Kepler-1451 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1451 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1451, located approximately 3453.1 light-years (1058.72 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0962% across the stellar disk), this world measures 3.35 Earth radii (0.3 Jupiter radii) and has a measured mass of 11.2 Earth masses. Combining its mass and radius yields a mean bulk density of 1.64 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1 g⊕ (9.81 m/s²), and an escape velocity of 20.5 km/s.

In its orbital architecture around Kepler-1451, Kepler-1451 b completes one full revolution every 35.622 Earth days at a semi-major axis of 0.2101 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 64.2 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 523 K (+250°C / +482°F) and receiving 18.75 S⊕ (~25,520 W/m²), Kepler-1451 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1451 is classified as a stellar host with an effective photospheric temperature of 5,782 K, a radius of 0.99 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 0.983 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.17 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1451 shines at apparent V-band magnitude 15.313 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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