TOI-1759 b
Astrophysical Synthesis & Habitability Characterization
TOI-1759 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1759, located approximately 130.7 light-years (40.07 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.2325% across the stellar disk), this world measures 3.14 Earth radii (0.28 Jupiter radii) and has a measured mass of 10.8 Earth masses. Combining its mass and radius yields a mean bulk density of 1.92 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 20.7 km/s.
In its orbital architecture around TOI-1759, TOI-1759 b completes one full revolution every 18.85 Earth days at a semi-major axis of 0.1177 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 67.9 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 443 K (+170°C / +338°F) and receiving 6.39 S⊕ (~8,697 W/m²), TOI-1759 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1759 is classified as a low-mass red dwarf of spectral type M0.0 V with an effective photospheric temperature of 4,065 K, a radius of 0.597 R☉, a mass of 0.606 M☉, an estimated bolometric luminosity of 0.087 L☉. Stellar evolution modeling indicates an estimated stellar age of 5 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, TOI-1759 shines at apparent V-band magnitude 11.93 (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-1759 |
| Spectral Type | M0.0 V |
| Effective Temp (Teff) | 4,065 K |
| Stellar Radius | 0.5970 R☉ |
| Stellar Mass | 0.6060 M☉ |
| Bolometric Luminosity | 0.087 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 5.000 Gyr |
| Apparent Magnitude | V: 11.930 · G: 10.839 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.117700 AU |
| Orbital Period | 18.85 days |
| Mean Orbital Velocity | 67.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.7200° |
| Mean Bulk Density | 1.92 g/cm³ (20.7 km/s vesc) |
| Insolation Flux | 6.3900 S⊕ (~8,697 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 130.700 LY (40.065 pc) |