SWEEPS-11 b
Astrophysical Synthesis & Habitability Characterization
SWEEPS-11 b is a confirmed gas giant exoplanet orbiting the star SWEEPS-11, located approximately 27723.3 light-years (8500 parsecs) from the Solar System. First announced in 2006 by Hubble Space Telescope using the Transit detection technique (producing an estimated primary transit depth of 0.6413% across the stellar disk), this world measures 12.666 Earth radii (1.13 Jupiter radii) and has a measured mass of 3082.82 Earth masses (9.7 Jupiter masses). Combining its mass and radius yields a mean bulk density of 8.37 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 19.22 g⊕ (188.48 m/s²), and an escape velocity of 174.5 km/s.
In its orbital architecture around SWEEPS-11, SWEEPS-11 b completes one full revolution every 1.796 Earth days at a semi-major axis of 0.03 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 181.7 km/s (compared to Earth's 29.8 km/s).
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.666 R⊕, SWEEPS-11 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 SWEEPS-11 is classified as a stellar host with a radius of 1.45 R☉, a mass of 1.1 M☉. From Earth, SWEEPS-11 shines at apparent V-band magnitude 19.83 (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: Hubble Space Telescope · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | SWEEPS-11 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | — |
| Stellar Radius | 1.4500 R☉ |
| Stellar Mass | 1.1000 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 19.830 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.030000 AU |
| Orbital Period | 1.796 days |
| Mean Orbital Velocity | 181.7 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 8.37 g/cm³ (174.5 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 27723.300 LY (8500.000 pc) |