HD 80913 b
Astrophysical Synthesis & Habitability Characterization
HD 80913 b is a confirmed gas giant exoplanet orbiting the star HD 80913, located approximately 200.1 light-years (61.36 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 Earth radii (1.07 Jupiter radii) and has a measured mass of 7505.2 Earth masses (23.61 Jupiter masses). Combining its mass and radius yields a mean bulk density of 23.95 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 52.12 g⊕ (511.12 m/s²), and an escape velocity of 279.7 km/s.
In its orbital architecture around HD 80913, HD 80913 b completes one full revolution every 10839.833 Earth days (29.68Julian years) at a semi-major axis of 9.95 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 10 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.313, swinging from 6.8357 AU at periapsis out to 13.0644 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 118 K (-155°C / -247°F) and an incident flux of 0.03 S⊕ (~44 W/m²), surface water and volatile species on HD 80913 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 80913 is classified as a stellar host with an effective photospheric temperature of 6,013 K, a radius of 1.6542 R☉, a mass of 1.11 M☉, an estimated bolometric luminosity of 3.209 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.68 dex (metal-poor relative to the Sun). From Earth, HD 80913 shines at apparent V-band magnitude 7.49 (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 80913 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,013 K |
| Stellar Radius | 1.6542 R☉ |
| Stellar Mass | 1.1100 M☉ |
| Bolometric Luminosity | 3.209 L☉ |
| Metallicity [Fe/H] | -0.680 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.490 · G: 7.336 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 9.950000 AU |
| Orbital Period | 10839.833 days |
| Mean Orbital Velocity | 10 km/s |
| Orbital Eccentricity (e) | 0.31300 |
| Orbital Inclination (i) | 22.3310° |
| Mean Bulk Density | 23.95 g/cm³ (279.7 km/s vesc) |
| Insolation Flux | 0.0326 S⊕ (~44 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 200.100 LY (61.360 pc) |