TOI-1799 b
Astrophysical Synthesis & Habitability Characterization
TOI-1799 b is a confirmed super-earth exoplanet orbiting the star TOI-1799, located approximately 202.6 light-years (62.13 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 0.0247% across the stellar disk), this world measures 1.642 Earth radii and has a measured mass of 4 Earth masses. Combining its mass and radius yields a mean bulk density of 4.98 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.48 g⊕ (14.51 m/s²), and an escape velocity of 17.5 km/s.
In its orbital architecture around TOI-1799, TOI-1799 b completes one full revolution every 7.095 Earth days at a semi-major axis of 0.072502 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 111.2 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 923 K (+650°C / +1202°F) and receiving 164.26 S⊕ (~223,558 W/m²), TOI-1799 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1799 is classified as a stellar host with an effective photospheric temperature of 5,690 K, a radius of 0.957 R☉, a mass of 1.01 M☉, an estimated bolometric luminosity of 0.861 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.1 Gyr and a metallicity of [Fe/H] = -0.064 dex (near-solar heavy-element abundance). From Earth, TOI-1799 shines at apparent V-band magnitude 8.98 (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-1799 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,690 K |
| Stellar Radius | 0.9570 R☉ |
| Stellar Mass | 1.0100 M☉ |
| Bolometric Luminosity | 0.861 L☉ |
| Metallicity [Fe/H] | -0.064 dex |
| Stellar Age | 5.100 Gyr |
| Apparent Magnitude | V: 8.980 · G: 8.810 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.072502 AU |
| Orbital Period | 7.095 days |
| Mean Orbital Velocity | 111.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.98 g/cm³ (17.5 km/s vesc) |
| Insolation Flux | 164.2600 S⊕ (~223,558 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 202.600 LY (62.127 pc) |