HIP 39330 b
Astrophysical Synthesis & Habitability Characterization
HIP 39330 b is a confirmed gas giant exoplanet orbiting the star HIP 39330, located approximately 118.7 light-years (36.4 parsecs) from the Solar System. First announced in 2026 by Multiple Facilities using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.5 Earth radii (1.2 Jupiter radii) and has a measured mass of 530.773 Earth masses (1.67 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.19 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.91 g⊕ (28.54 m/s²), and an escape velocity of 70.1 km/s.
In its orbital architecture around HIP 39330, HIP 39330 b completes one full revolution every 4650 Earth days (12.73Julian years) at a semi-major axis of 5.05 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 11.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.078 carries the world between 4.6561 AU at periapsis and 5.4439 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 125 K (-148°C / -234°F) and an incident flux of 0.04 S⊕ (~60 W/m²), surface water and volatile species on HIP 39330 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HIP 39330 is classified as a solar-type yellow star of spectral type G5 V with an effective photospheric temperature of 5,748 K, a radius of 1.0279 R☉, a mass of 0.96 M☉, an estimated bolometric luminosity of 1.035 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.57 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, HIP 39330 shines at apparent V-band magnitude 7.52 (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 Facilities · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HIP 39330 |
| Spectral Type | G5 V |
| Effective Temp (Teff) | 5,748 K |
| Stellar Radius | 1.0279 R☉ |
| Stellar Mass | 0.9600 M☉ |
| Bolometric Luminosity | 1.035 L☉ |
| Metallicity [Fe/H] | 0.160 dex |
| Stellar Age | 6.570 Gyr |
| Apparent Magnitude | V: 7.520 · G: 7.354 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 5.050000 AU |
| Orbital Period | 4650 days |
| Mean Orbital Velocity | 11.8 km/s |
| Orbital Eccentricity (e) | 0.07800 |
| Orbital Inclination (i) | 55.0000° |
| Mean Bulk Density | 1.19 g/cm³ (70.1 km/s vesc) |
| Insolation Flux | 0.0440 S⊕ (~60 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 118.700 LY (36.396 pc) |