BD+14 4559 b
Astrophysical Synthesis & Habitability Characterization
BD+14 4559 b is a confirmed gas giant exoplanet orbiting the star BD+14 4559, located approximately 161 light-years (49.35 parsecs) from the Solar System. First announced in 2009 by McDonald Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.8 Earth radii (1.23 Jupiter radii) and has a measured mass of 330.543 Earth masses (1.04 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.69 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.74 g⊕ (17.06 m/s²), and an escape velocity of 54.7 km/s.
In its orbital architecture around BD+14 4559, BD+14 4559 b completes one full revolution every 268.94 Earth days at a semi-major axis of 0.78 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 31.6 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.29, swinging from 0.5538 AU at periapsis out to 1.0062 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 13.800 R⊕, BD+14 4559 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star BD+14 4559 is classified as an orange K-type star of spectral type K2 V with an effective photospheric temperature of 4,864 K, a radius of 0.86 R☉, a mass of 0.49 M☉, an estimated bolometric luminosity of 0.371 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.17 dex (metal-rich relative to the Sun). From Earth, BD+14 4559 shines at apparent V-band magnitude 9.78 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: McDonald Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | BD+14 4559 |
| Spectral Type | K2 V |
| Effective Temp (Teff) | 4,864 K |
| Stellar Radius | 0.8600 R☉ |
| Stellar Mass | 0.4900 M☉ |
| Bolometric Luminosity | 0.371 L☉ |
| Metallicity [Fe/H] | 0.170 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.780 · G: 9.351 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.780000 AU |
| Orbital Period | 268.94 days |
| Mean Orbital Velocity | 31.6 km/s |
| Orbital Eccentricity (e) | 0.29000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.69 g/cm³ (54.7 km/s vesc) |
| Insolation Flux | 0.7867 S⊕ (~1,071 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 161.000 LY (49.352 pc) |