HD 127195 b
Astrophysical Synthesis & Habitability Characterization
HD 127195 b is a confirmed gas giant exoplanet orbiting the star HD 127195, located approximately 276.3 light-years (84.72 parsecs) from the Solar System. First announced in 2026 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 14 Earth radii (1.25 Jupiter radii) and has a measured mass of 212.945 Earth masses (0.67 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.43 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 43.6 km/s.
In its orbital architecture around HD 127195, HD 127195 b completes one full revolution every 534.5 Earth days (1.46Julian years). With a near-circular eccentricity of e = 0.04, the planet experiences minimal orbital distance variation.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 14.000 R⊕, HD 127195 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star HD 127195 is classified as a stellar host with an effective photospheric temperature of 4,981 K, a radius of 4.16 R☉, a mass of 1.34 M☉, an estimated bolometric luminosity of 9.557 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.3 Gyr and a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, HD 127195 shines at apparent V-band magnitude 7.18 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 127195 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 127195 b sharing its stellar neighborhood alongside HD 127195 c.
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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 127195 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,981 K |
| Stellar Radius | 4.1600 R☉ |
| Stellar Mass | 1.3400 M☉ |
| Bolometric Luminosity | 9.557 L☉ |
| Metallicity [Fe/H] | -0.040 dex |
| Stellar Age | 2.300 Gyr |
| Apparent Magnitude | V: 7.180 · G: 6.923 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 534.5 days |
| Orbital Eccentricity (e) | 0.04000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.43 g/cm³ (43.6 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 276.300 LY (84.717 pc) |