TOI-5728 b
Astrophysical Synthesis & Habitability Characterization
TOI-5728 b is a confirmed super-earth exoplanet orbiting the star TOI-5728, located approximately 178.4 light-years (54.71 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 0.1054% across the stellar disk), this world measures 1.31 Earth radii and has a measured mass of 2.27 Earth masses. Combining its mass and radius yields a mean bulk density of 5.57 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.32 g⊕ (12.94 m/s²), and an escape velocity of 14.7 km/s.
In its orbital architecture around TOI-5728, TOI-5728 b completes one full revolution every 11.498 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 382 K (+109°C / +228°F) and receiving 3.51 S⊕ (~4,780 W/m²), TOI-5728 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5728 is classified as a stellar host with an effective photospheric temperature of 3,419 K, a radius of 0.37 R☉, a mass of 0.36 M☉, an estimated bolometric luminosity of 0.017 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.12 dex (metal-poor relative to the Sun). From Earth, TOI-5728 shines at apparent V-band magnitude 15.02 (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-5728 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,419 K |
| Stellar Radius | 0.3700 R☉ |
| Stellar Mass | 0.3600 M☉ |
| Bolometric Luminosity | 0.017 L☉ |
| Metallicity [Fe/H] | -0.120 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.020 · G: 13.685 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 11.498 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.8300° |
| Mean Bulk Density | 5.57 g/cm³ (14.7 km/s vesc) |
| Insolation Flux | 3.5120 S⊕ (~4,780 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 178.400 LY (54.705 pc) |