HIP 75092 b
Astrophysical Synthesis & Habitability Characterization
HIP 75092 b is a confirmed gas giant exoplanet orbiting the star HIP 75092, located approximately 266.4 light-years (81.67 parsecs) from the Solar System. First announced in 2021 by Multiple Observatories 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 568.913 Earth masses (1.79 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.28 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.12 g⊕ (30.6 m/s²), and an escape velocity of 72.6 km/s.
In its orbital architecture around HIP 75092, HIP 75092 b completes one full revolution every 926.4 Earth days (2.54Julian years) at a semi-major axis of 2.02 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 23.7 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.42, swinging from 1.1716 AU at periapsis out to 2.8684 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 353 K (+80°C / +176°F) and receiving 2.57 S⊕ (~3,492 W/m²), HIP 75092 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HIP 75092 is classified as an orange K-type star of spectral type K0 III with an effective photospheric temperature of 4,891 K, a radius of 4.53 R☉, a mass of 1.28 M☉, an estimated bolometric luminosity of 10.536 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.3 Gyr and a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, HIP 75092 shines at apparent V-band magnitude 7.11 (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 Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HIP 75092 |
| Spectral Type | K0 III |
| Effective Temp (Teff) | 4,891 K |
| Stellar Radius | 4.5300 R☉ |
| Stellar Mass | 1.2800 M☉ |
| Bolometric Luminosity | 10.536 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | 4.300 Gyr |
| Apparent Magnitude | V: 7.110 · G: 6.830 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.020000 AU |
| Orbital Period | 926.4 days |
| Mean Orbital Velocity | 23.7 km/s |
| Orbital Eccentricity (e) | 0.42000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.28 g/cm³ (72.6 km/s vesc) |
| Insolation Flux | 2.5659 S⊕ (~3,492 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 266.400 LY (81.670 pc) |