TOI-1807 b
Astrophysical Synthesis & Habitability Characterization
TOI-1807 b is a confirmed super-earth exoplanet orbiting the star TOI-1807, located approximately 138.9 light-years (42.58 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0338% across the stellar disk), this world measures 1.497 Earth radii and has a measured mass of 2.44 Earth masses. Combining its mass and radius yields a mean bulk density of 4.01 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 14.3 km/s.
In its orbital architecture around TOI-1807, TOI-1807 b completes one full revolution every 0.549 Earth days at a semi-major axis of 0.0122 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 241.6 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 1694 K (+1421°C / +2590°F) and receiving 1,407.22 S⊕ (~1,915,226 W/m²), TOI-1807 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1807 is classified as a stellar host with an effective photospheric temperature of 4,914 K, a radius of 0.746 R☉, a mass of 0.8048 M☉, an estimated bolometric luminosity of 0.291 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.1 Gyr and a metallicity of [Fe/H] = 0.044 dex (near-solar heavy-element abundance). From Earth, TOI-1807 shines at apparent V-band magnitude 10 (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-1807 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,914 K |
| Stellar Radius | 0.7460 R☉ |
| Stellar Mass | 0.8048 M☉ |
| Bolometric Luminosity | 0.291 L☉ |
| Metallicity [Fe/H] | 0.044 dex |
| Stellar Age | 2.100 Gyr |
| Apparent Magnitude | V: 10.000 · G: 9.675 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.012200 AU |
| Orbital Period | 0.549 days |
| Mean Orbital Velocity | 241.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 77.7000° |
| Mean Bulk Density | 4.01 g/cm³ (14.3 km/s vesc) |
| Insolation Flux | 1407.2200 S⊕ (~1,915,226 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 138.900 LY (42.578 pc) |