HD 175167 b
Astrophysical Synthesis & Habitability Characterization
HD 175167 b is a confirmed gas giant exoplanet orbiting the star HD 175167, located approximately 231.9 light-years (71.09 parsecs) from the Solar System. First announced in 2009 by Las Campanas Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.3 Earth radii (1.1 Jupiter radii) and has a measured mass of 4703.86 Earth masses (14.8 Jupiter masses). Combining its mass and radius yields a mean bulk density of 13.94 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 31.09 g⊕ (304.89 m/s²), and an escape velocity of 218.8 km/s.
In its orbital architecture around HD 175167, HD 175167 b completes one full revolution every 1175 Earth days (3.22Julian years) at a semi-major axis of 2.4 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 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 = 0.51, swinging from 1.176 AU at periapsis out to 3.624 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.300 R⊕, HD 175167 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 HD 175167 is classified as a solar-type yellow star of spectral type G5 IV/V with an effective photospheric temperature of 5,635 K, a radius of 1.75 R☉, a mass of 1.09 M☉, an estimated bolometric luminosity of 2.77 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.28 dex (metal-rich relative to the Sun). From Earth, HD 175167 shines at apparent V-band magnitude 8.01 (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: Las Campanas Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 175167 |
| Spectral Type | G5 IV/V |
| Effective Temp (Teff) | 5,635 K |
| Stellar Radius | 1.7500 R☉ |
| Stellar Mass | 1.0900 M☉ |
| Bolometric Luminosity | 2.77 L☉ |
| Metallicity [Fe/H] | 0.280 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 8.010 · G: 7.824 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.400000 AU |
| Orbital Period | 1175 days |
| Mean Orbital Velocity | 22.2 km/s |
| Orbital Eccentricity (e) | 0.51000 |
| Orbital Inclination (i) | 60.0000° |
| Mean Bulk Density | 13.94 g/cm³ (218.8 km/s vesc) |
| Insolation Flux | 0.4960 S⊕ (~675 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 231.900 LY (71.086 pc) |