TOI-2453 b
Astrophysical Synthesis & Habitability Characterization
TOI-2453 b is a confirmed sub-neptune exoplanet orbiting the star TOI-2453, located approximately 267.1 light-years (81.9 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 0.3503% across the stellar disk), this world measures 3.244 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.6 Earth masses. Combining its mass and radius yields a mean bulk density of 1.71 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20.2 km/s.
In its orbital architecture around TOI-2453, TOI-2453 b completes one full revolution every 4.441 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 551 K (+278°C / +532°F) and receiving 21.75 S⊕ (~29,600 W/m²), TOI-2453 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2453 is classified as a stellar host with an effective photospheric temperature of 3,720 K, a radius of 0.5025 R☉, a mass of 0.5005 M☉, an estimated bolometric luminosity of 0.043 L☉. From Earth, TOI-2453 shines at apparent V-band magnitude 14.415 (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-2453 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,720 K |
| Stellar Radius | 0.5025 R☉ |
| Stellar Mass | 0.5005 M☉ |
| Bolometric Luminosity | 0.043 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 14.415 · G: 13.510 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 4.441 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.9509° |
| Mean Bulk Density | 1.71 g/cm³ (20.2 km/s vesc) |
| Insolation Flux | 21.7490 S⊕ (~29,600 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 267.100 LY (81.904 pc) |