HD 190360 b
Astrophysical Synthesis & Habitability Characterization
HD 190360 b is a confirmed gas giant exoplanet orbiting the star HD 190360, located approximately 52.2 light-years (16.01 parsecs) from the Solar System. First announced in 2003 by Haute-Provence Observatory 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 537 Earth masses (1.69 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.2 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.95 g⊕ (28.93 m/s²), and an escape velocity of 70.5 km/s.
In its orbital architecture around HD 190360, HD 190360 b completes one full revolution every 2887.5 Earth days (7.91Julian years) at a semi-major axis of 3.965 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 14.9 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.3342, swinging from 2.6399 AU at periapsis out to 5.2901 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 150 K (-123°C / -189°F) and an incident flux of 0.07 S⊕ (~101 W/m²), surface water and volatile species on HD 190360 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 190360 is classified as a solar-type yellow star of spectral type G7 IV-V with an effective photospheric temperature of 5,560 K, a radius of 1.14 R☉, a mass of 0.996 M☉, an estimated bolometric luminosity of 1.114 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.3 Gyr and a metallicity of [Fe/H] = 0.26 dex (metal-rich relative to the Sun). From Earth, HD 190360 shines at apparent V-band magnitude 5.738 (visible to the unaided human eye under dark skies) in the Northern celestial hemisphere. The HD 190360 system is a multi-planet architecture hosting 3 confirmed worlds, with HD 190360 b sharing its stellar neighborhood alongside HD 190360 c, HD 190360 d.
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: Haute-Provence Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 190360 |
| Spectral Type | G7 IV-V |
| Effective Temp (Teff) | 5,560 K |
| Stellar Radius | 1.1400 R☉ |
| Stellar Mass | 0.9960 M☉ |
| Bolometric Luminosity | 1.114 L☉ |
| Metallicity [Fe/H] | 0.260 dex |
| Stellar Age | 11.300 Gyr |
| Apparent Magnitude | V: 5.738 · G: 5.554 |
| System Architecture | 2 Stars, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 3.965000 AU |
| Orbital Period | 2887.5 days |
| Mean Orbital Velocity | 14.9 km/s |
| Orbital Eccentricity (e) | 0.33420 |
| Orbital Inclination (i) | 71.0000° |
| Mean Bulk Density | 1.2 g/cm³ (70.5 km/s vesc) |
| Insolation Flux | 0.0741 S⊕ (~101 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 52.200 LY (16.007 pc) |