2MASS J01033563-5515561 AB b
Astrophysical Synthesis & Habitability Characterization
2MASS J01033563-5515561 AB b is a confirmed gas giant exoplanet orbiting the star 2MASS J01033563-5515561 A, located approximately 153.9 light-years (47.2 parsecs) from the Solar System. First announced in 2013 by Paranal Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.3 Earth radii (1.1 Jupiter radii) and has a measured mass of 4131.79 Earth masses (13 Jupiter masses). Combining its mass and radius yields a mean bulk density of 12.24 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 27.31 g⊕ (267.82 m/s²), and an escape velocity of 205 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.300 R⊕, 2MASS J01033563-5515561 AB 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 2MASS J01033563-5515561 A is classified as a low-mass red dwarf of spectral type M5.5/M6 with a mass of 0.19 M☉. Stellar evolution modeling indicates an estimated stellar age of 0.03 Gyr. From Earth, 2MASS J01033563-5515561 A shines at apparent V-band magnitude 15.788 (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: Paranal Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | 2MASS J01033563-5515561 A |
| Spectral Type | M5.5/M6 |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 0.1900 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.030 Gyr |
| Apparent Magnitude | V: 15.788 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 84.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 12.24 g/cm³ (205 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 153.900 LY (47.200 pc) |