HD 141399 e
Astrophysical Synthesis & Habitability Characterization
HD 141399 e is a confirmed gas giant exoplanet orbiting the star HD 141399, located approximately 120.7 light-years (37.02 parsecs) from the Solar System. First announced in 2014 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 14.1 Earth radii (1.26 Jupiter radii) and has a measured mass of 209.768 Earth masses (0.66 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.41 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 43.1 km/s.
In its orbital architecture around HD 141399, HD 141399 e completes one full revolution every 5000 Earth days (13.69Julian years) at a semi-major axis of 5 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 10.9 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.26, swinging from 3.7 AU at periapsis out to 6.3 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 142 K (-131°C / -204°F) and an incident flux of 0.06 S⊕ (~87 W/m²), surface water and volatile species on HD 141399 e would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 141399 is classified as an orange K-type star of spectral type K0 with an effective photospheric temperature of 5,600 K, a radius of 1.3872 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 1.698 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.35 dex (metal-rich relative to the Sun). From Earth, HD 141399 shines at apparent V-band magnitude 7.209 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere. The HD 141399 system is a multi-planet architecture hosting 4 confirmed worlds, with HD 141399 e sharing its stellar neighborhood alongside HD 141399 b, HD 141399 c, HD 141399 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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 141399 |
| Spectral Type | K0 |
| Effective Temp (Teff) | 5,600 K |
| Stellar Radius | 1.3872 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 1.698 L☉ |
| Metallicity [Fe/H] | 0.350 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.209 · G: 7.009 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 5.000000 AU |
| Orbital Period | 5000 days |
| Mean Orbital Velocity | 10.9 km/s |
| Orbital Eccentricity (e) | 0.26000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.41 g/cm³ (43.1 km/s vesc) |
| Insolation Flux | 0.0636 S⊕ (~87 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 120.700 LY (37.017 pc) |