HD 93083 b
Astrophysical Synthesis & Habitability Characterization
HD 93083 b is a confirmed gas giant exoplanet orbiting the star HD 93083, located approximately 93 light-years (28.52 parsecs) from the Solar System. First announced in 2005 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 14.3 Earth radii (1.28 Jupiter radii) and has a measured mass of 143.341 Earth masses (0.45 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.7 g⊕ (6.86 m/s²), and an escape velocity of 35.4 km/s.
In its orbital architecture around HD 93083, HD 93083 b completes one full revolution every 144.72 Earth days at a semi-major axis of 0.508 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 38.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.118 carries the world between 0.4481 AU at periapsis and 0.5679 AU at apoapsis, driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 14.300 R⊕, HD 93083 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star HD 93083 is classified as an orange K-type star of spectral type K2 IV-V with an effective photospheric temperature of 5,034 K, a radius of 0.837 R☉, a mass of 0.836 M☉, an estimated bolometric luminosity of 0.404 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.71 Gyr and a metallicity of [Fe/H] = 0.13 dex (metal-rich relative to the Sun). From Earth, HD 93083 shines at apparent V-band magnitude 8.3 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 93083 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 93083 b sharing its stellar neighborhood alongside GJ 1137 c.
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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 93083 |
| Spectral Type | K2 IV-V |
| Effective Temp (Teff) | 5,034 K |
| Stellar Radius | 0.8370 R☉ |
| Stellar Mass | 0.8360 M☉ |
| Bolometric Luminosity | 0.404 L☉ |
| Metallicity [Fe/H] | 0.130 dex |
| Stellar Age | 10.710 Gyr |
| Apparent Magnitude | V: 8.300 · G: 8.042 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.508000 AU |
| Orbital Period | 144.72 days |
| Mean Orbital Velocity | 38.2 km/s |
| Orbital Eccentricity (e) | 0.11800 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.27 g/cm³ (35.4 km/s vesc) |
| Insolation Flux | 1.5900 S⊕ (~2,164 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 93.000 LY (28.516 pc) |