HD 151450 b
Astrophysical Synthesis & Habitability Characterization
HD 151450 b is a confirmed gas giant exoplanet orbiting the star HD 151450, located approximately 142.2 light-years (43.6 parsecs) from the Solar System. First announced in 2022 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 6.94 Earth radii (0.62 Jupiter radii) and has a measured mass of 38.457 Earth masses (0.12 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.63 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.8 g⊕ (7.85 m/s²), and an escape velocity of 26.3 km/s.
In its orbital architecture around HD 151450, HD 151450 b completes one full revolution every 21.893 Earth days at a semi-major axis of 0.16 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 79.5 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.496, swinging from 0.0806 AU at periapsis out to 0.2394 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 795 K (+522°C / +972°F) and receiving 66.56 S⊕ (~90,591 W/m²), HD 151450 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 151450 is classified as a stellar host with an effective photospheric temperature of 6,092 K, a radius of 1.1718 R☉, a mass of 1.14 M☉, an estimated bolometric luminosity of 1.697 L☉. From Earth, HD 151450 shines at apparent V-band magnitude 7.43 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 151450 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 151450 b sharing its stellar neighborhood alongside HD 151450 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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 151450 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,092 K |
| Stellar Radius | 1.1718 R☉ |
| Stellar Mass | 1.1400 M☉ |
| Bolometric Luminosity | 1.697 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 7.430 · G: 7.283 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.160000 AU |
| Orbital Period | 21.893 days |
| Mean Orbital Velocity | 79.5 km/s |
| Orbital Eccentricity (e) | 0.49600 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.63 g/cm³ (26.3 km/s vesc) |
| Insolation Flux | 66.5618 S⊕ (~90,591 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 142.200 LY (43.600 pc) |