HD 110082 b
Astrophysical Synthesis & Habitability Characterization
HD 110082 b is a confirmed sub-neptune exoplanet orbiting the star HD 110082, located approximately 342.8 light-years (105.1 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0608% across the stellar disk), this world measures 3.2 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.3 Earth masses. Combining its mass and radius yields a mean bulk density of 1.73 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20.1 km/s.
In its orbital architecture around HD 110082, HD 110082 b completes one full revolution every 10.183 Earth days at a semi-major axis of 0.113 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 120.7 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.2 carries the world between 0.0904 AU at periapsis and 0.1356 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 957 K (+684°C / +1263°F) and receiving 198.39 S⊕ (~270,015 W/m²), HD 110082 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 110082 is classified as a warm F-type star of spectral type F8 V with an effective photospheric temperature of 6,200 K, a radius of 1.19 R☉, a mass of 1.21 M☉, an estimated bolometric luminosity of 1.877 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.25 Gyr and a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, HD 110082 shines at apparent V-band magnitude 9.23 (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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 110082 |
| Spectral Type | F8 V |
| Effective Temp (Teff) | 6,200 K |
| Stellar Radius | 1.1900 R☉ |
| Stellar Mass | 1.2100 M☉ |
| Bolometric Luminosity | 1.877 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | 0.250 Gyr |
| Apparent Magnitude | V: 9.230 · G: 9.115 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.113000 AU |
| Orbital Period | 10.183 days |
| Mean Orbital Velocity | 120.7 km/s |
| Orbital Eccentricity (e) | 0.20000 |
| Orbital Inclination (i) | 88.2000° |
| Mean Bulk Density | 1.73 g/cm³ (20.1 km/s vesc) |
| Insolation Flux | 198.3948 S⊕ (~270,015 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 342.800 LY (105.096 pc) |