BD+05 4868 A b

Astrophysical Synthesis & Habitability Characterization

BD+05 4868 A b is a confirmed super-earth exoplanet orbiting the star BD+05 4868 A, located approximately 142.1 light-years (43.57 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique, this world has a minimum or true mass of 6.2 Earth masses, while its physical transit radius has not yet been geometrically observed.

In its orbital architecture around BD+05 4868 A, BD+05 4868 A b completes one full revolution every 1.272 Earth days at a semi-major axis of 0.0208 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 177.9 km/s (compared to Earth's 29.8 km/s).

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1820 K (+1547°C / +2817°F) and receiving 443.79 S⊕ (~603,994 W/m²), BD+05 4868 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star BD+05 4868 A is classified as an orange K-type star of spectral type K V with an effective photospheric temperature of 4,596 K, a radius of 0.69 R☉, a mass of 0.7 M☉, an estimated bolometric luminosity of 0.191 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.1 Gyr and a metallicity of [Fe/H] = -0.05 dex (near-solar heavy-element abundance). From Earth, BD+05 4868 A shines at apparent V-band magnitude 10.158 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).