TOI-3457 b
Astrophysical Synthesis & Habitability Characterization
TOI-3457 b is a confirmed gas giant exoplanet orbiting the star TOI-3457, located approximately 1208.9 light-years (370.67 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 0.438% across the stellar disk), this world measures 10.64 Earth radii (0.95 Jupiter radii) and has a measured mass of 797.749 Earth masses (2.51 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.65 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 7.05 g⊕ (69.14 m/s²), and an escape velocity of 96.9 km/s.
In its orbital architecture around TOI-3457, TOI-3457 b completes one full revolution every 32.6 Earth days at a semi-major axis of 0.2001 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 66.8 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.59, swinging from 0.082 AU at periapsis out to 0.3182 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 824 K (+551°C / +1024°F) and receiving 17.49 S⊕ (~23,798 W/m²), TOI-3457 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3457 is classified as a stellar host with an effective photospheric temperature of 6,300 K, a radius of 1.474 R☉, a mass of 1.04 M☉, an estimated bolometric luminosity of 3.071 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.28 dex (metal-rich relative to the Sun). From Earth, TOI-3457 shines at apparent V-band magnitude 12.44 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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-3457 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,300 K |
| Stellar Radius | 1.4740 R☉ |
| Stellar Mass | 1.0400 M☉ |
| Bolometric Luminosity | 3.071 L☉ |
| Metallicity [Fe/H] | 0.280 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.440 · G: 12.159 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.200100 AU |
| Orbital Period | 32.6 days |
| Mean Orbital Velocity | 66.8 km/s |
| Orbital Eccentricity (e) | 0.59000 |
| Orbital Inclination (i) | 88.3400° |
| Mean Bulk Density | 3.65 g/cm³ (96.9 km/s vesc) |
| Insolation Flux | 17.4858 S⊕ (~23,798 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1208.900 LY (370.666 pc) |