1RXS J160929.1-210524 b
Astrophysical Synthesis & Habitability Characterization
1RXS J160929.1-210524 b is a confirmed gas giant exoplanet orbiting the star 1RXS J160929.1-210524, located approximately 453.8 light-years (139.14 parsecs) from the Solar System. First announced in 2008 by Gemini Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 18.647 Earth radii (1.66 Jupiter radii) and has a measured mass of 3000 Earth masses (9.44 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.55 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 8.63 g⊕ (84.63 m/s²), and an escape velocity of 141.9 km/s.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1700 K (+1427°C / +2601°F), 1RXS J160929.1-210524 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star 1RXS J160929.1-210524 is classified as an orange K-type star of spectral type K7 V with an effective photospheric temperature of 4,060 K, a radius of 1.3132 R☉, a mass of 0.85 M☉, an estimated bolometric luminosity of 0.42 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.005 Gyr. From Earth, 1RXS J160929.1-210524 shines at apparent V-band magnitude 12.618 (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: Gemini Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | 1RXS J160929.1-210524 |
| Spectral Type | K7 V |
| Effective Temp (Teff) | 4,060 K |
| Stellar Radius | 1.3132 R☉ |
| Stellar Mass | 0.8500 M☉ |
| Bolometric Luminosity | 0.42 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.005 Gyr |
| Apparent Magnitude | V: 12.618 · G: 12.057 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 330.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.55 g/cm³ (141.9 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 453.800 LY (139.135 pc) |