TOI-5153 b
Astrophysical Synthesis & Habitability Characterization
TOI-5153 b is a confirmed gas giant exoplanet orbiting the star TOI-5153, located approximately 1273.6 light-years (390.48 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.6054% across the stellar disk), this world measures 11.882 Earth radii (1.06 Jupiter radii) and has a measured mass of 1036.121 Earth masses (3.26 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.41 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 7.34 g⊕ (71.98 m/s²), and an escape velocity of 104.5 km/s.
In its orbital architecture around TOI-5153, TOI-5153 b completes one full revolution every 20.33 Earth days at a semi-major axis of 0.158 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 84.5 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.091 carries the world between 0.1436 AU at periapsis and 0.1724 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 906 K (+633°C / +1171°F) and receiving 49.56 S⊕ (~67,446 W/m²), TOI-5153 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5153 is classified as a warm F-type star of spectral type F8 V with an effective photospheric temperature of 6,300 K, a radius of 1.4 R☉, a mass of 1.24 M☉, an estimated bolometric luminosity of 2.77 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.4 Gyr and a metallicity of [Fe/H] = 0.12 dex (metal-rich relative to the Sun). From Earth, TOI-5153 shines at apparent V-band magnitude 11.932 (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-5153 |
| Spectral Type | F8 V |
| Effective Temp (Teff) | 6,300 K |
| Stellar Radius | 1.4000 R☉ |
| Stellar Mass | 1.2400 M☉ |
| Bolometric Luminosity | 2.77 L☉ |
| Metallicity [Fe/H] | 0.120 dex |
| Stellar Age | 5.400 Gyr |
| Apparent Magnitude | V: 11.932 · G: 11.578 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.158000 AU |
| Orbital Period | 20.33 days |
| Mean Orbital Velocity | 84.5 km/s |
| Orbital Eccentricity (e) | 0.09100 |
| Orbital Inclination (i) | 88.2700° |
| Mean Bulk Density | 3.41 g/cm³ (104.5 km/s vesc) |
| Insolation Flux | 49.5559 S⊕ (~67,446 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1273.600 LY (390.484 pc) |