HD 28192 b
Astrophysical Synthesis & Habitability Characterization
HD 28192 b is a confirmed gas giant exoplanet orbiting the star HD 28192, located approximately 162.4 light-years (49.81 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 12.2 Earth radii (1.09 Jupiter radii) and has a measured mass of 99.798 Earth masses (0.31 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.3 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.67 g⊕ (6.57 m/s²), and an escape velocity of 32 km/s.
In its orbital architecture around HD 28192, HD 28192 b completes one full revolution every 14.233 Earth days at a semi-major axis of 0.118 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 90.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.104 carries the world between 0.1057 AU at periapsis and 0.1303 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 860 K (+587°C / +1089°F) and receiving 91.14 S⊕ (~124,041 W/m²), HD 28192 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 28192 is classified as a stellar host with an effective photospheric temperature of 5,920 K, a radius of 1.0709 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 1.264 L☉. From Earth, HD 28192 shines at apparent V-band magnitude 8.06 (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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 28192 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,920 K |
| Stellar Radius | 1.0709 R☉ |
| Stellar Mass | 1.0800 M☉ |
| Bolometric Luminosity | 1.264 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 8.060 · G: 7.899 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.118000 AU |
| Orbital Period | 14.233 days |
| Mean Orbital Velocity | 90.2 km/s |
| Orbital Eccentricity (e) | 0.10400 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.3 g/cm³ (32 km/s vesc) |
| Insolation Flux | 91.1399 S⊕ (~124,041 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 162.400 LY (49.806 pc) |