HD 80883 b
Astrophysical Synthesis & Habitability Characterization
HD 80883 b is a confirmed gas giant exoplanet orbiting the star HD 80883, located approximately 112.9 light-years (34.6 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 12.8 Earth radii (1.14 Jupiter radii) and has a measured mass of 1748.056 Earth masses (5.5 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.6 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 10.67 g⊕ (104.64 m/s²), and an escape velocity of 130.7 km/s.
In its orbital architecture around HD 80883, HD 80883 b completes one full revolution every 6383.784 Earth days (17.48Julian years) at a semi-major axis of 6.462 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 11 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.203 carries the world between 5.1502 AU at periapsis and 7.7738 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 89 K (-184°C / -299°F) and an incident flux of 0.01 S⊕ (~14 W/m²), surface water and volatile species on HD 80883 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 80883 is classified as a stellar host with an effective photospheric temperature of 5,178 K, a radius of 0.8148 R☉, a mass of 0.88 M☉, an estimated bolometric luminosity of 0.428 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.264 dex (metal-poor relative to the Sun). From Earth, HD 80883 shines at apparent V-band magnitude 8.6 (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 80883 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,178 K |
| Stellar Radius | 0.8148 R☉ |
| Stellar Mass | 0.8800 M☉ |
| Bolometric Luminosity | 0.428 L☉ |
| Metallicity [Fe/H] | -0.264 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 8.600 · G: 8.362 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 6.462000 AU |
| Orbital Period | 6383.784 days |
| Mean Orbital Velocity | 11 km/s |
| Orbital Eccentricity (e) | 0.20300 |
| Orbital Inclination (i) | 141.3120° |
| Mean Bulk Density | 4.6 g/cm³ (130.7 km/s vesc) |
| Insolation Flux | 0.0103 S⊕ (~14 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 112.900 LY (34.601 pc) |