TOI-5788 c
Astrophysical Synthesis & Habitability Characterization
TOI-5788 c is a confirmed sub-neptune exoplanet orbiting the star TOI-5788, located approximately 318.4 light-years (97.61 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0573% across the stellar disk), this world measures 2.272 Earth radii and has a measured mass of 6.4 Earth masses. Combining its mass and radius yields a mean bulk density of 3.01 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 18.8 km/s.
In its orbital architecture around TOI-5788, TOI-5788 c completes one full revolution every 16.213 Earth days at a semi-major axis of 0.1197 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 80.3 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.046 (ranging from 0.1142 AU at periapsis to 0.1252 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 667 K (+394°C / +741°F) and receiving 49.80 S⊕ (~67,778 W/m²), TOI-5788 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5788 is classified as a stellar host with an effective photospheric temperature of 5,615 K, a radius of 0.87 R☉, a mass of 0.87 M☉, an estimated bolometric luminosity of 0.675 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.72 Gyr and a metallicity of [Fe/H] = -0.32 dex (metal-poor relative to the Sun). From Earth, TOI-5788 shines at apparent V-band magnitude 10.153 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-5788 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-5788 c sharing its stellar neighborhood alongside TOI-5788 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-5788 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,615 K |
| Stellar Radius | 0.8700 R☉ |
| Stellar Mass | 0.8700 M☉ |
| Bolometric Luminosity | 0.675 L☉ |
| Metallicity [Fe/H] | -0.320 dex |
| Stellar Age | 5.720 Gyr |
| Apparent Magnitude | V: 10.153 · G: 10.055 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.119700 AU |
| Orbital Period | 16.213 days |
| Mean Orbital Velocity | 80.3 km/s |
| Orbital Eccentricity (e) | 0.04600 |
| Orbital Inclination (i) | 89.6000° |
| Mean Bulk Density | 3.01 g/cm³ (18.8 km/s vesc) |
| Insolation Flux | 49.8000 S⊕ (~67,778 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 318.400 LY (97.614 pc) |