HD 134060 b
Astrophysical Synthesis & Habitability Characterization
HD 134060 b is a confirmed sub-neptune exoplanet orbiting the star HD 134060, located approximately 78.3 light-years (24.01 parsecs) from the Solar System. First announced in 2019 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 3.16 Earth radii (0.28 Jupiter radii) and has a measured mass of 10.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.76 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20 km/s.
In its orbital architecture around HD 134060, HD 134060 b completes one full revolution every 3.27 Earth days at a semi-major axis of 0.0444 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 147.7 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.45, swinging from 0.0244 AU at periapsis out to 0.0644 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1473 K (+1200°C / +2192°F) and receiving 730.46 S⊕ (~994,156 W/m²), HD 134060 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 134060 is classified as a solar-type yellow star of spectral type G3 IV with an effective photospheric temperature of 5,966 K, a radius of 1.1643 R☉, a mass of 1.095 M☉, an estimated bolometric luminosity of 1.541 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.6 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, HD 134060 shines at apparent V-band magnitude 6.29 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 134060 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 134060 b sharing its stellar neighborhood alongside HD 134060 c.
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 | HD 134060 |
| Spectral Type | G3 IV |
| Effective Temp (Teff) | 5,966 K |
| Stellar Radius | 1.1643 R☉ |
| Stellar Mass | 1.0950 M☉ |
| Bolometric Luminosity | 1.541 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | 5.600 Gyr |
| Apparent Magnitude | V: 6.290 · G: 6.140 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.044400 AU |
| Orbital Period | 3.27 days |
| Mean Orbital Velocity | 147.7 km/s |
| Orbital Eccentricity (e) | 0.45000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.76 g/cm³ (20 km/s vesc) |
| Insolation Flux | 730.4602 S⊕ (~994,156 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 78.300 LY (24.013 pc) |