TOI-5799 c
Astrophysical Synthesis & Habitability Characterization
TOI-5799 c 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 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.2527% across the stellar disk), this world measures 1.76 Earth radii and has a measured mass of 3.75 Earth masses. Combining its mass and radius yields a mean bulk density of 3.79 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 16.3 km/s.
In its orbital architecture around TOI-5799, TOI-5799 c completes one full revolution every 14.01 Earth days at a semi-major axis of 0.0782 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 60.7 km/s (compared to Earth's 29.8 km/s).
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for TOI-5799 c place it outside the conservative habitable zone definition pending further atmospheric characterization.
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 c sharing its stellar neighborhood alongside TOI-5799 b.
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) | 0.078200 AU |
| Orbital Period | 14.01 days |
| Mean Orbital Velocity | 60.7 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.3170° |
| Mean Bulk Density | 3.79 g/cm³ (16.3 km/s vesc) |
| Insolation Flux | 2.4202 S⊕ (~3,294 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 90.700 LY (27.812 pc) |