimated bolometric luminosity of 1.593 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1924 shines at apparent V-band magnitude 15.084 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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