TOI-4465 b
Astrophysical Synthesis & Habitability Characterization
TOI-4465 b is a confirmed gas giant exoplanet orbiting the star TOI-4465, located approximately 395.1 light-years (121.14 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 1.6047% across the stellar disk), this world measures 14.011 Earth radii (1.25 Jupiter radii) and has a measured mass of 1872.009 Earth masses (5.89 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.75 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 9.54 g⊕ (93.56 m/s²), and an escape velocity of 129.3 km/s.
In its orbital architecture around TOI-4465, TOI-4465 b completes one full revolution every 101.941 Earth days at a semi-major axis of 0.416 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 44.4 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.24 carries the world between 0.3162 AU at periapsis and 0.5158 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 427 K (+154°C / +309°F) and receiving 130.53 S⊕ (~177,649 W/m²), TOI-4465 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4465 is classified as a solar-type yellow star of spectral type G V with an effective photospheric temperature of 5,545 K, a radius of 1.014 R☉, a mass of 0.93 M☉, an estimated bolometric luminosity of 0.872 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, TOI-4465 shines at apparent V-band magnitude 10.427 (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-4465 |
| Spectral Type | G V |
| Effective Temp (Teff) | 5,545 K |
| Stellar Radius | 1.0140 R☉ |
| Stellar Mass | 0.9300 M☉ |
| Bolometric Luminosity | 0.872 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.427 · G: 10.326 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.416000 AU |
| Orbital Period | 101.941 days |
| Mean Orbital Velocity | 44.4 km/s |
| Orbital Eccentricity (e) | 0.24000 |
| Orbital Inclination (i) | 89.9500° |
| Mean Bulk Density | 3.75 g/cm³ (129.3 km/s vesc) |
| Insolation Flux | 130.5280 S⊕ (~177,649 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 395.100 LY (121.139 pc) |