TOI-5159 b
Astrophysical Synthesis & Habitability Characterization
TOI-5159 b is a confirmed super-earth exoplanet orbiting the star TOI-5159, located approximately 180 light-years (55.18 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 0.0276% across the stellar disk), this world measures 1.547 Earth radii and has a measured mass of 3.01 Earth masses. Combining its mass and radius yields a mean bulk density of 4.48 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.26 g⊕ (12.36 m/s²), and an escape velocity of 15.6 km/s.
In its orbital architecture around TOI-5159, TOI-5159 b completes one full revolution every 5.836 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 866 K (+593°C / +1099°F) and receiving 133.10 S⊕ (~181,150 W/m²), TOI-5159 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5159 is classified as a stellar host with an effective photospheric temperature of 5,156 K, a radius of 0.8541 R☉, a mass of 0.9 M☉, an estimated bolometric luminosity of 0.463 L☉. From Earth, TOI-5159 shines at apparent V-band magnitude 9.369 (accessible to binoculars and small amateur telescopes) 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-5159 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,156 K |
| Stellar Radius | 0.8541 R☉ |
| Stellar Mass | 0.9000 M☉ |
| Bolometric Luminosity | 0.463 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 9.369 · G: 9.192 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 5.836 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.2764° |
| Mean Bulk Density | 4.48 g/cm³ (15.6 km/s vesc) |
| Insolation Flux | 133.1006 S⊕ (~181,150 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 180.000 LY (55.179 pc) |