HD 102195 b
Astrophysical Synthesis & Habitability Characterization
HD 102195 b is a confirmed gas giant exoplanet orbiting the star HD 102195, located approximately 95.7 light-years (29.34 parsecs) from the Solar System. First announced in 2006 by Kitt Peak National 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 130.31 Earth masses (0.41 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.25 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.65 g⊕ (6.37 m/s²), and an escape velocity of 33.9 km/s.
In its orbital architecture around HD 102195, HD 102195 b completes one full revolution every 4.114 Earth days at a semi-major axis of 0.05 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 132.2 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1035 K (+762°C / +1404°F) and receiving 185.20 S⊕ (~252,057 W/m²), HD 102195 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 102195 is classified as an orange K-type star of spectral type K0 V with an effective photospheric temperature of 5,301 K, a radius of 0.82 R☉, a mass of 0.76 M☉, an estimated bolometric luminosity of 0.476 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.4 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, HD 102195 shines at apparent V-band magnitude 8.07 (accessible to binoculars and small amateur telescopes) in the Northern 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: Kitt Peak National Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 102195 |
| Spectral Type | K0 V |
| Effective Temp (Teff) | 5,301 K |
| Stellar Radius | 0.8200 R☉ |
| Stellar Mass | 0.7600 M☉ |
| Bolometric Luminosity | 0.476 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | 2.400 Gyr |
| Apparent Magnitude | V: 8.070 · G: 7.847 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.050000 AU |
| Orbital Period | 4.114 days |
| Mean Orbital Velocity | 132.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.25 g/cm³ (33.9 km/s vesc) |
| Insolation Flux | 185.2000 S⊕ (~252,057 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 95.700 LY (29.339 pc) |