2MASS J21252752-8138278 b
Astrophysical Synthesis & Habitability Characterization
2MASS J21252752-8138278 b is a confirmed gas giant exoplanet orbiting the star 2MASS J21252752-8138278, located approximately 111.3 light-years (34.12 parsecs) from the Solar System. First announced in 2024 by European Space Agency (ESA) Gaia Satellite using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.4 Earth radii (1.11 Jupiter radii) and has a measured mass of 3813.941 Earth masses (12 Jupiter masses). Combining its mass and radius yields a mean bulk density of 11.03 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 24.8 g⊕ (243.2 m/s²), and an escape velocity of 196.2 km/s.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1616 K (+1343°C / +2449°F), 2MASS J21252752-8138278 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star 2MASS J21252752-8138278 is classified as a stellar host with an effective photospheric temperature of 3,592 K, a radius of 0.6728 R☉, a mass of 0.644 M☉, an estimated bolometric luminosity of 0.068 L☉. From Earth, 2MASS J21252752-8138278 shines at apparent V-band magnitude 11.804 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: European Space Agency (ESA) Gaia Satellite · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | 2MASS J21252752-8138278 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,592 K |
| Stellar Radius | 0.6728 R☉ |
| Stellar Mass | 0.6440 M☉ |
| Bolometric Luminosity | 0.068 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 11.804 · G: 10.813 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 7493.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 11.03 g/cm³ (196.2 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 111.300 LY (34.115 pc) |