TOI-2154 b
Astrophysical Synthesis & Habitability Characterization
TOI-2154 b is a confirmed gas giant exoplanet orbiting the star TOI-2154, located approximately 966.9 light-years (296.46 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.1441% across the stellar disk), this world measures 16.287 Earth radii (1.45 Jupiter radii) and has a measured mass of 292.402 Earth masses (0.92 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.37 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 47.4 km/s.
In its orbital architecture around TOI-2154, TOI-2154 b completes one full revolution every 3.824 Earth days at a semi-major axis of 0.0513 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 145.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.117 carries the world between 0.0453 AU at periapsis and 0.0573 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1580 K (+1307°C / +2385°F) and receiving 1,005.90 S⊕ (~1,369,023 W/m²), TOI-2154 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2154 is classified as a stellar host with an effective photospheric temperature of 6,280 K, a radius of 1.396 R☉, a mass of 1.233 M☉, an estimated bolometric luminosity of 2.72 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.9 Gyr and a metallicity of [Fe/H] = 0.011 dex (near-solar heavy-element abundance). From Earth, TOI-2154 shines at apparent V-band magnitude 11.068 (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-2154 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,280 K |
| Stellar Radius | 1.3960 R☉ |
| Stellar Mass | 1.2330 M☉ |
| Bolometric Luminosity | 2.72 L☉ |
| Metallicity [Fe/H] | 0.011 dex |
| Stellar Age | 2.900 Gyr |
| Apparent Magnitude | V: 11.068 · G: 11.036 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.051300 AU |
| Orbital Period | 3.824 days |
| Mean Orbital Velocity | 145.9 km/s |
| Orbital Eccentricity (e) | 0.11700 |
| Orbital Inclination (i) | 83.3700° |
| Mean Bulk Density | 0.37 g/cm³ (47.4 km/s vesc) |
| Insolation Flux | 1005.8950 S⊕ (~1,369,023 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 966.900 LY (296.460 pc) |