TOI-1753 b
Astrophysical Synthesis & Habitability Characterization
TOI-1753 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1753, located approximately 739.3 light-years (226.67 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 0.0547% across the stellar disk), this world measures 2.479 Earth radii and has a measured mass of 16.6 Earth masses. Combining its mass and radius yields a mean bulk density of 6.01 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 2.7 g⊕ (26.48 m/s²), and an escape velocity of 28.9 km/s.
In its orbital architecture around TOI-1753, TOI-1753 b completes one full revolution every 5.385 Earth days at a semi-major axis of 0.059 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 119.2 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1005 K (+732°C / +1350°F) and receiving 238.00 S⊕ (~323,913 W/m²), TOI-1753 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1753 is classified as a stellar host with an effective photospheric temperature of 5,621 K, a radius of 0.9715 R☉, a mass of 0.9483 M☉, an estimated bolometric luminosity of 0.845 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.9 Gyr and a metallicity of [Fe/H] = 0.026 dex (near-solar heavy-element abundance). From Earth, TOI-1753 shines at apparent V-band magnitude 11.831 (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-1753 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,621 K |
| Stellar Radius | 0.9715 R☉ |
| Stellar Mass | 0.9483 M☉ |
| Bolometric Luminosity | 0.845 L☉ |
| Metallicity [Fe/H] | 0.026 dex |
| Stellar Age | 5.900 Gyr |
| Apparent Magnitude | V: 11.831 · G: 11.664 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.059000 AU |
| Orbital Period | 5.385 days |
| Mean Orbital Velocity | 119.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 6.01 g/cm³ (28.9 km/s vesc) |
| Insolation Flux | 237.9960 S⊕ (~323,913 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 739.300 LY (226.671 pc) |