HD 134606 f
Astrophysical Synthesis & Habitability Characterization
HD 134606 f is a confirmed sub-neptune exoplanet orbiting the star HD 134606, located approximately 87.4 light-years (26.79 parsecs) from the Solar System. First announced in 2024 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 2.24 Earth radii and has a measured mass of 5.63 Earth masses. Combining its mass and radius yields a mean bulk density of 2.76 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.12 g⊕ (10.98 m/s²), and an escape velocity of 17.7 km/s.
In its orbital architecture around HD 134606, HD 134606 f completes one full revolution every 26.915 Earth days at a semi-major axis of 0.1784 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 72.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.081 carries the world between 0.1639 AU at periapsis and 0.1929 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 685 K (+412°C / +774°F) and receiving 36.48 S⊕ (~49,648 W/m²), HD 134606 f orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 134606 is classified as a solar-type yellow star of spectral type G5IV with an effective photospheric temperature of 5,576 K, a radius of 1.158 R☉, a mass of 1.046 M☉, an estimated bolometric luminosity of 1.163 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.3 Gyr and a metallicity of [Fe/H] = 0.343 dex (metal-rich relative to the Sun). From Earth, HD 134606 shines at apparent V-band magnitude 6.86 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 134606 system is a multi-planet architecture hosting 5 confirmed worlds, with HD 134606 f sharing its stellar neighborhood alongside HD 134606 e, HD 134606 b, HD 134606 c, HD 134606 d.
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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 134606 |
| Spectral Type | G5IV |
| Effective Temp (Teff) | 5,576 K |
| Stellar Radius | 1.1580 R☉ |
| Stellar Mass | 1.0460 M☉ |
| Bolometric Luminosity | 1.163 L☉ |
| Metallicity [Fe/H] | 0.343 dex |
| Stellar Age | 7.300 Gyr |
| Apparent Magnitude | V: 6.860 · G: 6.678 |
| System Architecture | 1 Star, 5 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.178400 AU |
| Orbital Period | 26.915 days |
| Mean Orbital Velocity | 72.1 km/s |
| Orbital Eccentricity (e) | 0.08100 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.76 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | 36.4790 S⊕ (~49,648 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 87.400 LY (26.791 pc) |