HD 11112 b
Astrophysical Synthesis & Habitability Characterization
HD 11112 b is a confirmed gas giant exoplanet orbiting the star HD 11112, located approximately 144.7 light-years (44.38 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 12.6 Earth radii (1.12 Jupiter radii) and has a measured mass of 2598.565 Earth masses (8.18 Jupiter masses). Combining its mass and radius yields a mean bulk density of 7.16 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 16.37 g⊕ (160.53 m/s²), and an escape velocity of 160.6 km/s.
In its orbital architecture around HD 11112, HD 11112 b completes one full revolution every 17244.908 Earth days (47.21Julian years) at a semi-major axis of 13.38 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 8.4 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.285, swinging from 9.5667 AU at periapsis out to 17.1933 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 95 K (-178°C / -288°F) and an incident flux of 0.01 S⊕ (~18 W/m²), surface water and volatile species on HD 11112 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 11112 is classified as a stellar host with an effective photospheric temperature of 5,906 K, a radius of 1.4737 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 2.371 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.187 dex (metal-rich relative to the Sun). From Earth, HD 11112 shines at apparent V-band magnitude 7.13 (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 11112 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,906 K |
| Stellar Radius | 1.4737 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 2.371 L☉ |
| Metallicity [Fe/H] | 0.187 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.130 · G: 6.967 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 13.380000 AU |
| Orbital Period | 17244.908 days |
| Mean Orbital Velocity | 8.4 km/s |
| Orbital Eccentricity (e) | 0.28500 |
| Orbital Inclination (i) | 144.8760° |
| Mean Bulk Density | 7.16 g/cm³ (160.6 km/s vesc) |
| Insolation Flux | 0.0133 S⊕ (~18 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 144.700 LY (44.380 pc) |