HD 145934 b
Astrophysical Synthesis & Habitability Characterization
HD 145934 b is a confirmed gas giant exoplanet orbiting the star HD 145934, located approximately 743.2 light-years (227.88 parsecs) from the Solar System. First announced in 2015 by W. M. Keck Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.4 Earth radii (1.2 Jupiter radii) and has a measured mass of 658.54 Earth masses (2.07 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.51 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.67 g⊕ (35.99 m/s²), and an escape velocity of 78.4 km/s.
In its orbital architecture around HD 145934, HD 145934 b completes one full revolution every 2751.534 Earth days (7.53Julian years) at a semi-major axis of 4.89 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 19.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.078 carries the world between 4.5086 AU at periapsis and 5.2714 AU at apoapsis, driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 13.400 R⊕, HD 145934 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 145934 is classified as an orange K-type star of spectral type K0 with an effective photospheric temperature of 4,824 K, a radius of 6.9306 R☉, a mass of 2.058 M☉, an estimated bolometric luminosity of 23.338 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.56 Gyr and a metallicity of [Fe/H] = 0.095 dex (metal-rich relative to the Sun). From Earth, HD 145934 shines at apparent V-band magnitude 8.495 (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: W. M. Keck Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 145934 |
| Spectral Type | K0 |
| Effective Temp (Teff) | 4,824 K |
| Stellar Radius | 6.9306 R☉ |
| Stellar Mass | 2.0580 M☉ |
| Bolometric Luminosity | 23.338 L☉ |
| Metallicity [Fe/H] | 0.095 dex |
| Stellar Age | 1.560 Gyr |
| Apparent Magnitude | V: 8.495 · G: 8.241 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 4.890000 AU |
| Orbital Period | 2751.534 days |
| Mean Orbital Velocity | 19.3 km/s |
| Orbital Eccentricity (e) | 0.07800 |
| Orbital Inclination (i) | 81.9580° |
| Mean Bulk Density | 1.51 g/cm³ (78.4 km/s vesc) |
| Insolation Flux | 0.9461 S⊕ (~1,288 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 743.200 LY (227.881 pc) |