UCAC4 328-061594 b
Astrophysical Synthesis & Habitability Characterization
UCAC4 328-061594 b is a confirmed gas giant exoplanet orbiting the star UCAC4 328-061594, located approximately 130.2 light-years (39.91 parsecs) from the Solar System. First announced in 2024 by Multiple Observatories using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.1 Earth radii (1.08 Jupiter radii) and has a measured mass of 6674.397 Earth masses (21 Jupiter masses). Combining its mass and radius yields a mean bulk density of 20.77 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 45.59 g⊕ (447.09 m/s²), and an escape velocity of 262.7 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.100 R⊕, UCAC4 328-061594 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 UCAC4 328-061594 is classified as a catalogued stellar host of spectral type DC with a mass of 1.19 M☉. Stellar evolution modeling indicates an estimated stellar age of 0.4 Gyr. From Earth, UCAC4 328-061594 shines at apparent V-band magnitude 15.689 (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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | UCAC4 328-061594 |
| Spectral Type | DC |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 1.1900 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.400 Gyr |
| Apparent Magnitude | V: 15.689 · G: 15.212 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 19000.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 20.77 g/cm³ (262.7 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 130.200 LY (39.909 pc) |