HIP 5763 b

Astrophysical Synthesis & Habitability Characterization

HIP 5763 b is a confirmed gas giant exoplanet orbiting the star HIP 5763, located approximately 104.1 light-years (31.9 parsecs) from the Solar System. First announced in 2021 by Cerro Tololo Inter-American Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 14.2 Earth radii (1.27 Jupiter radii) and has a measured mass of 162.092 Earth masses (0.51 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.31 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.8 g⊕ (7.85 m/s²), and an escape velocity of 37.8 km/s.

In its orbital architecture around HIP 5763, HIP 5763 b completes one full revolution every 30.014 Earth days at a semi-major axis of 0.17 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 61.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.054 carries the world between 0.1608 AU at periapsis and 0.1792 AU at apoapsis, driving measurable seasonal insolation cycles.

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 441 K (+168°C / +334°F) and receiving 6.30 S⊕ (~8,570 W/m²), HIP 5763 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star HIP 5763 is classified as an orange K-type star of spectral type K6 V with an effective photospheric temperature of 4,352 K, a radius of 0.7504 R☉, a mass of 0.72 M☉, an estimated bolometric luminosity of 0.181 L☉. From Earth, HIP 5763 shines at apparent V-band magnitude 9.82 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere.

Discovery Facility: Cerro Tololo Inter-American Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).