TIC 257060897 b
Astrophysical Synthesis & Habitability Characterization
TIC 257060897 b is a confirmed gas giant exoplanet orbiting the star TIC 257060897, located approximately 1649.4 light-years (505.7 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.7216% across the stellar disk), this world measures 17.262 Earth radii (1.54 Jupiter radii) and has a measured mass of 201.503 Earth masses (0.63 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.22 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.68 g⊕ (6.67 m/s²), and an escape velocity of 38.2 km/s.
In its orbital architecture around TIC 257060897, TIC 257060897 b completes one full revolution every 3.66 Earth days at a semi-major axis of 0.04922 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 146.3 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.039 (ranging from 0.0473 AU at periapsis to 0.0511 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1775 K (+1502°C / +2736°F) and receiving 1,804.55 S⊕ (~2,455,999 W/m²), TIC 257060897 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TIC 257060897 is classified as a warm F-type star of spectral type F with an effective photospheric temperature of 5,993 K, a radius of 1.863 R☉, a mass of 1.187 M☉, an estimated bolometric luminosity of 4.017 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.6 Gyr and a metallicity of [Fe/H] = 0.054 dex (metal-rich relative to the Sun). From Earth, TIC 257060897 shines at apparent V-band magnitude 11.814 (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 257060897 |
| Spectral Type | F |
| Effective Temp (Teff) | 5,993 K |
| Stellar Radius | 1.8630 R☉ |
| Stellar Mass | 1.1870 M☉ |
| Bolometric Luminosity | 4.017 L☉ |
| Metallicity [Fe/H] | 0.054 dex |
| Stellar Age | 5.600 Gyr |
| Apparent Magnitude | V: 11.814 · G: 11.666 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.049220 AU |
| Orbital Period | 3.66 days |
| Mean Orbital Velocity | 146.3 km/s |
| Orbital Eccentricity (e) | 0.03900 |
| Orbital Inclination (i) | 84.5500° |
| Mean Bulk Density | 0.22 g/cm³ (38.2 km/s vesc) |
| Insolation Flux | 1804.5549 S⊕ (~2,455,999 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1649.400 LY (505.703 pc) |