Kepler-1085 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1085 b is a confirmed gas giant exoplanet orbiting the star Kepler-1085, located approximately 4450.5 light-years (1364.53 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.3371% across the stellar disk), this world measures 7.22 Earth radii (0.64 Jupiter radii) and has a measured mass of 41.2 Earth masses (0.13 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.6 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.79 g⊕ (7.75 m/s²), and an escape velocity of 26.7 km/s.
In its orbital architecture around Kepler-1085, Kepler-1085 b completes one full revolution every 219.322 Earth days at a semi-major axis of 0.73361 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 36.4 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 7.220 R⊕, Kepler-1085 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 Kepler-1085 is classified as a stellar host with an effective photospheric temperature of 6,000 K, a radius of 1.14 R☉, a mass of 1.11 M☉, an estimated bolometric luminosity of 1.511 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.39 Gyr and a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, Kepler-1085 shines at apparent V-band magnitude 15.273 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1085 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1085 b sharing its stellar neighborhood alongside Kepler-1085 c.
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: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-1085 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,000 K |
| Stellar Radius | 1.1400 R☉ |
| Stellar Mass | 1.1100 M☉ |
| Bolometric Luminosity | 1.511 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | 3.390 Gyr |
| Apparent Magnitude | V: 15.273 · G: 15.247 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.733610 AU |
| Orbital Period | 219.322 days |
| Mean Orbital Velocity | 36.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9000° |
| Mean Bulk Density | 0.6 g/cm³ (26.7 km/s vesc) |
| Insolation Flux | 2.0550 S⊕ (~2,797 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4450.500 LY (1364.530 pc) |