TOI-5143 c
Astrophysical Synthesis & Habitability Characterization
TOI-5143 c is a confirmed gas giant exoplanet orbiting the star TOI-5143, located approximately 591.6 light-years (181.38 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 3.0586% across the stellar disk), this world has a measured radius of 16.253 Earth radii (1.45 R♃), though radial-velocity mass constraints remain unmeasured in the current composite catalogue.
In its orbital architecture around TOI-5143, TOI-5143 c completes one full revolution every 5.21 Earth days at a semi-major axis of 0.05602 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 117 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 904 K (+631°C / +1168°F) and receiving 158.16 S⊕ (~215,262 W/m²), TOI-5143 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5143 is classified as an orange K-type star of spectral type K V with an effective photospheric temperature of 5,183 K, a radius of 0.852 R☉, a mass of 0.864 M☉, an estimated bolometric luminosity of 0.47 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.4 Gyr and a metallicity of [Fe/H] = 0.107 dex (metal-rich relative to the Sun). From Earth, TOI-5143 shines at apparent V-band magnitude 11.935 (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-5143 |
| Spectral Type | K V |
| Effective Temp (Teff) | 5,183 K |
| Stellar Radius | 0.8520 R☉ |
| Stellar Mass | 0.8640 M☉ |
| Bolometric Luminosity | 0.47 L☉ |
| Metallicity [Fe/H] | 0.107 dex |
| Stellar Age | 7.400 Gyr |
| Apparent Magnitude | V: 11.935 · G: 11.811 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.056020 AU |
| Orbital Period | 5.21 days |
| Mean Orbital Velocity | 117 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 86.0200° |
| Insolation Flux | 158.1646 S⊕ (~215,262 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 591.600 LY (181.380 pc) |