TOI-1739 b
Astrophysical Synthesis & Habitability Characterization
TOI-1739 b is a confirmed super-earth exoplanet orbiting the star TOI-1739, located approximately 231.5 light-years (70.98 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 0.0522% across the stellar disk), this world measures 1.946 Earth radii and has a measured mass of 4.45 Earth masses. Combining its mass and radius yields a mean bulk density of 3.33 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.18 g⊕ (11.57 m/s²), and an escape velocity of 16.9 km/s.
In its orbital architecture around TOI-1739, TOI-1739 b completes one full revolution every 8.303 Earth days at a semi-major axis of 0.073872 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 96.8 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 756 K (+483°C / +901°F) and receiving 53.91 S⊕ (~73,372 W/m²), TOI-1739 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1739 is classified as a stellar host with an effective photospheric temperature of 4,814 K, a radius of 0.781 R☉, a mass of 0.78 M☉, an estimated bolometric luminosity of 0.294 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.3 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, TOI-1739 shines at apparent V-band magnitude 10.692 (faint and requiring research-grade or CCD telescopic photometry) 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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-1739 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,814 K |
| Stellar Radius | 0.7810 R☉ |
| Stellar Mass | 0.7800 M☉ |
| Bolometric Luminosity | 0.294 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 6.300 Gyr |
| Apparent Magnitude | V: 10.692 · G: 10.419 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.073872 AU |
| Orbital Period | 8.303 days |
| Mean Orbital Velocity | 96.8 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.2700° |
| Mean Bulk Density | 3.33 g/cm³ (16.9 km/s vesc) |
| Insolation Flux | 53.9100 S⊕ (~73,372 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 231.500 LY (70.982 pc) |