2MASS J0249-0557 c
Astrophysical Synthesis & Habitability Characterization
2MASS J0249-0557 c is a confirmed gas giant exoplanet orbiting the star 2MASS J0249-0557 A, located approximately 215.5 light-years (66.06 parsecs) from the Solar System. First announced in 2018 by Mauna Kea Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 17.374 Earth radii (1.55 Jupiter radii) and has a measured mass of 3616.887 Earth masses (11.38 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.8 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 11.98 g⊕ (117.48 m/s²), and an escape velocity of 161.4 km/s.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1723 K (+1450°C / +2642°F), 2MASS J0249-0557 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star 2MASS J0249-0557 A is classified as a low-mass red dwarf of spectral type M6 V with an effective photospheric temperature of 2,859 K, a radius of 0.316 R☉, a mass of 0.046 M☉, an estimated bolometric luminosity of 0.00599 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.022 Gyr. From Earth, 2MASS J0249-0557 A shines at apparent V-band magnitude 18.3 (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: Mauna Kea Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | 2MASS J0249-0557 A |
| Spectral Type | M6 V |
| Effective Temp (Teff) | 2,859 K |
| Stellar Radius | 0.3160 R☉ |
| Stellar Mass | 0.0460 M☉ |
| Bolometric Luminosity | 0.00599 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.022 Gyr |
| Apparent Magnitude | V: 18.300 · G: 15.689 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 1950.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.8 g/cm³ (161.4 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 215.500 LY (66.061 pc) |