HD 32963 b
Astrophysical Synthesis & Habitability Characterization
HD 32963 b is a confirmed gas giant exoplanet orbiting the star HD 32963, located approximately 124.2 light-years (38.08 parsecs) from the Solar System. First announced in 2015 by W. M. Keck Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.4 Earth radii (1.2 Jupiter radii) and has a measured mass of 657.905 Earth masses (2.07 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.51 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.66 g⊕ (35.89 m/s²), and an escape velocity of 78.4 km/s.
In its orbital architecture around HD 32963, HD 32963 b completes one full revolution every 2372 Earth days (6.49Julian years) at a semi-major axis of 3.41 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 15.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.07 carries the world between 3.1713 AU at periapsis and 3.6487 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 158 K (-115°C / -175°F) and an incident flux of 0.10 S⊕ (~136 W/m²), surface water and volatile species on HD 32963 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 32963 is classified as a solar-type yellow star of spectral type G5 IV with an effective photospheric temperature of 5,727 K, a radius of 1.111 R☉, a mass of 0.94 M☉, an estimated bolometric luminosity of 1.191 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.99 Gyr and a metallicity of [Fe/H] = 0.11 dex (metal-rich relative to the Sun). From Earth, HD 32963 shines at apparent V-band magnitude 7.6 (accessible to binoculars and small amateur telescopes) in the Northern 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: W. M. Keck Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 32963 |
| Spectral Type | G5 IV |
| Effective Temp (Teff) | 5,727 K |
| Stellar Radius | 1.1110 R☉ |
| Stellar Mass | 0.9400 M☉ |
| Bolometric Luminosity | 1.191 L☉ |
| Metallicity [Fe/H] | 0.110 dex |
| Stellar Age | 4.990 Gyr |
| Apparent Magnitude | V: 7.600 · G: 7.428 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 3.410000 AU |
| Orbital Period | 2372 days |
| Mean Orbital Velocity | 15.6 km/s |
| Orbital Eccentricity (e) | 0.07000 |
| Orbital Inclination (i) | 19.3000° |
| Mean Bulk Density | 1.51 g/cm³ (78.4 km/s vesc) |
| Insolation Flux | 0.0996 S⊕ (~136 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 124.200 LY (38.079 pc) |