Kepler-1852 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1852 b is a confirmed super-earth exoplanet orbiting the star Kepler-1852, located approximately 2519.5 light-years (772.48 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0438% across the stellar disk), this world measures 1.886 Earth radii and has a measured mass of 4.22 Earth masses. Combining its mass and radius yields a mean bulk density of 3.47 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 16.7 km/s.

In its orbital architecture around Kepler-1852, Kepler-1852 b completes one full revolution every 7.971 Earth days at a semi-major axis of 0.0762 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 104 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 760 K (+487°C / +909°F) and receiving 79.10 S⊕ (~107,655 W/m²), Kepler-1852 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1852 is classified as a stellar host with an effective photospheric temperature of 5,237 K, a radius of 0.826 R☉, a mass of 0.927 M☉, an estimated bolometric luminosity of 0.46 L☉. Stellar evolution modeling indicates an estimated stellar age of 8.6 Gyr and a metallicity of [Fe/H] = 0.24 dex (metal-rich relative to the Sun). From Earth, Kepler-1852 shines at apparent V-band magnitude 15.726 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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