TIC 139270665 b
Astrophysical Synthesis & Habitability Characterization
TIC 139270665 b is a confirmed gas giant exoplanet orbiting the star TIC 139270665, located approximately 619.3 light-years (189.88 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.4256% across the stellar disk), this world measures 7.23 Earth radii (0.65 Jupiter radii) and has a measured mass of 147.155 Earth masses (0.46 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.15 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 2.82 g⊕ (27.65 m/s²), and an escape velocity of 50.5 km/s.
In its orbital architecture around TIC 139270665, TIC 139270665 b completes one full revolution every 23.624 Earth days at a semi-major axis of 0.163 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 75.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.105 carries the world between 0.1459 AU at periapsis and 0.1801 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 703 K (+430°C / +806°F) and receiving 40.30 S⊕ (~54,848 W/m²), TIC 139270665 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TIC 139270665 is classified as a solar-type yellow star of spectral type G2 with an effective photospheric temperature of 5,844 K, a radius of 1.016 R☉, a mass of 1.035 M☉, an estimated bolometric luminosity of 1.08 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.4 Gyr and a metallicity of [Fe/H] = 0.156 dex (metal-rich relative to the Sun). From Earth, TIC 139270665 shines at apparent V-band magnitude 10.385 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TIC 139270665 system is a multi-planet architecture hosting 2 confirmed worlds, with TIC 139270665 b sharing its stellar neighborhood alongside TIC 139270665 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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TIC 139270665 |
| Spectral Type | G2 |
| Effective Temp (Teff) | 5,844 K |
| Stellar Radius | 1.0160 R☉ |
| Stellar Mass | 1.0350 M☉ |
| Bolometric Luminosity | 1.08 L☉ |
| Metallicity [Fe/H] | 0.156 dex |
| Stellar Age | 3.400 Gyr |
| Apparent Magnitude | V: 10.385 · G: 10.181 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.163000 AU |
| Orbital Period | 23.624 days |
| Mean Orbital Velocity | 75.1 km/s |
| Orbital Eccentricity (e) | 0.10500 |
| Orbital Inclination (i) | 89.7600° |
| Mean Bulk Density | 2.15 g/cm³ (50.5 km/s vesc) |
| Insolation Flux | 40.3000 S⊕ (~54,848 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 619.300 LY (189.875 pc) |