TIC 139702105 b
Astrophysical Synthesis & Habitability Characterization
TIC 139702105 b is a confirmed sub-neptune exoplanet orbiting the star TIC 139702105, located approximately 299.4 light-years (91.79 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0322% across the stellar disk), this world measures 2.453 Earth radii and has a measured mass of 6.59 Earth masses. Combining its mass and radius yields a mean bulk density of 2.46 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 18.3 km/s.
In its orbital architecture around TIC 139702105, TIC 139702105 b completes one full revolution every 6.836 Earth days.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 2.453 R⊕, TIC 139702105 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 TIC 139702105 is classified as a stellar host with an effective photospheric temperature of 5,742 K, a radius of 1.2542 R☉, a mass of 0.9 M☉, an estimated bolometric luminosity of 1.534 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.28 dex (metal-poor relative to the Sun). From Earth, TIC 139702105 shines at apparent V-band magnitude 9.651 (accessible to binoculars and small amateur telescopes) in the Southern 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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TIC 139702105 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,742 K |
| Stellar Radius | 1.2542 R☉ |
| Stellar Mass | 0.9000 M☉ |
| Bolometric Luminosity | 1.534 L☉ |
| Metallicity [Fe/H] | -0.280 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.651 · G: 9.456 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 6.836 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.8402° |
| Mean Bulk Density | 2.46 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 299.400 LY (91.788 pc) |