HD 112300 b
Astrophysical Synthesis & Habitability Characterization
HD 112300 b is a confirmed gas giant exoplanet orbiting the star HD 112300, located approximately 202.5 light-years (62.07 parsecs) from the Solar System. First announced in 2023 by Bohyunsan Optical Astronomical Observatory 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 5031.224 Earth masses (15.83 Jupiter masses). Combining its mass and radius yields a mean bulk density of 15.28 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 33.8 g⊕ (331.46 m/s²), and an escape velocity of 227.2 km/s.
In its orbital architecture around HD 112300, HD 112300 b completes one full revolution every 466.63 Earth days (1.28Julian years) at a semi-major axis of 1.33 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 31 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.36, swinging from 0.8512 AU at periapsis out to 1.8088 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1240 K (+967°C / +1773°F) and receiving 284.13 S⊕ (~386,695 W/m²), HD 112300 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 112300 is classified as a low-mass red dwarf of spectral type M1 III with an effective photospheric temperature of 3,657 K, a radius of 65.8 R☉, a mass of 1.4 M☉, an estimated bolometric luminosity of 694.771 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, HD 112300 shines at apparent V-band magnitude 3.395 (visible to the unaided human eye under dark skies) 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: Bohyunsan Optical Astronomical Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 112300 |
| Spectral Type | M1 III |
| Effective Temp (Teff) | 3,657 K |
| Stellar Radius | 65.8000 R☉ |
| Stellar Mass | 1.4000 M☉ |
| Bolometric Luminosity | 694.771 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 3.395 · G: 2.364 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 1.330000 AU |
| Orbital Period | 466.63 days |
| Mean Orbital Velocity | 31 km/s |
| Orbital Eccentricity (e) | 0.36000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 15.28 g/cm³ (227.2 km/s vesc) |
| Insolation Flux | 284.1257 S⊕ (~386,695 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 202.500 LY (62.073 pc) |