TOI-1453 c
Astrophysical Synthesis & Habitability Characterization
TOI-1453 c is a confirmed sub-neptune exoplanet orbiting the star TOI-1453, located approximately 256.8 light-years (78.74 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 0.0802% across the stellar disk), this world measures 2.224 Earth radii and has a measured mass of 2.95 Earth masses. Combining its mass and radius yields a mean bulk density of 1.48 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.6 g⊕ (5.88 m/s²), and an escape velocity of 12.9 km/s.
In its orbital architecture around TOI-1453, TOI-1453 c completes one full revolution every 6.589 Earth days. 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 820 K (+547°C / +1017°F) and receiving 75.30 S⊕ (~102,483 W/m²), TOI-1453 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1453 is classified as a stellar host with an effective photospheric temperature of 4,975 K, a radius of 0.72 R☉, a mass of 0.715 M☉, an estimated bolometric luminosity of 0.285 L☉. Stellar evolution modeling indicates an estimated stellar age of 12 Gyr and a metallicity of [Fe/H] = -0.31 dex (metal-poor relative to the Sun). From Earth, TOI-1453 shines at apparent V-band magnitude 11.113 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1453 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1453 c sharing its stellar neighborhood alongside TOI-1453 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-1453 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,975 K |
| Stellar Radius | 0.7200 R☉ |
| Stellar Mass | 0.7150 M☉ |
| Bolometric Luminosity | 0.285 L☉ |
| Metallicity [Fe/H] | -0.310 dex |
| Stellar Age | 12.000 Gyr |
| Apparent Magnitude | V: 11.113 · G: 10.727 |
| System Architecture | 2 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 6.589 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.6100° |
| Mean Bulk Density | 1.48 g/cm³ (12.9 km/s vesc) |
| Insolation Flux | 75.3000 S⊕ (~102,483 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 256.800 LY (78.742 pc) |