Kepler-1893 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1893 b is a confirmed super-earth exoplanet orbiting the star Kepler-1893, located approximately 3427 light-years (1050.72 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0181% across the stellar disk), this world measures 1.706 Earth radii and has a measured mass of 3.55 Earth masses. Combining its mass and radius yields a mean bulk density of 3.94 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 16.1 km/s.

In its orbital architecture around Kepler-1893, Kepler-1893 b completes one full revolution every 4.179 Earth days at a semi-major axis of 0.0504 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 131.2 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 1194 K (+921°C / +1690°F) and receiving 478.98 S⊕ (~651,892 W/m²), Kepler-1893 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1893 is classified as a stellar host with an effective photospheric temperature of 5,633 K, a radius of 1.162 R☉, a mass of 0.973 M☉, an estimated bolometric luminosity of 1.22 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.9 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1893 shines at apparent V-band magnitude 15.152 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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