TOI-1180 b
Astrophysical Synthesis & Habitability Characterization
TOI-1180 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1180, located approximately 234.9 light-years (72.02 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 0.1488% across the stellar disk), this world measures 3.072 Earth radii (0.27 Jupiter radii) and has a measured mass of 10 Earth masses. Combining its mass and radius yields a mean bulk density of 1.9 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 20.2 km/s.
In its orbital architecture around TOI-1180, TOI-1180 b completes one full revolution every 9.687 Earth days at a semi-major axis of 0.080799 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 90.7 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 638 K (+365°C / +689°F) and receiving 36.97 S⊕ (~50,316 W/m²), TOI-1180 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1180 is classified as a stellar host with an effective photospheric temperature of 4,738 K, a radius of 0.73 R☉, a mass of 0.75 M☉, an estimated bolometric luminosity of 0.241 L☉. Stellar evolution modeling indicates an estimated stellar age of 5 Gyr and a metallicity of [Fe/H] = 0.067 dex (metal-rich relative to the Sun). From Earth, TOI-1180 shines at apparent V-band magnitude 11.017 (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-1180 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,738 K |
| Stellar Radius | 0.7300 R☉ |
| Stellar Mass | 0.7500 M☉ |
| Bolometric Luminosity | 0.241 L☉ |
| Metallicity [Fe/H] | 0.067 dex |
| Stellar Age | 5.000 Gyr |
| Apparent Magnitude | V: 11.017 · G: 10.745 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.080799 AU |
| Orbital Period | 9.687 days |
| Mean Orbital Velocity | 90.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2078° |
| Mean Bulk Density | 1.9 g/cm³ (20.2 km/s vesc) |
| Insolation Flux | 36.9700 S⊕ (~50,316 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 234.900 LY (72.024 pc) |