HIP 35965 b

Astrophysical Synthesis & Habitability Characterization

HIP 35965 b is a confirmed gas giant exoplanet orbiting the star HIP 35965, located approximately 163.6 light-years (50.17 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 12.6 Earth radii (1.12 Jupiter radii) and has a measured mass of 2589.984 Earth masses (8.15 Jupiter masses). Combining its mass and radius yields a mean bulk density of 7.14 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 16.31 g⊕ (159.95 m/s²), and an escape velocity of 160.4 km/s.

In its orbital architecture around HIP 35965, HIP 35965 b completes one full revolution every 26125.565 Earth days (71.53Julian years) at a semi-major axis of 15.898 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 6.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.138 carries the world between 13.7041 AU at periapsis and 18.0919 AU at apoapsis, driving measurable seasonal insolation cycles.

❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 49 K (-224°C / -371°F) and an incident flux of 0.00 S⊕ (~1 W/m²), surface water and volatile species on HIP 35965 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.

The host star HIP 35965 is classified as a stellar host with an effective photospheric temperature of 4,836 K, a radius of 0.6976 R☉, a mass of 0.78 M☉, an estimated bolometric luminosity of 0.239 L☉. From Earth, HIP 35965 shines at apparent V-band magnitude 10.18 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.

Discovery Facility: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).