TOI-5799 b
Astrophysical Synthesis & Habitability Characterization
TOI-5799 b is a confirmed super-earth exoplanet orbiting the star TOI-5799, located approximately 90.7 light-years (27.81 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 0.245% across the stellar disk), this world measures 1.733 Earth radii and has a measured mass of 3.65 Earth masses. Combining its mass and radius yields a mean bulk density of 3.87 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 16.2 km/s.
In its orbital architecture around TOI-5799, TOI-5799 b completes one full revolution every 4.165 Earth days at a semi-major axis of 0.0348 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 90.9 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 505 K (+232°C / +450°F) and receiving 11.91 S⊕ (~16,210 W/m²), TOI-5799 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5799 is classified as a low-mass red dwarf of spectral type M2 V with an effective photospheric temperature of 3,452 K, a radius of 0.321 R☉, a mass of 0.325 M☉, an estimated bolometric luminosity of 0.013 L☉. Stellar evolution modeling indicates an estimated stellar age of 9.6 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, TOI-5799 shines at apparent V-band magnitude 13.29 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-5799 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-5799 b sharing its stellar neighborhood alongside TOI-5799 c.
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-5799 |
| Spectral Type | M2 V |
| Effective Temp (Teff) | 3,452 K |
| Stellar Radius | 0.3210 R☉ |
| Stellar Mass | 0.3250 M☉ |
| Bolometric Luminosity | 0.013 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 9.600 Gyr |
| Apparent Magnitude | V: 13.290 · G: 12.321 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.034800 AU |
| Orbital Period | 4.165 days |
| Mean Orbital Velocity | 90.9 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.1500° |
| Mean Bulk Density | 3.87 g/cm³ (16.2 km/s vesc) |
| Insolation Flux | 11.9100 S⊕ (~16,210 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 90.700 LY (27.812 pc) |