HD 150706 b
Astrophysical Synthesis & Habitability Characterization
HD 150706 b is a confirmed gas giant exoplanet orbiting the star HD 150706, located approximately 92.2 light-years (28.27 parsecs) from the Solar System. First announced in 2012 by Haute-Provence Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.3 Earth radii (1.19 Jupiter radii) and has a measured mass of 772.323 Earth masses (2.43 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.81 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 4.37 g⊕ (42.86 m/s²), and an escape velocity of 85.2 km/s.
In its orbital architecture around HD 150706, HD 150706 b completes one full revolution every 5894 Earth days (16.14Julian years) at a semi-major axis of 6.7 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 12.4 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.38, swinging from 4.154 AU at periapsis out to 9.246 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 109 K (-164°C / -263°F) and an incident flux of 0.02 S⊕ (~33 W/m²), surface water and volatile species on HD 150706 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 150706 is classified as a solar-type yellow star of spectral type G0 V with an effective photospheric temperature of 5,961 K, a radius of 0.96 R☉, a mass of 1.17 M☉, an estimated bolometric luminosity of 1.044 L☉. Stellar evolution modeling indicates an estimated stellar age of 3 Gyr and a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, HD 150706 shines at apparent V-band magnitude 7.03 (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: Haute-Provence Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 150706 |
| Spectral Type | G0 V |
| Effective Temp (Teff) | 5,961 K |
| Stellar Radius | 0.9600 R☉ |
| Stellar Mass | 1.1700 M☉ |
| Bolometric Luminosity | 1.044 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | 3.000 Gyr |
| Apparent Magnitude | V: 7.030 · G: 6.850 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 6.700000 AU |
| Orbital Period | 5894 days |
| Mean Orbital Velocity | 12.4 km/s |
| Orbital Eccentricity (e) | 0.38000 |
| Orbital Inclination (i) | 70.0000° |
| Mean Bulk Density | 1.81 g/cm³ (85.2 km/s vesc) |
| Insolation Flux | 0.0240 S⊕ (~33 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 92.200 LY (28.270 pc) |