Kepler-1752 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1752 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1752, located approximately 3140.5 light-years (962.89 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.2571% across the stellar disk), this world measures 4.541 Earth radii (0.41 Jupiter radii) and has a measured mass of 18.7 Earth masses. Combining its mass and radius yields a mean bulk density of 1.1 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.91 g⊕ (8.92 m/s²), and an escape velocity of 22.7 km/s.

In its orbital architecture around Kepler-1752, Kepler-1752 b completes one full revolution every 56.359 Earth days at a semi-major axis of 0.2698 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 52.1 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 419 K (+146°C / +295°F) and receiving 7.29 S⊕ (~9,922 W/m²), Kepler-1752 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1752 is classified as a stellar host with an effective photospheric temperature of 5,446 K, a radius of 0.821 R☉, a mass of 0.824 M☉, an estimated bolometric luminosity of 0.532 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.2 Gyr and a metallicity of [Fe/H] = -0.2 dex (metal-poor relative to the Sun). From Earth, Kepler-1752 shines at apparent V-band magnitude 16.025 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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