USco1621 b
Astrophysical Synthesis & Habitability Characterization
USco1621 b is a confirmed gas giant exoplanet orbiting the star USco1621 A, located approximately 449.8 light-years (137.9 parsecs) from the Solar System. First announced in 2019 by Multiple Observatories using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.2 Earth radii (1.09 Jupiter radii) and has a measured mass of 5085.28 Earth masses (16 Jupiter masses). Combining its mass and radius yields a mean bulk density of 15.44 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 34.17 g⊕ (335.09 m/s²), and an escape velocity of 228.4 km/s.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2270 K (+1997°C / +3627°F), USco1621 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star USco1621 A is classified as a low-mass red dwarf of spectral type M2.5 V with an effective photospheric temperature of 3,460 K, a radius of 0.7101 R☉, a mass of 0.36 M☉, an estimated bolometric luminosity of 0.065 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.008 Gyr. From Earth, USco1621 A shines at apparent V-band magnitude 15.543 (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 | USco1621 A |
| Spectral Type | M2.5 V |
| Effective Temp (Teff) | 3,460 K |
| Stellar Radius | 0.7101 R☉ |
| Stellar Mass | 0.3600 M☉ |
| Bolometric Luminosity | 0.065 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.008 Gyr |
| Apparent Magnitude | V: 15.543 · G: 14.177 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2880.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 15.44 g/cm³ (228.4 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 449.800 LY (137.901 pc) |