TIC 154870955 b
Astrophysical Synthesis & Habitability Characterization
TIC 154870955 b is a confirmed sub-neptune exoplanet orbiting the star TIC 154870955, located approximately 738.6 light-years (226.46 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 0.1535% across the stellar disk), this world measures 3.095 Earth radii (0.28 Jupiter radii) and has a measured mass of 9.77 Earth masses. Combining its mass and radius yields a mean bulk density of 1.82 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.02 g⊕ (10 m/s²), and an escape velocity of 19.9 km/s.
In its orbital architecture around TIC 154870955, TIC 154870955 b completes one full revolution every 7.97 Earth days.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 3.095 R⊕, TIC 154870955 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star TIC 154870955 is classified as a stellar host with an effective photospheric temperature of 4,740 K, a radius of 0.7243 R☉, a mass of 0.828 M☉, an estimated bolometric luminosity of 0.238 L☉. From Earth, TIC 154870955 shines at apparent V-band magnitude 13.43 (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 | TIC 154870955 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,740 K |
| Stellar Radius | 0.7243 R☉ |
| Stellar Mass | 0.8280 M☉ |
| Bolometric Luminosity | 0.238 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 13.430 · G: 13.195 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 7.97 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.1850° |
| Mean Bulk Density | 1.82 g/cm³ (19.9 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 738.600 LY (226.463 pc) |