Kepler-1749 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1749 b is a confirmed super-earth exoplanet orbiting the star Kepler-1749, located approximately 874.8 light-years (268.2 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0715% across the stellar disk), this world measures 1.613 Earth radii and has a measured mass of 3.23 Earth masses. Combining its mass and radius yields a mean bulk density of 4.24 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 15.8 km/s.

In its orbital architecture around Kepler-1749, Kepler-1749 b completes one full revolution every 14.534 Earth days at a semi-major axis of 0.0956 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 71.6 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 420 K (+147°C / +297°F) and receiving 7.34 S⊕ (~9,990 W/m²), Kepler-1749 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1749 is classified as a stellar host with an effective photospheric temperature of 3,957 K, a radius of 0.553 R☉, a mass of 0.551 M☉, an estimated bolometric luminosity of 0.067 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.72 Gyr and a metallicity of [Fe/H] = -0.16 dex (metal-poor relative to the Sun). From Earth, Kepler-1749 shines at apparent V-band magnitude 14.95 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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