TOI-1154 b
Astrophysical Synthesis & Habitability Characterization
TOI-1154 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1154, located approximately 306.2 light-years (93.88 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 0.0727% across the stellar disk), this world measures 2.73 Earth radii and has a measured mass of 7.9 Earth masses. Combining its mass and radius yields a mean bulk density of 2.14 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 19 km/s.
In its orbital architecture around TOI-1154, TOI-1154 b completes one full revolution every 21.745 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 642 K (+369°C / +696°F) and receiving 28.25 S⊕ (~38,449 W/m²), TOI-1154 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1154 is classified as a stellar host with an effective photospheric temperature of 5,704 K, a radius of 0.9285 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 0.819 L☉. From Earth, TOI-1154 shines at apparent V-band magnitude 9.955 (accessible to binoculars and small amateur telescopes) 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-1154 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,704 K |
| Stellar Radius | 0.9285 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 0.819 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 9.955 · G: 9.760 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 21.745 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.14 g/cm³ (19 km/s vesc) |
| Insolation Flux | 28.2504 S⊕ (~38,449 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 306.200 LY (93.882 pc) |