KMT-2021-BLG-0119L b
Astrophysical Synthesis & Habitability Characterization
KMT-2021-BLG-0119L b is a confirmed gas giant exoplanet orbiting the star KMT-2021-BLG-0119L, located approximately 10208.7 light-years (3130 parsecs) from the Solar System. First announced in 2022 by KMTNet using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 12.8 Earth radii (1.14 Jupiter radii) and has a measured mass of 1754.413 Earth masses (5.52 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.61 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 10.71 g⊕ (105.03 m/s²), and an escape velocity of 131 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.800 R⊕, KMT-2021-BLG-0119L 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 KMT-2021-BLG-0119L is classified as a stellar host with a mass of 0.56 M☉.
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: KMTNet · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | KMT-2021-BLG-0119L |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 0.5600 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | — |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.920000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.61 g/cm³ (131 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 10208.700 LY (3130.000 pc) |