Kepler-1473 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1473 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1473, located approximately 2127.4 light-years (652.25 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.01% across the stellar disk), this world measures 1.19 Earth radii and has a measured mass of 1.81 Earth masses. Combining its mass and radius yields a mean bulk density of 5.92 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.28 g⊕ (12.55 m/s²), and an escape velocity of 13.8 km/s.

In its orbital architecture around Kepler-1473, Kepler-1473 b completes one full revolution every 14.427 Earth days at a semi-major axis of 0.11606 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 87.5 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 783 K (+510°C / +950°F) and receiving 111.01 S⊕ (~151,086 W/m²), Kepler-1473 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1473 is classified as a stellar host with an effective photospheric temperature of 6,046 K, a radius of 1.09 R☉, a mass of 1.09 M☉, an estimated bolometric luminosity of 1.424 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.63 Gyr and a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1473 shines at apparent V-band magnitude 13.486 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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