BD-06 1339 b

Astrophysical Synthesis & Habitability Characterization

BD-06 1339 b is a confirmed gas giant exoplanet orbiting the star BD-06 1339, located approximately 66.1 light-years (20.27 parsecs) from the Solar System. First announced in 2013 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world has a minimum or true mass of 1523.034 Earth masses (4.79 M♃), while its physical transit radius has not yet been geometrically observed.

In its orbital architecture around BD-06 1339, BD-06 1339 b completes one full revolution every 3.873 Earth days at a semi-major axis of 0.0428 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 120.2 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 835 K (+562°C / +1044°F) and receiving 51.89 S⊕ (~70,627 W/m²), BD-06 1339 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star BD-06 1339 is classified as an orange K-type star of spectral type K7/M0 V with an effective photospheric temperature of 4,324 K, a radius of 0.6864 R☉, a mass of 0.7 M☉, an estimated bolometric luminosity of 0.148 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.4 Gyr and a metallicity of [Fe/H] = -0.14 dex (metal-poor relative to the Sun). From Earth, BD-06 1339 shines at apparent V-band magnitude 9.7 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The BD-06 1339 system is a multi-planet architecture hosting 2 confirmed worlds, with BD-06 1339 b sharing its stellar neighborhood alongside BD-06 1339 c.

Discovery Facility: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).