BD-17 63 b
Astrophysical Synthesis & Habitability Characterization
BD-17 63 b is a confirmed gas giant exoplanet orbiting the star BD-17 63, located approximately 112.4 light-years (34.46 parsecs) from the Solar System. First announced in 2008 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.8 Earth radii (1.14 Jupiter radii) and has a measured mass of 1639.995 Earth masses (5.16 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.31 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 10.01 g⊕ (98.16 m/s²), and an escape velocity of 126.6 km/s.
In its orbital architecture around BD-17 63, BD-17 63 b completes one full revolution every 655.57 Earth days (1.79Julian years) at a semi-major axis of 1.34 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 22.2 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.5439, swinging from 0.6112 AU at periapsis out to 2.0688 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 169 K (-104°C / -155°F) and an incident flux of 0.12 S⊕ (~159 W/m²), surface water and volatile species on BD-17 63 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star BD-17 63 is classified as an orange K-type star of spectral type K5 V with an effective photospheric temperature of 4,714 K, a radius of 0.74 R☉, a mass of 0.741 M☉, an estimated bolometric luminosity of 0.243 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.3 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, BD-17 63 shines at apparent V-band magnitude 9.62 (accessible to binoculars and small amateur telescopes) in the Southern 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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | BD-17 63 |
| Spectral Type | K5 V |
| Effective Temp (Teff) | 4,714 K |
| Stellar Radius | 0.7400 R☉ |
| Stellar Mass | 0.7410 M☉ |
| Bolometric Luminosity | 0.243 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 4.300 Gyr |
| Apparent Magnitude | V: 9.620 · G: 9.201 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 1.340000 AU |
| Orbital Period | 655.57 days |
| Mean Orbital Velocity | 22.2 km/s |
| Orbital Eccentricity (e) | 0.54390 |
| Orbital Inclination (i) | 80.0000° |
| Mean Bulk Density | 4.31 g/cm³ (126.6 km/s vesc) |
| Insolation Flux | 0.1169 S⊕ (~159 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 112.400 LY (34.460 pc) |